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Method for preparing potassium cyanide co-production mixed sulfate by using ammonia sodium residues

A technology of potassium cyanide and sulfate, applied in the directions of metal cyanide, simple alkali metal cyanide, etc., can solve the problem of not completely eradicating waste residue and the like, and achieve the effects of low cost, simple preparation process and simple equipment

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

Although the waste residue can meet the requirements of environmental protection, this method does not completely eradicate the CN in the waste residue. - , but only to control its content in the range of less than 0.5ppm
There is also no report about the method for preparing potassium cyanide co-production mixed sulfate with sodium ammonia method waste residue at present

Method used

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  • Method for preparing potassium cyanide co-production mixed sulfate by using ammonia sodium residues
  • Method for preparing potassium cyanide co-production mixed sulfate by using ammonia sodium residues

Examples

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Effect test

Embodiment 1

[0021] The method for preparing potassium cyanide co-production mixed sulfate from sodium ammonia method waste residue comprises the following preparation steps:

[0022] Step A, the waste residue obtained in the preparation of the product by the sodium ammonia method, zinc cyanide is calculated in 200kg, and sodium sulfate is dropped in the airtight reactor 1 according to the mass ratio of pure substance 1: 1.29, stir simultaneously, in the reactor The temperature is controlled at 60°C, and the stirring speed is 60 revolutions per minute;

[0023] Step B, filter the mixture after the complete reaction in step A with filter 2;

[0024] Step C, burning the filter cake obtained by filtering in step B;

[0025] Step D, the filtrate obtained by filtering in step B is sent to the vacuum distiller 3 for low-temperature distillation, and the distillation temperature is 40°C;

[0026] Step E, the liquid after distillation in step D is carried out crystallization through low-temperat...

Embodiment 2

[0028] The method for preparing potassium cyanide co-production mixed sulfate from sodium ammonia method waste residue comprises the following preparation steps:

[0029] Step A, the waste residue obtained in the preparation process of the product by the sodium ammonia method, zinc cyanide in 200kg, and sodium sulfate are put into the airtight reactor 1 according to the mass ratio of pure substance 1: 1.49, stir simultaneously, in the reactor The temperature is controlled at 65°C, and the stirring speed is 60 revolutions per minute;

[0030] Step B, filter the mixture after the complete reaction in step A with filter 2;

[0031] Step C, burning the filter cake obtained by filtering in step B;

[0032] Step D, the filtrate obtained by filtering in step B is sent to the vacuum distiller 3 for low-temperature distillation, and the distillation temperature is 50°C;

[0033] Step E, the liquid after distillation in the step D is carried out crystallization through low-temperature...

Embodiment 3

[0035] The method for preparing potassium cyanide co-production mixed sulfate from sodium ammonia method waste residue comprises the following preparation steps:

[0036] Step A, the waste residue obtained in the preparation process of the product by the sodium ammonia method, zinc cyanide is calculated in 200kg, and sodium sulfate is put into the airtight reactor 1 according to the mass ratio of pure substance 1: 1.69, stir simultaneously, in the reactor The temperature is controlled at 70°C, and the stirring speed is 60 revolutions per minute;

[0037] Step B, filter the mixture after the complete reaction in step A with filter 2;

[0038] Step C, burning the filter cake obtained by filtering in step B;

[0039] Step D, the filtrate obtained by filtering in step B is sent to the vacuum distiller 3 for low-temperature distillation, and the distillation temperature is 70 ° C;

[0040] Step E, the liquid after distillation in the step D is crystallized through low-temperature...

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Abstract

The invention relates to the technical field of comprehensively treating and utilizing ammonia sodium residues, in particular to a method for preparing potassium cyanide co-production mixed sulfate by using the ammonia sodium residues. The method comprises the main technical schemes of: firstly putting the ammonia sodium residues and sodium sulfate in a low-temperature closed reaction kettle according to the pure substance mass radio of 1:(1.29-1.69) to react, filtering after the reaction and sending filter cakes and impurities to be incinerated; firstly sending the filtrate to a reduced pressure distiller to carry out low-temperature distillation, then crystallizing the filtrate in a low-temperature crystallizer and at last obtaining potassium cyanide crystals and mixed sulfate. The invention not only has the advantages of simple and practicable preparation process and equipment and low cost, but also can completely eradicate CN- in the residues, eliminate the impact on the environment and simultaneously create products with certain economic value.

Description

technical field [0001] The invention relates to the technical field of comprehensive treatment and utilization of cyanide waste residue, in particular to a method for preparing potassium cyanide and co-producing mixed sulfate by using waste residue of the sodium ammonia method. technical background [0002] The sodium ammonia method is mainly using charcoal, metal sodium, and liquid ammonia as raw materials to directly synthesize sodium cyanide in a reaction pot. The cyanide content in the slag produced during the preparation process is 1 to 4%. It is toxic, and its production enterprises belong to the national key environmental protection and governance targets. Each of its procedures requires strict control and protection. Whether it is the gas treatment of the workshop or the outdoor air indicators, it is strictly tested and controlled. The discharge of the three wastes is even more stringent, so the intensity of governance is usually as detailed as the diffusion of cyani...

Claims

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Application Information

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IPC IPC(8): C01C3/10
Inventor 王嘉兴
Owner 汪晋强
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