Apparatus and method for preparing sodium hyposulfite through purifying coking desulphurization waste liquid salt extraction filter residues used as raw material

A technology of coking desulfurization waste liquid and sodium thiosulfate, which is applied in the direction of thiosulfate/dithionite/polythionite, etc., which can solve the problems of difficult control of the reaction process, difficulty in meeting industrial production, pollution and waste, etc.

Inactive Publication Date: 2016-08-03
BEIJING FUHAITIAN ENVIRONMENTAL SCI & TECH CO LTD
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Problems solved by technology

The existing sodium thiosulfate preparation method has complex process, long reaction time, difficult control o

Method used

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  • Apparatus and method for preparing sodium hyposulfite through purifying coking desulphurization waste liquid salt extraction filter residues used as raw material
  • Apparatus and method for preparing sodium hyposulfite through purifying coking desulphurization waste liquid salt extraction filter residues used as raw material
  • Apparatus and method for preparing sodium hyposulfite through purifying coking desulphurization waste liquid salt extraction filter residues used as raw material

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Embodiment

[0031] In this embodiment, the device for purifying sodium thiosulfate with coking desulfurization waste liquid extracting salt and extracting filter residue as raw material, such as figure 1 As shown, it includes a dissolution kettle 1, a plate and frame filter 2, a precision filter 3, an Oslo evaporation crystallizer group and a centrifuge 10 connected in sequence by pipelines. Such as figure 2 As shown, the upper part of the dissolution kettle 1 includes a liquid phase feed port 11, a solid phase feed port 12 and a self-circulation feed port 14. It has a steam inlet 15, a steam condensate outlet 16 at the lower part, and a solution outlet 13 at the bottom. Such as image 3 As shown, the upper part of the side wall of the precision filter 3 has a precision filter inlet 17, the top has a precision filter outlet 18, the bottom has a sewage outlet 19, and the inside has a filter element 20. Such as Figure 4 As shown, the Oslo evaporative crystallizer group includes a sepa...

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Abstract

A device and method for purifying sodium thiosulfate by using coking desulfurization waste liquid salt extraction and filter residue as raw material, the device includes a dissolution kettle, a plate and frame filter, a precision filter, an evaporation crystallizer and a centrifugal machine. The present invention uses coking desulfurization waste liquid salt extraction filter residue as raw material, dissolves, plate and frame filter, precision filter, crystallizes in Oslo cooling crystallizer, and centrifugally separates the product sodium thiosulfate. Compared with other methods for preparing sodium thiosulfate, the present invention not only has easy-to-obtain raw materials, simple process, energy-saving, larger crystal particles of the product sodium thiosulfate, but also realizes resource utilization of extraction filter residue, low cost and environmental protection.

Description

technical field [0001] The invention relates to the field of sodium thiosulfate purification, in particular to a device and method for purifying sodium thiosulfate by using coking desulfurization waste liquid extraction filter residue as raw material. technical background [0002] The traditional sodium thiosulfate production process is divided into thiolation, oxidation, evaporation, crystallization and other processes. It is to concentrate the dilute sodium sulfide solution to obtain a concentrated solution, which reacts with sulfur at a certain temperature to form a sodium polysulfide solution, and then blows air Oxidation produces dilute sodium bicarbonate solution, and then a series of processes such as evaporation, concentration, and crystallization are used to obtain finished products. The existing sodium thiosulfate preparation method has complicated process, long reaction time, difficult control of the reaction process, serious pollution and waste, and is difficult ...

Claims

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Application Information

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IPC IPC(8): C01B17/64
CPCC01B17/64
Inventor 陈淦勇付天臣张扬张鹏飞
Owner BEIJING FUHAITIAN ENVIRONMENTAL SCI & TECH CO LTD
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