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Drying method for superfine aluminium hydroxide

A technology of ultra-fine aluminum hydroxide and drying method, which is applied in chemical instruments and methods, inorganic chemistry, aluminum compounds, etc. It can solve problems such as poor fluidity, inability to use drying methods, and high initial viscosity, so as to ensure product quality and simplify operation , The effect of saving production costs

Inactive Publication Date: 2005-07-06
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high initial viscosity and poor fluidity of the industrial ultra-fine aluminum hydroxide filter cake, more effective drying methods such as spray drying have not been available in China in the past.

Method used

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  • Drying method for superfine aluminium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Send the ultra-fine aluminum hydroxide filter cake with a water content of 40% at 40°C to the beating tank, add ammonium polyacrylate with a weight of 0.36% on a dry basis of ultra-fine aluminum hydroxide, stir to make the filter cake become an easy-flowing slurry, and then The pump pumps it to the top of the drying tower (hot air inlet temperature 340°C) for atomization, and at the same time contacts with hot air for instant drying, and the dry material flows out from the bottom of the tower (outlet temperature 115°C), and the product is obtained after being dispersed, classified, and collected. Its moisture content is 0.08%.

Embodiment 2

[0016] Send the ultra-fine aluminum hydroxide filter cake with a water content of 45% at 35°C to the beating tank, add 0.42% ammonium polyacrylate of the ultra-fine aluminum hydroxide dry weight, stir to make the filter cake become an easy-flowing slurry, and then Pump it to the top of the drying tower (hot air inlet temperature 360°C) for atomization, and at the same time contact with hot air for instant drying, the dry material flows out from the bottom of the tower (outlet temperature 123°C), add 0.5% KH570 silane to the disperser , and then collected by classification, the product has a moisture content of 0.057%.

Embodiment 3

[0018] Send the ultra-fine aluminum hydroxide filter cake with a water content of 50% at 42°C to the beating tank, add 0.28% ammonium polyacrylate and 0.5% titanate based on the dry weight of ultra-fine aluminum hydroxide, and stir to make the filter cake easy The flowing slurry is then pumped to the top of the drying tower (hot air inlet temperature 370°C) for atomization, and at the same time it is in contact with hot air for instant drying, and the dry material flows out from the bottom of the tower (outlet temperature 120°C), after being dispersed and classified 1. The captured product has a water content of 0.067%.

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Abstract

A drying method for ultra-fine aluminium hydroxide provided by the present invention relates to a method for drying aquo powder material, more specifically, a method for drying ultra-fine aluminium hydroxide in industrial production. The method comprises the following steps: adding viscosity-reducing agent-ammonium polyacrylate, which is 0.02%-0.6% of the ultra-fine aluminium hydroxide dry basis by weight, into the hollander tub and shearing and stirring the ultra-fine aluminium hydroxide filter cake with it at the same time to prepare the feed pulp; pumping the feed pulp to the top of the drying tower in which the hot air inlet temperature is 200 to 380 degrees centigrade, atomizing it through centrifugal sprayer, and rapid-drying it by momentary contact with hot air, then dry material is separated with gas and flows out of the tower bottom, the outlet temperature of the tower bottom is controlled between 105 to 130 degrees centigrade, the accepted product can be obtained after breaking up and classification. The product obtained by the aforementioned method has no agglomeration, reaches original mean grain size and the moisture content is less than 0.1%. It has the advantages of simple technological process, less equipment invest, low energy consumption, production cost and high economic benefits.

Description

technical field [0001] A drying method for superfine aluminum hydroxide relates to a drying method for water-containing powder materials, in particular to a drying method for industrially producing superfine aluminum hydroxide. Background technique [0002] Ultrafine aluminum hydroxide has the characteristics of flame retardancy, smoke prevention, filling, etc., and has a wide range of applications. However, the temperature of ultrafine aluminum hydroxide filter cakes produced in industry is about 40 ° C, and the solid content is usually above 45% Wt. Because the particles are very fine, The average particle size of the product is 0.5-2μm, and the initial viscosity of the filter cake is as high as 8500mPas, so the particles are easy to agglomerate and agglomerate during drying. In addition, ultra-fine aluminum hydroxide has heat sensitivity problems, and its initial dehydration temperature is less than 180°C, so it brings great difficulty to the drying process of ultra-fine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/44
Inventor 王庆伟王建立马艳红娄东民刘伟
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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