WO2025059886A1 - Resource utilization method for iron-aluminum slag and nickel laterite ore acid leaching residue - Google Patents

Abstract

Disclosed is a resource utilization method for iron-aluminum slag and nickel laterite ore acid leaching residue, belonging to the technical field of resource recovery and reuse. In the method, ternary solid waste iron-aluminum slag is processed using a suspension roasting pre-reduction pyrogenic method; after initial drying, and by means of a suspension roasting pre-reduction furnace, the iron-aluminum slag is further dried to remove water of crystallization and is pre-reduced, and valuable metals such as Ni and Co are enriched. The method has high pre-reduction efficiency and low production costs, is environmentally friendly, and the entire process is highly operable and produces little ferronickel slag. The ferronickel and nickel pig iron prepared and obtained via the present method have high nickel and iron content, and the ferronickel and nickel pig iron of the present invention have a high Ni, Co, and Fe direct recovery rate.

Description

A method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching slag Technical Field

The present invention relates to the technical field of resource recovery and reuse, and in particular to a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching slag.

Background Art

With the continuous rise in the price of battery raw materials and the generation of a large number of waste batteries, the recycling value of waste ternary lithium batteries continues to increase. In the process of recycling and extracting valuable metals such as nickel, cobalt, and lithium from ternary waste batteries, a large amount of iron-aluminum slag will be produced. The later stage of ternary waste battery recycling process mainly produces sodium-based iron-aluminum slag. The iron-aluminum slag has a large amount of slag and carries the most metals, mainly nickel, cobalt, manganese, iron, and aluminum, and they are all valuable metal elements. Nickel, cobalt, and manganese mainly exist in the form of hydroxides, while iron and aluminum exist in the form of yellow sodium iron alum NaFe ₃ (SO ₄ ) ₂ (OH) ₆ and sodium alum NaAl ₃ (SO ₄ )(OH) ₆ , which have high recycling value. At present, this process cannot be replaced.

Although there are some studies on resource utilization and high value of ferroaluminum slag, they are only limited to aluminum extraction and have no industrial application. As environmental protection becomes more and more stringent, ferroaluminum slag is basically treated as general solid waste. As solid waste containing a large amount of valuable metals, ferroaluminum slag has not realized its due value. Therefore, it is urgent to develop a resource utilization technology for ternary ferroaluminum slag to turn waste into treasure.

According to the composition of ternary iron-aluminum slag, there are mainly iron, aluminum, nickel, cobalt, manganese, copper, sulfur, sodium, phosphorus, fluorine, etc. In theory, these elements can be recycled as battery materials, but from the value and content of the elements, iron, aluminum, nickel, cobalt, copper, sulfur, and sodium have certain recycling value. According to the smelting process of these metals, it is planned to adopt a combined smelting process of wet method + fire method to extract the above valuable metals. Research and develop a ternary iron-aluminum slag resource utilization process of "ternary iron-aluminum slag → drying → crushing → suspended roasting pre-reduction → roasting sand → electric furnace smelting → nickel iron to prepare iron phosphate, nickel iron slag + laterite nickel ore acid leaching slag → electric arc furnace smelting → nickel pig iron sold for steelmaking/electric furnace slag sold for sale".

CN105506290A discloses a method for comprehensive utilization of iron-aluminum slag, which selectively leaches the iron-aluminum slag to dissolve nickel, cobalt and aluminum in the slag; then, sodium sulfide is added to the nickel, cobalt and aluminum leaching solution to precipitate and recover the nickel and cobalt in the solution to obtain a crude aluminum sulfate solution; an oxidant and sodium hydroxide are added to the crude aluminum sulfate solution to remove iron therein, and then sodium sulfate salt is added to prepare the solution into sulfur production process. The original solution of sodium aluminum sulfate is evaporated and crystallized to obtain the sodium aluminum sulfate product. This process adopts a full wet process to treat the iron-aluminum slag. The iron-aluminum slag first selectively leaches nickel, cobalt and aluminum, then adds sodium sulfide precipitation to recover nickel and cobalt, and then introduces an oxidant and sodium hydroxide to remove iron, and then adds sodium sulfate salt to obtain the sodium aluminum sulfate product. The process is long and the cost is high. The wet slag produced at the end is still solid waste or even hazardous waste. The full pyrometallurgical process of the present invention treats the iron-aluminum slag. The process is completely different. The iron-aluminum slag is first dried and suspended for pre-reduction by roasting, and then directly uses pyrometallurgical reduction smelting to extract nickel, cobalt, iron and copper to obtain nickel iron and nickel pig iron products. The nickel iron product enters the iron phosphate production line to prepare iron phosphate. The process is novel, the recovery rate of valuable metals is high, and the economic benefits are better.

CN114317991A discloses a method for recovering valuable metals by carbon-free smelting of hazardous iron and aluminum waste slag and wet desulfurization slag. The invention comprises the following steps: (1) carbon-free reduction roasting in a rotary kiln: the mass percentage of hazardous iron and aluminum waste slag, wet desulfurization slag, hematite or magnetite in the rotary kiln is 100:1-6:1-4; (2) electric furnace reduction smelting: adding roasted sand evenly into the electric furnace for reduction; (3) rapid cooling and grinding of aluminum-containing slag: cooling at a cooling rate of 1200-1300℃/min, and the grinding particle size is 450-480 mesh. The method for recovering valuable metals by carbon-free smelting of hazardous iron and aluminum waste slag and wet desulfurization slag adopted in the invention has the advantages of easy process control, simple operation, strong process adaptability, and can make the recovery rate of nickel, cobalt and copper in the iron and aluminum slag reach more than 98%, and can realize the preparation of slag micro powder from the reduction slag, achieving the purpose of resource utilization of hazardous waste, and having good social and economic benefits. However, the process of the invention cannot process low-grade iron-aluminum slag, and the product quality is poor and the impurities are high. The process of the present invention adopts suspended pre-reduction roasting and adopts reducing gas as the reducing agent, while the reducing agent for high-temperature reduction smelting in electric furnaces and electric arc furnaces is graphite slag, graphite tailings, blue carbon or anthracite. In addition to limestone and quartz sand, the flux of the electric arc furnace also includes nickel-iron slag, and low-grade iron-aluminum slag can be processed, and the output product quality is better.

