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A method for removing (sub) ferricyanide complex

A technology of ferricyanide complexes and cyanide complexes, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems affecting production indicators, etc., to solve environmental hazards, process Simple process and good processing effect

Active Publication Date: 2017-07-28
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this part of the metal cyanide complex is not treated, if the wastewater is reused, it will affect the production index, and if it is discharged, there will be a major environmental protection hazard

Method used

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Examples

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Effect test

specific example 1

[0024] Cyanide-containing wastewater from a gold mine, pH 7.1, CN T It is 62.96mg / L, Fe is 20.39mg / L, and also contains traces of other heavy metal ions. Take 2L of wastewater and place it in a closed container equipped with a stirring system and a heating system, turn on the stirring system, and add 10% Na under the condition of a stirring linear speed of 2m / s 2 -20ml of EDTA solution, add phosphoric acid with a density of 1.69g / ml to the pH of the wastewater to be 1.5, turn on the heating system, and heat the highest temperature to 100℃, add a duct at the outlet to introduce the gas into sodium hydroxide or other lye for absorption, and react 40min, stop heating and stirring. After the wastewater is treated, CN T <0.1mg / L, which is lower than the discharge value of the comprehensive sewage discharge standard.

specific example 2

[0026] Cyanide-containing wastewater from a gold mine, pH 6.5, CN T It is 112.34mg / L, Fe is 34.41mg / L, and it also contains traces of other heavy metal ions. Take 2L of wastewater and place it in a closed container equipped with a stirring system and a heating system, turn on the stirring system, and add 10% Na under the condition of a stirring linear speed of 2m / s 2 -35ml of EDTA solution, add phosphoric acid with a density of 1.69g / ml to the wastewater pH value of 1.5, turn on the heating system, heat the highest temperature to 100℃, add a duct at the outlet to introduce the gas into sodium hydroxide or other lye for absorption and reaction 40min, stop heating and stirring. After the wastewater is treated, CN T <0.1mg / L, which is lower than the discharge value of the comprehensive sewage discharge standard.

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Abstract

The invention discloses a method for removing (sub)ferricyanide complexes. The method is to add common complexing agents and acid, and the solution is heated to a certain temperature to destroy the complexation balance between cyanide and iron, so that the iron ion and the added complexing agent are complexed, thereby releasing the process of cyanide ion, the released cyanide ion and acid Combined to generate hydrogen cyanide molecules, which overflow from the solution at high temperature and are absorbed by lye for reuse or further processing. The invention has good treatment effect, high treatment efficiency, stable system operation, and simple process flow; the cyanide ion released during the treatment process can be recovered and reused, and if it is not used, it can be treated with a common simple cyanide treatment method .

Description

Technical field [0001] The invention relates to a method for treating pollutants in the field of environmental protection, in particular to a method for treating waste water containing (ferrous) cyanide complexes and other metal cyanide complexes. Background technique [0002] In the production process of gold mines, a large amount of cyanide-containing wastewater is generated due to the use of cyanidation gold extraction technology. This part of the cyanide-containing wastewater contains not only relatively easy to treat releasable cyanide, thiocyanate and other heavy metals, but also a large amount of Metal cyanide complexes. Releasable cyanide and thiocyanate can be treated by traditional treatment methods, and the remaining large amounts of metal cyanide complexes, especially (ferrocyanide complexes) are difficult to remove by traditional simple methods. If this part of the metal cyanide complex is not treated, if the wastewater is reused, it will affect the production index...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/64
Inventor 叶锦娟
Owner CHANGCHUN GOLD RES INST
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