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Method and system for processing zinc volatilization kiln slag

A technology for zinc volatilization and kiln slag, applied in the field of zinc volatilization kiln slag treatment, can solve the problems of environmental pollution, poor economy, waste of social resources, etc.

Inactive Publication Date: 2017-01-11
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, zinc volatilization kiln slag has been mainly used for laying roads and cement fillers. Most of them have not been used rationally and have been piled up in various zinc smelting plants across the country. This not only occupies a large area of ​​land resources, but also easily causes environmental pollution and wastes social resources.
It is difficult to recover valuable metals such as iron in zinc volatilization kiln slag, and various technical and process routes are feasible, but the economy is poor

Method used

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  • Method and system for processing zinc volatilization kiln slag
  • Method and system for processing zinc volatilization kiln slag
  • Method and system for processing zinc volatilization kiln slag

Examples

Experimental program
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Effect test

Embodiment 1

[0076] Zinc volatilization kiln slag contains 24wt% iron, of which metallic iron accounts for 53wt% of total iron, lead content is 1.5wt%, zinc content is 3.8wt%, silver content is 110g / t, carbon content is 35wt%, indium content is 180g / t; First, crush the zinc volatilization kiln slag until the particle size is not higher than 3mm, then dry it to obtain a dry material with a moisture content of not higher than 0.5wt% kiln slag, and then pelletize it through a disc pelletizer to obtain pellets , raise the temperature of the gas melting furnace to 1560 degrees Celsius, keep it warm for 30 minutes, and then put the dried pellets into the molten pool, so that the liquid level of the molten pool reaches one-third of the height of the gas melting furnace, and the molten pool is completed Afterwards, continuous feeding is carried out. During the feeding process, it is necessary to ensure that all the materials of the previous batch are completely melted, and then the next batch of m...

Embodiment 2

[0078] Zinc volatilization kiln slag contains 32wt% iron, of which metallic iron accounts for 55wt% of total iron, lead content is 1.8wt%, zinc content is 4.3wt%, silver content is 120g / t, carbon content is 38wt%, indium content is 220g / t; crush the zinc volatilization kiln slag until the particle size is not higher than 3mm, and then dry it to obtain the dried crushed material with a moisture content of not higher than 0.5wt%, and then pelletize it through a disc pelletizer to obtain pellets. The temperature of the gas melting furnace is raised to 1580 degrees Celsius, and the temperature is kept for 30 minutes, and then the dried pellets are put into the molten pool, so that the liquid level of the molten pool reaches one-third of the height of the gas melting furnace. After the molten pool is built, For continuous feeding, the feeding process must ensure that the previous batch of materials are completely melted and then the next batch of materials is added so that the liqu...

Embodiment 3

[0080] Zinc volatilization kiln slag contains 38wt% iron, of which metallic iron accounts for 49wt% of total iron, lead content is 3.0wt%, zinc content is 5.0wt%, silver content is 138g / t, carbon content is 33wt%, indium content is 256g / t; Firstly, the zinc volatilization kiln slag is crushed until the particle size is not higher than 3mm, and then dried to obtain a crushed and dried material with a moisture content of not higher than 0.5wt%, and then pelletized by a disc pelletizer to obtain pellets , raise the temperature of the gas melting furnace to 1600 degrees Celsius, keep it warm for 30 minutes, and then put the dried kiln slag pellets into the molten pool, so that the liquid level of the molten pool reaches one-third of the height of the gas melting furnace, and the molten pool After the production is complete, continuous feeding is carried out. During the feeding process, it is necessary to ensure that all the materials of the previous batch are completely melted, an...

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Abstract

The invention discloses a method and system for processing zinc volatilization kiln slag. The method includes the steps that firstly, the zinc volatilization kiln slag is subjected to crushing treatment, so that kiln slag crushed materials can be obtained; secondly, the kiln slag crushed materials are subjected to drying treatment, so that crushed and dried materials can be obtained; thirdly, the crushed and dried materials are subjected to pelletizing, so that pellets can be obtained; and fourthly, the pellets, silica and calcium-series additives are supplied into a fuel gas melt separation furnace, so that smoke dust containing lead and zinc, molten iron and melt separation slag can be obtained. By means of the method, comprehensive recovery of iron, lead, zinc, silver and indium in the zinc volatilization kiln slag can be achieved, the iron recovery rate is higher than 92%, the lead recovery rate is higher than 96%, the zinc recovery rate is higher than 98%, the silver recovery rate is higher than 85%, and the indium recovery rate is higher than 85%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular, the invention relates to a method and a system for treating zinc volatilization kiln slag. Background technique [0002] The rotary kiln volatilization method is one of the methods widely used to deal with zinc leaching slag at present. In this method, coke powder added to the dried leaching slag is added to the rotary kiln for treatment. The furnace gas temperature in the kiln is generally controlled at 1000-1300 Celsius, during the volatilization process of the rotary kiln, the processed material is mixed with a reducing agent, and sometimes a small amount of lime is added to promote the decomposition of zinc sulfide and adjust the composition of the kiln slag. The metal oxides in the leaching slag contact with the coke powder, and the reduced metal vapor enters the gas phase, and is oxidized into oxides in the gas phase. After the smoke is cooled, it is introduced into the d...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/24
CPCC22B1/24C22B7/001C22B7/04Y02P10/20
Inventor 吴佩佩曹志成薛逊古明远王敏王健月吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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