CN113789447A discloses a method for recovering nickel in iron-aluminum slag obtained by leaching battery powder. The invention discloses a method for recovering nickel in iron-aluminum slag obtained by leaching battery powder. First, sulfuric acid solution is added to the iron-aluminum slag to dissolve to obtain sulfate solution, then an oxidant is added, ammonia and carbonate are added to the oxidized sulfate solution, pH is adjusted to 1.0-3.2 for reaction, iron hydroxide precipitation is separated to obtain iron-removed liquid, carbonate is added to the iron-removed liquid, pH is adjusted to 3.2-5.5 for reaction, aluminum hydroxide precipitation is separated to obtain aluminum-removed liquid, ammonia is added to the aluminum-removed liquid, pH is adjusted to 7.0-8.8 for reaction, nickel complex is obtained by washing and impurity removal, and an oxidant is added to the nickel complex to break the complex to obtain a nickel-containing solution. The method well realizes the efficient separation of iron, aluminum and nickel in iron-aluminum slag, improves the separation effect of iron, aluminum and nickel, reduces the loss of nickel, and improves the recovery rate of nickel, but the generated wet slag is still solid waste or hazardous waste and cannot be effectively treated. The present invention effectively extracts valuable metals such as nickel, cobalt, iron, aluminum and copper from the iron-aluminum slag through the full pyrolysis process. Hazardous solid wastes such as graphite slag, nickel iron slag, and laterite nickel ore acid leaching residue are solidified and sold after pyrometallurgical smelting.

In view of this, this article is proposed.

Summary of the invention

The purpose of this paper is to overcome the shortcomings of the existing technology and provide a resource utilization method for iron-aluminum slag and laterite nickel ore acid leaching residue. This paper adopts suspended roasting pre-reduction fire method to treat ternary solid waste iron-aluminum slag. The iron-aluminum slag is first dried, and then further dried and de-crystallized by a suspended roasting pre-reduction furnace, pre-reduced, and enriched with valuable metals such as Ni and Co. The pre-reduction efficiency is high, the production cost is low, and it is environmentally friendly. The whole process is highly operable and the amount of nickel-iron slag is small. The nickel and iron content of the nickel iron and nickel pig iron prepared in this paper is high, and the nickel iron and nickel pig iron Ni, Co, and Fe direct yields of this paper.

To achieve the above objectives, the technical solutions adopted in this paper are:

A method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching slag, comprising the following steps:

Drying the iron-aluminum slag, mixing the iron-aluminum slag with flux 1, and then grinding the slag to obtain a mixed material;

The mixed material and flux 2 are calcined and pre-reduced in a reducing atmosphere to obtain calcined sand;

Smelting roasted sand, flux 3 and reducing agent 1 to obtain ferronickel and ferronickel slag;

The nickel-ferronickel slag, laterite nickel ore acid leaching slag, flux 4 and reducing agent 2 are smelted to obtain nickel pig iron and electric furnace slag.

In one embodiment, the main components of the ferroaluminum slag are: 0.40-1.00wt% Ni, 0.10-0.40wt% Co, 10.00-30.00wt% Fe, 1.00-8.00wt% S, 0.50-1.00wt% Al, and 0.50-1.50wt% Na.

In one embodiment, the ferroaluminum slag is dried to a moisture content of ≤10wt%.

In one embodiment, drying is specifically as follows: the ferroaluminum slag is loaded into a hopper on the top of the kiln for standby use. When feeding, the ferroaluminum slag enters a dehydrator from the hopper for dehydration, and after dehydration, it is put into a rotary drum dryer through a conveying auger; a gas generator is used to provide heat to the drying kiln to dry and remove free water and part of the adsorbed water; during the drying process, the moisture on the surface of the ferroaluminum slag diffuses from the surface to the surrounding medium in the form of water vapor, and when the surface moisture evaporates, a humidity gradient is formed inside and on the surface of the ferroaluminum slag, so that the moisture inside the ferroaluminum slag migrates along the gap to the surface for evaporation and removal; after drying, the ferroaluminum slag is discharged through a cyclone discharger and a discharging auger and stored in a storage bin. The water content of the iron-aluminum slag is 30-60wt%; the capacity of the kiln top silo is 5-10t; the water content of the material after dehydration by the dehydrator is 25-50%; the feeding rate of the conveying auger is 10-20t/h; the fuel of the gas generator is one of coal gas, natural gas and hydrogen; the furnace temperature of the rotary drum dryer is 100-800℃; The diameter and length of the rotary drum dryer are 2m and 20m respectively; the feed rate of the rotary drum dryer is 5-20t/h; the discharge rate of the discharge auger is 1-20t/h; the moisture content of the iron-aluminum slag after drying is ≤10wt%, and the particle size is 2-10mm.

In one embodiment, the grinding process is performed to a particle size of less than 2 mm.

In one embodiment, the mass ratio of the iron-aluminum slag to the flux 1 is 1:(0.01-0.05).

In one embodiment, the mass ratio of the mixed material to the flux 2 is 1:(0.01-0.08).

In one embodiment, the temperature of the calcination pre-reduction is 700-1080° C. and the time is 10-50 min.

In one embodiment, the mixed material and flux 2 are roasted and pre-reduced in a reducing atmosphere. Specifically, the mixed material is put into a suspension roasting pre-reduction furnace for roasting and pre-reduction, flux 2 is put into the furnace to adjust the slag shape, 100-1000Nm ³ /h of fuel is introduced for combustion and heat supply, 50-300Nm ³ /h of reducing gas is introduced for pre-reduction of iron-aluminum slag, the reduction roasting temperature is 700-1080°C, the roasting time is 10-50min, and the prepared roasted sand is directly put into an electric furnace for reduction smelting, or transported to a roasted sand silo for storage. The fuel is one of pulverized coal, natural gas, heavy oil or coal gas; the reducing gas is carbon monoxide or hydrogen.

In one embodiment, the main components of the roasted sand are: 1.50-3.60wt% Ni, 0.35-0.68wt% Co, 30.00-50.00wt% Fe, 0.50-2.10wt% Mn, 1.00-3.00wt% Al, and 1.00-2.00wt% Na.

In one embodiment, the mass ratio of the roasted sand, the flux 3, and the reducing agent 1 is 1: (0.01-0.05): (0.03-0.1).

In one embodiment, when the roasted sand, flux 3 and reducing agent 1 are smelted, the smelting temperature is 1400-1550° C. and the smelting time is 15-60 min.

