Method for realizing short-process and green cyclic utilization of cyanogen-containing barren solution

A short process, lean liquid technology, applied in the direction of thiocyanic acid, process efficiency improvement, etc., can solve the problems of low current efficiency, low precipitation purity, high processing cost, achieve recycling, significant economic benefits, and improve dissolution rate. Effect

Inactive Publication Date: 2019-05-10
NORTHEASTERN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the treatment of high-concentration cyanide-containing barren liquid, the purification method has the disadvantages of using a large amount of chemicals, producing a large amount of sedimentation slag, which cannot be recycled, and high processing costs; while the acidification recovery method has relatively strict process conditions and produces a large amount of precipitation during production. The slag cannot be recycled, and the barren solution after acidification needs to be combined with other treatment methods to meet the standard treatment
Invention patent CN201710292022.3 proposes to use cyanide-containing wastewater to treat and neutralize waste residues to recover valuable metal elements. Although this process can recover a small amount of gold and silver in waste residues; however, copper and zinc elements cannot be fully u

Method used

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  • Method for realizing short-process and green cyclic utilization of cyanogen-containing barren solution
  • Method for realizing short-process and green cyclic utilization of cyanogen-containing barren solution
  • Method for realizing short-process and green cyclic utilization of cyanogen-containing barren solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Take 2L of cyanogen-containing poor solution, that is, 2L of high-concentration thiocyanate-containing coking wastewater, and add NaHSO 3 18g, CuSO 4 ·5H 2 O40g was made into a solution, added dropwise evenly, keeping pH=9, stirring and reacting for 2h after the dosing was completed; adding NaHSO 3 4g, CuSO 4 ·5H 2 O6.4g was made into a solution, added dropwise evenly, kept pH=9, and stirred for 2h with air blowing; filtered to obtain the filtrate (SCN - : 77ppm, CN - : 40ppm) and reduced sediment residue, the filtrate is returned to leaching or oxidation treatment (1L / m 3 Hydrogen peroxide) total cyanide concentration is 0.15ppm, thiocyanate 8.9ppm, copper concentration 0.19g / L, and the reduction precipitation slag is processed in the next step;

[0045] (2) Use sodium hydroxide solution to adjust the pH to 14, mix it with the reduced precipitation slag according to the liquid-solid ratio of 3:1, then add 2g / L sodium sulfide, control the stirring speed at 6...

Embodiment 2

[0049] (1) Get 2L of cyanogen-containing poor liquid, which can be high-concentration thiocyanate-containing coking wastewater, or other high-concentration cyanogen-containing waste liquid, and add Na 2 SO 3 14g, CuSO 4 ·5H 2 O 35g was made into a solution, and the pH=9 was maintained. After the dosing was completed, the reaction was stirred for 1 hour; Na was added 2 SO 3 6g, CuSO 4 ·5H 2 O 10g was made into a solution, kept at pH=9, and stirred for 1 hour with blowing air; filtered to obtain the filtrate and reduced precipitate, the filtrate was returned to leaching, and the reduced precipitate was processed in the next step;

[0050] (2) Use sodium hydroxide solution to adjust the pH to 14, mix it with the reduced precipitation residue according to the liquid-solid ratio of 10:1, then add 5g / L sodium sulfide, control the stirring speed at 600r / min for leaching for 4 hours, and filter to obtain the leachate and alkali leaching residue , thiocyanate conversion rate of...

Embodiment 3

[0054] (1) Take 2L of cyanogen-containing poor solution, add Na 2 SO 3 24g, CuSO 4 ·5H 2 O 60g was made into a solution, kept at pH=9, stirred and reacted for 4h after the dosing was completed; added Na 2 SO 3 12g, CuSO 4 ·5H 2 O 15g was made into a solution, kept at pH=9, stirred with air for 4 hours; filtered to obtain the filtrate and reduced precipitate, the filtrate was returned for leaching, and the reduced precipitate was processed in the next step;

[0055] (2) Use sodium hydroxide solution to adjust the pH to 12, mix it with the reduced precipitation slag at a liquid-solid ratio of 10:1, then add 4g / L sodium sulfide, control the stirring speed at 600r / min for leaching for 2 hours, and filter to obtain the leaching solution and alkali leaching residue , thiocyanate conversion rate of 90%;

[0056] (3) Alkali leaching solution and gold-bearing ore are at a liquid-solid ratio of 3:1, adjust pH = 11, rotate at 600r / min, and leaching for 24 hours under the conditi...

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Abstract

The invention provides a method for realizing short-process and green cyclic utilization of a cyanogen-containing barren solution. Firstly, reduction precipitation is carried out on the cyanogen-containing barren solution so as to enable SCN <-> and Cu<+> to precipitate to be enriched in residues; the purified barren solution is returned to be subjected to cyaniding leaching or follow-up oxidationtreatment to meet the standard to be discharged; then precipitated residues are transferred to be dissolved in alkali liquor through the alkali liquor so that the SCN<-> can be transferred into the alkali liquor to be used for leaching gold extracting from gold ore or cyaniding tailings, preparing thiocyanate and the like, and the dissolving-transferred residues are returned to the reduction precipitation step so as to reduce the consumption of precipitant, namely, copper salt. The method for realizing short-process and green cyclic utilization of the cyanogen-containing barren solution is high in economic benefit, small in pollution, and capable of protecting the environment.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a short-process green recycling method for cyanogen-containing barren liquid. Background technique [0002] Due to the mature process of gold extraction by cyanidation, low cost and simple operation, more than 80% of gold extraction in the world mainly uses cyanidation, so a large amount of barren solution containing cyanide is produced in the production process. Because the cyanogen-containing poor solution is recycled for a long time, it is difficult to discharge up to the standard, resulting in complex components, high concentrations of total cyanide and thiocyanate, and the sum of the two can reach 1%, or even higher. At the same time, the barren solution containing cyanide also contains valuable metals that can be comprehensively recovered, such as copper and zinc. Moreover, the copper-cyanide complex accumulated in the cyanide-containing barren solution wi...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/00C22B11/08C01C3/20
CPCY02P10/20
Inventor 李斌川张建元韩庆林明国吕久吉王利刘奎仁丛中奎陈建设王洪凯李名新隋羽张俊浩马红利
Owner NORTHEASTERN UNIV
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