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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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, a

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
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Example Embodiment

[0020] Example 1:

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

[0022] (2) Preparation of active silica: the ammonium silicofluoride solution in the second dissolving tank directly overflows to the first precipitation tank with a cooling jacket, and it is discharged from the first dissolving tank and the second dissolving tank during the dissolution process. The ammonia condensed and removed by the condenser is also passed into the first precipitation tank, the temperature of the precipitation tank slurry is controlled at 50°C, the fi...

Example Embodiment

[0025] Example 2:

[0026] (1) Dissolving fluorine-containing silica gel: In the first dissolving kettle with 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 dissolving tank with stirring and heating device, the contents of the first dissolving tank and the second dissolving tank The slurry keeps boiling, the total residence time is 1 hour;

[0027](2) Preparation of active silica: the ammonium silicofluoride solution in the second dissolving tank directly overflows to the first precipitation tank with cooling jacket, and the ammonia discharged from the dissolving tank during the dissolution process and condensed and dewatered by the condenser Also enter the first precipitation tank, the temperature of the precipitation tank slurry is controlled at 60°C, the slurry in the first precipitation tank overflows...

Example Embodiment

[0030] Example 3:

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

[0032] (2) Preparation of active silica: the ammonium silicofluoride solution in the second dissolving tank directly overflows to the first precipitation tank with cooling jacket, and the ammonia discharged from the dissolving tank during the dissolution process and condensed and dewatered by the condenser Also enter the first precipitation tank, the temperature of the slurry in the precipitation tank is controlled at 40°C, the slurry in the first precipitation ta...

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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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