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Method for separating and recovering valuable metals in cyanide-containing wastewater

A valuable metal, separation and recovery technology, applied in the direction of metal cyanide, ferricyanide, copper oxide/copper hydroxide, etc., can solve the problems of low filtration efficiency, high moisture content of filter cake, difficult solid-liquid separation, etc.

Pending Publication Date: 2020-12-29
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

This method has a better treatment effect on ferricyanide complexes, but the ferrocyanide precipitation produced is difficult to achieve solid-liquid separation
Such as ferric ferrocyanide (ferric ferrocyanide), also known as Prussian Blue (Prussian Blue), the chemical formula is Fe 4 [Fe(CN) 6 ] 3 , molecular weight 859.22800 (accurate mass: 859.60000), boiling point 25.7°C (at 760mmHg), insoluble in water, density 1.8g / cm 3 , the appearance of dark blue powder or block, can be light-resistant and acid-resistant, but it will decompose when boiled with concentrated sulfuric acid; weak alkali resistance, even dilute alkali can make it decompose, can not be used with alkaline pigments, ferric ferrocyanide Precipitation is difficult to filter and precipitate, and there are problems such as serious diafiltration of laboratory filter paper, inability to form an effective layer, low filtration efficiency, and high water content of filter cake in industrial production filter presses, which restrict the industrial practice of precipitation treatment of cyanide-containing barren liquid

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  • Method for separating and recovering valuable metals in cyanide-containing wastewater
  • Method for separating and recovering valuable metals in cyanide-containing wastewater

Examples

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Effect test

Embodiment 1

[0041] Cyanide-containing barren solution of a gold mine, pH value is 10.3-10.8, CN T 1689.22mg / L, CN f It is 379.89mg / L, Cu is 223mg / L, Fe is 675mg / L, and it also contains other heavy metal ions. Take the waste water and put it in the stirring tank, add concentrated sulfuric acid to adjust the pH of the poor solution to about 9, add 6mL / L hydrogen peroxide (30%) and stir for 1 hour, then pump the solution into the deep cone thickener, The enrichment and concentration of copper-containing precipitates is completed under the action of sedimentation, and the concentrated underflow is separated by a horizontal screw discharge sedimentation centrifuge. The separation factor reaches 2500G to realize the forced enrichment and solidification separation of the flocculent solid.

[0042] Take filtrate analysis: CN T 1110.6mg / L, CN f is 36.3mg / L, Cu is 18.7mg / L, and Fe is 585.6mg / L. Get 6 parts of 1L filtrate, add 4g / L ferrous sulfate (FeSO 4 ·7H 2 0) after stirring and reacting f...

Embodiment 2

[0052] Cyanide-containing wastewater from a gold mine, with a pH value of 12.89, CN T 7156mg / L, CN f It is 3710mg / L, Cu is 2046mg / L, Fe is 2083mg / L, and there are other heavy metal ions. Take 2L of waste water and place it in a stirring tank, add concentrated sulfuric acid to adjust the pH of the poor solution to about 9, add 18mL / L hydrogen peroxide (30%) and stir for 1 hour, then pump the solution into a deep cone thickener, The enrichment and concentration of copper-containing precipitates is completed under the action of flocculation and sedimentation. The concentrated underflow is separated by a strong field high-speed centrifuge—horizontal screw discharge sedimentation centrifuge. The separation factor reaches 2500G to realize the forced enrichment and solidification of the flocculent solid Separation, filtrate analysis: CN T 3253.9mg / L, CN f 185.4mg / L, Cu 122.6mg / L, and Fe 1241.5mg / L. Take 1.5L filtrate, add 9g / L ferrous sulfate (FeSO 4 ·7H 2 O) After stirring for...

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Abstract

The invention belongs to the technical field of valuable metal recovery, and particularly relates to a method for separating and recovering valuable metals in cyanide-containing wastewater. The methodcomprises the following steps: adding an oxidant into cyanide-containing wastewater containing a large amount of copper and ferricyanide complex ions to carry out cyanide breaking and copper precipitation reaction to generate copper-containing precipitates, separating the copper-containing precipitates by adopting a special high-speed centrifugal separation technology, and adding a co-precipitator into a supernatant after separation to convert the ferricyanide complex ions with strong complexing property into iron-containing suspended precipitates; then combining the coprecipitation technology and the special high-speed centrifugal separation technology to achieve solid-liquid separation of ferrocyanide, and clear liquid obtained after solid-liquid separation returns to the production process or is discharged after reaching the standard after deep treatment. The invention realizes the separation of the chemical suspended matter iron ferrocyanide in the cyanide-containing wastewater containing a large amount of copper and iron cyanide complex ions, has the advantages of simple process flow, good treatment effect, high treatment efficiency and stable operation, and is especially suitable for the treatment process of the cyanide-containing wastewater.

Description

technical field [0001] The invention belongs to the technical field of recovery of valuable metals, and in particular relates to a method for separating and recovering valuable metals in cyanide-containing wastewater. Background technique [0002] In gold production, since the wet extraction of gold requires the use of cyanide, a large amount of cyanide-containing barren solution is produced during the production process. Due to repeated use, the barren liquid is enriched with free cyanide and a large amount of copper and ferricyanide complex ions. During the production process of gold extraction, the concentration of heavy metals in the circulating liquid will continue to accumulate and increase. And other process indicators have adverse effects. Therefore, how to efficiently treat barren liquid containing cyanide and recover valuable metals has always been a difficult problem in the industry. [0003] Precipitation method is to use heavy metal ions such as ferrous salt o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/12C01G3/02
CPCC01C3/12C01G3/02
Inventor 丁成王莹迟崇哲
Owner CHANGCHUN GOLD RES INST
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