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A method for removing arsenic from copper smelting dust

A technology of copper smelting and dust, which is applied in the field of hydrometallurgy, can solve the problems of volatilization into flue gas, loss of valuable metals, environmental pollution, etc., and achieve the effect of reducing output, shortening the process and shortening the process

Active Publication Date: 2017-08-25
YUNNAN TIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of fire method for arsenic removal is to volatilize and remove arsenic in the form of gas, and the generated gas arsenic is discharged into the atmosphere, which will cause environmental pollution, and the fire process will produce a large amount of flue gas, which contains SO 2 And other harmful gases, need to treat the flue gas before discharge, and some valuable metals (such as indium, silver, lead, etc.) are easy to volatilize into the flue gas at high temperature, resulting in the loss of valuable metals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Pour 350ml of industrial sulfuric acid with a concentration of 98g / L into a beaker, and pour 100g of copper smelting dust into the beaker for stirring and mixing, and heat to 75°C, and slowly add 50ml of 35% hydrogen peroxide dropwise to the bottom of the beaker. The temperature was fully reacted for 2.5 hours.

[0024] The composition of the obtained leach solution is: copper 8.83g / L, zinc 25.42g / L, arsenic 13g / L, iron 0.805g / L.

[0025] The composition of the obtained leaching slag is: copper 0.951%, zinc 3.7%, arsenic 7.15%, iron 2.24%, lead 23.52%.

[0026] The leaching rate of arsenic in this experiment was 73.323%, the leaching rate of valuable metals was: copper 91.808%, zinc 90.707%.

[0027] According to the leaching amount of arsenic, the amount of ferric iron needed for arsenic removal is calculated stoichiometrically. Using the leachate produced above, add 45.5g of high-valent iron compound to the remaining leachate after sampling, mix, heat to 85°C, and k...

Embodiment 2

[0032] Pour 700ml of industrial sulfuric acid with a concentration of 98g / L into a beaker, and pour 200g of copper smelting dust into the beaker for stirring and mixing, and heat to 75°C, and slowly add 100ml of 30% hydrogen peroxide dropwise to the bottom of the beaker. Fully reacted at temperature for 3 hours.

[0033] The composition of the obtained leach solution is: copper 11.21g / L, zinc 23.67g / L, arsenic 16.1g / L, iron 1.16g / L.

[0034] The composition of the obtained leaching slag is: copper 1.09%, zinc 3.53%, arsenic 6.72%, iron 1.8%, lead 23.71%.

[0035] The leaching rate of arsenic in this experiment was 71.931%, the leaching rate of valuable metals was: copper 90.46%, zinc 89.89%.

[0036] According to the leaching amount of arsenic, the amount of ferric iron needed for arsenic removal is calculated stoichiometrically. Using the leachate produced above, add 105g of high-valent iron compound to the remaining leachate after sampling, mix, heat to 85°C, and keep stir...

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PUM

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Abstract

A method for removing arsenic from copper smelting dust comprises collecting, leaching, filtering, arsenic removal and separation. Hydrogen peroxide is used for serving as an arsenic oxidant, the oxidation efficiency is high, and after an oxidizing reaction is finished, only water is generated, no harm to a technological process is generated, and any impurity removal process is added. The method is short in process, and ferric iron compounds are directly added in an arsenic removing process; the arsenic removing efficiency is high, the arsenic iron slag produced amount is small, the arsenic iron slag production rate is lower than the rate of other wet method arsenic removing technologies by about 30%, and the environment-friendly effect is good.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for removing arsenic from copper smelting dust. Background technique [0002] Some enterprises deal with copper smelting fumes by fire method, and the fire method firstly removes arsenic. The process of fire method for arsenic removal is to volatilize and remove arsenic in the form of gas, and the generated gas arsenic is discharged into the atmosphere, which will cause environmental pollution, and the fire process will produce a large amount of flue gas, which contains SO 2 Harmful gases such as flue gas need to be treated before they can be discharged, and some valuable metals (such as indium, silver, lead, etc.) are easy to volatilize into the flue gas at high temperature, resulting in the loss of valuable metals. [0003] At present, most of the methods for dealing with copper smelting dust are wet methods, and the main technological processes ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B30/04
CPCY02P10/20
Inventor 蔡兵袁海滨樊有琪宋兴诚杜春云
Owner YUNNAN TIN
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