Method for preparing cuprous cyanide by using high-concentration cyanogen-containing wastewater

A technology for cuprous cyanide and cyanide wastewater, applied in the direction of metal cyanide, which can solve the problems of high treatment costs, pollution, and ineffective recycling of cyanide

Inactive Publication Date: 2018-03-06
杭州青化社化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, for high-concentration cyanide-containing wastewater, the chlor-alkali method or ferrous sulfate method is generally used for cyanide removal wastewater treatment, but these methods not only fail to effectively recycle the cyanide in the wastewater, but also introduce a large number of cyanide removal chemicals and introduce new pollution. , expensive to process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing cuprous cyanide by utilizing high-concentration cyanide-containing wastewater,

[0019] The high-concentration cyanide-containing wastewater sample mainly contains CN-, [Cu(CN)3]2-, [Fe(CN)6]2-,

[0020] The preparation steps are as follows:

[0021] (1) Prepare Cu+ by reducing copper sulfate solution with sulfite, and the reaction formula is as follows:

[0022] 2Cu2+ + SO32- + 2OH- = 2Cu+ + 4SO2- + H2O

[0023] (2) Take a certain amount of cyanide-containing wastewater (determine its cyanide content and copper content, and calculate the required amount of copper sulfate) and add it to the Cu+ solution obtained by reducing the copper sulfate solution, and stir to carry out the CuCN synthesis reaction. The reaction time is After 1.5h, a small amount of Cu2 (Fe(CN)6) precipitated at the same time.

[0024] (3) Waste liquid is continuously added to the solution, and the pH value continues to rise. After the reaction, the pH value is alkaline, so ...

Embodiment 2

[0028] The high-concentration cyanide-containing wastewater sample mainly contains CN-, [Cu(CN)3]2-, [Fe(CN)6]2-,

[0029] The preparation steps are as follows:

[0030] (1) Prepare Cu+ by reducing copper sulfate solution with sulfite, and the reaction formula is as follows:

[0031] 2Cu2+ + SO32- + 2OH- = 2Cu+ + 4SO2- + H2O

[0032] (2) Take a certain amount of cyanide-containing wastewater (determine its cyanide content and copper content, and calculate the required amount of copper sulfate) and add it to the Cu+ solution obtained by reducing the copper sulfate solution, and stir to carry out the CuCN synthesis reaction. The reaction time is After 0.5h, a small amount of Cu2 (Fe(CN)6) precipitated at the same time.

[0033] (3) Waste liquid is continuously added to the solution, and the pH value continues to rise. After the reaction, the pH value is alkaline, so the pH value of the solution will continue to rise with the addition of waste liquid. After the reaction, the pH...

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PUM

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Abstract

The invention discloses a method for preparing cuprous cyanide by using high-concentration cyanogen-containing wastewater. The method comprises the following preparation steps: preparing Cu<+>; performing CuCN synthesis reaction; adjusting PH; soaking with concentrated sulfuric acid, washing with water, filtering and dehydrating. The Cu<+> is prepared by a reduction method and is added into high-concentration cyanogen-containing wastewater to form cuprous cyanide precipitate, adjusting the PH value of inorganic acid to continuously reduce the cyanogens content of filtrate, and through a seriesof chemical processes, the purity of the cuprous cyanide is continuously improved and the highest purity is 98.92 percent.

Description

technical field [0001] The invention belongs to the field of cuprous cyanide preparation, in particular to a method for preparing cuprous cyanide by using high-concentration cyanide-containing wastewater. Background technique [0002] At present, for high-concentration cyanide-containing wastewater, the chlor-alkali method or ferrous sulfate method is generally used for cyanide removal wastewater treatment, but these methods not only fail to effectively recycle the cyanide in the wastewater, but also introduce a large number of cyanide removal chemicals and introduce new pollution. , which is expensive to process. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing cuprous cyanide by using high-concentration cyanide-containing wastewater with simple process and high recovery efficiency. [0004] In order to solve the above-mentioned technical problems, the invention provides a kind of method u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/08
CPCC01C3/08
Inventor 张信勇
Owner 杭州青化社化工有限公司
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