Cyanated wastewater treatment method

A treatment method and technology for cyaniding wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as excessive waste residue, hidden environmental hazards, and secondary pollution, and achieve The process flow is simple, the system runs stably, and the treatment effect is good.

Active Publication Date: 2014-11-05
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the use of cyanide gold extraction process in the production process of gold mines, a large amount of cyanide wastewater will be produced. This part of cyanide wastewater not only contains a certain amount of highly toxic cyanide, but also contains thiocyanate, COD, copper, and zinc. , lead and other heavy metal ions, if not effectively treated, will cause major environmental hazards
At present, the methods commonly used at home and abroad to treat cyanide wastewater include acidification recovery method, alkali chlorine method, Inco method, sulfur dioxide method, etc. Although the acidification recovery method can recover a certain amount of cyanide, due to the incomplete recovery of cyanide, the wastewater A certain amount of cyanide will remain in the medium, and at the same time, thiocyanate and some heavy metal io

Method used

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Examples

Experimental program
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Example Embodiment

[0026] Specific example 1:

[0027] Cyanide wastewater from a gold mine, pH 9.6, CN T 526.57mg / L, SCN—15.35mg / L, Cu 2+ It is 112.72mg / L, COD is 204.25mg / 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 an electrolytic tank for electrolysis. The electrolytic tank is a rectangular tank with three graphite anodes in parallel. 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. The stirring line speed is 0.8m Slowly add 3mL of 10% zinc sulfate solution under the condition of 10% / s, react for 5min, add 8mL of 10g / L polyaluminum chloride ...

Example Embodiment

[0028] Specific example 2:

[0029] Cyanide wastewater from a gold mine, pH 9.2, CN T 445.23mg / L, SCN — 16.69mg / L, Cu 2+ 48.55mg / L, Pb 2+ It is 8.75mg / L, COD is 119.65mg / 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 NaCl solution with a concentration of 30%, turn on the stirring device, stir well and place the waste water in an 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. Slowly add 2mL of 10% zinc sulfate solution under 0.8m / s, react for 5min, add 8mL of 10g / L polyaluminu...

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PUM

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Abstract

The invention discloses a cyanated wastewater treatment method. The method consists of three steps, namely the step of carrying out electrochemical treatment, the step of carrying out coagulative precipitation treatment and the step of carrying out ozone/activated-charcoal catalytic oxidation treatment, wherein tractable cyanide is firstly removed by adopting an electrochemical treatment method, then, coagulative precipitation is carried out through adding a zinc sulfate solution and a coagulation agent, so as to remove metal cyanide complexes and heavy metal ions from the wastewater, and finally, pollutants, which are difficultly removed by chemical methods and coagulative precipitation, are removed from the wastewater by an ozone/activated-charcoal catalytic oxidation treatment system through the synergism of ozone and activated charcoal. According to the method, based on the characteristic that pollutants contained in the cyanated wastewater of gold mines are complicated and intractable, an electrochemical treatment technology, a coagulative precipitation technology and an ozone/activated-charcoal catalytic oxidation technology are combined together and carry out deep treatment on the cyanated wastewater of the gold mines in a synergistic manner, thus, the treatment effect is good, the treatment efficiency is high, the system operation is stable, the process flow is simple, the realization of industrial application is facilitated, and the treated wastewater can be returned to the production process flow and used as reclaimed water or be discharged in a standardized manner.

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 gold mine cyanidation wastewater. Background technique [0002] Due to the use of cyanide gold extraction process in the production process of gold mines, a large amount of cyanide wastewater will be produced. This part of cyanide wastewater not only contains a certain amount of highly toxic cyanide, but also contains thiocyanate, COD, copper, and zinc. , lead and other heavy metal ions, if not effectively dealt with, will produce major environmental hazards. At present, the methods commonly used at home and abroad to treat cyanide wastewater include acidification recovery method, alkali chlorine method, Inco method, sulfur dioxide method, etc. Although the acidification recovery method can recover a certain amount of cyanide, due to the incomplete recovery of cyanide, the wastewater There will be a certain amount of ...

Claims

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Application Information

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IPC IPC(8): C02F9/06
Inventor 刘强李哲浩
Owner CHANGCHUN GOLD RES INST
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