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A method for recovering gold from smelting polluted acid wastewater

A technology for recovering gold from polluted acid wastewater, applied in the direction of improving process efficiency, etc., can solve the problem of complex polluted acid system, poor adaptability of raw materials, inability to achieve recovery of gold and other valuable metals in polluted acid containing gold, and open circuit for harmful elements And other issues

Active Publication Date: 2021-09-21
CHANGSHA SCI ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the polluted acid contains a large amount of copper ions, the metal replacement method will lead to large consumption of reagents, poor selectivity, low content of precious metals in the tailings, and the introduction of other metal ions into the solution.
Membrane separation method is generally used for fine separation. In the separation process, it is limited to enrichment, and the cost is high, and the membrane technology is immature in complex environments. The application life of the membrane is not long, and it is not suitable for gold recovery of gold-containing polluted acid.
The polluted acid system is complex, and the solvent extraction method has strict requirements on the extraction system and poor adaptability of raw materials. At the same time, this method is not suitable for treating solutions with low gold concentrations, and most solvents have a co-extraction effect on other base metals
[0005] In short, due to the complexity of the sewage acid solution system, the existing traditional technology cannot realize the recovery of gold and other valuable metals in gold-containing sewage acid and the opening of harmful elements. There is an urgent need for a solution to the technical defects of gold recovery in gold-containing sewage acid wastewater new technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A copper smelting sewage acid wastewater, the acidity of the solution is 97.09g / L, F: 2650mg / L, Cl: 4700mg / L, Cu: 3406.52mg / L, As: 8935.38mg / L, Au: 0.45mg / L.

[0026] Step 1: Take the smelting dirty acid wastewater, add 1.2 times the theoretical amount of sodium thiosulfate, that is, 10g / L, stir the reaction time for 15min, flocculate and filter, and obtain copper-rich slag and copper-precipitated liquid;

[0027] Step 2: Take the copper precipitation solution in step 1, and add 1.3 times the theoretical amount of calcium oxide, that is, 22.26g / L. The stirring reaction time is 15 minutes, flocculation and filtration, and arsenic precipitation and fluorine removal residue and arsenic precipitation liquid are obtained;

[0028] Step 3: Take the arsenic-precipitated solution in step 2, add 5 times the theoretical amount of sodium sulfide nonahydrate, that is, 0.31g / L, stir for 15 minutes, flocculate and filter, and obtain gold-rich slag and gold-precipitated solution. The...

Embodiment 2

[0043] A copper smelting sewage acid wastewater, the acidity of the solution is 45.38g / L, F: 1527mg / L, Cl: 8650mg / L, Cu: 1286.44mg / L, As: 6520.34mg / L, Au: 0.36mg / L.

[0044] Step 1: Take the smelting acid waste water and feed it into SO 2 Twice the theoretical amount, reduction reaction for 20 minutes, flocculation and filtration, to obtain copper-rich slag and copper-precipitated liquid;

[0045] Step 2: Take the copper-precipitated solution in step 1, add 1.3 times the theoretical amount of calcium oxide, that is, 12.6g / L, stir the reaction time for 20 minutes, flocculate and filter, and obtain the arsenic-precipitated and fluoride-removed residue and the arsenic-precipitated solution;

[0046] Step 3: Take the arsenic-precipitated liquid in step 2, add 8 times the theoretical amount of sodium hydrosulfide with 70% effective content, that is, 0.26g / L, stir the reaction time for 20min, flocculate and filter, and obtain gold-rich slag and post-gold liquid. The relevant water...

Embodiment 3

[0055] A copper smelting sewage acid wastewater, the solution acidity is 38.24g / L, F: 3750mg / L, Cl: 11250mg / L, Cu: 896.21mg / L, As: 6520.34mg / L, Au: 0.36mg / L.

[0056] Step 1: Take the smelting dirty acid wastewater, add 4 times the theoretical amount of sodium sulfite, that is, 32g / L, perform a reduction reaction for 30 minutes, flocculate and filter, and obtain copper-rich slag and copper-precipitated liquid;

[0057] Step 2: Take the copper-precipitated solution in step 1, add 1.1 times the theoretical amount of calcium carbonate, 1.1 times the theoretical amount of iron sulfate, adjust the pH value to 9.0 with 10wt% milk of lime, stir the reaction time for 30min, flocculate and filter, and obtain Arsenic precipitation and fluorine removal slag and solution after arsenic precipitation;

[0058] Step 3: Take the arsenic-precipitated solution in step 2, add 10 times the theoretical amount of sodium hydrosulfide with 70% effective content, that is, 0.32g / L, stir the reaction ti...

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PUM

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Abstract

The invention discloses a method for recovering gold from polluted acid wastewater, comprising the following steps: (1) Selective copper precipitation: adding a copper precipitation agent to the polluted acid wastewater, stirring for reaction, and solid-liquid separation to obtain copper-rich slag and copper precipitation After liquid; (2) Selective arsenic precipitation: add arsenic precipitation agent to the copper precipitation liquid, stir and react, and separate solid and liquid to obtain arsenic-rich slag and arsenic precipitation liquid; (3) Immersion gold: add arsenic precipitation liquid Add the gold-precipitating agent, stir the reaction, and separate the solid and liquid to obtain the gold-rich slag and the gold-precipitating liquid. The invention settles step by step in strict accordance with the order of copper-arsenic-gold, realizes the recovery of valuable metal copper and gold and the open circuit of harmful elements arsenic and fluorine.

Description

technical field [0001] The invention relates to a method for recovering gold from polluted acid wastewater, and belongs to the technical field of polluted acid wastewater treatment and resource recovery. Background technique [0002] The washing and purification process in the copper smelting flue gas acid production process produces a large amount of acidic wastewater, which is generally called "dirty acid" by smelting enterprises. The polluted acid solution system is very complex, with many components and high concentration, mainly containing high concentrations of sulfate ions, fluoride ions, chloride ions, and high concentrations of arsenic, and a small amount of various metals such as copper, zinc, lead, cadmium, iron, Gold, silver, etc. are a kind of harmful and difficult-to-treat mining and metallurgy industrial wastewater. According to the characteristics of this wastewater, it is of great practical significance to study the treatment technology that can recycle var...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B30/04C22B11/00
CPCC22B7/006C22B11/042C22B15/0089C22B30/04Y02P10/20
Inventor 蒋国民赵次娴岑家山雷吟春刘锐利陈龙廖圆王凯
Owner CHANGSHA SCI ENVIRONMENTAL TECH