Method for treating ferricyanic gold extraction wastewater by using precipitation-electrolytic oxidation synergistic effect

A technology of electrolytic oxidation and synergy, applied in the fields of precipitation treatment, flocculation/sedimentation water/sewage treatment, metallurgical wastewater treatment, etc., can solve the problems of high cost, difficulty in reaching the standard of effluent, and imperfect technology, and achieve low cost and operation. Simple, high removal efficiency

Inactive Publication Date: 2018-11-20
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the actual application of my country's gold enterprises is limited to the alkali chlorine method, sulfur dioxide-air method and acidification method, and because these

Method used

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  • Method for treating ferricyanic gold extraction wastewater by using precipitation-electrolytic oxidation synergistic effect

Examples

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Effect test

Embodiment 1

[0022] refer to figure 1 , a method of utilizing precipitation-electrolytic oxidation synergy to treat high-ferricyanide gold extraction wastewater, the steps are as follows:

[0023] 1. Put the cyanidation gold extraction wastewater in the high-level reaction tank 1 with mechanical agitation, add the precipitant cupric chloride with 1% of the wastewater mass, stir to carry out the precipitation reaction, and ferricyanide complex ions combined with strong bonds and some weak Bonded complex ions are transformed into precipitates.

[0024] 2. After the precipitation reaction, the reactant is sent to the settling tank 21 by the pump 51 for precipitation and separation. After the separation, the supernatant is passed into the electrolytic cell 3 by the pump 52, and the stainless steel plate is used as the anode and cathode for electrolytic oxidation. The stabilized power supply is 6 Provide an electrolysis voltage of 4.0V, the distance between the plates is 10mm, and the electrol...

Embodiment 2

[0027] A method utilizing precipitation-electrolytic oxidation synergy to process high ferricyanide gold extraction wastewater adopts the same device as in Example 1, and the steps are as follows:

[0028] 1. Put the cyanidation gold extraction wastewater in a high-level tank with mechanical agitation, add 3.5% of the wastewater mass as a precipitant cuprous chloride, stir for precipitation reaction, and ferricyanide complex ions combined with strong bonds and some weak bonds Combined complex ions are transformed into precipitates.

[0029] 2. Separate the precipitate obtained in step 1. After the separation, the supernatant is passed into the electrolytic cell, and the titanium plate is used as the cathode and anode for electrolytic oxidation. The electrolysis voltage is 10V, the distance between the plates is 10mm, and the electrolysis time is 2h. The combined free cyanide, zinc cyanide, and copper cyanide complex ions are oxidized to nitrogen and carbon dioxide under the sy...

Embodiment 3

[0031] A method utilizing precipitation-electrolytic oxidation synergy to process high ferricyanide gold extraction wastewater adopts the same device as in Example 1, and the steps are as follows:

[0032] 1. Put the cyanidation gold extraction wastewater in a high-level tank with mechanical agitation, add 2% of the wastewater mass as a precipitant copper chloride, stir for precipitation reaction, and combine ferricyanide complex ions with strong bonds and some weak bonds Complex ions are transformed into precipitates.

[0033] 2. Separate the precipitate obtained in step 1. After the separation, the supernatant is passed into the electrolytic cell, and the titanium plate is used as the cathode and anode for electrolytic oxidation. The electrolytic voltage is 5V, the distance between the plates is 10mm, and the electrolysis time is 4h. The residual weak bonds in the wastewater The combined free cyanide, zinc cyanide, and copper cyanide complex ions are oxidized to nitrogen and...

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Abstract

Theinvention discloses a method for treating ferricyanic gold extraction wastewater in a gold smelting plant by using a precipitation-electrolytic oxidation synergistic effect. The method comprises the following steps: firstly, introducing the wastewater into a high-position tank or reactor with a stirring function, adding copper chloride or cuprous chloride to perform precipitation reaction, andconverting iron-cyanide ions and a part of free cyanide and zinc cyanide ions into composite precipitation; and introducing supernatant after reaction into an electrolytic cell, and performing electrolytic oxidation reaction with certain voltage by using a titanium plate or stainless steel plate as positive and negative electrodes so as to enable remaining free cyanide, zinc cyanide and copper cyanide ions in the wastewater to be oxidized to nitrogen and carbon dioxide under the synergistic effect of positive electrode oxidation and chlorine gas or hypochlorite generated in the reaction of chlorine ions, and performing electrolytic deposition on copper and zinc at the negative electrode, wherein the wastewater after treatment can return to mineral separation or leaching systems to be circularly used. Copper chloride or cuprous chloride is not only used as a precipitator, but also used as the source of an oxidizer. The method has the characteristics of being simple in treatment process,short in flow process, low in cost and good in treatment effect and has the great significance on deep treatment and comprehensive utilization of cyanide wastewater containing iron ions with high concentration.

Description

technical field [0001] The invention belongs to the technical field of cyanide-containing wastewater treatment in the metallurgical industry, and in particular relates to a method for treating high-ferricyanide gold extraction wastewater by utilizing the synergistic effect of precipitation and electrolytic oxidation. Background technique [0002] Due to repeated use, free cyanide and a large amount of copper, iron and zinc cyanide complex ions are enriched in cyanide gold extraction wastewater. Among these ions, copper and zinc cyanide complex ions are weak and healthy complex ions, which are easy to be extracted. Oxidants are oxidized to non-toxic or low-toxic substances, but ferricyanide complex ions are strong complex ions, and it is difficult to effectively treat them by conventional oxidation methods and electrolysis methods. In the present invention, copper chloride is firstly used to precipitate strongly bonded ferricyanide complex ions, and then the synergistic effec...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F101/18C02F103/16
CPCC02F1/001C02F1/46109C02F1/4672C02F1/52C02F9/00C02F2001/007C02F2001/46133C02F2101/18C02F2103/16
Inventor 宋永辉赵玲玲陈瑶周军
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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