CN105177301A - Technology for recycling and refining furnace clinker of lead and zinc metallurgical furnace - Google Patents

Abstract

The invention discloses a technology for recycling and refining furnace clinker of a lead and zinc metallurgical furnace. The technology comprises the following steps: smashing furnace clinker of the lead and zinc metallurgical furnace into powder with the particle size smaller than 1mm, and putting the powder in a magnetic separator for separation; obtaining iron powder for standby application, wherein the selected magnetic field intensity of the magnetic separator is required to greater than 480 kA/m; putting the iron powder in a container capable of being heated and pressurized, adding sulfuric acid solution, and under the heating and pressurizing conditions, turning over the container to enable the iron powder and sulfuric acid solution to be fully mixed and react; directly extracting and recycling gold and silver in the reactant, adopting the replacement or sulfide sedimentation manner to recycle metal substances such as silver, copper, lead, arsenic and the like from the left residue; after purifying and refining the residue for the second time, spraying and heating for reaction to generate iron oxide red, and recycling the iron oxide red. Compared with the prior art, the manners of magnetic separation, acidolysis, replacement and oxidation recycling are mainly adopted for decomposition and extraction and multiple recyclable substances can be extracted. The technology is energy-saving and environment-friendly and has popularization and application value.

Description

A process for recovering and refining lead-zinc metallurgical furnace slag

technical field

The invention relates to a process for recovering slag from a metallurgical furnace, in particular to a process for recovering and refining slag from a lead-zinc metallurgical furnace.

Background technique

The waste slag produced in the non-ferrous metal smelting process is large in quantity and variety. At present, the annual discharge of smelting waste residue is about 50 million tons. Stacking needs to occupy land or farmland. In addition, the composition of non-ferrous metal smelting residues is complex. Some smelting wastes have been piled up in open-air slag yards for a long time. After different channels of migration or transformation, they often cause varying degrees of pollution to the surrounding environment. Moreover, many smelting waste residues also contain usable heavy metal components. These waste residues are harmful when discarded, but become valuable when used. However, in the prior art, the recovery process used for lead-zinc metallurgical furnace slag can only extract a part of useful substances, and cannot be fully extracted and utilized. Therefore, a new method needs to be born.

Contents of the invention

The object of the present invention is to provide a process for recovering and refining the slag of a lead-zinc metallurgical furnace in order to solve the above problems.

The present invention achieves the above object through the following technical solutions:

The present invention comprises the following steps:

(1) Pulverize the slag of lead-zinc metallurgical furnace, put into magnetic separator after pulverizing to the powder below 1mm;

(2) The magnetic field strength of the magnetic separator needs to be above 480kA/m, and the obtained iron powder is used for later use;

(3) Iron powder is put into the container that can be heated and pressurized, add sulfuric acid solution, under heating and pressurizing condition, roll container, make iron powder and sulfuric acid solution fully mix and react;

(4) After the reaction is sufficient, filter the solution, add sodium chloride to precipitate silver ions, add zinc flakes and hydrochloric acid solution, to reduce silver chloride to elemental silver, and obtain reclaimed silver after filtering;

(5) Add hydrogen peroxide and hydrochloric acid to the remaining liquid in step (4), and add sodium chlorate to react to generate auric acid after reacting for 6 hours, filter off the residue, add sodium metabisulfite to the liquid, and wait for black precipitation to appear at the bottom of the container Drying is carried out, and finally only black precipitate is left;

(6) smelting the black precipitate, the gold obtained after smelting at a high temperature of more than 1200 degrees during smelting;

(7) reclaim metal substances such as silver, copper, lead and arsenic by replacing the remaining residue in step (5) or by means of sulfide precipitation;

(8) After the secondary residue is purified and removed, it is sprayed and heated to react to generate iron oxide red, which is recovered.

