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Method for preparing high-purity montmorillonite

A montmorillonite, high-purity technology, applied in chemical instruments and methods, aluminum silicate, silicate, etc., can solve the problems of water and energy consumption, cumbersome sodium treatment, etc., to enhance suspension performance, improve purity and Good yield, dispersibility and suspension

Inactive Publication Date: 2006-07-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sodium treatment of this method is cumbersome, and the extrusion method needs aging to improve the dispersibility of bentonite, while the solution sodium treatment consumes water and energy, and the dispersibility of bentonite after treatment is limited.

Method used

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  • Method for preparing high-purity montmorillonite
  • Method for preparing high-purity montmorillonite
  • Method for preparing high-purity montmorillonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] ① Raw materials: Zhejiang Anji light green calcium-based bentonite ( figure 1 ), mainly composed of montmorillonite (M), quartz (Q), feldspar (F) and kaolinite (K), of which montmorillonite accounts for about 66%, kaolinite accounts for about 6%, and quartz accounts for about 21%, feldspar about 7%. The moisture content is about 10%. The raw ore is crushed to 325 mesh, and the whiteness is 71%.

[0042] ②Put 100 kg of the above-mentioned Anji bentonite powder, 5 kg of urea powder and 4 kg of sodium carbonate powder into a high-speed mixer, and mix at 1000r / min at 80°C for 30 minutes to obtain a hyperdispersible bentonite with an expansion rate of 50ml / g .

[0043] ③ Add super-dispersible bentonite to 900 kg of water and stir to make slurry.

[0044] ④ The bentonite slurry is centrifugally classified by a centrifuge to obtain a high-purity montmorillonite slurry.

[0045] ⑤ Add sulfuric acid to the high-purity montmorillonite slurry to adjust the pH value to 2-4, th...

Embodiment 2

[0048] ① Raw materials: choose gray-white sodium-based bentonite raw ore from Anji, Zhejiang ( image 3 ), mainly composed of montmorillonite (M), quartz (Q), feldspar (F) and kaolinite (K), of which montmorillonite accounts for about 77%, kaolinite accounts for about 5%, and quartz accounts for about 15%, and feldspar accounts for about 3%. The moisture content is about 10%. The raw ore is crushed to 325 mesh with a whiteness of 79%.

[0049] ② Mix 100 kg of bentonite powder, 5 kg of urea powder and 4 kg of sodium carbonate powder evenly, place in an oven, and bake at 70°C for 180 minutes to obtain a hyperdispersible bentonite with an expansion ratio of 95ml / g.

[0050] ③The super-dispersible bentonite is mixed with water according to the soil-water ratio of 800 kg to make slurry.

[0051] ④ The bentonite slurry is centrifugally classified by a centrifuge to obtain a high-purity montmorillonite slurry.

[0052] ⑤ Add sulfuric acid to the high-purity slurry to adjust the P...

Embodiment 3

[0055] ① Crush the bentonite to 325 mesh.

[0056] ②Put 100 kg of bentonite powder, 3 kg of urea powder and 10 kg of sodium fluoride powder in an oven, and bake at 130°C for 180 minutes to obtain a hyperdispersible bentonite with an expansion ratio of 60ml / g.

[0057] Other steps are with embodiment 2.

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Abstract

The invention relates to a process for preparing high-purity montmorillonite, which consists of mixing alta-mud powder, sodium salt powder, and urea powder homogeneously, charging water into dispersible alta-mud, stirring for pulping, and carrying out centrifugal classification. The weight ratio of alta-mud powder, sodium salt powder and urea powder is 1:0.02-0.1:0.03-0.2.

Description

technical field [0001] The invention relates to a preparation method of montmorillonite. Background technique [0002] Montmorillonite, also known as microcrystalline kaolinite, is a layered structure, flaky crystal silicate clay ore, named after it was first discovered in Montmorillonite, France. The composition of montmorillonite is (Na, Ca) 0.33 (Al, Mg) 2 [Si 4 o 10 ](OH) 2 ·nH 2 O, the water content varies greatly. The particles are fine, about 0.2-1 micron, with colloidal dispersion characteristics, usually produced in the form of lumps or soil-like aggregates. Observed under an electron microscope, the crystals are monoclinic and generally in the form of irregular flakes. The color is white with light gray, sometimes with light blue or light red, and the luster is dull; Mohs hardness is 2-2.5, specific gravity is 2-2.7, and the bulk density is 1-1.1g / mL. It has strong adsorption capacity and ion exchange capacity. At the same time, it also has a high degree ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/20C01B33/26
Inventor 严春杰谌刚陈洁渝
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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