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Process for removing arsenic by converting and leaching arsenic-containing soot produced by copper-lead pyrometallurgy

A technology of pyrometallurgy and lead fire method, which is applied in the field of conversion and leaching of arsenic-containing arsenic in copper-lead pyrometallurgy smelting, can solve the problems of high chemical cost, high arsenic removal rate, and difficulty in achieving it, and achieve simple equipment, The effect of simple processing and easy engineering implementation

Inactive Publication Date: 2021-01-08
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the arsenic-containing soot is treated by the conventional stirring and leaching method with high acid-base ratio and large liquid-solid ratio.

Method used

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  • Process for removing arsenic by converting and leaching arsenic-containing soot produced by copper-lead pyrometallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A copper smelting company in Hunan has electric dust collection. The chemical composition of raw materials mainly includes Cu 16.38%, As 12.8%, Zn 2.22%, Pb 11.10%, Fe 1.29%, S 11.15% and Bi 2.90%. The soot is used as raw material. Adopting the method of the present invention to process arsenic removal comprises the following steps:

[0039]The raw materials are crushed and mixed evenly with double rollers. Take 100g of the mixed material and put it in a ground jar, measure 8ml of tap water, add 20g of high iron sulfate, mix it into the soot, and mix it evenly with a spoon. Measure 14ml of concentrated sulfuric acid (36N), quickly drop it into the well-mixed and moistened soot, and quickly mix it evenly, cover it, and put it in an oven set at 120°C. After reaching the temperature, keep it for 4 hours , take out to cool slightly. Measure 500ml of tap water, add it to a jar, stir and leach for 2 hours at room temperature, filter with suction, and rinse to obtain 648ml of...

Embodiment 2

[0042] Copper smelting soot from a certain place in Henan, the main chemical composition of raw materials includes Cu 21.10%, As 7.02%, Zn2.72%, Pb3.15%, Fe 10.82%, S 12.03% and Bi 0.60%, using this soot as raw material, using this The inventive method for dealing with arsenic removal comprises the following steps:

[0043] The raw materials are crushed and mixed evenly with double rollers. Take 100g of the mixed material and put it in a ground jar, measure 12ml of tap water, add 10g of pyrolusite, mix it into the soot, and mix it evenly with a spoon. Measure 7ml of concentrated sulfuric acid (36N), quickly drop it into the well-mixed and moistened soot, and quickly mix it evenly, cover it, and put it in an oven set at 80°C, and keep it for 8 hours after reaching the temperature , take out to cool slightly. Measure 500ml of tap water, add it to a jar, stir and leach at 60°C for 1 hour, filter with suction, and rinse to obtain 688ml of leaching solution. Sampling and analyzing...

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Abstract

The invention discloses a process for removing arsenic by converting and leaching arsenic-containing soot produced by copper-lead pyrometallurgy. The process comprises the following steps of: uniformly mixing an oxidation promoter and water with the arsenic-containing soot produced by copper-lead pyrometallurgy, wherein the addition proportion of the water is 4-15% of the mass of the arsenic-containing soot, and the oxidation promoter comprises one or more of ferric sulfate, pyrolusite, sodium persulfate or sodium bismuthate; adding concentrated sulfuric acid into the wetted soot, quickly anduniformly stirring, and then carrying out heat preservation and moisture preservation reaction in a closed reactor at room temperature to 150 DEG C, wherein the addition amount of the concentrated sulfuric acid is 5-35% of the mass of the arsenic-containing soot; and adding water which is 3-6 times of the mass of the material into the reacted material, stirring and leaching. The process disclosedby the invention can achieve a relatively high soot arsenic removal rate and a relatively low arsenic content of leaching residues, and is simple in treatment process, simple in equipment and easy forengineering implementation.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal smelting, and in particular relates to a process for converting and leaching arsenic-containing soot from copper-lead fire smelting. Background technique [0002] The smelting of copper and lead uses its sulfide concentrates as raw materials, and non-ferrous metal ores are often associated with arsenic. Every year, more than 5,000 tons of arsenic is brought into my country from non-ferrous metal smelting, and it is dispersed in the materials of various smelting processes. The recovery and treatment of arsenic And safety environment management brings great difficulty. In the smelting process of non-ferrous metals, arsenic is easy to oxidize, and enters the soot in the form of relatively stable low-priced arsenic oxide and arsenic trioxide, or forms with other metal components in the soot during the volatilization process, such as lead, iron, copper, zinc, bismuth, etc. Arsenate and arseni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B3/08C22B30/04C22B1/00
CPCC22B1/005C22B7/007C22B7/02C22B30/04Y02P10/20
Inventor 佘宗华
Owner CHANGSHA RES INST OF MINING & METALLURGY
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