The beneficial effects of the present invention are:

The present invention is a recovery and refining process for lead-zinc metallurgical furnace slag. Compared with the prior art, the present invention mainly adopts magnetic separation, acid hydrolysis, replacement and oxidation recovery to decompose and extract, and can extract a variety of recyclable slags. Material, energy saving and environmental protection, has the value of popularization and application.

Detailed ways

The present invention will be further described below:

The present invention comprises the following steps:

(1) Pulverize the slag of lead-zinc metallurgical furnace, put into magnetic separator after pulverizing to the powder below 1mm;

(2) The magnetic field strength of the magnetic separator needs to be above 480kA/m, and the obtained iron powder is used for later use;

(3) Iron powder is put into the container that can be heated and pressurized, add sulfuric acid solution, under heating and pressurizing condition, roll container, make iron powder and sulfuric acid solution fully mix and react;

(4) After the reaction is sufficient, the solution is filtered, and sodium chloride is added to precipitate silver ions. During the reaction, some colorless gas nitric oxide and brown gas nitrogen dioxide will be produced. Zinc flakes and hydrochloric acid solution are added to make chlorine The silver oxide is reduced to elemental silver. Once the reduction reaction starts, a large amount of heat will be released. After the zinc flakes and hydrochloric acid are added to the solution, the zinc or the hydrogen generated by the reaction with the acid can reduce the silver chloride. At the same time, the silver chloride itself and the light It will also be decomposed into simple silver, and the solution will turn dark blue completely. The copper and silver have been dissolved, but the gold remains in the residue, and the silver can be recovered after filtration;

(5) Add hydrogen peroxide and hydrochloric acid to the remaining liquid in step (4), mix to produce chlorine gas, because high concentration of chloride ions can be combined with trivalent gold to form a relatively more stable auric acid complex (AuCl3/AuCl4-) Chlorine alone can oxidize stable gold. After 6 hours of reaction, sodium chlorate is added to react to generate gold chlorate. The residue is filtered off, and sodium metabisulfite is added to the liquid. After black precipitation appears at the bottom of the container, it is dried, and finally only lower black precipitate;

(6) smelting the black precipitate, the gold obtained after smelting at a high temperature of more than 1200 degrees during smelting;

(7) reclaim metal substances such as silver, copper, lead and arsenic by replacing the remaining residue in step (5) or by means of sulfide precipitation;

(8) After the secondary residue is purified and removed, it is sprayed and heated to react to generate iron oxide red, which is recovered.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments, and what described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention will also have other functions without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (1)

1. reclaim a refining technique for plumbous zinc metallurgical furnace slag, it is characterized in that, comprise the following steps:

(1) slag of plumbous zinc metallurgical furnace is pulverized, put into magnetic separator after being crushed to the powder of below 1mm and carry out sorting;

(2) magnetic separator selects magneticstrength need at more than 480kA/m, and gained iron powder is stand-by;

(3) iron powder is put into the container that can heat and pressurize, add sulphuric acid soln, under heating and pressurizing condition, rolling container, makes iron powder and sulphuric acid soln fully mix and react;

(4), after sufficient reacting, solution is filtered, adds sodium-chlor and silver ions is precipitated, add zinc metal sheet and hydrochloric acid soln, be used for making silver chloride reduction be elemental silver, after filtration, be recycled silver;

(5) remaining liquid in step (4) is added hydrogen peroxide and hydrochloric acid, react after 6 hours and add the golden chloric acid of sodium chlorate reaction generation, filter out residue, Sodium Pyrosulfite is added by liquid, occur drying after black precipitate until container bottom, finally only remaining black precipitate;

(6) melting is carried out in black precipitate, the gold be recycled after adopting the high melt of more than 1200 degree during melting;

(7) residual residue in step (5) is carried out replace or the metallics such as mode recover silver copper-lead arsenic of sulfide precipitation;

(8), after secondary residual carries out purification and impurity removal, carry out spraying heating, reaction generates red iron oxide, reclaims red iron oxide.