In one embodiment, roasted sand, flux 3, and reducing agent 1 are melted as follows: roasted sand is put into a 3000KVA electric furnace, and flux 3 and reducing agent 1 are added. Heat required for reduction smelting is generated by arc generated by contact between electrodes and slag and current passes through roasted sand and slag, that is, heat is generated inside the charge, so roasted sand is melted by heat and chemical reaction is carried out inside roasted sand. Therefore, smelting in the electric furnace is a simultaneous reduction reaction and slag formation. The slag near the electrode has a lower density due to the increase in temperature and the presence of gas generated by the reaction in the slag. It floats up along the electrode, and diffuses horizontally around after reaching the surface, while the lower temperature charge absorbs the heat of the superheated slag and melts. The melted roasted sand and the cooled slag are mixed together, and sink due to the increase in density. When it falls to the depth of electrode insertion, a part of it moves horizontally toward the electrode and becomes part of the continuous cycle, while the other part continues to settle to the end of the pile and moves horizontally along the lower molten surface of the roasted sand. In this way, most of the melt falls down into the relatively calm slag layer at the bottom, and the slag and nickel iron are separated. The reaction temperature is 1400-1550℃, the high temperature smelting time is 15-60min, and the reaction Ferronickel, ferronickel slag and flue gas should be generated. The electric furnace slag and laterite nickel ore acid leaching slag are compounded to prepare nickel pig iron. The flue gas is used to dry the ferroaluminum slag raw material after desulfurization and denitrification to meet the standards. The ferronickel enters the acid leaching process to prepare iron phosphate.

In one embodiment, the main components of the nickel-iron are: 10.00-35.00wt% Ni, 2.50-5.00wt% Co, 60.00-80.00wt% Fe, 0.10-0.60wt% S, 1.50-3.00wt% C; and/or

The main components of the nickel-iron slag are: 0.01-0.25wt% Ni, 0.001-0.01wt% Co, 10.00-30.00wt% Fe, 5.00-20.00wt% Si, 2.00-8.00wt% Ca, 2.00-10.00wt% Al, 0.50-2.50wt% Mn, 0.10-0.60wt% Mg, and 0.01-0.13wt% Cr.

In one embodiment, the main components of the laterite nickel ore acid leaching residue are: 0.05-0.75wt% Ni, 0.0001-0.001wt% Co, 40.00-57.00wt% Fe, 4.00-12.00wt% Si, 0.10-1.00wt% Ca, 1.00-5.00wt% Al, 0.10-0.60wt% Mn, 0.10-1.00wt% Mg, and 0.50-1.20wt% Cr.

In one embodiment, the mass ratio of the nickel-iron slag, the laterite nickel ore acid leaching residue, the flux 4, and the reducing agent 2 is 1: (1-3): (0.01-0.03): (0.04-0.11).

In one embodiment, when ferronickel slag, laterite nickel ore acid leaching slag, flux 4, and reducing agent 2 are smelted, the smelting temperature is 1450-1600° C. and the smelting time is 20-60 min.

In one embodiment, ferronickel slag, laterite nickel acid leaching slag, flux 4, and reducing agent 2 are smelted specifically as follows: electric furnace slag and laterite nickel acid leaching slag are compounded in an electric arc furnace for smelting: ferronickel slag is used as an iron-enhancing agent or flux, and is mixed with laterite nickel acid leaching slag in a ratio of (1:1-3), and flux 4 and reducing agent 2 are added; electric energy is used as the main energy source, and the electric energy is discharged and arced through graphite electrodes and charge materials to generate a high temperature of more than 2000°C to 6000°C, and the electric furnace slag and acid leaching slag raw materials are melted by arc radiation, temperature convection and heat conduction; in addition, electric heating can easily and accurately control the furnace temperature to 1450°C to 1600°C, and the heating operation is carried out under reducing atmosphere and normal pressure according to the process requirements, and the reaction time is controlled to be 20min to 60min, and nickel pig iron, electric furnace slag and flue gas are directly reacted to produce. Nickel pig iron is sold directly for steelmaking, electric furnace slag is sold for the preparation of cement, roadbed materials, etc., and the flue gas is used to dry iron and aluminum slag raw materials after being treated by the denitrification and desulfurization system.

In one embodiment, the nickel pig iron mainly comprises: 1.00-3.00wt% Ni, 0.01-0.05wt% Co, 80.00-96.00wt% Fe, 0.10-0.80wt% S, 1.00-3.00wt% C, 1.00-3.50wt% Cr, 0.05-0.25wt% Mn, 0.10-0.32wt% P; and/or

The electric furnace slag mainly comprises: 0.01-0.03wt% Ni, 0.0001-0.001wt% Co, 5.00-30.00wt% Fe, 5.00-20.00wt% Si, 10.00-25.00wt% Ca, 3.00-10.00wt% Al, 0.10-1.50wt% Mn, 1.00-5.00wt% Mg, and 0.05-1.00wt% Cr.

In one embodiment, the flux 1, flux 2, flux 3, and flux 4 are each independently selected from lime. At least one of stone, quartz sand, bauxite, and iron block; and/or

The reducing agent 1 and the reducing agent 2 are each independently selected from at least one of graphite slag, anthracite, and graphite anode residues.

The beneficial effects of this paper are as follows: (1) This paper adopts the suspended roasting pre-reduction fire method to treat ternary solid waste iron-aluminum slag. After the iron-aluminum slag is dried, it is further dried and dehydrated by a suspended roasting pre-reduction furnace, and pre-reduced to enrich valuable metals such as Ni and Co. Since the reducing agent is a gas, the gas-solid reaction is relatively fast and sufficient, so the pre-reduction efficiency is high, the production cost is low, the environment is very friendly, and the whole process is highly operable. The roasted sand is reduced and smelted in an electric furnace to produce nickel iron, the product direct yield is high, the flue gas volume is small, the process is simple, and the amount of nickel iron slag is small. (2) This paper uses solid waste residues such as ternary iron-aluminum slag, nickel iron slag and laterite nickel ore acid leaching residue as raw materials, nickel iron slag and waste quartz sand as flux, and graphite slag solid waste produced in the battery recycling process as a reducing agent, turning waste into treasure, with good economic efficiency and green environmental protection. The flue gas is used to dry the iron-aluminum slag raw materials, saving energy consumption, and the electric furnace slag can be sold for use as building materials, solving the problem of open circuit of waste residues. (3) The wet leaching slag produced by the existing wet process of iron-aluminum slag contains a large amount of heavy metal ions such as nickel, manganese, and copper, which are harmful to human health and damage the ecological environment. This process can solidify the heavy metals at high temperature, so that the toxicity and corrosiveness of the electric furnace slag meet the national standards; (4) The nickel and iron contents of the nickel iron and nickel pig iron prepared in this paper are high, and the nickel iron and nickel pig iron Ni, Co, and Fe direct recovery rates are high.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flow chart of the resource utilization method of iron-aluminum slag and laterite-nickel ore acid leaching slag in this article.

