Method for removing heavy metals from high-concentration cyanide-containing wastewater in gold production through cyanide breaking

A high-concentration, cyanide wastewater technology, applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of excessive copper ions in workshop discharges, waste of resources, easy to pollute the operating environment, etc., and is conducive to recycling. The effect of treating, reducing the pollution load, and the method is simple and easy to implement

Active Publication Date: 2020-12-18
ZHAOJIN MINING
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The disadvantages of the chlorination method are: 1. If the equipment is not well sealed during the wastewater treatment process, CNCI (cyanogen chloride) will escape into the air and easily pollute the operating environment; 2. Ferrocyanide complexes and ferricyanide complexes cannot be destroyed The cyanide in the solution cannot be removed by forming precipitates, so the total cyanide is relatively high, especially when dealing with the lean liquid of the gold concentrate cyanide plant, because the lean liquid contains high iron, it is difficult to reduce the released cyanide to 0.5 Below mg/L, the total cyanide content is higher; 3. When bleaching powder or bleaching powder is used to treat high-concentration cyanide-containing wastewater, due to the large dosage, the high concentration of chloride ions in the wastewater will form complexes with copper to make the copper exceed the standard
[0005] The disadvantages of the sulfur dioxide-air oxidation method are: one, the sulfur cyanide in the waste water cannot be eliminated, and when treating the waste water containing the sulfur cyanide, the residual toxicity of the waste water is still relatively large; two, the copper ion at the discharge port of the worksho

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The method for breaking cyanide and removing heavy metals in high-concentration cyanide-containing wastewater in gold production of the present embodiment comprises the following steps:

[0043] S1. Flocculation and precipitation: under the condition of 20°C, put 2L of high-concentration cyanide-containing wastewater into the thickener, and add polyaluminum chloride (PAC) for flocculation and precipitation to obtain the first supernatant;

[0044] S2. Electrolysis: overflow the above first supernatant into the electrolytic cell, and remove the heavy metal Cu by electrolysis at pH=4 2+ , the time of electrolysis reaction is 1h, obtain electrolyte;

[0045] S3, a natural precipitation: adjust the above electrolytic solution to the alkalinity of pH=10, put it into a thickener for natural precipitation, the pH of the natural precipitation is 10, and obtain the second supernatant;

[0046]S4, primary cyanide breaking: overflow the above second supernatant to the cyanide bre...

Embodiment 2

[0057] The method for breaking cyanide and removing heavy metals in high-concentration cyanide-containing wastewater in gold production of the present embodiment comprises the following steps:

[0058] Flocculation and precipitation: under the condition of 20°C, pour 50L of high-concentration cyanide-containing wastewater into the thickener, and add polyaluminum chloride (PAC) for flocculation and precipitation to obtain the first supernatant;

[0059] Electrolysis: The above-mentioned first supernatant is overflowed into the electrolytic cell, and the heavy metal Cu is electrolyzed at pH=4 2+ , the time of electrolysis reaction is 1h, obtain electrolyte;

[0060] One-time natural precipitation: adjust the above electrolyte to the alkalinity of pH=10, put it into a thickener for natural precipitation, the pH of the natural precipitation is 10, and obtain the second supernatant;

[0061] Primary cyanide breaking: overflow the above-mentioned second supernatant to the cyanide b...

Embodiment 3

[0072] The method for breaking cyanide and removing heavy metals in high-concentration cyanide-containing wastewater in gold production of the present embodiment comprises the following steps:

[0073] Flocculation and precipitation: under the condition of 20°C, pour 1000L of high-concentration cyanide-containing wastewater into the thickener, and add polyaluminum chloride (PAC) for flocculation and precipitation to obtain the first supernatant;

[0074] Electrolysis: The above-mentioned first supernatant is overflowed into the electrolytic cell, and the heavy metal Cu is electrolyzed at pH=4 2+ , the time of electrolysis reaction is 1h, obtain electrolyte;

[0075] One-time natural precipitation: adjust the above electrolyte to the alkalinity of pH=10, put it into a thickener for natural precipitation, the pH of the natural precipitation is 10, and obtain the second supernatant;

[0076] Primary cyanide breaking: overflow the above-mentioned second supernatant to the cyanide...

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Abstract

The invention relates to a method for removing heavy metals from high-concentration cyanide-containing wastewater in gold production through cyanide breaking, and belongs to the technical field of cyanide-containing wastewater treatment. The method comprises the following steps: S1, flocculent precipitation; S2, electrolysis; S3, primary natural precipitation; S4, primary cyanide breaking; S5, secondary natural precipitation; S6, iron removal; S7, secondary cyanide breaking; and S8, precipitation treatment. Heavy metal solids generated in the electrolysis process can be separated through one-time precipitation, so recovery treatment of heavy metal is facilitated; a third supernatant is subjected to iron removal treatment by using an iron removal catalyst after secondary precipitation, so that the iron element in the cyanide-containing wastewater can be effectively removed, and the pollution load of subsequent secondary cyanide breaking treatment is reduced; and CN<-> which is not treated by primary cyanide breaking can be further removed by adopting secondary cyanide breaking, so that the difficulty of subsequent treatment is reduced. Compared with other methods for removing cyanogen and removing heavy metals, the method has the advantages of being simple and feasible, stable in reaction process and free of secondary pollution.

Description

technical field [0001] The invention relates to the technical field of cyanide-containing wastewater treatment, in particular to a method for breaking cyanide and removing heavy metals from high-concentration cyanide-containing wastewater in gold production. Background technique [0002] Cyanide-containing wastewater is generated during the gold production process, and the cyanide-containing wastewater usually carries heavy metals, especially gold and silver, which are easily discharged along with the wastewater, causing waste of resources. [0003] At present, the main methods for treating high-concentration cyanide-containing waste liquid produced in the gold production process at home and abroad include chlorination, acidification, sulfur dioxide-air oxidation, activated carbon adsorption and precipitation. There are following disadvantages respectively: [0004] The disadvantages of the chlorination method are: 1. If the equipment is not well sealed during the wastewate...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/16C02F101/20C02F101/18
CPCC02F9/00C02F1/5236C02F1/463C02F1/58C02F2101/18C02F2101/20C02F2301/08C02F2103/16Y02P10/20
Inventor 李俊杰李雪林刘娟林健江秀东
Owner ZHAOJIN MINING
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