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Method for extracting sodium sulfite and sodium sulfate by using sulfur dioxide-containing flue gas and system

A technology of sodium sulfite and sulfur dioxide, applied in alkali metal sulfite/sulfite, chemical instruments and methods, preparation of alkali metal sulfite, etc., can solve problems such as affecting the content of anhydrous sodium sulfite

Active Publication Date: 2020-10-20
黄石加柯环保科技有限公司
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Problems solved by technology

[0002] In the production process of the traditional sodium subtraction process, sodium sulfate (Na 2 SO 4 ) usually exist as impurities, because there is no suitable outlet, so it is difficult to extract from the main industrial chemical anhydrous sodium sulfite, which directly affects the anhydrous sodium sulfite (Na 2 SO 3 ) content

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  • Method for extracting sodium sulfite and sodium sulfate by using sulfur dioxide-containing flue gas and system
  • Method for extracting sodium sulfite and sodium sulfate by using sulfur dioxide-containing flue gas and system
  • Method for extracting sodium sulfite and sodium sulfate by using sulfur dioxide-containing flue gas and system

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Embodiment Construction

[0047] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0048] In some processes described in the specification and claims of the present invention and the above-mentioned drawings, a plurality of operations appearing in a specific order are contained, but it should be clearly understood that these operations may not be performed in the order in which they appear herein Execution or parallel execution, the serial number of the operation, such as 100, 200, etc., is only used to distinguish different operations, and the serial number itself does not represent any execution order. Additionally, these processes can include more or fewer operations, and these operations can be performed sequentially or in parallel. It should be noted t...

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Abstract

The invention discloses a method for extracting sodium sulfite and sodium sulfate by using sulfur dioxide-containing flue gas and a system, and the method comprises the following steps: collecting thesulfur dioxide-containing flue gas, and treating to obtain a sulfur-containing solution; sequentially transferring the sulfur-containing solution into a multi-stage evaporator and a three-in-one separator to respectively obtain a sodium hydrogen sulfite solution and a filter cake which contains sodium sulfate; neutralizing the sodium hydrogen sulfite solution to obtain sodium sulfite; and dissolving the filter cake and carrying out centrifugal separation treatment to obtain sodium sulfate. The invention provides the method for extracting sodium sulfite and sodium sulfate by using the sulfur dioxide-containing flue gas. The method comprises the following steps: before a neutralizing step, the multi-stage evaporator and the three-in-one separator are additionally arranged; temperature control negative pressure concentration is achieved in the multi-stage evaporator by means of the solubility difference of sodium hydrogen sulfite and sodium sulfate, Na2SO4 crystals are enriched in the three-in-one separator, industrial waste is recycled, and the problem that Na2SO4 is difficult to lead out and separate in the traditional process is solved.

Description

technical field [0001] The invention relates to the technical field of environmental protection and industrial waste treatment, and more particularly relates to a method and system for extracting sodium sulfite and sodium sulfate from flue gas containing sulfur dioxide. Background technique [0002] In the production process of the traditional sodium subtraction process, sodium sulfate (Na 2 SO 4 ) usually exist as impurities, because there is no suitable outlet, so it is difficult to extract from the main industrial chemical anhydrous sodium sulfite, which directly affects the anhydrous sodium sulfite (Na 2 SO 3 ) content. [0003] In addition, in the copper smelting process, it is inevitable to escape the environmental flue gas which is harmful to the environment. The sulfur dioxide (SO 2 ) content is about 3%. In general, the ambient flue gas is sent to the water washing desulfurization system through the collection hood and fan respectively. [0004] In order to re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14C01D5/00
CPCC01D5/14C01D5/00C01P2006/80
Inventor 吴昊泉王杰邵雷
Owner 黄石加柯环保科技有限公司
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