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Hydro-thermal synthesis method of high-transmittance nano-scale magnesium lithium silicate

A technology of magnesium lithium silicate and high light transmittance, which is applied in the direction of nanotechnology, silicon compounds, chemical instruments and methods, etc., can solve the problems that are not conducive to human health and ecological environmental protection, the electronegativity of magnesium lithium silicate structure is not strong, Problems such as thickening, thixotropy, and poor adsorption can achieve the effects of low production cost, low production safety risk, and strong market competitiveness

Active Publication Date: 2016-07-27
JIANGSU HEMINGS NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Basically, high-temperature and high-pressure processes are used, so not only energy consumption is high, but also production and operation risks are extremely high
[0007] (2) The use of highly toxic fluorine salts in the production process is extremely detrimental to the health of personnel and environmental protection
[0008] (3) There are many impurities in the product, especially the electronegative structure of magnesium-lithium silicate is not strong, so the indicators of thickening, thixotropy and adsorption are poor, and the scope of application is greatly limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. First, high-purity sodium-based montmorillonite (provided by Inner Mongolia Ningcheng Tianyu Bentonite Technology Co., Ltd., with a purity of 98%; the same below) is added to dilute hydrochloric acid with a concentration of 0.01mol / L and soaked for 10mim; then filtered (no washing required) ), the filter cake was roasted at 150°C for 15mim.

[0038] 2. Dissolve lithium sulfate and sodium carbonate in water first, then add roasted acidified montmorillonite powder, and react at 60°C for 1 hour. Control in this step: m(Li) / m(montmorillonite)=0.3, m(Na) / m(montmorillonite)=1.1.

[0039] 3. Finally, without filtering and washing, the reactant is fully dried at 110-150°C until the water content is not higher than 2% to obtain Lithium Magnesium Silicate 1#.

Embodiment 2

[0041] 1. First, add high-purity sodium-based montmorillonite into dilute sulfuric acid with a concentration of 0.01mol / L and impregnate 5mim; then filter (without washing), and roast the filter cake at 130°C for 10mim.

[0042] 2. Dissolve lithium sulfate, lithium hydroxide monohydrate, sodium sulfate and sodium carbonate in water first, then add roasted acidified montmorillonite powder, and react at 95°C for 3 hours. Control in this step: m(Li) / m(montmorillonite)=0.7, m(Na) / m(montmorillonite)=2.8.

[0043] 3. Finally, without filtering and washing, the reactant is fully dried at 110-150°C until the water content is not higher than 2% to obtain lithium magnesium silicate 2#.

Embodiment 3

[0045] 1. First, add high-purity sodium-based montmorillonite into dilute sulfuric acid with a concentration of 0.01mol / L and impregnate 10mim; then filter (without washing), and roast the filter cake at 180°C for 10mm.

[0046] 2. Dissolve lithium sulfate, lithium hydroxide monohydrate, lithium chloride monohydrate, sodium hydroxide, sodium sulfate and sodium carbonate in water first, then add roasted acidified montmorillonite powder, and react at 70°C for 2 hours . Control in this step: m(Li) / m(montmorillonite)=0.6, m(Na) / m(montmorillonite)=2.0.

[0047] 3. Finally, without filtering and washing, the reactant is fully dried at 110-150°C until the water content is not higher than 2% to obtain lithium magnesium silicate 3#.

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Abstract

The invention discloses a hydro-thermal synthesis method of high-transmittance nano-scale magnesium lithium silicate. The hydro-thermal synthesis method is characterized by comprising steps as follows: firstly, montmorillonite is acidized and calcined; then, water-soluble lithium salt and water-soluble sodium salt are added, the matching ratio is adjusted, and the amount of substances of all elements in a reaction system meets the proportional relation: 0.2<m(Li) / m(montmorillonite)<0.8, 1<m(Na) / m (montmorillonite)<3; finally, the mixture is subjected to a reaction at the temperature of 60-95 DEG C for 1-3 h and fully dried at the temperature of 110-150 DEG C until the water content is not higher than 2%, and magnesium lithium silicate is prepared. Defects in the prior art are overcome, and the safe, environment-friendly, efficient and low-cost synthesis method of nano-scale magnesium lithium silicate is provided; according to the synthesis method, high-purity montmorillonite which has vast reserves in the natural world is taken as a starting raw material, and the nano-scale magnesium lithium silicate with high transmittance, excellent thickening and thixotropy and high adsorption force is produced by optimizing technological parameters of production and the ratio of reaction raw materials.

Description

technical field [0001] The invention relates to the technical field of synthesis of smectite mineral magnesium-lithium silicate, in particular to a nano-scale synthesis method of magnesium-lithium silicate with excellent rheological properties, fast hydration dispersion speed and high light transmittance. Background technique [0002] In mineralogy, smectite minerals (smectite) contain two octahedral subfamily and three octahedral subfamily; among them, montmorillonite (montmorillonite, also known as "montmorillonite"; although it can be artificially synthesized, it is mainly derived from Extracted from bentonite) belongs to the 2-octahedral subfamily, while magnesium lithium silicate (hectorite, commonly known as "hectorite") belongs to the 3-octahedral subgroup. Both montmorillonite and lithium magnesium silicate structures exhibit strong electron-deficiency and strong electronegative structures, so a certain amount of cations such as Na+, Ca2+, and Mg2+ need to be absorbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/20B82Y40/00
CPCC01B33/20C01P2006/82
Inventor 张天志张天毅
Owner JIANGSU HEMINGS NEW MATERIALS TECH CO LTD
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