DETAILED DESCRIPTION

In order to make the purpose, technical solutions and advantages of the embodiments of this article clearer, the technical solutions in the embodiments of this article will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this article, not all of the embodiments. Based on the embodiments of this article, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this article.

Unless otherwise specified, the experimental reagents and instruments involved in the implementation of this article are commonly used reagents and instruments.

In this article, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

In this article, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are considered continuous and include the minimum and maximum values of the range, as well as every value between the minimum and maximum values. Furthermore, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein are understood to include any and all subranges subsumed therein.

Example 1

Please refer to FIG1 . This embodiment provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching slag, comprising the following steps:

(1) Drying of iron-aluminum slag: 1 t of iron-aluminum slag is loaded into the hopper on the top of the kiln for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration, and is then put into the rotary drum dryer through the conveying auger. A gas generator is used to provide heat to the drying kiln to dry and remove free water and part of the adsorbed water.

Among them, the water content of the ferroaluminum slag is 30wt%; the capacity of the kiln top silo is 5t; the water content of the material after dehydration by the dehydrator is 25%; the feeding rate of the conveying auger is 10t/h; the fuel of the gas generator is natural gas; the furnace temperature of the rotary drum dryer is 100°C; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 5t/h; the discharging auger discharging rate is 10t/h; the water content of the ferroaluminum slag after drying is 10wt%, and the particle size is 2mm; the main components of the ferroaluminum slag are Ni 0.40wt%, Co 0.10wt%, Fe 10.00wt%, S 1.00wt%, Al 0.50wt%, and Na 0.50wt%.

(2) Grinding ingredients: The dried iron-aluminum slag is mixed with the solvent in a ratio of 1:0.01 and ground. The particle size of the mixture after grinding is less than 2 mm.

Wherein, solvent 1 is limestone.

(3) Suspended roasting pre-reduction: 1 t of the mixed material is put into a suspended roasting pre-reduction furnace for roasting pre-reduction, and flux 2 (mass ratio to the mixed material is 0.01:1) is added to adjust the slag shape, 100 Nm ³ /h of combustion heat is introduced, and 50 Nm ³ /h of reducing gas is introduced to pre-reduce the iron-aluminum slag. The reduction roasting temperature is 700°C and the roasting time is 10 min to obtain roasted sand.

Among them, the flux 2 is limestone; the fuel is pulverized coal; the reducing gas is carbon monoxide; the main components of the roasted sand are Ni 1.50wt%, Co 0.35wt%, Fe 50.00wt%, Mn 2.10wt%, Al 3.00wt%, and Na 2.00wt%.

(4) Baked sand electric furnace smelting: 1 t of baked sand is put into a 3000KVA electric furnace, 1% flux 3 and 3% reducing agent 1 are added, the reaction temperature is 1400°C, the high temperature smelting time is 15 minutes, and the reaction generates nickel iron and electric furnace slag. and smoke;

Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

Among them, the main components of the nickel iron are: Ni 10.00wt%, Co 2.50wt%, Fe 80.00wt%, S 0.60wt%, C 3.00wt%; the main components of the nickel iron slag are: Ni 0.25wt%, Co 0.01wt%, Fe 10.00wt%, Si 10.00wt%, Ca 8.00wt%, Al 10.00wt%, Mn 2.50wt%, Mg 0.60wt%, Cr 0.13wt%; the flux 3 is limestone and quartz sand (mass ratio is 1:1); the reducing agent 1 is graphite slag.

(5) Electric arc furnace smelting of electric furnace slag and laterite nickel ore acid leaching residue: Electric furnace slag and laterite nickel ore acid leaching residue are mixed in a ratio of (1:1), and 1% flux 4 and 4% reducing agent 2 are added; the reaction is carried out at a furnace temperature of 1450°C, a reducing atmosphere, and normal pressure for 60 minutes to obtain nickel pig iron, electric furnace slag and flue gas.

The flux 4 is limestone; the reducing agent 2 is graphite slag.

The main components of the laterite nickel ore acid leaching residue are: Ni 0.05wt%, Co 0.0001wt%, Fe 57.00wt%, Si 12.00wt%, Ca 0.10wt%, Al 1.00wt%, Mn 0.10wt%, Mg 0.10wt%, Cr 0.50wt%;

The nickel pig iron mainly comprises: Ni 1.00wt%, Co 0.01wt%, Fe 96.00wt%, S 0.10wt%, C 1.00wt%, Cr 1.00wt%, Mn 0.05wt%, P 0.10wt%;

The main components of the electric furnace slag are: Ni 0.01wt%, Co 0.0001wt%, Fe 5.00wt%, Si 5.00wt%, Ca 10.00wt%, Al 10.00wt%, Mn 1.50wt%, Mg 5.00wt%, Cr 1.00wt%.

Example 2

Please refer to FIG1 . This embodiment provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching slag, comprising the following steps:

(1) Drying of iron-aluminum slag: 5 tons of iron-aluminum slag is loaded into the hopper on the top of the kiln for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration, and is put into the rotary drum dryer through the conveying auger; a gas generator is used to provide heat to the drying kiln to dry and remove free water and part of the adsorbed water.

The water content of the iron-aluminum slag is 60wt%; the capacity of the kiln top silo is 5t; the water content of the material after dehydration by the dehydrator is 50%; the feeding rate of the conveying auger is 20t/h; the fuel of the gas generator is natural gas; the furnace temperature of the rotary drum dryer is 800℃; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 5t/h; the discharging auger discharges the material The rate is 10t/h; the water content of the ferroaluminum slag after drying is 9wt% and the particle size is 10mm; the main components of the ferroaluminum slag are Ni 1.00wt%, Co 0.40wt%, Fe 10.00wt%, S 8.00wt%, Al 1.00wt%, and Na 1.50wt%.

