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Method for preparing seed crystal by utilizing phosphoric acid and producing superfine aluminum hydroxide

A technology of ultra-fine aluminum hydroxide and aluminum hydroxide, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of high production cost of ultra-fine aluminum hydroxide and achieve supersaturation. The effect of low degree, simple process and long induction period

Active Publication Date: 2017-05-31
SHANDONG LUBEI ENTERPRISE GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the high purity of ultra-fine aluminum hydroxide, the current production mainly uses expensive sintering sodium aluminate semen, so that the production cost of ultra-fine aluminum hydroxide remains high

Method used

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  • Method for preparing seed crystal by utilizing phosphoric acid and producing superfine aluminum hydroxide
  • Method for preparing seed crystal by utilizing phosphoric acid and producing superfine aluminum hydroxide

Examples

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Comparison scheme
Effect test

specific Embodiment approach

[0025] Below by embodiment the present invention is further illustrated.

[0026] Example 1

[0027] Add 180g of Bayer-process aluminum hydroxide to 400ml caustic soda solution with a caustic concentration of 220g / L, and re-dissolve at 105°C, the α of the sodium aluminate solution k is 1.31. Under the condition of 40-45°C constant temperature water bath, add 2mol / L phosphoric acid and redissolved sodium aluminate solution into the seed tank in a homogeneous flow mode, the reaction time is 30min, and the pH of the reaction solution is 8.5-9.5 at the end of the control. 40 Aged at -45°C for 24 hours, separated, washed, and filtered to obtain highly active seed crystals (D50=1.00 μm). With the seed crystal coefficient as 10%, the above-mentioned seeds are added to the sodium aluminate solution after dilution (caustic alkali concentration is 120g / L, α k =1.34), in a 60°C hot water bath, the stirring speed is 360r / min, and the reaction time is controlled at 20h. After the react...

Embodiment 2

[0029] Add 200g of Bayer-process aluminum hydroxide to 500ml caustic soda solution with a caustic concentration of 220g / L, and re-dissolve at 105°C, the α of the sodium aluminate solution k is 1.38. Under the condition of 40-45°C constant temperature water bath, add 2mol / L phosphoric acid and redissolved sodium aluminate solution into the seed tank in a homogeneous flow mode, the reaction time is 45min, and the pH of the reaction solution at the end of the control is 8.5-9.40 Aged at -45°C for 24 hours, separated, washed, and filtered to obtain highly active seed crystals (D50=0.82 μm). With the seed crystal coefficient as 20%, the above-mentioned seed crystals are added to the sodium aluminate solution after dilution (caustic alkali concentration is 130g / L, α k =1.41), in a 60°C hot water bath, the stirring speed is 360r / min, and the reaction time is controlled at 20h. After the reaction is over, the liquid and solid are separated, the filter cake is washed with hot water u...

Embodiment 3

[0031] Add 200g of Bayer-process aluminum hydroxide to 500ml caustic soda solution with a caustic concentration of 220g / L, and re-dissolve at 105°C, the α of the sodium aluminate solution k is 1.44. Under the condition of 40-45°C constant temperature water bath, add 2mol / L phosphoric acid and redissolved sodium aluminate solution into the seed tank in a homogeneous flow mode, the feeding time is 60min, and the pH of the reaction solution at the end of the control is 8.5-9.40 Aged at -45°C for 24 hours, separated, washed, and filtered to obtain highly active seed crystals (D50=0.91 μm). Be that 30% with seed crystal coefficient add above-mentioned seed crystal to the sodium aluminate solution after dilution (caustic alkali concentration is 110g / L, α k =1.5), in a hot water bath at 60°C, the stirring speed is 360r / min, and the reaction time is controlled at 20h. After the reaction was completed, the liquid and solid were separated, and the filter cake was washed with hot water...

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Abstract

The invention discloses a method for preparing a seed crystal by utilizing phosphoric acid and producing superfine aluminum hydroxide. A semi-product, namely aluminum hydroxide, in a Bayer-process aluminum oxide process is used as a raw material to carry out alkali digestion; the seed crystal is prepared by utilizing the phosphoric acid, and a superfine aluminum hydroxide flame retardant product is produced. According to the method disclosed by the invention, the granularity of the product is uniform, the product is not agglomerated and a dispersant is not needed.

Description

technical field [0001] The invention relates to the technical field of aluminum hydroxide production, in particular to a method for producing superfine aluminum hydroxide by using phosphoric acid as seed crystals. Background technique [0002] Due to the good thermal stability of ultra-fine aluminum hydroxide and no secondary pollution during combustion, it is a green flame retardant product. In recent years, the demand for flame retardant ultra-fine aluminum hydroxide has increased sharply at home and abroad, and the research and development cost is low. The ultra-fine aluminum hydroxide flame retardant has broad market application prospects and economic benefits. At present, the preparation of ultra-fine aluminum hydroxide mainly includes mechanical pulverization and chemical methods. In order to reverse the aggregation of ultra-fine aluminum hydroxide, dispersant is often added to the ultra-fine aluminum hydroxide before drying to prevent powder agglomeration and serious ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
CPCC01F7/14C01P2004/51C01P2006/65
Inventor 吕天宝武文焕冯怡利王军堂刘尧
Owner SHANDONG LUBEI ENTERPRISE GROUP
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