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Method for extracting ammonium thiocyanate from coking HPF desulfurization waste residues

A technology for ammonium thiocyanate and desulfurization waste residues, applied in thiocyanic acid, chemical instruments and methods, separation methods, etc., can solve the problems of low extraction efficiency of ammonium thiocyanate, decreased solution solubility, etc.

Active Publication Date: 2021-04-13
HUAIBEI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The coal gas desulfurization waste liquid currently in operation in the coking plant and the coke oven gas used in the coking plant are desulfurized and decyanated by the HPF method. When ammonium thiocyanate is extracted from the desulfurized waste residue, the existing method is prone to the problem of solution solubility drop during the operation process, resulting in Ammonium thiocyanate extraction efficiency is low

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  • Method for extracting ammonium thiocyanate from coking HPF desulfurization waste residues
  • Method for extracting ammonium thiocyanate from coking HPF desulfurization waste residues
  • Method for extracting ammonium thiocyanate from coking HPF desulfurization waste residues

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Embodiment 1

[0041] see Figure 1-Figure 7 , the present invention provides a technical solution:

[0042] The method for extracting ammonium thiocyanate from coking HPF desulfurization waste residue comprises the following steps:

[0043] S1. Grind coking waste slag into uniform granular powder with a diameter of 1 mm, then mix it with methanol to form a mixed solution and put it into the ammonium thiocyanate extraction equipment, and the waste slag mixed solution enters the extraction tank 2 from the feed tank 38 through the feeding cannula 37 ;

[0044] S2. Heat the waste residue mixture in the extraction tank 2, control the piston 3 to move down through the first hydraulic cylinder 4, control the reaction space in the extraction tank 2, and start the second hydraulic cylinder 5 to push the annular plug 6 to move down Control the lower space of the annular cavity 7, inject high-temperature steam into the lower space of the annular cavity 7 through the second air inlet pipe 9, and the ...

Embodiment 2

[0051] The method for extracting ammonium thiocyanate from coking HPF desulfurization waste residue comprises the following steps:

[0052] S1. Grinding the coking waste slag into uniform granular powder with a diameter of 7mm, then mixing it with methanol to form a mixed solution and putting it into the ammonium thiocyanate extraction equipment, and the waste slag mixed solution enters the extraction tank from the trough through the feeding tube;

[0053] S2. Heating the waste slag mixture in the extraction tank, controlling the downward movement of the piston through the first hydraulic cylinder, controlling the reaction space in the extraction tank, and starting the second hydraulic cylinder to push the annular plug down to control the lower space of the annular chamber, Inject high-temperature steam into the lower space of the annular cavity through the second air inlet pipe, and the steam heats the extraction tank, so that the waste residue mixture in the extraction tank i...

Embodiment 3

[0058] The method for extracting ammonium thiocyanate from coking HPF desulfurization waste residue comprises the following steps:

[0059] S1. Grinding the coking waste slag into uniform granular powder with a diameter of 2mm, then mixing it with methanol to form a mixed solution and putting it into the ammonium thiocyanate extraction equipment, and the waste slag mixed solution enters the extraction tank from the trough through the feeding tube;

[0060] S2. Heating the waste slag mixture in the extraction tank, controlling the downward movement of the piston through the first hydraulic cylinder, controlling the reaction space in the extraction tank, and starting the second hydraulic cylinder to push the annular plug down to control the lower space of the annular chamber, Inject high-temperature steam into the lower space of the annular cavity through the second air inlet pipe, and the steam heats the extraction tank, so that the waste residue mixture in the extraction tank i...

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Abstract

The invention discloses a method for extracting ammonium thiocyanate from coking HPF desulfurization waste residues. The method comprises the following steps: grinding coking waste residues into uniform granular powder, mixing with methanol to form a mixed solution, feeding the mixed solution into ammonium thiocyanate extraction equipment, and feeding the waste residue mixed solution into an extraction tank from a trough through a feeding insertion pipe; and heating the waste residue mixed solution in the extraction tank, adding a methanol solution for the second time, and feeding a mixed solution into the extraction tank again through a feeding insertion pipe. By means of the method, ammonium thiocyanate in the waste residues can be rapidly separated out, the solubility of the ammonium thiocyanate is kept by adding methyl alcohol after each time of filtration, the absorption amount of ammonium thiocyanate is increased, the ammonium thiocyanate can be conveniently extracted by means of ammonium thiocyanate extraction equipment, the space required by the reaction and the size of a heating and refrigerating area can be adjusted according to the input amount of waste residues, so that the energy-saving effect is achieved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of ammonium thiocyanate extraction, in particular to a method for extracting ammonium thiocyanate from coking HPF desulfurization waste residue. Background technique [0002] Ammonium thiocyanate is an inorganic substance with the chemical formula NH 4 SCN, colorless crystals. Irritant, deliquescent, soluble in water and ethanol, soluble in methanol and acetone, almost insoluble in chloroform and ethyl acetate. Its aqueous solution is blood red in case of iron salt solution, but has no reaction in case of ferrous salt. When the dried product is heated to 159°C, it does not decompose but melts, and when heated to 170°C, the molecule turns into thiourea. The relative density is 1.305. The melting point is about 149°C. Toxic, the minimum lethal dose (mice, oral) 330mg / kg. The coal gas desulfurization waste liquid currently in operation in the coking plant and the coke oven gas used in the coking plant are...

Claims

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Application Information

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IPC IPC(8): C01C3/20B01J19/18B01D29/03
CPCC01C3/20B01J19/18B01D29/03B01J19/0066B01J19/0053B01J19/0013Y02P20/10
Inventor 陈惜明薛建平潘梦瑶刘明茹刘梦婷曾雅珍
Owner HUAIBEI NORMAL UNIVERSITY