SU1735402A1 - Method for processing polymetallic sulfide raw materials - Google Patents

Abstract

Use: The invention can be used to process copper, zinc, copper-zinc sulfide materials. Essence: the firing of sulphide polymetallic raw materials is carried out when the dispersed water is fed to the bottom of the furnace with the ratio of water volume to technological blow volume (0.2-5): 2X HO52 table.

Description

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The invention relates to non-ferrous metallurgy and can be used for the processing of copper, copper-zinc, zinc-sulphide materials.

A known method of reducing nickel oxide in a fluidized bed with the supply of water and process gas to a layer of material. The water supply to the bed serves to increase the reduction potential of the process.

The disadvantage of this method is to reduce the process temperature and, as a consequence, a decrease in the performance of the process.

The closest in technical essence is a method of processing polymetallic sulphide raw materials, including its firing in a fluidized bed furnace with the supply of a technological blow under the furnace hearth.

The main disadvantage of this method is the low content of sulfur dioxide in the process gases and the high content of ferrites in the calcine.

The aim of the invention is to increase the content of sulfuric anhydride in process gases and reduce the content of ferrites in the calcine.

The goal is achieved by the fact that in a known method of processing sulphide polymetallic materials, including its firing in a fluidized bed furnace during the process flow under the bottom of the furnace, the firing is carried out when the bottom of the furnace is sprayed water at a ratio of water to volume of oxygen-containing blow 0.2-5): 2- 105.

The interval of the ratio of the volume of water to the volume of the process blow is due to the fact that with an increase in the ratio of more than 5: 2-10, the burning temperature decreases, the humidity of the exhaust gases increases, and the content of sulfur dioxide in the exhaust gases decreases. With a decrease in the ratio of less than 0.2: 2-U5, an increase in the content of sulfur dioxide in gases and

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no reduction in ferrite concentration in the calcine is observed.

The method is carried out as follows.

Sulfide polymetallic material is continuously loaded into the furnace KS and purged with process blast supplied through the working chamber to the bottom of the furnace.

In the process of blowing under the furnace hearth, sprayed water is fed at a ratio to the technological blast (0.2-5): 2x хЮ5.

The presence of water supplied to the lower part of the fluidized bed allows the following reactions to occur:

CU2S + ЗН20 CU20 + ЗН2 + S02,

ZnS + ZN20 ZnO + 3H2 + S02,

Cu2S + 2CU20 6Cu + S02,

ZnS + 2ZnO 3Zn + S02,

ResSm + H2 ZREO + hbO,

ZnO - Rv20z + FeO ZnO + FeO ReaOz.

Copper, zinc and copper-zinc concentrates are used as the initial sulfide polymetallic materials.

The test of the proposed method is carried out on a pilot plant of the KS furnace with an area of 1 m.

Characteristics of the source materials are given in table.1.

PRI me R 1. Copper concentrate is continuously loaded into the CS furnace and is purged with air at a flow rate of 1200 Nm3 / h in the presence of water supplied at a ratio of 0.2 kD; 2 -10. The content of sulfur dioxide in the gases was 12.57%, the concentration of ferrites in the calcine was 9.6% (experiment 2, table 2).

PRI mme R 2. Zinc concentrate is continuously loaded into the CS furnace and purged with oxygen-containing gas at a flow rate of 1150 nm / h in the presence of water supplied

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five

in the ratio of 5: 2 -10. The content of sulfuric anhydride in gases is 12%, the concentration of ferrites in the calcine is 12% (experiment 5, table 2).

PRI me R 3. Copper concentrate is purged with oxygen-containing gas at a flow rate of 1200 nm / h in the presence of water supplied with a ratio of 7: 2 to 105. The process temperature dropped to 850 ° C, the content of sulfur dioxide in the gases decreased to 9%, the content ferrites in the cinder rose to 19.3% (experiment 9, Table 2).

The results of the experiments are presented in table 2.

With a ratio of less than 0.5: 2-105 (experiment 7, Table 2), the content of sulfuric anhydride in gases was 9.5%, the concentration of ferrites in the calcine increased to 17.5%. With a ratio of more than 5: 2-105 (experiment 8.9, Table 2), the content of sulfur dioxide in the gases decreased to 9-9.3%, the concentration of ferrites in the calcine increased to 18.5-19.3%.

Thus, the use of the proposed method in comparison with the known will allow to increase the content of sulfur dioxide in gases from 11 to 12.1%, i.e. by 1.1 abs.%, reduce the ferrite content in the calcine from 18 to 11.8%, i.e. by 6.2 abs.%.

Claims (1)

Invention Formula A method of processing sulphide polymetallic raw materials, including its firing in a fluidized bed furnace with the flow of a process furnace bottom furnace, characterized in that, in order to increase the content of sulfur dioxide in process gases and reduce the ferrite content in the calcine, the burning is carried out when the furnace floor is fed sprayed water when the ratio of the volume of water to the volume of oxygen - 0 containing blowing (0.2-5.0): 2 -105. 0 five 0 five Table 1 45 table 2