Method for preparing sodium pyrosulfite from coking desulfurization waste liquid and crude sulfur

A technology for coking desulfurization waste liquid and sodium metabisulfite, which is applied in the chemical industry, can solve problems such as affecting environmental protection goals, affecting the normal operation of desulfurization devices, etc., and achieves the effects of reducing equipment investment, good economic benefits, and simplified process flow

Inactive Publication Date: 2019-04-12
朱华东
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Problems solved by technology

[0004] In summary, if the desulfurization waste liquid cannot be effectively harmlessly treated and the waste sulfur can be comprehensively utilized to solve its sales problem, it will directly affect the normal operation of the desulfurization device, and then affect the realization of the company's overall environmental protection goals

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  • Method for preparing sodium pyrosulfite from coking desulfurization waste liquid and crude sulfur

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Embodiment Construction

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] see figure 1 , in an embodiment of the present invention, a method for producing sodium metabisulfite by using coking desulfurization waste liquid and crude sulfur, including raw material pretreatment process, sulfur burning process, furnace gas purification process and finished product process, the above four processes include the following steps:

[0035] Raw material pretreatment process

[0036] A1) Put the sulfur foam into the sulfur melting kettl...

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Abstract

The invention discloses a method for preparing sodium pyrosulfite from coking desulfurization waste liquid and crude sulfur, which comprises a raw material pretreatment step, a sulfur burning step, afurnace gas purification step and a finished product step. The invention adopts the technology of a sulfur melting kettle to prepare sulfur, and the desulfurization waste liquid is subjected to concentrated crystallization to directly prepare mixed salt, and then the mixed salt is respectively sent to an incinerator for direct combustion, thereby not only innocuously treating the desulfurization waste liquid, but also comprehensively utilizing the sulfur resources; the low pressure saturated steam from coking plant is used to produce massive sulfur by using the technology of the sulfur meltingkettle, and the desulfurization waste liquid is also concentrated and crystallized by using the low pressure saturated steam to produce mixed salt, the method has features of low investment, low energy consumption which is only 30%-40% of that of direct hot air drying and no exhaust emission.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing sodium pyrosulfite by using coking desulfurization waste liquid and crude sulfur. Background technique [0002] Coking gas is desulfurized by the HPF wet liquid-phase catalytic method using ammonia as the alkali source, and a large amount of sulfur foam and desulfurization waste liquid will be generated during the desulfurization process. At present, most of the sulfur foam is recovered from wet sulfur by pressure filtration, which is placed in the storage yard to form solid waste, or solid sulfur is recovered by melting sulfur stills. Due to the high content of impurities in the recovered sulfur, comprehensive utilization is very difficult, and the sales of by-products are greatly affected. restrict. [0003] The waste liquid produced in the desulfurization process contains a large amount of toxic and harmful substances, the main components of which are t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14
CPCC01D5/145
Inventor 朱华东高志军李建温华张宏亮孟亚杰
Owner 朱华东
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