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Method for producing sodium metasilicate pentahydrate

A technology of sodium metasilicate pentahydrate and its production method, which is applied in the direction of silicate, alkali metal silicate, etc., can solve the problems of difficult removal of impurities, small application scale and scope, and difficult control, etc., and achieve large-scale Large-scale application, reduced energy consumption, and easy control effects

Active Publication Date: 2016-05-04
SANXIANG ADVANCED MATERIALS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The production method of sodium metasilicate pentahydrate disclosed in the above-mentioned patent is to use quartz sand with a silicon dioxide content of 99.3-100% and caustic soda with a sodium oxide content of 45-50% as reaction raw materials, and impurities are still difficult to remove and process The process is difficult to control, so the application scale and scope are small

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  • Method for producing sodium metasilicate pentahydrate

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Embodiment 1

[0033] The production method of sodium metasilicate pentahydrate of the present embodiment, its concrete steps are:

[0034] 1. Purification: Purify the micro-silicon powder with a purity of 96% collected from the production of fused zirconia, and use rapid sedimentation separation, dilute acid leaching, cleaning and other processes to remove the pipe iron filings and ZrO contained in the micro-silicon powder 2 、Al 2 o 3 , Fe 2 o 3 , CaO, MgO and other impurities, the main component SiO 2 content increased to more than 99%;

[0035] 2. Mixing: Add sodium hydroxide into the microsilica powder slurry, make the lye concentration of 38% according to the proportion, stir and mix;

[0036] 3. Reaction: Heat the reactor to 60°C for 60 minutes;

[0037] 4. Filtration: filter the reacted material with a filter press, and return the filter residue to the reactor to continue the reaction;

[0038] 5. Modulus adjustment: adjust the filtered clear liquid, and the adjusted modulus of t...

Embodiment 2

[0042] The production method of sodium metasilicate pentahydrate of the present embodiment, its concrete steps are:

[0043] 1. Purification: Purify the micro-silicon powder with a purity of 90% collected from the production of fused zirconia, and use rapid sedimentation separation, dilute acid leaching, cleaning and other processes to remove the pipe iron filings and ZrO contained in the micro-silicon powder 2 、Al 2 o 3 , Fe 2 o 3 , CaO, MgO and other impurities, the main component SiO 2 content increased to more than 99%;

[0044] 2. Mixing: Add sodium hydroxide into the microsilica powder slurry, make the lye concentration of 38% according to the proportion, stir and mix;

[0045] 3. Reaction: Heat the reactor to 80°C for 30 minutes;

[0046] 4. Filtration: filter the reacted material with a filter press, and return the filter residue to the reactor to continue the reaction;

[0047] 5. Modulus adjustment: adjust the filtered clear liquid, and the adjusted modulus of...

Embodiment 3

[0051] In the production method of sodium metasilicate pentahydrate in this embodiment, solid sodium hydroxide, microsilica powder and water are mixed to obtain a mixed solution with a sodium hydroxide mass concentration of 37%, and the mixed solution is placed at 60°C React for 30 minutes, then filter the reacted mixed solution, add the filtered filter residue into the mixed solution to continue to participate in the reaction, take the filtered clear liquid to adjust the mold, adjust the modulus to 0.6, and adjust the mold The supernatant liquid was crystallized by adding seeds at 40° C. to obtain the sodium metasilicate pentahydrate. The obtained sodium metasilicate pentahydrate was concentrated to a solid content of 56%, followed by solid-liquid separation and drying in sequence, and the drying temperature was 60°C.

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Abstract

The invention relates to a method for producing sodium metasilicate pentahydrate. Sodium hydroxide solid, silica fume and water are mixed, a mixed solution with the mass concentration of sodium hydroxide being 37-39% is obtained, the mixed solution is placed at the temperature of 60-80 DEG C for conducting a reaction for 30-90 minutes, then the mixed solution obtained after the reaction is filtered, filtered clear liquid is taken and subjected to modulus adjustment, the adjusted modulus is 0.6-1.6, the clear liquid obtained after modulus adjustment is subjected to crystallization at the temperature of 40-52 DEG C, and the sodium metasilicate pentahydrate is obtained. The method for producing the sodium metasilicate pentahydrate has the advantages that the reaction condition is convenient to control, and product quality is good.

Description

technical field [0001] The invention relates to the production technology of sodium metasilicate, in particular to a production method of sodium metasilicate pentahydrate. Background technique [0002] The conventional production method of sodium metasilicate is to use quartz sand and caustic soda as raw materials, mix a certain concentration of sodium hydroxide solution and quartz sand in a certain proportion, react at 100-150°C, and then carry out mold adjustment, crystallization and drying, etc. Process production, usually the particle size of quartz sand is between 100-325 mesh. In addition to the main production process using quartz sand as raw material, in the existing process, there is also wollastonite (mainly composed of CaSiO 3 ), polysilicon production waste (the main component is SiCl 4 ), waste silica gel, serpentine magnesium extraction residue, diatomite, waste glass, fly ash, aluminum sulfate waste residue extracted from bauxite, zirconium oxychloride by-pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32
CPCC01B33/32
Inventor 胡天喜叶旦旺范圣华包晓刚颜玉萍
Owner SANXIANG ADVANCED MATERIALS
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