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Method and system for extracting sodium sulfite and sodium sulfate from flue gas containing sulfur dioxide

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

Active Publication Date: 2022-07-01
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 and system for extracting sodium sulfite and sodium sulfate from flue gas containing sulfur dioxide
  • Method and system for extracting sodium sulfite and sodium sulfate from flue gas containing sulfur dioxide
  • Method and system for extracting sodium sulfite and sodium sulfate from flue gas containing sulfur dioxide

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Embodiment Construction

[0047] In order for 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 with reference to the accompanying drawings in the embodiments of the present invention.

[0048] In some of the processes described in the description and claims of the present invention and the above-mentioned drawings, various operations are included in a specific order, but it should be clearly understood that these operations may not be in accordance with the order in which they appear herein. Executed or executed in parallel, the sequence numbers of the operations, such as 100, 200, etc., are only used to distinguish different operations, and the sequence numbers themselves do not represent any execution order. Additionally, these flows may include more or fewer operations, and these operations may be performed sequentially or in parallel. It should be n...

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Abstract

The invention discloses a method and a system for extracting sodium sulfite and sodium sulfate from flue gas containing sulfur dioxide. The method comprises the following steps: collecting flue gas containing sulfur dioxide and treating to obtain a sulfur-containing solution; transferring the sulfur-containing solution to multi-stage evaporation in sequence and a three-in-one separator to obtain a sodium bisulfite solution and a filter cake, respectively, and the filter cake contains sodium sulfate; neutralize the sodium bisulfite solution to obtain sodium sulfite; dissolve and centrifuge the filter cake to obtain Sodium sulfate. The method for extracting sodium sulfite and sodium sulfate from flue gas containing sulfur dioxide provided by this application, by adding a multi-stage evaporator and a three-in-one separator before the neutralization stage, utilizes the difference in solubility of sodium bisulfite and sodium sulfate, The temperature-controlled negative pressure concentration is achieved in the multi-stage evaporator, and the Na is completed in the three-in-one separator. 2 SO 4 The enrichment of crystals not only achieves the recycling of industrial waste, but also solves the problem of Na in traditional processes. 2 SO 4 Difficulty eliciting the problem of separation.

Description

technical field [0001] The invention relates to the technical fields of environmental protection and industrial waste treatment, and more particularly, to a method and a 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 exists as an impurity, because there is no suitable outlet, it is difficult to be raised 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 smelting process of copper, environmental flue gas that is harmful to the environment will inevitably escape. 2 ) is about 3%. In general, the ambient flue gas will be transported to the water desulfurization system through the collection hood and the fan respectively. [0004] In order to reduce the adverse effects of sulf...

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Application Information

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Patent Type & Authority Patents(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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