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Hydrothermal preparation method of editpotassium cyanide solution

A technology of potassium cyanide and potassium ferricyanide, which is applied in the direction of metal cyanide and simple alkali metal cyanide, can solve the problems of complex equipment process and high cost, and achieve simple equipment and process, low production cost and low temperature Effect

Inactive Publication Date: 2015-07-15
贾冲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also have to adopt sodium ammonia method (Chinese patent application number: CN201010190367), cyanide melt method (Chinese patent application number: CN201010190451) and light oil cracking (Chinese patent application number: CN201010190313) to prepare in the enterprise, these method costs are all higher, The equipment process is complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Preparation of 0.006M KCN ​​solution by hydrothermal treatment at 140°C

[0011] K at a concentration of 0.001M 3 Fe(CN) 6 The aqueous solution is placed in the polytetrafluoroethylene lining of the hydrothermal kettle. After the hydrothermal kettle is sealed, it is kept at 140°C for 72 hours. After the hydrothermal reaction, add three times the amount of K to the solution. 3 Fe(CN) 6 Amount of KOH solids, stirred to dissolve and filtered to remove Fe 2 o 3 Precipitation, the final solution obtained is a KCN solution with a concentration of 0.006M.

Embodiment 2

[0012] Embodiment 2: 180 ℃ hydrothermal preparation 0.06M KCN ​​solution

[0013] K at a concentration of 0.01M 3 Fe(CN) 6 The aqueous solution is placed in the polytetrafluoroethylene lining of the hydrothermal kettle. After the hydrothermal kettle is sealed, it is kept at 180°C for 48 hours. After the hydrothermal reaction, add three times the amount of K to the solution. 3 Fe(CN) 6 Amount of KOH solids, stirred to dissolve and filtered to remove Fe 2 o 3 Precipitation, the final solution obtained is a KCN solution with a concentration of 0.06M.

Embodiment 3

[0014] Embodiment 3: 250 ℃ hydrothermal preparation 6M KCN ​​solution

[0015] K at a concentration of 1M 3 Fe(CN) 6 The aqueous solution is placed in the polytetrafluoroethylene lining of the hydrothermal kettle. After the hydrothermal kettle is sealed, it is kept at 250°C for 24 hours. After the hydrothermal reaction, add three times the amount of K to the solution. 3 Fe(CN) 6 Amount of KOH solids, stirred to dissolve and filtered to remove Fe 2 o 3 Precipitation, the final solution obtained is the KCN solution with a concentration of 6M.

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PUM

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Abstract

The invention provides a hydrothermal preparation method of an editpotassium cyanide solution. According to the hydrothermal preparation method, potassium ferricyanide is used as a raw material. The hydrothermal preparation method comprises the steps of dissolution, hydrothermal reaction and separation of all units. The hydrothermal preparation method is characterized in that a K3Fe(CN)6 aqueous solution is put in a polytetrafluoroethylene lining of a hydrothermal kettle, after the hydrothermal kettle is sealed, the hydrothermal kettle is subjected to heat preservation for 24-72 hours at the temperature of 140-250 DEG C, after hydrothermal reaction, KOH solids, the amount of substance of which is three times as much as that of the K3Fe(CN)6, are added to the solution, after the KOH solids are dissolved by stirring, Fe2O3 precipitates are filtered out, and finally the KCN solution with corresponding concentration is obtained. By adopting the hydrothermal preparation method, equipment and technological processes can be simplified, and the cost is greatly reduced.

Description

1. Technical field [0001] The invention relates to a preparation method of inorganic substances, in particular to a hydrothermal preparation method of potassium cyanide solution. 2. Background technology [0002] Potassium cyanide is soluble in water and highly toxic. Industrially used in ore flotation to extract gold and silver, electroplating, heat treatment of steel, and organic nitrile manufacture. In addition, it is also used in photography, etching, lithography, etc. It is usually prepared by co-heating potassium carbonate and carbon in ammonia gas flow or co-melting calcium cyanamide (base) and potassium hydroxide. The required temperature is high and the reaction conditions are harsh. Also have to adopt sodium ammonia method (Chinese patent application number: CN201010190367), cyanide melt method (Chinese patent application number: CN201010190451) and light oil cracking (Chinese patent application number: CN201010190313) to prepare in the enterprise, these method c...

Claims

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Application Information

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IPC IPC(8): C01C3/10
Inventor 贾冲刘广强叶长辉蔡伟平
Owner 贾冲
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