Method for producing sodium fluorosilicate through comprehensive utilization of sulphur-burning sulphuric acid tail gas and phosphoric acid tail gas

Method for producing sodium fluorosilicate through comprehensive utilization of sulphur-burning sulphuric acid tail gas and phosphoric acid tail gas

The invention provides a method for producing sodium fluorosilicate through comprehensive utilization of sulphur-burning sulphuric acid tail gas and phosphoric acid tail gas. The method includes the following steps that the sulphur-burning sulphuric acid tail gas is mixed with alkaline liquor to pre...

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Hauptverfasser: MENG FANMIN, DONG ENCHENG, LI QINGFENG, JIAO YANTAO, YU QINGMIN, XU SHUGUI
Format: Patent
Sprache:eng
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CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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creator MENG FANMIN
DONG ENCHENG
LI QINGFENG
JIAO YANTAO
YU QINGMIN
XU SHUGUI
description The invention provides a method for producing sodium fluorosilicate through comprehensive utilization of sulphur-burning sulphuric acid tail gas and phosphoric acid tail gas. The method includes the following steps that the sulphur-burning sulphuric acid tail gas is mixed with alkaline liquor to prepare sodium sulfite, and the sodium sulfite is oxidized into sodium sulfate; the phosphoric acid tail gas is mixed with water to prepare a fluosilicic acid aqueous solution; the fluosilicic acid aqueous solution and the sodium sulfate solution are mixed and reacted for 40-120 min at the temperature at which a curing reaction can happen, centrifuging is carried out, and the sodium fluorosilicate is obtained. The production method solves the problem about comprehensive utilization of sulfite produced by a sulfuric acid system and fluosilicic acid produced by a phosphoric acid system, and recycling of SO2 and fluoride is effectively achieved.
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The method includes the following steps that the sulphur-burning sulphuric acid tail gas is mixed with alkaline liquor to prepare sodium sulfite, and the sodium sulfite is oxidized into sodium sulfate; the phosphoric acid tail gas is mixed with water to prepare a fluosilicic acid aqueous solution; the fluosilicic acid aqueous solution and the sodium sulfate solution are mixed and reacted for 40-120 min at the temperature at which a curing reaction can happen, centrifuging is carried out, and the sodium fluorosilicate is obtained. The production method solves the problem about comprehensive utilization of sulfite produced by a sulfuric acid system and fluosilicic acid produced by a phosphoric acid system, and recycling of SO2 and fluoride is effectively achieved.</abstract><oa>free_for_read</oa></addata></record>
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subjects CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
title Method for producing sodium fluorosilicate through comprehensive utilization of sulphur-burning sulphuric acid tail gas and phosphoric acid tail gas
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