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Method for treating cyanide-containing wastewater by complexation-ion flotation process

A cyanide wastewater, flotation technology, applied in flotation water/sewage treatment, water/sewage treatment, metallurgical wastewater treatment, etc. The effect of less amount, high enrichment ratio and low energy consumption

Active Publication Date: 2020-01-03
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the current problems of high toxicity, serious pollution, complicated treatment and high cost of cyanide-containing wastewater, the present invention proposes a new method for treating cyanide-containing wastewater by ion flotation

Method used

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  • Method for treating cyanide-containing wastewater by complexation-ion flotation process

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A kind of complexation-ion flotation method is processed the method for cyanide-containing waste water, and concrete process is as follows:

[0023] (1) First, mix CuCl and ethylenediamine in a molar ratio of 1:1, and stir for 15 minutes;

[0024] (2) Take cyanide-containing wastewater with a cyanide ion concentration of 2 mol / L and a pH of 9-10, adjust the pH of the solution to 4.0 with 5wt% dilute hydrochloric acid, and stir for 15 minutes;

[0025] (3) Next, add the mixture in step 1) according to the molar ratio of cuprous ions and cyanide ions as 1:2, and then stir and react for 30 minutes;

[0026] (4) Subsequently, add a certain amount of CTAB to the solution in step 3), control the concentration of CTAB in the mixed solution to 10.0 mg / L, and keep stirring for 3 minutes; finally, when the aeration volume is 0.6L / min and the flotation time is After 5 minutes, the turbidity of the tail liquid was measured to be 4.1NTU, the concentration of cyanide ions in the tai...

Embodiment 2

[0028] A kind of complexation-ion flotation method is processed the method for cyanide-containing waste water, and concrete process is as follows:

[0029] (1) First, mix CuCl and ethylenediamine at a molar ratio of 1:2, and stir for 30 minutes;

[0030] (2) Take cyanide-containing wastewater with a cyanide ion concentration of 70 mol / L and a pH of 9-10, adjust the pH of the solution to 5.0 with 5wt% dilute hydrochloric acid, and stir for 25 minutes;

[0031] (3) Next, add the mixture in step 1) according to the molar ratio of cuprous ions and cyanide ions as 1:3, and stir for 45 minutes;

[0032] (4) Subsequently, add a certain amount of CTAB to the solution in step 3), control the concentration of CTAB in the mixed solution to 80.0 mg / L, and keep stirring for 3 minutes; finally, when the aeration volume is 1.1L / min and the flotation time is After 8 minutes, the turbidity of the tail liquid was measured to be 3.4NTU, the removal rate of cyanide ions was 99.80%, and the resid...

Embodiment 3

[0034]A kind of complexation-ion flotation method is processed the method for cyanide-containing waste water, and concrete process is as follows:

[0035] (1) First, mix CuCl and ethylenediamine at a molar ratio of 1:3, and stir for 30 minutes;

[0036] (2) Take cyanide-containing wastewater with a cyanide ion concentration of 120 mol / L and a pH of 9-10, adjust the pH of the solution to 7.0 with 5wt% dilute hydrochloric acid, and stir for 15 minutes; Add the mixture in step 1) at a ratio of 1:4, and stir for 30 minutes;

[0037] (3) Subsequently, add a certain amount of CTAB to the solution in step 2), control the concentration of CTAB in the mixture to 100mg / L, and keep stirring for 3 minutes;

[0038] (4) Finally, under the conditions of 0.6L / min air filling and 5min flotation time, the measured turbidity of the tail liquid was 5.3NTU, the removal rate of cyanide ions was 99.87%, and the residual cyanide ions in the tail liquid The concentration was 4.1 mg / L, which reached...

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Abstract

The invention discloses a method for treating cyanide-containing wastewater by a complexation-ion flotation process. The method includes the following steps: firstly, mixing Cu<+> and ethylenediamineaccording to a certain molar ratio, and performing a reaction under stirring; subsequently, adding the mixed liquid into the cyanide-containing wastewater, and performing a reaction under stirring; then, adding a certain concentration of cetyltrimethylammonium bromide (CTAB), and performing a reaction under stirring; and finally, pouring the mixed solution into a flotation column, performing aeration flotation, and enabling a chelate containing cyanide ions to float upwards along with bubbles to be accumulated at the upper layer of the solution, so as to realize separation of the cyanide ionsfrom the water, wherein after treatment, the concentration of residual cyanide ions in the solution is lower than 10.0 ppm, and meets an industrial wastewater recycling standard. The method has the advantages of simple operation, a small occupied area, low energy consumption, a high enrichment ratio, and a small amount of sludge, and has certain industrial value and social benefits.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a method for treating cyanide-containing wastewater by complexation-ion flotation. Background technique [0002] Cyanide gold extraction is a traditional gold extraction process, and the cyanide wastewater produced during the leaching process contains free hydrogen ions CN - , copper cyanide complex Cu(CN) 4 3- 、Cu(CN) 3 2- or Cu(CN) 2 - , Zinc cyanide complex Zn(CN) 4 2- , ferricyanide complex Fe(CN) 6 4- or Fe(CN) 6 3- and thiocyanate (SCN - ), etc., with complex composition and various metals. If the cyanide wastewater is not discharged and directly discharged into the river, it will cause serious pollution to the environment and cause human and animal poisoning. [0003] Since the ion flotation technology was proposed by Professor Sebba in the late 1950s, it has been widely developed in the fields of mining engineering, hydrometallurgy, wastewater t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/54C02F9/04C02F101/18C02F103/16
CPCC02F1/5236C02F1/54C02F1/24C02F2101/18C02F2103/16
Inventor 彭伟军曹亦俊李超黄宇坤韩桂洪范桂侠黄艳芳贾凯柴文翠
Owner ZHENGZHOU UNIV