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Harmless treatment method for cyanide-containing and heavy metal-containing wastewater in gold smelting

A harmless treatment, heavy metal technology, applied in the direction of metallurgical wastewater treatment, metal cyanide, water/sewage treatment, etc., can solve the problems of large water quality fluctuations, complex treatment process, not simple enough operation, etc., to achieve easy automatic control , good safety and controllability, and strong process adaptability

Pending Publication Date: 2021-02-12
YUNNAN GOLD MINING GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of sulfuric acid used in this method is large, and HCN gas is highly toxic, so it must be carefully sealed. The resin bed may be blocked by metal deposits, and the investment cost is relatively high.
In summary, the existing chemical methods use a large number of various chemical agents, which makes the treatment process complicated, high cost, and improper dosage may cause secondary pollution. In addition, the existing chemical methods are not simple enough to operate Stable, great impact on fluctuations in water quality, lack of operational flexibility, and the drainage often fails to meet the standard when treating wastewater

Method used

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  • Harmless treatment method for cyanide-containing and heavy metal-containing wastewater in gold smelting
  • Harmless treatment method for cyanide-containing and heavy metal-containing wastewater in gold smelting

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preparation example Construction

[0037] (2) Preparation of precipitant solution. Transfer a certain amount of prepared copper sulfate solution to the preparation tank A; at the same time, add a certain amount of alkali, such as sodium hydroxide or sodium carbonate, to the prepared sodium sulfite solution to adjust the solution to alkaline, and control the pH = 9~10, and then transported to the preparation barrel A by a pump, and reacted with the copper sulfate solution. In this process, the amount of sodium sulfite, according to the chemical reaction equation 2Cu 2+ +SO 3 2- +2OH - =2Cu + +SO 4 2- +H 2 After the theoretical amount is calculated, the addition control is carried out at 1.1 to 1.3 times the theoretical amount to obtain a cuprous solution precipitant;

[0038] A certain amount of gold smelting wastewater containing cyanide and heavy metals is transported to the reaction tank B, and then the cuprous solution prepared according to the above step (2) is pumped into the reaction tank B to rea...

Embodiment 1

[0051] A gold smelting waste water containing cyanide and heavy metals, the pH of the solution is about 9~10, the analysis results of the main harmful elements are: 1768.58mg / L total cyanide, 150.45mg / L free cyanide, 1626.85mg / L copper, 1626.85mg / L copper, Iron 0.45mg / L, also contains a certain amount of calcium, magnesium and other elements.

[0052] Adopt the present invention to implement this gold smelting wastewater containing cyanide and heavy metals, and the technical scheme includes:

[0053] (1) Detection of total cyanide and heavy metal content in gold smelting wastewater. Take a certain amount of wastewater containing cyanide and heavy metals from gold smelting to be treated, and measure the contents of cyanide, copper, zinc, iron and other elements respectively;

[0054] (2) Preparation of precipitant solution. Transfer a certain amount of prepared copper sulfate solution to the preparation tank A; at the same time, add a certain amount of alkali, such as sodium ...

Embodiment 2

[0067] A gold smelting waste water containing cyanide and heavy metals. The pH of the solution is about 9~10. The analysis results of the main harmful elements are: 2477.65 mg / L of total cyanide, 180.27 mg / L of free cyanide, 2305.36 mg / L of copper, and 2305.36 mg / L of copper. Iron 0.57mg / L, also contains a certain amount of calcium, magnesium and other elements.

[0068] Adopt the present invention to implement this gold smelting wastewater containing cyanide and heavy metals, and the technical scheme includes:

[0069] (1) Detection of total cyanide and heavy metal content in gold smelting wastewater. Take a certain amount of wastewater containing cyanide and heavy metals from gold smelting to be treated, and measure the contents of cyanide, copper, zinc, iron and other elements respectively;

[0070] (2) Preparation of precipitant solution. Transfer a certain amount of prepared copper sulfate solution to the preparation tank A; at the same time, add a certain amount of alk...

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Abstract

The invention relates to a harmless treatment method for cyanide-containing and heavy metal-containing wastewater in gold smelting, and belongs to the field of hydrometallurgy. The method comprises the following steps: (1) measuring the content of elements such as cyanide, copper, zinc, iron and the like in the gold smelting wastewater; (2) preparing a precipitant solution; (3) reacting the gold smelting wastewater containing cyanogen and heavy metals with a cuprous solution to generate precipitate, and then concentrating and filtering; (4) purifying a CuCN-containing solid phase; (5) carryingout CuCN-containing solid-phase conversion and recycling sodium cyanide; and (6) after CuCN is completely converted into Cu2S precipitate, adding an alkaline solution, controlling the pH value to be11-12, filtering and washing to obtain a Cu2S solid phase and an alkaline sodium cyanide solution, taking Cu2S as a copper concentrate product, and recycling the alkaline sodium cyanide solution. Theinnocent treatment method for the cyanide-containing and heavy metal-containing waste water in gold smelting is simple in technological process, low in energy consumption, free of waste residue generation, easy to control in operation, free of secondary pollution, safe, controllable and high in adaptability, and resources are recycled.

Description

technical field [0001] The invention relates to a harmless treatment method for waste water containing cyanide and heavy metals in gold smelting, which belongs to the field of hydrometallurgy and relates to the technical field of treatment of waste water containing cyanide and heavy metals produced in the process of gold smelting. Background technique [0002] The invention relates to a harmless treatment method for waste water containing cyanide and heavy metals in gold smelting, which belongs to the field of hydrometallurgy and relates to the technical field of treatment of waste water containing cyanide and heavy metals produced in the process of gold smelting. At present, gold smelting mainly adopts the process of cyanide leaching to extract gold. In the production process, in order to save water, avoid environmental pollution, improve safety and controllability, and strive to maximize the utilization rate of backwater. Most gold companies generally return the leachate t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01C3/08C01C3/10C01G3/12C02F101/18C02F101/20C02F103/16
CPCC02F9/00C01C3/08C01G3/12C01C3/10C02F2101/18C02F2101/20C02F2103/16C02F1/001C02F1/5236C02F1/66C02F2001/007
Inventor 段胜红高起方姜亚雄谢恩龙
Owner YUNNAN GOLD MINING GRP
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