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Cyanide-containing wastewater purification and cyanide recovering device and recovering method

A recovery method and recovery device technology, applied in the direction of metal cyanide, chemical instruments and methods, simple alkali metal cyanide, etc., can solve problems such as safety, achieve the effect of shortening the process flow, shortening the reaction time, and avoiding the risk of leakage

Inactive Publication Date: 2019-07-12
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a cyanide-containing wastewater purification and cyanide recovery device and recovery method to solve the safety problems existing in the traditional acidification method

Method used

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  • Cyanide-containing wastewater purification and cyanide recovering device and recovering method
  • Cyanide-containing wastewater purification and cyanide recovering device and recovering method

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example 1

[0032] Cyanide-containing wastewater from a gold mine, pH 11.8, CN f 3674.02mg / L, SCN - 12918.26mg / L, Cu 2+ 2138.06mg / L, Zn 2+ It is 808mg / L. The waste water is treated by the steps of the present invention, and the pH of the acidizing solution is controlled to be 1.5. When the circulation ratio of the acidifying solution (the flow rate of the circulating liquid and the flow rate of the incoming liquid) is 1:1, that is, the reaction time is 1h, and the acidifying solution CN f to 710.87mg / L, continue to increase the acidizing solution circulation ratio to 2:1, that is, the reaction time is 2h, the acidifying solution CN f 103.56mg / L, SCN - 5961.74mg / L, Cu 2 + 4.60mg / L, Zn 2+ 0.21mg / L. After the acidification liquid is separated from the solid and liquid after treatment, the copper grade in the acidification slag is 25.65%. The liquid is neutralized and then returned to the cyanide section for recycling. At the same time, HCN in the tail gas is not detected, and the abso...

example 2

[0035] Cyanide-containing wastewater from a gold mine, pH 10.7, CN f 749.27mg / L, SCN - 2251.59g / L, Cu 2+ 406.98mg / L, Zn 2+ It is 190.00mg / L. The waste water is treated through the above steps, and the pH of the acidizing solution is controlled to be 1.5. When the circulation ratio of the acidifying solution (the flow rate of the circulating liquid and the flow rate of the influent liquid) is 2:1, that is, the reaction time is 2 hours, and the acidifying solution CN f 103.56mg / L, SCN - 1289.78mg / L, Cu 2+ 1.60mg / L, Zn 2+ The copper grade in the acidified slag is 0.12mg / L. After the treatment, the acidified liquid is separated from the solid and liquid, and the copper grade in the acidified slag is 21.22%.

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Abstract

The invention relates to a cyanide-containing wastewater purification and cyanide recovering device and a recovering method and belongs to the technical field of environmental protection. A cyanide-containing wastewater storage tank is connected with a heater connected with an acidification reactor; a sulfuric acid storage tank is connected with the acidification reactor; an acidizing fluid circulating pump is connected with the bottom and the upper part of the acidification reactor, the top of the acidification reactor is connected with a jet device, a centrifugal pump is connected with the bottom of an absorption tower and connected with the jet device, a pipeline connected with the jet device is inserted into the bottom of the absorption tower, and an absorption liquid circulating pumpis connected with the bottom and the upper part of the absorption tower; the acidification reactor and an efficient thickening device are connected through an acidizing fluid discharging pump; the bottom of the efficient thickening device is connected with a filtering device through a slurry pump; the upper part of the efficient thickening device and the filtering device are connected with a neutralization reactor. The device and the method have the advantages that the treatment effect is good, the treatment efficiency is high, system operation is stable, industrial application is convenient to realize, and treated wastewater can be returned to a production technological process to be used as reclaimed water.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for purifying medium and high-concentration cyanide-containing wastewater and recovering cyanide in the gold industry. Background technique [0002] At present, the gold industry generally adopts cyanide gold extraction process, which will produce a large amount of cyanide-containing wastewater. In order to achieve clean production, improve the utilization rate of water resources, meet environmental protection requirements and reduce the impact on the surrounding environment such as rivers, production enterprises generally use cyanide system closed-circuit recycling of cyanide-containing wastewater, but after long-term circulation, the accumulation of impurity ions is serious, especially copper cyanide Concentrations of complex ions, (sub)ferricyanide complex ions, thiocyanate, etc. continue to increase, which has adverse effects on the entire cyanide sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C01C3/10C02F101/18C02F103/16
CPCC01C3/10C02F1/58C02F2101/18C02F2103/16
Inventor 孟凡钰李哲浩朱军章刘金凤崔崇龙叶锦娟
Owner CHANGCHUN GOLD RES INST
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