The preparation method of lithium magnesium silicate

A technology of lithium magnesium silicate and magnesium sulfate, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as uneven chelation degree of lithium magnesium silicate, unstable batch quality, and hard texture

Active Publication Date: 2020-10-27
广州博峰化工科技有限公司
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Problems solved by technology

[0003] The synthesis method of magnesium lithium silicate is mainly hydrothermal synthesis method, which mixes soluble silicate and magnesium lithium oxide in proportion, and then reacts under high temperature and high pressure conditions for a long time, but the long time high temperature and high pressure conditions are easy cause potential safety hazards, and the produced lithium magnesium silicate also has the problems of uneven chelation, too hard texture, and unstable quality between batches. It is necessary to find a normal pressure reaction, high safety, and can be applied to large The preparation method of the lithium magnesium silicate of range, large-scale production
Chinese patent CN106745013A discloses a lithium magnesium silicate compound and its preparation method. Although it uses normal pressure reaction to avoid the safety hazards of long-term high-temperature and high-pressure conditions, on the one hand, it does not use high-pressure conditions in the preparation method. The combination of normal pressure conditions and other parameter control, and on the other hand, the selection of raw materials and their proportions have not achieved the optimal conditions, resulting in the production of lithium magnesium silicate still has uneven chelation degree, batch The problem of unstable quality between times

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  • The preparation method of lithium magnesium silicate
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preparation example Construction

[0022] A kind of preparation method of lithium magnesium silicate is provided in the specific embodiment of the present invention, comprises the following steps:

[0023] (1) In a reaction kettle, dissolve lithium chloride in water, heat to boiling, and keep boiling for 2 to 4 minutes; add magnesium sulfate solution, and keep boiling for 18 to 22 minutes; preferably, in the lithium chloride and magnesium sulfate, The molar ratio of lithium to magnesium is (0.9~1.1):1; (2) Liquid water glass is added dropwise to the reactor at a constant speed; preferably, the speed of said constant dropwise addition is: 0.4kg / min~0.6kg / min min; (3) Add the sodium carbonate solution dropwise to the reaction kettle at a constant speed; (4) After the dropwise addition, keep boiling and react for 17-20 hours to obtain the product;

[0024] Further preferably, the molar ratio of the silicon, lithium and magnesium is (2-4):(0.9-1.1):1; the molar ratio of the sodium carbonate to the lithium chloride ...

Embodiment 1

[0030] This embodiment provides a kind of preparation method of lithium magnesium silicate, and main raw material comprises:

[0031] Food grade magnesium sulfate heptahydrate (MgSO 4 ·7H 2 O), water glass (liquid, water-soluble sodium silicate, modulus ratio is 3), lithium chloride (LiCl), edible sodium carbonate (Na 2 CO 3 );

[0032] The preparation steps are as follows:

[0033] a. Completely dissolve 29.6kg of magnesium sulfate heptahydrate with 130kg of deionized water, and set aside.

[0034] b. In a 1000L reaction kettle containing a condensing reflux system and a heating system, add 5.18kg of lithium chloride, add 50kg of water, heat and stir, and keep boiling for 3 minutes, then add magnesium sulfate solution, keep boiling for 20 minutes, and the reaction kettle is at Keep boiling and stirring continuously throughout the production process.

[0035] c. Add 36.65kg of water glass into the dropping tank, and evenly add it dropwise in the reaction kettle, and cont...

Embodiment 2

[0042] This embodiment provides a preparation method of lithium magnesium silicate. The raw material and preparation method are basically the same as in Example 1, and the difference is that, among the raw materials used, the modulus ratio of water glass is 4. The remaining raw materials, preparation steps and conditions are the same.

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Abstract

The invention provides a preparation method of magnesium lithium silicate. The method comprises the steps as follows: in a reactor, dissolving lithium chloride in water, heating the solution to be boiled for 2-4 min, adding a magnesium sulfate solution and keeping boiling for 18-22 min; (2) dropwise adding liquid sodium silicate to the reactor at constant speed of 0.4-0.6 kg / min preferably; (3) dropwise adding a sodium carbonate solution to the reactor at constant speed; (4) after addition, keeping boiling for a reaction for 17-20 h to obtain magnesium lithium silicate. The prepared magnesiumlithium silicate forms a stable crystal structure, has a stable chemical structure and a firm multi-molecular space structure and realizes stable thickening, thixotropy, suspension and anti-settling effects of a waterborne rheology aid.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a preparation method of lithium magnesium silicate. Background technique [0002] Lithium magnesium silicate, CAS No.37220-90-9, molecular formula: Li 2 Mg 2 o 9 Si 3 , belongs to bentonite montmorillonite, hexagonal crystal structure, white powder appearance, non-toxic, tasteless, often used as thickener, suspending agent, anti-sedimentation agent, adhesive, thixotropic agent and dispersant. Its hydrated gel has excellent rheology and has been widely used in medicine, cosmetics, coatings, pesticides, toys, etc. [0003] The synthesis method of magnesium lithium silicate is mainly hydrothermal synthesis method, which mixes soluble silicate and magnesium lithium oxide in proportion, and then reacts under high temperature and high pressure conditions for a long time, but the long time high temperature and high pressure conditions are easy cause potential safety hazards, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/20
CPCC01B33/20
Inventor 陈琮吴海峰吴文昌陈琼李娟陈剑沈旺辉李涛
Owner 广州博峰化工科技有限公司
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