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Method for preparing sodium silicate from fluorine-containing silica gel

A technology of sodium silicate and silica gel, applied in the direction of silicate, alkali metal silicate, etc., can solve the problems of difficult recovery of fluorine, difficult to obtain products, difficult reaction, etc., and achieves low cost, good reactivity and high quality. Good results

Active Publication Date: 2009-06-24
WENGFU (GRP) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has poor activity, and it is difficult to react with NaOH solution under normal pressure or pressurized conditions. At the same time, because it contains a large amount of fluorine, it is difficult to produce products that meet the national standards according to the aforementioned various methods, and fluorine is also difficult to recycle. It cannot be directly As a raw material for the preparation of sodium silicate
Fluorine-containing silica gel can neither be used as a filler in rubber or other fields because it contains a large amount of fluorine, and stacking will cause environmental pollution

Method used

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  • Method for preparing sodium silicate from fluorine-containing silica gel
  • Method for preparing sodium silicate from fluorine-containing silica gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Dissolution of fluorine-containing silica gel: In the first dissolution kettle with a stirring and heating device, continuously add fluorine-containing silica gel (SiO 2 Content 20%, F - content 8.0%, 650kg / h) and ammonium fluoride solution (weight concentration 30%, 2360kg / h); the slurry overflows into the second dissolution kettle with stirring and heating device, the first dissolution kettle and the second dissolution kettle Keep the slurry boiling for a total residence time of 2 hours;

[0022] (2) Preparation of active silica: the ammonium fluorosilicate solution in the second dissolution kettle directly overflows to the first precipitation kettle with a cooling jacket, and the released from the first dissolution kettle and the second dissolution kettle during the dissolution process, The ammonia condensed and dewatered by the condenser is also passed into the first precipitation tank, the temperature of the slurry in the precipitation tank is controlled at 50...

Embodiment 2

[0026] (1) Dissolution of fluorine-containing silica gel: In the first dissolution kettle with a stirring and heating device, continuously add fluorine-containing silica gel (SiO 2 Content 34.32%, F - content 10.17%, 430kg / h) and ammonium fluoride solution (concentration 30%, 4000kg / h); the slurry overflows to the second dissolution tank with stirring and heating device, the first dissolution tank and the second dissolution tank Keep the slurry boiling for a total residence time of 1 hour;

[0027](2) Preparation of active silica: the ammonium fluorosilicate solution in the second dissolution tank directly overflows to the first precipitation tank with a cooling jacket, and the ammonia released from the dissolution tank during the dissolution process and condensed to remove water by the condenser It is also passed into the first precipitation tank, the temperature of the slurry in the precipitation tank is controlled at 60 °C, the slurry in the first precipitation tank overfl...

Embodiment 3

[0031] (1) Dissolution of fluorine-containing silica gel: In the first dissolution kettle with a stirring and heating device, continuously add fluorine-containing silica gel (SiO 2 Content 40%, F - content 12%, 210kg / h) and ammonium fluoride solution (concentration 20%, 3700kg / h); the slurry overflows to the second dissolution tank with stirring and heating device, the first dissolution tank and the second dissolution tank The slurry kept boiling with a total residence time of 1.1 hours;

[0032] (2) Preparation of active silica: the ammonium fluorosilicate solution in the second dissolution tank directly overflows to the first precipitation tank with a cooling jacket, and the ammonia released from the dissolution tank during the dissolution process and condensed to remove water by the condenser It is also passed into the first precipitation tank, the temperature of the slurry in the precipitation tank is controlled at 40°C, the slurry in the first precipitation tank overflow...

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Abstract

The invention discloses a method for preparing sodium silicate from fluorine-containing silica gel. The method comprises the following steps that: active silica is prepared by dissolving, ammoniating and precipitating fluorine-containing silica gel; the active silica is directly added into an alkali dissolution groove, added with metered sodium hydroxide and water, heated and dissolved; after slurry become clear, the slurry is added with activated charcoal accounting for 0.05 to 0.1 percent of the weight (SiO2) of the active silica, reacts for 15 minutes, and then is filtered; and filtrate is concentrated to specified concentration through a concentration groove so as to obtain sodium silicate products with the modulus between 2.2 and 3.6. The method has the advantages of mild process conditions, low production cost, easy realization of industrial production, and recycling of both fluorine and silica.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for producing sodium silicate. Background technique [0002] Sodium silicate is an inorganic chemical product with a wide range of uses. The production method of sodium silicate is divided into dry method and wet method. The dry method is divided into sodium carbonate method and sodium sulfate method according to different raw materials. Reaction with sodium carbonate or sodium sulfate in a melting furnace, which is characterized in that sodium silicate products with different moduli can be prepared according to needs, but consumes a lot of energy; the wet method is to react sodium hydroxide solution and silicon dioxide at high temperature , although the energy consumption is lower than that of the dry method, the modulus of the prepared sodium silicate is lower, generally below 2.8. [0003] Chinese Patent Publication No. CN1342603 discloses "a production method of sod...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 白瑞瑜陆凤英刘松林冯胜波骆吉林
Owner WENGFU (GRP) CO LTD
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