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Co-production method of sodium metasilicate and sodium fluoride

A technology of sodium metasilicate and production method, applied in the directions of silicate, alkali metal fluoride, alkali metal silicate, etc., can solve the problem of the imminent recycling and utilization of fluorine-containing silicon slag, the strong corrosiveness of fluosilicic acid, There are no problems such as lattice fluorine, which achieves the effect of simple production process, low corrosiveness and convenient operation.

Inactive Publication Date: 2016-08-24
福建瓮福蓝天氟化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluorine has free fluorine and lattice fluorine in silicon slag. If it is directly stacked for a long time, lattice fluorine in fluorine-containing silicon slag will gradually precipitate from the silica lattice, and fluosilicic acid is highly corrosive and will cause environmental pollution. Pollution
At present, there is no recovery technology for lattice fluorine, and the resource recovery and utilization of fluorine-containing silicon slag is imminent
And the utilization of fluorine-containing silicon slag to recover fluorine and silicon resources to prepare sodium metasilicate has not yet been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A kind of production method of sodium metasilicate coproduction sodium fluoride, comprises the following steps:

[0014] (1) Mix the sodium hydroxide solution with a mass percentage concentration of 15% and the fluorine-containing silicon slag at a mass ratio of 1:1, stir and react for 15 minutes, and the mass percentage of fluorine in the fluorine-containing silicon slag is 5%;

[0015] (2) When the reaction temperature drops to 50°C, filter the mixed solution to obtain filter cake and filtrate respectively;

[0016] (3) The filter cake is washed successively by a sodium hydroxide solution with a mass percentage concentration of 15% and process water; the washing amount of the sodium hydroxide is 1.5 times the output of sodium fluoride, and the washing water amount of the process is fluoride 1.0 times of the sodium output; after washing, the filter cake is dried to a water content of 1.5% to obtain the sodium fluoride product;

[0017] (4) Adjust the filtrate to a mod...

Embodiment 2

[0019] A kind of production method of sodium metasilicate coproduction sodium fluoride, comprises the following steps:

[0020] (1) Mix the sodium hydroxide solution with a mass percentage concentration of 50% and the fluorine-containing silicon slag at a mass ratio of 6:1, stir and react for 150 minutes, and the mass percentage of fluorine in the fluorine-containing silicon slag is 25%;

[0021] (2) When the reaction temperature drops to 60°C, filter the mixed solution to obtain filter cake and filtrate respectively;

[0022] (3) Wash the filter cake successively through a sodium hydroxide solution with a mass percentage concentration of 5% and process water; the washing amount of the sodium hydroxide is 0.5 times the output of sodium fluoride, and the washing water amount of the process is fluoride 0.5 times of the sodium output; after washing, the filter cake is dried to contain no moisture, and the sodium fluoride product is obtained;

[0023] (4) Adjust the filtrate to a...

Embodiment 3

[0025] A kind of production method of sodium metasilicate coproduction sodium fluoride, comprises the following steps:

[0026] (1) Mix sodium hydroxide solution with a mass percentage concentration of 32.5% and fluorine-containing silicon slag at a mass ratio of 3.5:1, stir and react for 82.5 minutes, and the mass percentage of fluorine in the fluorine-containing silicon slag is 15%;

[0027] (2) When the reaction temperature drops to 55°C, filter the mixed solution to obtain filter cake and filtrate respectively;

[0028] (3) The filter cake is washed successively by a sodium hydroxide solution with a mass percentage concentration of 10% and process water; the washing amount of the sodium hydroxide is 1 times the output of sodium fluoride, and the washing water amount of the process is fluoride 0.75 times of the sodium output; after washing, the filter cake is dried to a water content of 0.75% to obtain the sodium fluoride product;

[0029] (4) Adjust the filtrate to a modu...

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Abstract

The invention discloses a co-production method of sodium metasilicate and sodium fluoride. The method comprises the following steps: a sodium hydroxide solution with the concentration being 15%-50% in percentage by mass and fluorine-containing silicon slag are mixed in the mass ratio being (1-6):1 and stirred to have a reaction for 15-150 min; after the reaction temperature is reduced to 50-60 DEG C, the mixed solution is filtered, and a filter cake and filtrate are obtained; the filter cake is washed with a sodium hydroxide solution with the concentration being 5%-15% in percentage by mass and process water sequentially and dried until the water content is 0-1.5% after washing, and a sodium fluoride product is obtained; the molar ratio of the filtrate is adjusted to be 1 with a conventional method, evaporated and concentrated until the concentration of sodium metasilicate is 55%-60% in percentage by mass and finally cooled, crystalized and dried with the conventional method, and a sodium metasilicate product is obtained. The co-production method has the characteristics of simple process, small device and little corrosion.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a production method for co-producing sodium fluoride with sodium metasilicate. Background technique [0002] Chinese Patent Publication No. CN101234763, titled "Method for preparing water glass and sodium metasilicate from silicon slag", disclosed on August 6, 2008 a method for preparing water glass by using silicon slag and sodium hydroxide as raw materials through reaction and concentration and metasilicate products, the process is simple; Chinese Patent Publication No. CN1772608, the name of the invention is "the method of producing sodium metasilicate pentahydrate by using industrial waste silica gel" on May 17, 2006, which disclosed a method of using industrial waste rubber The method for preparing sodium metasilicate pentahydrate through sodium hydroxide dissolution, decolorization, concentration, crystallization and drying has low cost. It can be see...

Claims

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Application Information

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IPC IPC(8): C01B33/32C01D3/02
CPCC01B33/32C01D3/02
Inventor 冯胜波包立华马泽基张启云曾娟娟
Owner 福建瓮福蓝天氟化工有限公司
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