Method for preparing zinc cyanide coproduced with calcium sulfate by utilizing cyanide melt slag

A technology of calcium sulfate and zinc cyanide, applied in the directions of metal cyanide, calcium/strontium/barium sulfate, etc., can solve the problems of difficult control, complicated operation, unfavorable popularization and application, etc., and achieves less equipment investment and operation steps. Simple and suitable for promotion and application

Inactive Publication Date: 2011-01-26
汪晋强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] This method is cumbersome and complicated to operate, and it is difficult to control, so it is not conducive to popularization and application

Method used

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  • Method for preparing zinc cyanide coproduced with calcium sulfate by utilizing cyanide melt slag
  • Method for preparing zinc cyanide coproduced with calcium sulfate by utilizing cyanide melt slag
  • Method for preparing zinc cyanide coproduced with calcium sulfate by utilizing cyanide melt slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing zinc cyanide co-production calcium sulfate with cyanide melt waste slag, comprising the following specific steps:

[0035] A: Take 500kg of cyanide melt waste residue containing calcium cyanide, calcium sulfate and hydrogen cyanide, wherein the content of hydrogen cyanide is 150g, and the content of hydrogen cyanide is 50kg, and put it into the pipeline for reaction with excess zinc sulfate with a mass concentration of 10%. In the device (1), the chemical reaction is carried out at a temperature lower than 40°C;

[0036] B: when the reaction was carried out for 2 hours, the reaction product was suction-filtered in a suction filter pump (2), to obtain clarified cyanide filtrate and calcium sulfate filter cake;

[0037] C: the clarified cyanide filtrate is sent to the vacuum distiller (3), carries out vacuum distillation at 45 DEG C, and then cools to obtain a mixed solution containing zinc cyanide crystals;

[0038] D: Filter the mixed solution co...

Embodiment 2

[0041] A method for preparing zinc cyanide co-production calcium sulfate with cyanide melt waste slag, comprising the following specific steps:

[0042] A: Take 500kg of cyanide melt waste residue containing calcium cyanide, calcium sulfate and hydrogen cyanide, wherein the content of hydrogen cyanide is 200g, the content of hydrogen cyanide is 50kg, and the excess zinc sulfate with a mass concentration of 8% is put into the pipeline In the reactor (1), the chemical reaction is carried out at a temperature lower than 45°C;

[0043] B: when the reaction was carried out for 4 hours, the reaction product was suction-filtered in the suction filter pump (2), to obtain clarified cyanide filtrate and calcium sulfate filter cake;

[0044] C: the clarified cyanide filtrate is sent to the vacuum distiller (3), carries out vacuum distillation at 40 DEG C, and then cools to obtain a mixed solution containing zinc cyanide crystals;

[0045] D: Filter the mixed solution containing zinc cya...

Embodiment 3

[0048] A method for preparing zinc cyanide co-production calcium sulfate with cyanide melt waste slag, comprising the following specific steps:

[0049] A: Take 500kg of cyanide melt waste residue containing calcium cyanide, calcium sulfate and hydrogen cyanide, wherein the content of hydrogen cyanide is 250g, the content of hydrogen cyanide is 50kg, and the excess zinc sulfate with a mass concentration of 5% is put into the pipeline In the reactor (1), the chemical reaction is carried out at a temperature lower than 50°C;

[0050] B: when the reaction was carried out for 5 hours, the reaction product was suction-filtered in the suction filter pump (2), to obtain clarified cyanide filtrate and calcium sulfate filter cake;

[0051] C: the clarified cyanide filtrate is sent to the vacuum distiller (3), carries out vacuum distillation at 40 DEG C, and then cools to obtain a mixed solution containing zinc cyanide crystals;

[0052] D: Filter the mixed solution containing zinc cyani...

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Abstract

The invention provides a method for preparing zinc cyanide coproduced with calcium sulfate by utilizing cyanide melt slag, comprising the following specific steps: throwing the cyanide melt slag with excessive zinc sulfate with mass concentration of 5-10% into a pipe reactor to carry out chemical reaction for 2-5h under the temperature lower than 40-50 DEG C and carrying out suction filtration on the reaction products in a suction filtration pump to obtain clear cyanide filtrate and calcium sulfate filter cakes; feeding the clear cyanide filtrate into a vacuum distiller to undergo vacuum distillation at 40-50 DEG C and then cooling the distilled product to obtain mixed solution containing zinc cyanide crystals; filtering the mixed solution containing zinc cyanide crystals by a filter to obtain the zinc cyanide crystal products and dilute sulfuric acid solution; and washing the obtained calcium sulfate filter cakes in a washer, carrying out filter pressing on the calcium sulfate filter cakes by a filter press, drying the calcium sulfate filter cakes in a dryer, grinding the calcium sulfate filter cakes by a grinder and packaging the powder of the calcium sulfate filter cakes, thus obtaining the white calcium sulfate products. The method thoroughly utilizes the cyanide melt slag, ensures the content of cyanides in the cyanide melt slag to be lower than the discharge standard and creates economic value for the enterprises.

Description

technical field [0001] The invention relates to the field of zinc cyanide preparation, in particular to a method for preparing zinc cyanide and co-producing calcium sulfate with cyanide melt waste residue. Background technique [0002] Cyanide melt (cyanide fusant; cyanide melt), also known as black cyanide salt (black cyanide). It is a gray-black flake, powder or block product. It mainly contains substances such as calcium cyanide, sodium chloride and calcium oxide. Its manufacturing method is as follows: First, calcium cyanamide (lime nitrogen) is generated by reacting calcium carbide and nitrogen in an electric furnace. The reaction chemical equation is: [0003] CaC 2 +N 2 =CaCN 2 +C [0004] Then use calcium cyanamide, carbon, and salt to melt and react in an electric furnace to prepare cyanide melt. The reaction chemical equation is: [0005] CaCN 2 +C+NaCl=Ca(CN) 2 NaCl [0006] Cyanide melt is mainly used for the manufacture of various cyanides and heat tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/08C01F11/46
Inventor 王嘉兴
Owner 汪晋强
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