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Preparation of magnesium hexasilicate

A magnesium hexasilicate and sodium silicate solution technology, which is applied in the direction of magnesium silicate, silicate, and separation methods, can solve the problems of short double decomposition process flow, long production process flow, and low product strength, and achieve production The effect of simple process, stable product quality and convenient operation

Inactive Publication Date: 2005-03-16
陶华西
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  • Application Information

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Problems solved by technology

[0004] In above-mentioned three kinds of preparation methods: double decomposition process technological process is shorter, and production cost is lower, but the quality of product is relatively poor, can only be used as general adsorbent; Although the magnesium hexasilicate quality that two-step method makes is higher, Due to the long production process of this method, the production cost is relatively high; the solution method has improved compared with the previous two methods, but it is still in the small test stage, and the product produced is not high in strength, and the cost is relatively high.

Method used

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  • Preparation of magnesium hexasilicate

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Effect test

Embodiment 1

[0016] 874g of magnesium sulfate heptahydrate is formulated into a solution with a magnesium oxide concentration of 4.0%, then 2000g of water glass with a modulus of 3.5 is added, the pH value is adjusted to 8.9, and after the temperature rise and heat preservation reaction, 10g of polyacrylamide with a molecular weight of 7.5 million is added As a flocculant, it is then centrifuged to obtain wet magnesium hexasilicate, and then sprayed and granulated to obtain white magnesium hexasilicate particles.

Embodiment 2

[0018] It is 3.0% solution that 874g magnesium sulfate heptahydrate is mixed with magnesium oxide concentration, then add 2200 g modulus and be 3.0 water glass, adjust pH value to 9.1, after carrying out heating and heat insulation reaction, add 8g molecular weight respectively 7,500,000 and 1,500 Wan's polyacrylamide mixture is used as a flocculant, centrifuged to obtain wet magnesium hexasilicate, and then sprayed and granulated to obtain white magnesium hexasilicate particles.

Embodiment 3

[0020] 874g of magnesium sulfate heptahydrate is prepared into a solution with a magnesium oxide concentration of 4.0%, and then 2000 g of water glass with a modulus of 3.5 is added to adjust the pH value to 9.1. Each 5g of polyacrylamide was used as a flocculant, and then centrifuged to obtain wet magnesium hexasilicate, then 0.8g of polyethylene glycol was added as a strength improver, and white magnesium hexasilicate particles were obtained through spray granulation.

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Abstract

A process for preparing magnesium hexasilicate includes such steps as preparing the solution of soluble magnesium salt, mixing with the solution of sodium silicate, reacting, cooling, adding flocculant, mixing, centrifugal separating, washing to obtain wet magnesium hexasilicate, adding strength improver, and drying to obtain white magnesium hexasilicate particles. Its advantages are high strength and granular uniformity, low energy consumption and high output rate.

Description

technical field [0001] The invention relates to a preparation method of magnesium hexasilicate, belonging to the technical field of silicate preparation in inorganic chemistry. Background technique [0002] Magnesium hexasilicate, the molecular formula is 2MgO 6SiO 2 ·xH 2 O, is an amorphous particle with a porous structure and a large pore volume. It has both acid and alkali adsorption properties and cation exchange capacity, and can adsorb alkaline pigments. It is widely used in the chemical industry to remove trace impurities in organic products, especially for the adsorption of pigments and odors in organic products. In addition, it can also be used in medicine, hygiene, food additives and other fields. [0003] There are three main methods for preparing magnesium hexasilicate: one is the metathesis method, that is, the soluble magnesium salt is prepared into a solution, and then directly mixed with the sodium silicate solution for reaction, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D21/01C01B33/22
Inventor 陶华西何建丽张华湘冯军
Owner 陶华西
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