(2) Grinding ingredients: The dried iron-aluminum slag is mixed with the solvent in a ratio of 1:0.05 and ground. The particle size of the mixture after grinding is less than 2 mm.

Wherein, solvent 1 is quartz sand.

(3) Suspended roasting pre-reduction: 5 tons of the mixed material was put into a suspended roasting pre-reduction furnace for roasting pre-reduction. Flux 2 (mass ratio to the mixed material 0.08:1) was added to adjust the slag shape. 100 Nm ³ /h of combustion heat was introduced, and 300 Nm ³ /h of reducing gas was introduced to pre-reduce the iron-aluminum slag. The reduction roasting temperature was 1080°C and the roasting time was 50 min to obtain roasted sand.

Among them, the flux 2 is lime sand; the fuel is natural gas; the reducing gas is carbon monoxide; the main components of the roasted sand are Ni 3.60wt%, Co 0.68wt%, Fe 30.00wt%, Mn 0.50wt%, Al 1.00wt%, and Na 1.00wt%.

(4) Baked sand electric furnace smelting: 5 tons of baked sand is put into a 3000KVA electric furnace, 5% of flux 3 and 10% of reducing agent 1 are added, the reaction temperature is 1550°C, the high temperature smelting time is 60 minutes, and the reaction generates nickel iron, electric furnace slag and flue gas;

Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

Wherein, the main components of the nickel-iron are: Ni 35.00wt%, Co 5.00wt%, Fe 60.00wt%, S 0.10wt%, C 1.50wt%;

The main components of the nickel-iron slag are: Ni 0.01wt%, Co 0.001wt%, Fe 30.00wt%, Si 20.00wt%, Ca 2.00wt%, Al 2.00wt%, Mn 0.50wt%, Mg 0.10wt%, Cr 0.01wt%; the flux 3 is quartz sand and iron block (mass ratio 1:1); the reducing agent 1 is anthracite.

(5) Electric arc furnace smelting of electric furnace slag and laterite nickel ore acid leaching residue: Electric furnace slag and laterite nickel ore acid leaching residue are mixed in a ratio of (1:3), and 3% flux 4 and 11% reducing agent 2 are added; the reaction is carried out at a furnace temperature of 1600°C, a reducing atmosphere, and normal pressure for 20 minutes to obtain nickel pig iron, electric furnace slag and flue gas.

The flux 4 is quartz sand; the reducing agent 5 is anthracite.

The main components of the laterite nickel ore acid leaching residue are: Ni 0.75wt%, Co 0.001wt%, Fe 40.00wt%, Si 12.00wt%, Ca 1.00wt%, Al 5.00wt%, Mn 0.60wt%, Mg 1.00wt%, Cr 1.20wt%;

The nickel pig iron mainly comprises: Ni 3.00wt%, Co 0.05wt%, Fe 80.00wt%, S 0.80wt%, C 3.00wt%, Cr 3.50wt%, Mn 0.25wt%, P 0.32wt%;

The main components of the electric furnace slag are: Ni 0.03wt%, Co 0.001wt%, Fe 30.00wt%, Si 20.00wt%, Ca 25.00wt%, Al 10.00wt%, Mn 0.10wt%, Mg 1.00wt%, and Cr 0.05wt%.

Example 3

Please refer to FIG1 . This embodiment provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching slag, comprising the following steps:

(1) Drying of iron-aluminum slag: 3 tons of iron-aluminum slag is loaded into the hopper on the top of the kiln for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration, and is put into the rotary drum dryer through the conveying auger; a gas generator is used to provide heat to the drying kiln to dry and remove free water and part of the adsorbed water.

Among them, the water content of the ferroaluminum slag is 40wt%; the capacity of the kiln top silo is 8t; the water content of the material after dehydration by the dehydrator is 35%; the feeding rate of the conveying auger is 15t/h; the fuel of the gas generator is natural gas; the furnace temperature of the rotary drum dryer is 700℃; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 15t/h; the discharging auger discharging rate is 10t/h; the water content of the ferroaluminum slag after drying is 8wt%, and the particle size is 6mm; the main components of the ferroaluminum slag are Ni 0.86wt%, Co 0.30wt%, Fe 20.50wt%, S 5.50wt%, Al 0.76wt%, and Na 1.03wt%.

(2) Grinding ingredients: The dried iron-aluminum slag is mixed with the solvent in a ratio of 1:0.03 and ground. The particle size of the mixture after grinding is less than 2 mm.

Wherein, solvent 1 is bauxite.

(3) Suspended roasting pre-reduction: 3 tons of the mixed material was put into a suspended roasting pre-reduction furnace for roasting pre-reduction. Flux 2 (mass ratio to the mixed material was 0.05:1) was added to adjust the slag shape. 600 Nm ³ /h of combustion heat was introduced, and 200 Nm ³ /h of reducing gas was introduced to pre-reduce the iron-aluminum slag. The reduction roasting temperature was 900°C and the roasting time was 30 min to obtain roasted sand.

Among them, the flux 2 is bauxite; the fuel is heavy oil; the reducing gas is carbon monoxide; the main components of the roasted sand are Ni 2.50wt%, Co 0.50wt%, Fe 40.00wt%, Mn 1.35wt%, Al 2.00wt%, and Na 1.50wt%.

(4) Baked sand electric furnace smelting: 3 tons of baked sand is put into a 3000KVA electric furnace, 3% flux 3 and 7% reducing agent 1 are added, the reaction temperature is 1480℃, the high temperature smelting time is 40min, and the reaction generates nickel iron and electric furnace slag. and smoke;

Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

Wherein, the main components of the nickel-iron are: Ni 25.00wt%, Co 3.50wt%, Fe 70.00wt%, S 0.40wt%, C 2.50wt%;

The main components of the nickel-iron slag are: Ni 0.10wt%, Co 0.008wt%, Fe 25.00wt%, Si 10.00wt%, Ca 6.00wt%, Al 5.00wt%, Mn 1.50wt%, Mg 0.35wt%, Cr 0.10wt%; the flux 3 is quartz stone and bauxite (mass ratio 1:1); the reducing agent 1 is graphite slag and graphite residual electrode (mass ratio 1:1).

