Method for preparing superfine alumina silicate

An ultra-fine aluminum silicate and bauxite technology, applied in aluminum silicate, silicate and other directions, can solve the problems of poor product quality, high raw material requirements, poor dispersibility, etc., to reduce production links, high product purity, Control the uniform effect

Active Publication Date: 2007-02-21
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the disadvantages of poor product quality, poor dispersibility, high raw material requirements, poor adaptability, etc. At the same time, a large amount of waste liquid is discharged, causing environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of superfine aluminum silicate of the present invention, carries out according to following steps successively:

[0029] (1) 500g of bauxite powder with particle size less than or equal to 70μm, Al 2 o 3 The weight content is 62%, its aluminum-silicon molar ratio is 5, and the evaporated carbon mother liquor with sodium carbonate content of 50g / l is divided according to Na 2 O / Al 2 o 3 = 1.3 After batching, add 5g of sintering auxiliary limestone powder with a particle size of 50 μm or less and 10 g of quartz sand powder with a particle size of 80 μm or less at the same time for secondary batching, and put it into the furnace for sintering reaction at a temperature of 1150 ° C. Time 2 hours, obtained clinker.

[0030] (2) The stripping conditions of burning clinker control are: temperature 80°C, time 1.2 hours, liquid-solid ratio control 10, and crude liquid is obtained after stripping.

[0031] (3) Add 25 g of calcined kaolin powder with a p...

Embodiment 2

[0036] The preparation method of superfine aluminum silicate of the present invention, carries out according to following steps successively:

[0037] (1) 500g of bauxite powder with a particle size of less than or equal to 100μm, the molar ratio of aluminum to silicon is 8, and the mother liquor of evaporated carbon is divided according to Na 2 O / Al 2 o 3 = 1.3 After batching, add 50g of sintering auxiliary limestone powder with a particle size of 30μm or less and 50g of quartz sand powder with a particle size of 60μm or less at the same time for secondary batching, and put it into the furnace for sintering reaction to obtain clinker .

[0038] (2) Same as Example 1, except that the stripping conditions are: temperature 90° C., time 0.8 hour, liquid-solid ratio controlled at 7, and crude liquid is obtained after stripping.

[0039] (3) Same as Example 1, except that 80 g of calcined kaolin powder is added, the synthesis temperature is controlled at 60° C., the synthesis ti...

Embodiment 3

[0044] As described in Example 1, the difference is:

[0045] (1) Add 500g of bauxite powder with a particle size of less than or equal to 90μm, and its aluminum-silicon molar ratio is 7, add 25g of limestone powder with a particle size of less than or equal to 60μm, and 25g of quartz sand powder with a particle size of less than or equal to 40μm for secondary The ingredients are put into the furnace for firing reaction to obtain clinker.

[0046] (2) Same as Example 1, except that the stripping conditions are: temperature 85° C., time 0.9 hour, liquid-solid ratio controlled at 9, and crude liquid is obtained after stripping.

[0047] (3) Same as Example 1, except that 50 g of calcined kaolin powder is added, the synthesis temperature is controlled at 55° C., the synthesis time is controlled at 0.9 hours, and the aging temperature is controlled at 65° C.

[0048] (4) with embodiment 1.

[0049] (5) With embodiment 1, difference is liquid-solid ratio control 11.

[0050] Oth...

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Abstract

This invention relates to a method for preparing ultrafine aluminum silicate. The method comprises: (1) mixing bauxite powder and sodium carbonate at Na2O/Al2O3 ratio of 1.2-1.6, adding limestone powder (1-10 wt.% of bauxite) and quartz sand powder (2-15 wt.% of bauxite), and calcining to obtain a clinker; (2) dissolving the clinker to obtain a crude solution; (3) adding one of calcined kaolin powder, amorphorus sodium aluminosilicate and ultrafine aluminum silicate (0.5-2 wt.% of the crude solution), synthesizing and aging; (4) filtering the aged reaction solution to obtain a filter cake; (5) washing the filter cake, drying, and pulverizing by air flow to obtain ultrafine aluminum silicate product. The method has such advantages as high adaptability of raw materials, high product quality and purity, good product dispersibility, no wastewater discharge and no pollution.

Description

technical field [0001] The invention relates to a method for preparing ultrafine aluminum silicate, which belongs to the synthesis technology of aluminum silicate compounds. Background technique [0002] Ultra-fine aluminum silicate is a synthetic silicon-aluminum compound with a particle size of less than or equal to 2 μm. It is an excellent pigment synergist. Ultra-fine aluminum silicate has good optical isolation. It can replace titanium dioxide in alkyd paint, acrylic exterior wall paint, powder paint, white primer, and white paint of road marking paint. Especially, it can replace 15-25% titanium dioxide or other pigments in indoor and outdoor matt semi-gloss latex paints, leather polishing pastes, printing pastes, and paper coatings, which can improve the appearance characteristics of coatings and reduce the cost of painting. Adding ultra-fine aluminum silicate into the paint has the effect of saving 15-25% of titanium dioxide, especially rutile titanium dioxide or oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26
Inventor 高建阳
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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