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Process for conducting resource recycling on copper and arsenic from arsenic-containing waste acid

A technology for arsenic fouling acid and copper recovery, which can be applied in the direction of improving process efficiency and can solve the problem of arsenic carcinogenic latency and other issues

Inactive Publication Date: 2016-06-22
方端
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, arsenic has carcinogenic effects and long-term effects with a long incubation period

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Neutralize and remove impurities:

[0037] Neutralize the arsenic-containing polluted acid with calcium hydroxide to a pH of 1 to reduce the acidity of the polluted acid;

[0038] (2) Precipitation of arsenic:

[0039] Add copper sulfate to the neutralizing solution, control the molar ratio of Cu and As to 1.4:1, adjust the pH of the system to 10 to precipitate As, and obtain copper arsenite;

[0040] (3) Copper arsenite washing and impurity removal:

[0041] By adding a sulfuric acid solution with a pH of 2, controlling the liquid-solid ratio of 4:1, washing and removing impurities, and increasing the content of As and Cu in copper arsenite

[0042] (4) Copper arsenite leaching:

[0043] Using a sulfuric acid solution with a concentration of 10%, the copper arsenite is leached under the condition that the liquid-solid ratio is 6:1;

[0044] (5) Preparation of arsenic trioxide:

[0045] a. By passing into SO 2 , reducing the copper arsenite solution to arsenic...

Embodiment 2

[0048] (1) Neutralize and remove impurities:

[0049] Neutralize the arsenic-containing polluted acid with calcium hydroxide to a pH of 4 to reduce the acidity of the polluted acid;

[0050] (2) Precipitation of arsenic:

[0051] Add copper sulfate to the neutralizing solution, control the molar ratio of Cu and As to 2:1, adjust the pH of the system to 4 to precipitate As, and obtain copper arsenite;

[0052] (3) Copper arsenite washing and impurity removal:

[0053] By adding a sulfuric acid solution with a pH of 2, controlling the liquid-solid ratio of 4:1, washing and removing impurities, and increasing the content of As and Cu in copper arsenite

[0054] (4) Copper arsenite leaching:

[0055] Using a sulfuric acid solution with a concentration of 5%, the copper arsenite is leached under the condition that the liquid-solid ratio is 3:1;

[0056] (5) Preparation of arsenic trioxide:

[0057] a. By passing into SO 2 , reducing the copper arsenite solution to arsenic tri...

Embodiment 3

[0060] (1) Neutralize and remove impurities:

[0061] Neutralize the arsenic-containing polluted acid with calcium hydroxide to a pH of 4 to reduce the acidity of the polluted acid;

[0062] (2) Precipitation of arsenic:

[0063] Add copper sulfate to the neutralizing solution, control the molar ratio of Cu and As to 1.5:1, adjust the pH of the system to 6 to precipitate As, and obtain copper arsenite;

[0064] (3) Copper arsenite washing and impurity removal:

[0065] By adding a sulfuric acid solution with a pH of 2, controlling the liquid-solid ratio of 4:1, washing and removing impurities, and increasing the content of As and Cu in copper arsenite

[0066] (4) Copper arsenite leaching:

[0067] Using a sulfuric acid solution with a concentration of 15%, the copper arsenite is leached under the condition that the liquid-solid ratio is 5:1;

[0068] (5) Preparation of arsenic trioxide:

[0069] a. By passing into SO 2 , reducing the copper arsenite solution to arsenic ...

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Abstract

The invention discloses a process for conducting resource recycling on copper and arsenic from arsenic-containing waste acid. Resource recycling of the arsenic-containing waste acid is realized through the steps of neutralization and impurity removal, arsenic precipitation, washing, leaching, evaporation crystallization and preparation of arsenic trioxide through dissolution. According to the process, arsenic in the arsenic-containing waste acid is precipitated, converted and prepared into arsenic trioxide, and the defects of preparing arsenic trioxide by reducing copper arsenite with sulfur dioxide are overcome; high-standard arsenic trioxide is obtained, and treatment of the waste acid and reutilization of copper and arsenic resources are realized.

Description

technical field [0001] The invention relates to the technical field of metal refining, in particular to a process for recovering copper and arsenic from polluted acid containing arsenic. Background technique [0002] More than 10,000 tons of arsenic enters the flue gas in my country's non-ferrous smelting system every year, and part of the arsenic enters the sewage acid during flue gas purification, and its content generally reaches 2~6g / L. Sewage acid from non-ferrous smelting has the characteristics of high acidity, many types of heavy metal ions, and high concentration of arsenic. It has become one of the main pollution sources of arsenic in my country. At present, the main methods for treating arsenic-containing wastewater at home and abroad include neutralization precipitation method, flocculation precipitation method, ferrite method, sulfide precipitation method, etc. These methods are suitable for treating high-concentration arsenic-containing wastewater, but the gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B30/04
CPCY02P10/20
Inventor 方端
Owner 方端
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