(5) Electric arc furnace smelting of electric furnace slag and laterite nickel ore acid leaching residue: Electric furnace slag and laterite nickel ore acid leaching residue are mixed in a ratio of (1:2), and 2% flux 4 and 8% reducing agent 2 are added; the reaction is carried out at a furnace temperature of 1550°C, a reducing atmosphere, and normal pressure for 35 minutes to obtain nickel pig iron, electric furnace slag and flue gas.

The flux 3 is bauxite; the reducing agent 2 is graphite slag.

The main components of the laterite nickel ore acid leaching residue are: Ni 0.55wt%, Co 0.0008wt%, Fe 54.23wt%, Si 8.94wt%, Ca 0.76wt%, Al 4.12wt%, Mn 0.46wt%, Mg 0.66wt%, Cr 0.93wt%;

The main components of the nickel pig iron are: Ni 2.43wt%, Co 0.03wt%, Fe 90.43wt%, S 0.57wt%, C 2.46wt%, Cr 2.87wt%, Mn 0.13wt%, P 0.10wt%;

The main components of the electric furnace slag are: Ni 0.02wt%, Co 0.0007wt%, Fe 25.21wt%, Si 15.43wt%, Ca 20.47wt%, Al 6.67wt%, Mn 0.11wt%, Mg 4.38wt%, and Cr 0.13wt%.

Comparative Example 1

The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 is not subjected to pre-reduction treatment, and the other aspects are the same.

This comparative example provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching slag, comprising the following steps:

(1) Drying of iron-aluminum slag: 1 t of iron-aluminum slag is loaded into the hopper on the top of the kiln for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration, and is then put into the rotary drum dryer through the conveying auger. A gas generator is used to provide heat to the drying kiln to dry and remove free water and part of the adsorbed water.

The iron-aluminum slag contains 30wt% water; the kiln top silo has a capacity of 5t; the dehydrator dehydrates The moisture content of the material after drying is 25%; the feeding rate of the conveying auger is 10t/h; the fuel of the gasifier is natural gas; the furnace temperature of the rotary drum dryer is 100°C; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 5t/h; the discharging rate of the discharging auger is 10t/h; the moisture content of the iron-aluminum slag after drying is 10wt%, and the particle size is 2mm; the main components of the iron-aluminum slag are Ni 0.40wt%, Co 0.10wt%, Fe 10.00wt%, S 1.00wt%, Al 0.50wt%, and Na 0.50wt%.

(2) Grinding ingredients: The dried iron-aluminum slag is mixed with the solvent in a ratio of 1:0.01 and ground. The particle size of the mixture after grinding is less than 2 mm.

Wherein, solvent 1 is limestone.

(3) Suspension roasting pre-reduction: 1 t of the mixed material is subjected to electric furnace smelting: 1 t of the mixed material is put into a 3000KVA electric furnace, 1% flux 3 and 3% reducing agent 1 are added, the reaction temperature is 1400° C., the high temperature smelting time is 15 min, and the reaction generates nickel iron, electric furnace slag and flue gas;

Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

Wherein, the main components of the nickel iron are: 9.23wt% Ni, 0.96wt% Co, 87.24wt% Fe, 1.57wt% S, 1.00wt% C;

The flux 3 is limestone and quartz sand (mass ratio is 1:1); the reducing agent 1 is graphite slag.

(4) Electric arc furnace smelting of electric furnace slag and laterite nickel ore acid leaching residue: Electric furnace slag and laterite nickel ore acid leaching residue are mixed in a ratio of (1:1), and 1% flux 4 and 4% reducing agent 2 are added; the reaction is carried out at a furnace temperature of 1450°C, a reducing atmosphere, and normal pressure for 60 minutes to obtain nickel pig iron, electric furnace slag and flue gas.

The flux 4 is limestone; the reducing agent 2 is graphite slag.

The main components of the laterite nickel ore acid leaching residue are: Ni 0.05wt%, Co 0.0001wt%, Fe 57.00wt%, Si 12.00wt%, Ca 0.10wt%, Al 1.00wt%, Mn 0.10wt%, Mg 0.10wt%, Cr 0.50wt%;

The nickel pig iron mainly comprises: 0.85wt% Ni, 0.009wt% Co, 92.25wt% Fe, 1.43wt% S, 1.87wt% C, 2.51wt% Cr, 0.18wt% Mn, and 0.35wt% P;

The electric furnace slag mainly comprises: 0.05wt% Ni, 0.003wt% Co, 36.78wt% Fe, 13.64wt% Si, 15.52wt% Ca, 11.57wt% Al, 1.66wt% Mn, 3.87wt% Mg, and 0.81wt% Cr.

Comparative Example 2

The difference between Comparative Example 2 and Example 1 is that no laterite nickel ore acid leaching residue is added in step (5) of Comparative Example 2, and the other parts are the same.

This comparative example provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching slag, comprising the following steps:

(1) Drying of iron-aluminum slag: 1 t of iron-aluminum slag is loaded into the hopper on the top of the kiln for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration, and is then put into the rotary drum dryer through the conveying auger. A gas generator is used to provide heat to the drying kiln to dry and remove free water and part of the adsorbed water.

Among them, the water content of the ferroaluminum slag is 30wt%; the capacity of the kiln top silo is 5t; the water content of the material after dehydration by the dehydrator is 25%; the feeding rate of the conveying auger is 10t/h; the fuel of the gas generator is natural gas; the furnace temperature of the rotary drum dryer is 100°C; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 5t/h; the discharging auger discharging rate is 10t/h; the water content of the ferroaluminum slag after drying is 10wt%, and the particle size is 2mm; the main components of the ferroaluminum slag are Ni 0.40wt%, Co 0.10wt%, Fe 10.00wt%, S 1.00wt%, Al 0.50wt%, and Na 0.50wt%.

(2) Grinding ingredients: The dried iron-aluminum slag is mixed with the solvent in a ratio of 1:0.01 and ground. The particle size of the mixture after grinding is less than 2 mm.

Wherein, solvent 1 is limestone.

(3) Suspended roasting pre-reduction: 1 t of the mixed material is put into a suspended roasting pre-reduction furnace for roasting pre-reduction, and flux 2 (mass ratio to the mixed material is 0.01:1) is added to adjust the slag shape, 100 Nm ³ /h of combustion heat is introduced, and 50 Nm ³ /h of reducing gas is introduced to pre-reduce the iron-aluminum slag. The reduction roasting temperature is 700°C and the roasting time is 10 min to obtain roasted sand.

