METHOD FOR PRODUCING SODIUM SULFITE BY REMOVING SULFUR FROM SULFUR-CONTAINING FLUE GAS USING INDUSTRIAL ALKALI RESIDUE CONTAINING ARSENIC - YANXIN ENVIRONMENTAL PROTECTION AND TECH CO LTD

Title:

METHOD FOR PRODUCING SODIUM SULFITE BY REMOVING SULFUR FROM SULFUR-CONTAINING FLUE GAS USING INDUSTRIAL ALKALI RESIDUE CONTAINING ARSENIC

Document Type and Number:

WIPO Patent Application WO/2020/133210

Kind Code:

A1

Abstract:

Provided is a method for producing sodium sulfite by removing sulfur from sulfur-containing flue gas using industrial alkali residue containing arsenic, comprising, circulating and slurrying the industrial alkali residue containing arsenic with water, then performing pressure filtration, purifying the filtrate by adding excessive amount of lime to precipitate arsenic and adding a sodium sulfide solution, then performing pressure filtration, adding the alkali solution in the desulfurization absorption tower to absorb and desulfurize the flue gas containing sulfur, performing pressure filtration to obtain a clear solution containing sodium sulfite and sodium sulfate; adding appropriate amount of SO 2 and excessive amount of lime to this clear solution to reduce the sodium sulfate in the clear solution to sodium bisulfite, after performing pressure filtration, adding sodium hydroxide solution in the resulting filtrate to adjust the pH value so as to convert sodium bisulfite to sodium sulfite; finally, performing supersaturated crystallization by evaporation, dehydrating by centrifugation, drying the crystal to obtain a sodium sulfite product with mass concentration≥90%.

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JPH02199018	PRODUCTION OF SODIUM SULFITE

Inventors:

SHI HONGJIAO (CN)
YUAN DONGHUA (CN)
SHI RENZHANG (CN)
LIANG JINFENG (CN)
SHI JUNYANG (CN)
WANG QIN (CN)

Application Number:

PCT/CN2018/124857

Publication Date:

July 02, 2020

Filing Date:

December 28, 2018

Export Citation:

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Assignee:

YANXIN ENVIRONMENTAL PROTECTION AND TECH CO LTD (CN)

International Classes:

C01D5/14; B01D53/48; C22B13/02; C22B30/04

Foreign References:

CN107963642A	2018-04-27
CN106756059A	2017-05-31
CN101899574A	2010-12-01
US5820966A	1998-10-13
CN106893864A	2017-06-27

Attorney, Agent or Firm:

CHANGSHA ZONEKEY PATENT LAW FIRM (CN)

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