Arsenic removing technology for zinc hydrometallurgy

A hydrometallurgy and process technology, applied in the field of arsenic removal technology of zinc hydrometallurgy, can solve the problems of intractability, large amount of arsenic iron slag, long reaction and settling time, etc. Effect

Inactive Publication Date: 2016-07-06
HUBEI DABEIJIANG ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are as follows: the amount of arsenic iron slag produced is large and difficult to handle, the pipeline is blocked, the solution needs to be raised to a higher temperature, the energy consumption is high, the operating process conditio...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A process for removing arsenic by zinc hydrometallurgy, comprising the following steps:

[0024] Under normal temperature conditions, add neutralizing agent lead-zinc oxide to the leach solution of zinc smelting to adjust the pH value of the leach solution to 4.5-5, then add oxidant hydrogen peroxide to remove iron ions in the solution, so that most of the ferrous ions are in the form of goethite Form removal, a small amount is removed in the form of ferric hydroxide, the addition rate of hydrogen peroxide is based on keeping the content of ferric ions in the solution less than 1g / L, and the total amount added is 2.2 times the total mass of ferric ions in the zinc leaching solution , and the pH value of the leachate was maintained at 4.5-5 by adjusting the amount of the neutralizing agent lead-zinc oxide ore, and filtered to remove the lead-arsenic-iron ore precipitate, and completed the process of removing arsenic and iron from the zinc smelting leachate. When the conc...

Embodiment 2

[0027] A process for removing arsenic by zinc hydrometallurgy, comprising the following steps:

[0028] Under normal temperature conditions, add neutralizing agent lead-zinc oxide to the leaching solution of copper smelting soot with an iron content of 3-10g / L and an arsenic concentration of about 20-40g / L to adjust the pH value of the leaching solution to 4.5-5, and then add Oxidant hydrogen peroxide removes iron ions in the solution, so that most of the ferrous ions are removed in the form of goethite, and a small amount is removed in the form of ferric hydroxide. The addition rate of hydrogen peroxide is to keep the content of ferric ions in the solution less than 1g / L shall prevail, the total amount added shall be 2.2 times the total mass of ferrous ions in the copper smelting soot leaching solution, and the pH value of the leaching solution shall be maintained at 4.5-5 by adjusting the addition amount of the neutralizing agent lead-zinc oxide, and the lead shall be remove...

Embodiment 3

[0032] A process for removing arsenic by zinc hydrometallurgy, comprising the following steps:

[0033] Under normal temperature conditions, add neutralizing agent lead-zinc oxide to the leach solution of zinc smelting to adjust the pH value of the leach solution to 4.5-5, then add oxidant hydrogen peroxide to remove iron ions in the solution, so that most of the ferrous ions are in the form of goethite Form removal, a small amount is removed in the form of ferric hydroxide, the addition rate of hydrogen peroxide is based on keeping the content of ferric ions in the solution less than 1g / L, and the total amount added is twice the total mass of ferric ions in the zinc leaching solution , and the pH value of the leachate was maintained at 4.5-5 by adjusting the amount of the neutralizing agent lead-zinc oxide ore, and filtered to remove the lead-arsenic-iron ore precipitate, and completed the process of removing arsenic and iron from the zinc smelting leachate. When the concentr...

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PUM

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Abstract

The invention discloses an arsenic removing technology for zinc hydrometallurgy. The arsenic removing technology includes the following steps that under the normal-temperature condition, a neutralizing agent is added into a leaching agent in the metallurgical process to adjust the pH value of the leaching agent to be the constant value; and then an oxidizing agent is added to remove iron ions in the solution, the pH value of the leaching agent is kept at the constant value by adjusting the adding amount of the neutralizing agent, sediment is filtered out and removed, and filtrate generated after iron removing and arsenic removing is obtained. By means of the method, the neutralizing agent of lead-zinc oxide ore is used for replacing a neutralizing agent of calcium carbonate or whitewash used traditionally, generation of arsenic and iron slag is eliminated, zinc in lead zinc ore can be recycled through the wet process, zinc sulfate products are produced, produced lead, arsenic and iron ore sediment is rich in valuable metal such as lead and iron, lead bullion and arsenic products can be produced through a pyrogenic process, the production cost is reduced, and the phenomenon that a pipeline is blocked due to agglomeration of whitewash in the using process is avoided.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a process for removing arsenic in zinc hydrometallurgy. Background technique [0002] In the hydrometallurgical industry, the leachate of ore often contains more impurity metal ions. If qualified metal products are to be produced, the leachate must be deeply removed. The leaching solution of copper smelting soot often contains a certain amount of arsenic impurities, and arsenic often exists in the form of arsenate and arsenite. Removing arsenic is an important process for the purification of leaching solution. [0003] At present, domestic methods for removing arsenic mainly include lime neutralization precipitation, calcium carbonate neutralization precipitation, iron-arsenic co-precipitation and sodium sulfide precipitation. The lime neutralization precipitation method is to use lime to adjust the pH of the solution to about 5.0, so that most of the arsenic and calcium in the ...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B19/20C22B7/02
CPCC22B3/44C22B7/006C22B7/02C22B19/26Y02P10/20
Inventor 廖广东陈荣升王珊汪领锋汤海波李杰
Owner HUBEI DABEIJIANG ENVIRONMENTAL TECH CO LTD
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