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High-concentration cyanide-containing wastewater resource recovery and intermediate product treatment method

A resource recovery and treatment method technology, which is applied in the field of high-concentration cyanide-containing wastewater resource recovery and intermediate product treatment, can solve the problems of increasing the difficulty and cost of wastewater treatment, affecting the cyanidation process, etc., and achieves significant environmental and social benefits. Effects of low price and reduced environmental risk

Pending Publication Date: 2020-12-04
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High concentrations of heavy metals in cyanide-containing wastewater will affect the cyanidation process indicators, while increasing the difficulty and cost of wastewater treatment

Method used

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  • High-concentration cyanide-containing wastewater resource recovery and intermediate product treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This cyanide-containing wastewater contains heavy metals such as cyanide, thiocyanate and copper, iron, etc. of higher concentration, wherein the total cyanide concentration is 2540mg / L, the thiocyanate concentration is 4210mg / L, and the copper ion concentration is 830mg / L. The iron ion concentration is 550mg / L, and the treatment steps are as follows:

[0029] (1) Recovery and recycling of valuable substances in wastewater

[0030] 1) adding hydrochloric acid to the cyanide-containing wastewater, fully reacting, adjusting the pH value to 3.5, fully reacting until no sediment is generated, filtering and intercepting the treated wastewater to produce tailings 1 and treatment solution 1;

[0031] 2) The moisture content of tailings 1 is 45%, and the copper content in tailings 1 is 28%;

[0032] 3) Sodium hydroxide solution is used to absorb the gas generated in the reaction process to generate a high-concentration sodium cyanide solution, which is recycled in the cyanide ...

Embodiment 2

[0041] This cyanide-containing wastewater contains heavy metals such as cyanide, thiocyanate and copper, iron, etc. of higher concentration, wherein the total cyanide concentration is 7250mg / L, the thiocyanate concentration is 2800mg / L, and the copper ion concentration is 2100mg / L. Iron ion concentration is 1670mg / L. The processing steps are as follows:

[0042] (1) Recovery and recycling of valuable substances in wastewater

[0043] 1) Add sulfuric acid to the cyanide-containing wastewater, fully react, adjust the pH value to 2.2, fully react until no sediment is generated, and carry out gravity sedimentation to the treated wastewater to produce tailings 1 and treatment solution 1;

[0044] 2) The moisture content of the tailings 1 is 48%, and the copper content in the tailings 1 is 37%;

[0045] 3) The milk of lime solution is used to absorb the gas generated in the reaction process to generate a high-concentration calcium cyanide solution, which is recycled in the cyanide...

Embodiment 3

[0054] The cyanide-containing wastewater contains relatively high concentrations of cyanide and heavy metals such as copper, iron, and zinc, among which the total cyanide concentration is 2480mg / L, the copper ion concentration is 340mg / L, the iron ion concentration is 670mg / L, and the zinc ion concentration is 300mg / L, the processing steps are as follows:

[0055] (1) Recovery and recycling of valuable substances in wastewater

[0056] 1) Add nitric acid to the cyanide-containing wastewater, fully react, adjust the pH value to 4.5, and fully react until no sediment is generated. centrifuging the treated wastewater to produce tailings 1 and treatment liquid 1;

[0057] 2) The moisture content of the tailings 1 is 42%, and the copper content in the tailings 1 is 17%.

[0058] 3) The calcium carbide slag emulsion is used to absorb the gas generated during the reaction process to generate a high-concentration calcium cyanide solution, which is recycled in the cyanide leaching p...

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Abstract

The invention relates to a high-concentration cyanide-containing wastewater resource recovery and intermediate product treatment method, and belongs to a resource utilization method in the field of environmental protection. Aiming at cyanide-containing wastewater containing high-concentration cyanide and heavy metals, valuable substances such as cyanide, copper and iron are recycled by adopting achemical method, neutralization and impurity removal are carried out, finally, solid-liquid separation is carried out by adopting a physical method, treated tail liquid and recycled absorption liquidcontaining high-concentration cyanide are recycled for a cyaniding process, and tailings containing the valuable substances are subjected to impurity removal, so that the cyanide-containing wastewateris obtained. And the requirement of comprehensive utilization of resources is met. The method has the advantages that the concentrations of cyanide and heavy metals in the treated cyanide-containingwastewater are relatively low, cyaniding process indexes are not influenced during cyclic utilization, and valuable substances such as cyanide, copper and iron in the cyanide-containing wastewater arerecycled; the intermediate products are harmless and recycled, so that the requirements of legally selling the intermediate products as production raw materials or comprehensively utilizing the intermediate products after further refining are met, and the environmental risk during stockpiling is reduced.

Description

technical field [0001] The invention relates to a resource utilization method in the field of environmental protection, in particular to a resource recovery and intermediate product treatment method for high-concentration cyanide-containing wastewater. Background technique [0002] Cyanide gold extraction technology has been the main method used in my country's gold industry for many years. The cyanide-containing wastewater finally produced by the cyanide process generally contains relatively high concentrations of cyanide and heavy metals, and cyanide and heavy metals exist in the form of complexes. Most of the cyanide-containing wastewater is recycled, and a small part is discharged after treatment. High concentrations of heavy metals in cyanide-containing wastewater will affect the cyanidation process indicators, while increasing the difficulty and cost of wastewater treatment. According to statistics, there are more than 20 methods for treating cyanide-containing wastew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/13C02F11/10B01D53/78B01D53/54C02F101/18C02F101/20C02F103/16
CPCC02F1/66C02F1/5236C02F11/13C02F11/10B01D53/78B01D53/54C02F2301/08C02F2103/16C02F2101/20C02F2101/18B01D2257/408
Inventor 迟崇哲降向正刘影邱陆明朱军章王莹丁成
Owner CHANGCHUN GOLD RES INST
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