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Method for mechanochemically synthesizing magnesium lithium silicate

A technology for synthesizing magnesium silicate and mechanochemistry, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve problems such as difficulties in large-scale production of lithium magnesium silicate, high input and operating costs, and increased viscosity of materials , to achieve the effects of low cost, shortened reaction time, and improved production efficiency

Active Publication Date: 2015-07-08
CHINA UNIV OF GEOSCIENCES (WUHAN) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional hydrothermal reaction synthesis of magnesium lithium silicate consumes a lot of energy and takes a long time, and requires large-capacity high-pressure equipment, which has huge input and operating costs; in addition, due to the limitation of hydrothermal reactor equipment, it can only be produced intermittently; and As the reaction progresses, the viscosity of the material in the kettle increases, making it difficult to stir and homogenize, resulting in uneven product quality and low yield
These problems have brought difficulties to the large-scale production of lithium magnesium silicate

Method used

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  • Method for mechanochemically synthesizing magnesium lithium silicate
  • Method for mechanochemically synthesizing magnesium lithium silicate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Precursor preparation:

[0039] (1) 860g water glass (SiO 2 28wt%,Na 2 (09wt%, modulus 3.22) is dissolved in 4L water, then adds 162g H rapidly while stirring 2 SO 4 ;

[0040] (2) 560g MgCl 2 ·6H 2 O dissolved in 1L of water;

[0041] (3) Add the solution of step (2) into the slurry obtained in step (1), and stir evenly;

[0042] (4) Keep stirring continuously and slowly add 2.4L of 3N NaOH solution to make coprecipitation precursor slurry;

[0043] (5) centrifuging the co-precipitation precursor slurry, and fully washing the centrifuged filter cake with clear water to obtain the washed slurry;

[0044] (6) 14.5g LiOH·H 2 O is dissolved in 200g of water;

[0045] (7) Add the solution of step (6) into the slurry after washing in step (5), and stir evenly;

[0046] (8) Heating while stirring, so that the temperature of the system reaches 70° C. to obtain a precursor.

[0047]The prepared precursor was input into a nano ball mill, the grinding medium was zirco...

Embodiment 2

[0049] Precursor preparation:

[0050] (1) 800g water glass (SiO 2 12.5wt%, Na 2 O3.9wt%, modulus 3.54) was dissolved in 4L water, and then 143g HNO was added quickly while stirring 3 ;

[0051] (2) 530g MgSO 4 Dissolve in 1L of water;

[0052] (3) Add the solution of step (2) into the slurry obtained in step (1), and stir evenly;

[0053] (4) Keep stirring continuously and slowly add 1L of ammonia water to make co-precipitation precursor slurry.

[0054] (5) centrifuging the co-precipitation precursor slurry, and fully washing the centrifuged filter cake with clear water to obtain the washed slurry;

[0055] (6) 29.4g LiOH·H 2 O is dissolved in 400g of water;

[0056] (7) Add the solution of step (6) into the slurry after washing in step (5), and stir evenly;

[0057] (8) Heating while stirring, so that the temperature of the system reaches 30° C. to obtain a precursor.

[0058] The prepared precursor was input into a nano-sand mill, the grinding medium was yttrium-...

Embodiment 3

[0060] Precursor preparation:

[0061] (1) 880g water glass (SiO 2 12.5wt%, Na 2 (03.9wt%, modulus 3.54) is dissolved in 5L water, then adds 120g HCl rapidly while stirring;

[0062] (2) 620g Mg(NO 3 ) 2 Dissolve in 2L water;

[0063] (3) Add the solution of step (2) into the slurry obtained in step (1), and stir evenly;

[0064] (4) Keep stirring continuously and slowly add 2L of ammonia water to make co-precipitation precursor slurry.

[0065] (5) centrifuging the co-precipitation precursor slurry, and fully washing the centrifuged filter cake with clear water to obtain the washed slurry;

[0066] (6) 25g LiOH·H 2 O is dissolved in 400g of water;

[0067] (7) Add the solution of step (6) into the slurry after washing in step (5), and stir evenly;

[0068] (8) Heating while stirring, so that the temperature of the system reaches 50° C. to obtain a precursor.

[0069] The prepared precursor was input into a peeling machine, the grinding medium was zirconium silicate ...

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Abstract

The invention discloses a method for mechanochemically synthesizing magnesium lithium silicate, which comprises the following steps: 1) synthesizing a magnesium lithium silicate precursor, and controlling the temperature of the precursor at 30-99 DEG C; and 2) feeding the precursor into a wet-process superfine treatment device, grinding at 90-99 DEG C for 5-90 minutes, and drying the obtained slurry to obtain the target product magnesium lithium silicate. The diameter of the grinding medium spheres used by the wet-process superfine treatment device is 0.1-5mm, and the linear speed of the grinding medium spheres is 8-20 m / s. The magnesium lithium silicate is synthesized by using high temperature and high pressure instantaneously generated by the grinding medium, so the requirements for high temperature resistance and high pressure resistance of the device are low. The superfine treatment device in peculiar structure can perform continuous production, and can solve the problem in batch production in the traditional hydrothermal reaction kettle. Compared with the traditional hydrothermal synthesis, the method disclosed by the invention has the advantages of lower cost and higher safety, and can easily implement industrialization.

Description

technical field [0001] The invention relates to a method for mechanochemically synthesizing lithium magnesium silicate. Background technique [0002] Lithium magnesium silicate, also known as laponite, hectorite, hectorite, and Hectorite, is a trioctahedral layered silicate mineral belonging to the smectite family. Observed under an electron microscope, the crystal grains are in the form of irregular sheets, with a length and width of about 0.3 μm to 2.5 μm, and a thickness of about 15 nm to 230 nm, which is a typical two-dimensional nano-mineral material. Because of its special crystal structure and chemical composition, it has great gel-forming properties in water and can quickly expand. At a low solid content, it can form a high-viscosity, colorless and transparent tactile gel containing a large amount of water network structure. Denaturing gel. It has excellent colloidal dispersion, thickening, thixotropy, stability, adsorption and suspension properties, and is widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/20
Inventor 梅娟严春杰王洪权谌刚高黎霞杨建秀
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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