Method for treating cyanide-containing wastewater in gold cyaniding enterprises

A treatment method and technology for cyanide wastewater, which is applied in metallurgical wastewater treatment, oxidized water/sewage treatment, electrochemical water/sewage treatment, etc., can solve problems such as excessive waste residue, secondary pollution, and environmental protection hazards, and achieve stable system operation. Ease of industrial application and simple process flow

Active Publication Date: 2015-01-07
CHANGCHUN GOLD RES INST
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Problems solved by technology

[0002] Gold cyanide enterprises will produce a large amount of cyanide-containing wastewater due to the use of cyanide gold extraction process in the process of gold beneficiation. This part of cyanide-containing wastewater not only contains a certain amount of highly toxic cyanide, but also contains thiocyanate and copper Heavy metal ions such as zinc, lead, etc., if not effectively treated, will cause major environmental hazards
At present, the methods commonly used at home and abroad to treat cyanide-containing wastewater include acidification recovery method, alkali chlorine method, Inco method, sulfur dioxide method, etc. Although a certain amount of cyanide can be recovered by using acidification recovery method, due to the incomplete recovery of cyanide, the waste water A certain amount of cyanide will remain in the medium, and at the same time, thiocyanate and some heavy

Method used

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Examples

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Example Embodiment

[0029] Specific example 1:

[0030] Cyanide-containing wastewater from a gold mine, pH 9.6, CN T 226.25mg / L, SCN — 78.24mg / L, Cu 2+ 65.86mg / L, Fe 3+ It is 7.26mg / L, COD is 214.28mg / L, and it also contains traces of other heavy metal ions. Take 3L of waste water and place it in a stirring tank, add 5 mL of 30% NaCl solution, turn on the stirring device, stir thoroughly and place the waste water in an electrolytic tank for electrolysis. The electrolytic tank is a rectangular tank with three parallel One graphite anode plate and three stainless steel cathode plates. The anode plate is connected in series to the positive pole of the DC power supply, and the anode plate is connected in series to the positive pole of the DC power supply. After 120 minutes of electrolysis treatment, the wastewater is transferred to the stirring tank, and the stirring is turned on. Under the condition of 0.8m / s, add 10mL of 30% hydrogen peroxide solution and 0.5mL of copper sulfate solution of 5% by mas...

Example Embodiment

[0031] Specific example 2:

[0032] Cyanide-containing wastewater from a gold mine, pH 10.5, CN T 365.54mg / L, SCN — 43.65mg / L, Cu 2+ 26.62mg / L, Pb 2+ It is 8.37mg / L, COD is 135.45mg / L, and also contains traces of other heavy metal ions. Take 3L of waste water and place it in a stirring tank, add 5 mL of 30% NaCl solution, turn on the stirring device, stir well and place the waste water in the electrolytic tank for electrolysis treatment. The electrolytic tank is a rectangular tank with three parallel blocks inside. Graphite anode plate and three stainless steel cathode plates. The anode plate is connected in series to the positive pole of the DC power supply, and the anode plate is connected in series to the positive pole of the DC power supply. After 120 minutes of electrolysis treatment, the wastewater is moved into the stirring tank, and the stirring is turned on. Under the condition of 0.8m / s, add 15mL 30% hydrogen peroxide solution and 0.8mL copper sulfate solution with 5% ...

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Abstract

The invention discloses a method for treating cyanide-containing wastewater in gold cyaniding enterprises. The method comprises the four steps of electrochemical treatment, chemical oxidation treatment, coagulating sedimentation treatment and biological activated carbon treatment. When the cyanide-containing wastewater is treated, cyanide is electrolyzed by adopting the electrochemical treatment method; coagulating sedimentation is carried out by adding a coagulating agent, and heavy metal pollutants in wastewater can be removed; precipitated wastewater is oxidized by adding a chemical reagent; and finally, pollutants which are hardly removed from wastewater by a chemical method are removed by adopting a biological and physical adsorption method through a biological activated carbon treatment system. According to the method, the four steps are combined together according to the characteristics of complex and hardly treated pollutants in cyanide-containing wastewater of gold production enterprises, and are synergized to carry out deep treatment on the cyanide-containing wastewater of gold production enterprises. The method has the advantages of good treatment effect, high treatment efficiency, stable system operation and simple process flow, and can easily realize industrial application, and the treated wastewater can be returned to a production process flow to be used as reclaimed water or discharged with standard level.

Description

technical field [0001] The invention relates to a pollutant treatment method in the field of environmental protection, in particular to a treatment method for cyanide-containing wastewater of a gold cyanidation enterprise. Background technique [0002] Gold cyanide enterprises will produce a large amount of cyanide-containing wastewater due to the use of cyanide gold extraction process in the process of gold beneficiation. This part of cyanide-containing wastewater not only contains a certain amount of highly toxic cyanide, but also contains thiocyanate and copper Heavy metal ions such as zinc, lead, etc., if not effectively treated, will cause major environmental hazards. At present, the methods commonly used at home and abroad to treat cyanide-containing wastewater include acidification recovery method, alkali chlorine method, Inco method, sulfur dioxide method, etc. Although a certain amount of cyanide can be recovered by using acidification recovery method, due to the in...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/18C02F103/16
CPCC02F1/46C02F1/52C02F1/72C02F3/106C02F9/00C02F2101/18C02F2103/16
Inventor 刘强李哲浩
Owner CHANGCHUN GOLD RES INST
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