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Method for removing arsenic and recovering heavy metal from copper smelting wastewater

A recovery method and technology for heavy metals, applied in chemical instruments and methods, copper oxide/copper hydroxide, inorganic chemistry, etc., can solve the problems of large arsenic hazardous waste residues, unrecovered valuable metals, etc., to achieve efficient recycling and reduce emissions , the effect of saving production costs and environmental risks

Inactive Publication Date: 2020-03-27
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for removing arsenic from copper smelting wastewater and recovering heavy metals, so as to solve the problems of non-recovery of valuable metals and the generation of a large amount of arsenic-containing hazardous waste in the existing methods

Method used

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  • Method for removing arsenic and recovering heavy metal from copper smelting wastewater

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Embodiment 1

[0023] Embodiment 1. A method for removing arsenic from copper smelting wastewater and recovering heavy metals, comprising the following steps:

[0024] A. Add a sodium sulfide solution with a concentration of 50g / L to the arsenic-containing wastewater, stir and react at room temperature for 0.5 hours, the amount of sodium sulfide added is 1.2 times the theoretical amount, and the heavy metals and arsenic in the solution are initially precipitated to obtain arsenic removal Slag and initial arsenic removal solution;

[0025] B, adding excess concentration to the initial arsenic removal solution obtained in step A is 50g / L of sodium sulfide, the amount of sodium sulfide added is 2 times of the theoretical amount, and the reaction time is 2 hours to obtain orpiment and deep arsenic removal solution;

[0026] C, the arsenic-removing slag obtained by step A is dropped into a concentration of 50g / L of sodium hydroxide solution for leaching, the ratio of the volume of sodium hydroxid...

Embodiment 2

[0032] Embodiment 2. A method for removing arsenic from copper smelting wastewater and recovering heavy metals, comprising the following steps:

[0033] A. Add a sodium sulfide solution with a concentration of 80g / L to the arsenic-containing wastewater, stir and react at room temperature for 1 hour, the amount of sodium sulfide added is 1.3 times the theoretical amount, and the heavy metals and arsenic in the solution are initially precipitated to obtain arsenic removal Slag and initial arsenic removal solution;

[0034] B, adding excess concentration to the initial arsenic removal solution obtained in step A is 80g / L of sodium sulfide, the amount of sodium sulfide added is 3 times of the theoretical amount, and the reaction time is 1.5 hours to obtain orpiment and deep arsenic removal solution;

[0035] C, the arsenic-removing slag obtained in step A is put into concentration and is leached in the sodium hydroxide solution of 75g / L, and the ratio of sodium hydroxide solution ...

Embodiment 3

[0041] Embodiment 3. A method for removing arsenic from copper smelting wastewater and recovering heavy metals, comprising the following steps:

[0042]A. Add a sodium sulfide solution with a concentration of 100g / L to the arsenic-containing wastewater, stir and react at room temperature for 2 hours, the amount of sodium sulfide added is 1.5 times the theoretical amount, and the heavy metals and arsenic in the solution are initially precipitated to obtain arsenic removal Slag and initial arsenic removal solution;

[0043] B, adding excess concentration to the initial arsenic removal solution obtained in step A is 100g / L of sodium sulfide, the amount of sodium sulfide added is 4 times of the theoretical amount, and the reaction time is 1 hour to obtain orpiment and deep arsenic removal solution;

[0044] C, the arsenic-removing slag obtained in step A is put into concentration and is leached in the sodium hydroxide solution of 100g / L, and the ratio of sodium hydroxide solution ...

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Abstract

The invention discloses a method for removing arsenic and recovering heavy metal from copper smelting wastewater, and belongs to the field of environmental protection engineering. The problems that inan existing method, valuable metal is not recovered, and a large amount of arsenic-containing hazardous waste slag is generated are solved. The method comprises the following steps that sodium sulfide is added into arsenic-containing wastewater to obtain arsenic removal slag and initial arsenic removal liquid; excessive sodium sulfide is added into the initial arsenic removal liquid to obtain orpiment and deep arsenic removal liquid; the arsenic removal slag is put into a sodium hydroxide solution to be leached to obtain an arsenic-containing solution I and metal slag; pH of the arsenic-containing solution I is adjusted through sulfuric acid to obtain orpiment and an arsenic-containing solution II; the deep arsenic removal liquid and the arsenic-containing solution II are mixed, ferrous hydroxide and calcium oxide are added for neutralization, oxygen is blown, and thus wastewater and neutralization slag are obtained; the metal slag is leached through hydrochloric acid to obtain leachate and leaching residue; the leachate is neutralized through a sodium hydroxide solution to obtain bismuth oxychloride; and sodium hydroxide continues to be added into filtrate to obtain copper hydroxide. According to the method, arsenic and valuable metal in the wastewater are efficiently recycled.

Description

technical field [0001] The invention belongs to the field of environmental protection engineering, and in particular relates to a method for removing arsenic from copper smelting wastewater and recovering heavy metals. Background technique [0002] The copper smelting sewage acid process contains a large amount of arsenic and heavy metals such as copper and bismuth. These heavy metals and arsenic enter the wastewater and neutralization slag in large quantities as the process progresses. Improper treatment will cause serious pollution to soil and water resources. affect people's physical and mental health and social stability. In recent years, a lot of research has been done on the treatment of arsenic in arsenic-containing wastewater. The main treatment processes formed are: membrane treatment method, adsorption method, ion exchange method, biological method, flocculation precipitation method, and chemical precipitation method. Among them, membrane treatment method , adsorp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/11C22B7/00C22B15/00C22B30/06C01G3/02C01G29/00
CPCC01G3/02C01G29/00C22B1/11C22B7/007C22B15/0089C22B30/06Y02P10/20
Inventor 李守荣李彦龙王宏伟鲁兴武王长征余江鸿庞振业李俞良程亮牛永胜
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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