Method and system for preparing sodium pyrosulfite by using sodium sulfate crystal salt byproduct of coal chemical industry wastewater

A technology of coal chemical wastewater and sodium pyrosulfite, applied in the field of coal chemical industry, can solve the problem of difficult resource utilization of sodium sulfate crystalline salt, achieve the effect of improving resource utilization efficiency and economic benefits, and saving input costs

Pending Publication Date: 2021-12-24
CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem in the prior art that the sodium sulfate crystalline salt produced by-product of coal chemical industry is difficult to be fully utilized as a resource, and to provide a method and system for preparing sodium pyrosulfite by using sodium sulfate crystalline salt produced by-produced by coal chemical industry concentrated brine

Method used

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  • Method and system for preparing sodium pyrosulfite by using sodium sulfate crystal salt byproduct of coal chemical industry wastewater
  • Method and system for preparing sodium pyrosulfite by using sodium sulfate crystal salt byproduct of coal chemical industry wastewater

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Embodiment approach

[0054] According to a particularly preferred embodiment of the present invention, the method for preparing sodium pyrosulfite by using the sodium sulfate crystalline salt produced by the coal chemical industry wastewater, the method includes:

[0055] (1) Put industrial sulfur into the tank, raise the temperature of molten sulfur tank 1 to 135°C-140°C and keep it warm to obtain liquid sulfur, use a sulfur pump to filter the liquid sulfur through a filter device and mix it with air, and mix the obtained mixed product Spray it into the incinerator 3 in the form of mist and incinerate to produce furnace gas containing sulfur dioxide (SO 2 volume content ≥ 15%);

[0056] (2) Fully react quicklime and desalted water in the ash tank 5 to obtain a lime suspension;

[0057] (3) Pass the furnace gas containing sulfur dioxide into the acidification tank 4, mix with the lime suspension in the acidification tank 4 to carry out the second reaction to obtain calcium bisulfite solution, the...

Embodiment 1

[0066] (1) Put industrial sulfur into molten sulfur tank 1, raise the temperature of molten sulfur tank 1 to 135°C and keep it warm to obtain liquid sulfur, use a sulfur pump to filter the liquid sulfur through a filter device and mix it with air, and mix the obtained mixture The product is sprayed into the incinerator 3 in the form of mist for incineration to produce furnace gas containing sulfur dioxide (SO 2 volume content of 90%);

[0067] (2) Fully react quicklime and desalted water in the ash tank 5 to obtain a lime suspension;

[0068] (3) Furnace gas containing sulfur dioxide is fed into the acidification tank 4, mixed with the lime suspension in the acidification tank 4 to carry out the second reaction to obtain calcium bisulfite solution, the temperature of the second reaction is 85 ° C, pH is 4.2;

[0069] (4) Pump the acidified solution (calcium bisulfite solution) that has been acidified into the first reactor 6, and add the sodium sulfate crystalline salt produ...

Embodiment 2

[0076] (1) Put industrial sulfur into molten sulfur tank 1, raise the temperature of molten sulfur tank 1 to 135°C and keep it warm to obtain liquid sulfur, use a sulfur pump to filter the liquid sulfur through a filter device and mix it with air, and mix the obtained mixture The product is sprayed into the incinerator 3 in the form of mist for incineration to produce furnace gas containing sulfur dioxide (SO 2 volume content of 91%);

[0077] (2) Fully react quicklime and desalted water in the ash tank 5 to obtain a lime suspension;

[0078] (3) Furnace gas containing sulfur dioxide is fed into the acidification tank 4, mixed with the lime suspension in the acidification tank 4 to carry out the second reaction to obtain calcium bisulfite solution, the temperature of the second reaction is 85 ° C, pH is 4.2;

[0079] (4) Pump the acidification solution (calcium bisulfite solution) completed by acidification into the first reactor 6, and add the sodium sulfate crystalline sal...

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Abstract

The invention relates to the technical field of coal chemical industry, and concretely relates to a method and a system for preparing sodium pyrosulfite by using sodium sulfate crystal salt. The method comprises the following steps: (1) contacting the sodium sulfate crystal salt with a calcium hydrogen sulfite solution to carry out first reaction to obtain a first mixed system, and carrying out centrifugal separation on the first mixed system to obtain a gypsum precipitate and a sodium hydrogen sulfite solution; and (2) introducing furnace gas containing sulfur dioxide into the sodium hydrogen sulfite solution to form a sodium hydrogen sulfite supersaturated solution, and separating out sodium pyrosulfite crystals in the sodium hydrogen sulfite supersaturated solution to obtain a second mixed system. Sodium pyrosulfate is produced by replacing sodium carbonate with the byproduct sodium sulfate crystalline salt of the coal chemical industry wastewater, so that the adding cost of sodium carbonate can be effectively saved, and sodium pyrosulfate meeting the national standard is produced for downstream markets to use; and the byproduct gypsum can be used as a building material and a cement raw material, so that the resource utilization efficiency and the economic benefit of the byproduct crystal salt are improved.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a method and a system for preparing sodium pyrosulfite by using sodium sulfate crystalline salt produced by coal chemical industry wastewater. Background technique [0002] At present, the salt mud produced by wastewater treatment that cannot be used as a resource is temporarily managed as hazardous waste. The crystalline miscellaneous salt that cannot be used as a resource must be sent to a qualified hazardous waste disposal center for disposal or landfill. However, the number of qualified processing centers is small and the processing capacity is limited; and the processing cost is high, and the processing cost per ton of miscellaneous salt is about 3,000 yuan. In the process of zero-discharge wastewater treatment, refining and purifying miscellaneous salts to obtain high-purity crystalline salts is one of the effective ways to reduce, recycle, and harmless misc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14B01D53/50B01D9/02
CPCC01D5/145B01D53/502B01D9/00B01D2251/304
Inventor 李成李晓华叶飞张怀滨王海军武海杰闫宏宇朱德汉贺飞
Owner CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD
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