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A kind of production method of yellow blood salt sodium

A yellow blood salt sodium and production method technology, applied in the field of coking product recovery, can solve the problems of difficult absorption, crystallization blockage, difficult process control, etc., and achieve the effects of reducing process equipment, easy operation, and eliminating evaporation and concentration

Active Publication Date: 2018-02-13
山西鸿生化工股份有限公司
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  • Claims
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Problems solved by technology

[0004] The present invention overcomes the deficiencies in the prior art, and the technical problem to be solved is that in the process of producing yellow blood salt sodium by the iron powder method, in the process of removing the secondary absorption of the primary reaction liquid, because a large amount of yellow blood salt sodium is contained in the liquid, making The transportation, storage, and absorption of this liquid are very difficult, and if you are not careful, it will crystallize and block, and the process control is very difficult.

Method used

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Effect test

Embodiment 1

[0016] A kind of production method of yellow blood salt sodium, the mother liquor in the process of producing yellow blood salt sodium carries out full circulation, and concrete technological process is as follows:

[0017] a. Send the centrifuged mother liquor in the production process to the sodium cyanide section for secondary absorption;

[0018] b. The content of the two alkalis after absorption is 5g / L;

[0019] c. Mix the secondary absorption mother liquor with 30% sodium cyanide in a volume ratio of 3:1;

[0020] d. React the mixed feed solution with iron powder at a reaction temperature of 90°C, and the reaction ends when the cyanide content is 1g / L, and the sodium hydroxide content of the reaction solution is 50g / L at the end of the reaction;

[0021] e. The reacted feed liquid is added with 1% lime of the mass of the mixed feed liquid and filtered directly, and the filtrate is crystallized, and the crystallization temperature is 35°C;

[0022] f. Centrifugal separ...

Embodiment 2

[0024] A kind of production method of yellow blood salt sodium, the mother liquor in the process of producing yellow blood salt sodium carries out full circulation, and concrete technological process is as follows:

[0025] a. Send the centrifuged mother liquor in the production process to the sodium cyanide section for secondary absorption;

[0026] b. The content of the two alkalis after absorption is 3g / L;

[0027] c. Mix the secondary absorption mother liquor with 32% sodium cyanide in a volume ratio of 3:1;

[0028] d. React the mixed feed solution with iron powder at a reaction temperature of 95°C until the reaction ends when the cyanide content is 0.6 g / L, and the sodium hydroxide content of the reaction solution is 45 g / L at the end of the reaction;

[0029] e. The reacted feed liquid is added with 2% lime of the mass of the mixed feed liquid and filtered directly, and the filtrate is crystallized, and the crystallization temperature is 35°C;

[0030] f. Centrifugal ...

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Abstract

The invention relates to a production method of sodium ferrocyanide, in particular to a production method of coking industry sodium ferrocyanide and belongs to the technical field of coking product recovery. The technical problems that in the technological process of producing sodium ferrocyanide through an iron powder method, in the process of secondarily absorbing primary reaction liquid, as a large amount of sodium ferrocyanide is contained in the liquid, conveyance, storage and absorption of the liquid are difficult, crystal blocking is caused by any carelessness, and the process control difficulty is high are solved. According to the technical scheme, the easily-crystallized primary reaction liquid is replaced with centrifugal mother liquid.

Description

technical field [0001] The invention relates to a production method of yellow blood salt sodium, in particular to a production method of coking industrial yellow blood salt sodium, and belongs to the technical field of recovery of coking chemical products. Background technique [0002] At present, there are basically two kinds of domestic yellow blood sodium production: ferrous sulfate method and iron powder method. The ferrous sulfate method refers to using about 20% sodium cyanide to directly add ferrous sulfate to react at 85-90°C, and then filter. Evaporation concentration, crystallization, centrifugation process. The method has simple process and easy-to-obtain raw materials, and was widely used before 2000. But this method has two fatal shortcomings: one is difficult to filter, and the other is too much sodium sulfate waste residue containing yellow blood salt, which is difficult to handle. So after 2000, it was gradually replaced by the iron powder method. The iron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/12
CPCC01C3/12
Inventor 李立华张文保
Owner 山西鸿生化工股份有限公司
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