Among them, the flux 2 is limestone; the fuel is pulverized coal; the reducing gas is carbon monoxide; the main components of the roasted sand are Ni 1.50wt%, Co 0.35wt%, Fe 50.00wt%, Mn 2.10wt%, Al 3.00wt%, and Na 2.00wt%.

(4) Baked sand electric furnace smelting: 1 t of baked sand is put into a 3000KVA electric furnace, 1% flux 3 and 3% reducing agent 1 are added, the reaction temperature is 1400°C, the high temperature smelting time is 15 minutes, and the reaction generates nickel iron, electric furnace slag and flue gas;

Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

The main components of the nickel-iron are: Ni 10.00wt%, Co 2.50wt%, Fe 80.00wt%, S 0.60wt%, C 3.00wt%; the main components of the nickel-iron slag are: Ni 0.25wt%, Co 0.01wt%, Fe 10.00wt%, Si 10.00wt%, Ca 8.00wt%, Al 10.00wt%, Mn 2.50wt%, Mg 0.60wt%, Cr 0.13wt%; the flux 3 is limestone and quartz sand (mass ratio is 1:1); the reducing agent 1 is graphite slag.

(5) Smelting the electric slag in an electric arc furnace: The electric slag is added to an electric arc furnace, and 1% flux 4 and 4% reducing agent 2 are added; the reaction is carried out at a furnace temperature of 1450° C., a reducing atmosphere, and normal pressure for 60 minutes to obtain nickel pig iron, electric slag, and flue gas.

The flux 4 is limestone; the reducing agent 2 is graphite slag.

The nickel pig iron mainly comprises: 0.51wt% Ni, 0.004wt% Co, 93.67wt% Fe, 1.32wt% S, 3.64wt% C, 0.91wt% Cr, 0.33wt% Mn, and 0.41wt% P;

The electric furnace slag mainly comprises: 0.05wt% Ni, 0.002wt% Co, 33.24wt% Fe, 21.47wt% Si, 17.83wt% Ca, 11.51wt% Al, 1.76wt% Mn, 0.87wt% Mg, and 0.43wt% Cr.

Comparative Example 3

The difference between Comparative Example 3 and Example 1 is that nickel-ferronickel slag is not added in step (5) of Comparative Example 2, and the other steps are the same.

This comparative example provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching slag, comprising the following steps:

(1) Drying of iron-aluminum slag: 1 t of iron-aluminum slag is loaded into the hopper on the top of the kiln for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration, and is then put into the rotary drum dryer through the conveying auger. A gas generator is used to provide heat to the drying kiln to dry and remove free water and part of the adsorbed water.

Among them, the water content of the ferroaluminum slag is 30wt%; the capacity of the kiln top silo is 5t; the water content of the material after dehydration by the dehydrator is 25%; the feeding rate of the conveying auger is 10t/h; the fuel of the gas generator is natural gas; the furnace temperature of the rotary drum dryer is 100°C; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 5t/h; the discharging auger discharging rate is 10t/h; the water content of the ferroaluminum slag after drying is 10wt%, and the particle size is 2mm; the main components of the ferroaluminum slag are Ni 0.40wt%, Co 0.10wt%, Fe 10.00wt%, S 1.00wt%, Al 0.50wt%, and Na 0.50wt%.

(2) Grinding ingredients: The dried iron-aluminum slag is mixed with the solvent in a ratio of 1:0.01 and ground. The particle size of the mixture after grinding is less than 2 mm.

Wherein, solvent 1 is limestone.

(3) Suspended roasting pre-reduction: 1 t of the mixed material is put into a suspended roasting pre-reduction furnace for roasting pre-reduction, and flux 2 (mass ratio to the mixed material is 0.01:1) is added to adjust the slag shape, 100 Nm ³ /h of combustion heat is introduced, and 50 Nm ³ /h of reducing gas is introduced to pre-reduce the iron-aluminum slag. The reduction roasting temperature is 700°C and the roasting time is 10 min to obtain roasted sand.

Among them, the flux 2 is limestone; the fuel is pulverized coal; the reducing gas is carbon monoxide; the main components of the roasted sand are Ni 1.50wt%, Co 0.35wt%, Fe 50.00wt%, Mn 2.10wt%, Al 3.00wt%, and Na 2.00wt%.

(4) Baked sand electric furnace smelting: 1 t of baked sand is put into a 3000KVA electric furnace, 1% flux 3 and 3% reducing agent 1 are added, the reaction temperature is 1400°C, the high temperature smelting time is 15 minutes, and the reaction generates nickel iron, electric furnace slag and flue gas;

Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

Among them, the main components of the nickel iron are: Ni 10.00wt%, Co 2.50wt%, Fe 80.00wt%, S 0.60wt%, C 3.00wt%; the main components of the nickel iron slag are: Ni 0.25wt%, Co 0.01wt%, Fe 10.00wt%, Si 10.00wt%, Ca 8.00wt%, Al 10.00wt%, Mn 2.50wt%, Mg 0.60wt%, Cr 0.13wt%; the flux 3 is limestone and quartz sand (mass ratio is 1:1); the reducing agent 1 is graphite slag.

(5) Electric arc furnace smelting of laterite nickel ore acid leaching residue: 1% flux 4 and 4% reducing agent 2 are added to the laterite nickel ore acid leaching residue; the reaction is carried out for 60 minutes at a furnace temperature of 1450° C., a reducing atmosphere and normal pressure to obtain nickel pig iron, electric furnace slag and flue gas.

The flux 4 is limestone; the reducing agent 2 is graphite slag.

The main components of the laterite nickel ore acid leaching residue are: Ni 0.05wt%, Co 0.0001wt%, Fe 57.00wt%, Si 12.00wt%, Ca 0.10wt%, Al 1.00wt%, Mn 0.10wt%, Mg 0.10wt%, Cr 0.50wt%;

The nickel pig iron mainly comprises: 0.05wt% Ni, 0.0001wt% Co, 92.36wt% Fe, 0.98wt% S, 3.62wt% C, 2.75wt% Cr, 0.19wt% Mn, and 0.01wt% P;

The electric furnace slag mainly comprises: 0.002wt% Ni, 0.0001wt% Co, 12.61wt% Fe, 21.48wt% Si, 26.31wt% Ca, 1.26wt% Al, 0.88wt% Mn, 1.68wt% Mg, and 0.57wt% Cr.

