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Method for producing sodium fluosilicate by sodium sulfite circulating mother liquor

A technology of sodium fluorosilicate and sodium sulfite, applied in the direction of silicate, alkali metal silicate, etc., to achieve the effect of reducing pollution and sewage treatment costs, and reducing tail gas treatment costs

Inactive Publication Date: 2012-01-18
湖南合磷化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no public report on the production of sodium fluorosilicate from waste liquid containing sodium sulfite, a by-product of flue gas desulfurization

Method used

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Examples

Experimental program
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Embodiment 1

[0021] Example 1: When the sulfuric acid tail gas treatment system circulates the absorption liquid to absorb to PH5.3~5.6, and the relative density is 1.24, the sodium bisulfite solution of this high concentration is about 8m 3 Send it to the neutralization tank, neutralize it with a sodium carbonate solution with a relative density of 1.20 to PH6.5~7.0; heat it indirectly with 0.4MPa steam until it boils, and stir to exhaust the CO 2 , adding caustic soda to adjust the pH of the solution to 12, so that NaHSO 4 All converted to Na 2 SO 3 , to prepare a sodium sulfite solution with a content of about 21%; add 0.53m of 93% sulfuric acid to the neutralization tank 3 At the same time, start the blower to stir and oxidize the mother liquor in the neutralization tank; when the sodium sulfate content in the neutralization tank reaches about 17%, add a small amount of NaS solution with a relative density of 1.12 to remove iron ions and heavy metal ions Activated carbon is decolori...

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PUM

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Abstract

The invention relates to a method for producing sodium fluosilicate by sodium sulfite circulating mother liquor, which comprises the following steps that: the sodium hydrosulfite solution is neutralized to a state that the pH value is 6.5 to 7.0 and is heated and stirred to exhaust all carbon dioxide, then, the quantity of the required sulfuric acid is calculated; then, the sulfuric acid with the purity being 93 percent is added into a neutralization tank, the air is added for stirring and oxidization; when the content of the sodium sulfate in the neutralization tank reaches about 17 percent, the impurities are removed, the materials are sent into a salt dissolving tank for preserving the heat by steam; during the synthesis, the fluosilicic acid is injected into a crystallization tank, then, sodium sulfate solution is added, and next, the mother liquor containing silica gel is sucked out by a mother liquor siphon; and washing water is added for stirring and material washing, and the materials are sent to be dried to obtain the sodium fluosilicate finished products. The method has the advantages that the mother liquor produced for producing the sodium fluosilicate is diluted acid containing sulfuric acid and can be used as auxiliary acid for producing calcium superphosphate in the phosphatic fertilizer production, the pollution in the sodium fluosilicate production and the sewage treatment cost are reduced, and simultaneously, the tail gas treatment cost in industrial sulfuric acid production and the fluosilicic acid production cost are also reduced.

Description

technical field [0001] The invention relates to a production method of sodium fluorosilicate, in particular to a method for producing sodium fluorosilicate by using sodium sulfite to circulate mother liquor. Background technique [0002] Sodium fluorosilicate is an important inorganic chemical product. It has a wide range of uses in agriculture and industry, such as pesticides, wood preservation and acid-resistant cement. [0003] According to different sources of fluosilicic acid, the raw material for producing sodium fluorosilicate, the production methods are divided into fluorite method and phosphate rock method. The world's fluorine resources mainly come from fluorspar and phosphate rock. Fluorspar is only concentrated in a few countries, with proven reserves of 65 million tons and consumed at a rate of 4 million tons per year, so resources are limited. The associated fluorine in phosphate rock is generally about 3%, but accounts for more than 90% of the world's fluor...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 覃爱平唐远财侯益宏
Owner 湖南合磷化工有限公司
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