Effect Example 1

Quality of ferronickel and nickel pig iron: Table 1 and Table 2 are comparison tables of the main element contents of ferronickel and nickel pig iron, respectively. Examples 1 to 3 are ferronickel and nickel pig iron prepared by the process scheme of this article. The grade of ferronickel meets the requirements of economic and technical indicators and can enter the ferronickel wet leaching production line, while the nickel pig iron is directly sold for steelmaking.

Table 1 Comparison of main element contents of nickel iron

Table 2 Comparison of main element contents in nickel pig iron

Effect Example 2

Direct recovery rate of nickel, Co and Fe of ferronickel and nickel pig iron:

Table 3 and Table 4 are comparison tables of the direct recovery rates of Ni, Co and Fe of ferronickel and nickel pig iron, respectively. The direct recovery rates of ferronickel, nickel and cobalt in Examples 1 to 3 are all greater than 90%, meeting the requirements of economic and technical indicators.

The direct recovery rate of nickel-iron metal (metal is Ni, Co, Fe) = (metal mass in nickel-iron/metal mass in ferroaluminum slag) × 100%.

Direct recovery rate of nickel pig iron metal (metal is Ni, Co, Fe) = (metal mass in nickel pig iron/metal mass in nickel iron slag + laterite nickel ore acid leaching residue)

Table 3 Comparison of direct recovery rates of nickel, Co and Fe

Table 4 Comparison of direct recovery rates of nickel pig iron Ni, Co, and Fe

Claims (15)

A method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue, characterized in that it comprises the following steps: Drying the iron-aluminum slag, mixing the iron-aluminum slag with flux 1, and then grinding the slag to obtain a mixed material; The mixed material and flux 2 are calcined and pre-reduced in a reducing atmosphere to obtain calcined sand; Smelting roasted sand, flux 3 and reducing agent 1 to obtain ferronickel and ferronickel slag; The nickel-ferronickel slag, laterite nickel ore acid leaching slag, flux 4 and reducing agent 2 are smelted to obtain nickel pig iron and electric furnace slag. The method for resource utilization of ferroaluminum slag and laterite nickel ore acid leaching residue according to claim 1 is characterized in that the main components of the ferroaluminum slag are: 0.40-1.00wt% Ni, 0.10-0.40wt% Co, 10.00-30.00wt% Fe, 1.00-8.00wt% S, 0.50-1.00wt% Al, and 0.50-1.50wt% Na. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1 is characterized in that the iron-aluminum slag is dried to a moisture content of ≤10wt%. The method for resource utilization of ferroaluminum slag and laterite nickel ore acid leaching residue according to claim 1 is characterized in that the mass ratio of the ferroaluminum slag to flux 1 is 1: (0.01-0.05). The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1 is characterized in that the mass ratio of the mixture to the flux 2 is 1:(0.01-0.08). The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching slag according to claim 1 is characterized in that the temperature of the roasting pre-reduction is 700-1080° C. and the time is 10-50 min. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1 is characterized in that the main components of the roasted sand are: 1.50-3.60wt% Ni, 0.35-0.68wt% Co, 30.00-50.00wt% Fe, 0.50-2.10wt% Mn, 1.00-3.00wt% Al, and 1.00-2.00wt% Na. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1 is characterized in that the mass ratio of the roasted sand, flux 3, and reducing agent 1 is 1: (0.01-0.05): (0.03-0.1). The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1 is characterized in that When the roasted sand, flux 3 and reducing agent 1 are smelted, the smelting temperature is 1400-1550° C. and the smelting time is 15-60 minutes. The method for resource utilization of ferroaluminum slag and laterite nickel ore acid leaching slag according to claim 1, characterized in that the main components of the ferronickel are: 10.00-35.00wt% Ni, 2.50-5.00wt% Co, 60.00-80.00wt% Fe, 0.10-0.60wt% S, 1.50-3.00wt% C; and/or The main components of the nickel-iron slag are: 0.01-0.25wt% Ni, 0.001-0.01wt% Co, 10.00-30.00wt% Fe, 5.00-20.00wt% Si, 2.00-8.00wt% Ca, 2.00-10.00wt% Al, 0.50-2.50wt% Mn, 0.10-0.60wt% Mg, and 0.01-0.13wt% Cr. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching slag according to claim 1 is characterized in that the main components of the laterite-nickel ore acid leaching slag are: 0.05-0.75wt% Ni, 0.0001-0.001wt% Co, 40.00-57.00wt% Fe, 4.00-12.00wt% Si, 0.10-1.00wt% Ca, 1.00-5.00wt% Al, 0.10-0.60wt% Mn, 0.10-1.00wt% Mg, and 0.50-1.20wt% Cr. The method for resource utilization of ferroaluminum slag and laterite nickel ore acid leaching residue according to claim 1 is characterized in that the mass ratio of the ferronickel slag, laterite nickel ore acid leaching residue, flux 4, and reducing agent 2 is 1: (1-3): (0.01-0.03): (0.04-0.11). The method for resource utilization of ferroaluminum slag and laterite nickel ore acid leaching residue according to claim 1 is characterized in that when ferronickel slag, laterite nickel ore acid leaching residue, flux 4 and reducing agent 2 are smelted, the smelting temperature is 1450-1600° C. and the time is 20-60 min. The method for resource utilization of iron-aluminum slag and laterite nickel ore acid leaching slag according to claim 1, characterized in that the main components of the nickel pig iron are: 1.00-3.00wt% Ni, 0.01-0.05wt% Co, 80.00-96.00wt% Fe, 0.10-0.80wt% S, 1.00-3.00wt% C, 1.00-3.50wt% Cr, 0.05-0.25wt% Mn, 0.10-0.32wt% P; and/or The electric furnace slag mainly comprises: 0.01-0.03wt% Ni, 0.0001-0.001wt% Co, 5.00-30.00wt% Fe, 5.00-20.00wt% Si, 10.00-25.00wt% Ca, 3.00-10.00wt% Al, 0.10-1.50wt% Mn, 1.00-5.00wt% Mg, and 0.05-1.00wt% Cr. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1 is characterized in that the flux 1, flux 2, flux 3, and flux 4 are each independently selected from limestone, quartz sand, At least one of bauxite and iron nuggets; and/or The reducing agent 1 and the reducing agent 2 are each independently selected from at least one of graphite slag, anthracite, and graphite anode residues.