Method for preparing aluminum hydroxide by adopting alumina rock as raw material for cell grinding and water milling of seed crystals

A technology of aluminum hydroxide and aluminous rock, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, chemical instruments and methods, aluminum compounds, etc., can solve the problem of poor quality of aluminum hydroxide and influence of sodium hydroxide The problem of unbalanced addition amount and aluminum hydroxide precipitation rate can narrow the particle size range and improve the quality.

Active Publication Date: 2019-03-01
贵州博汇联润铝业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, during the treatment process, carbon dioxide is used to carbonize sodium aluminate solution to realize the precipitation of aluminum hydroxide, resulting in an unbalanced precipitation rate of aluminum hydroxide, and sodium will be continuously adsorbed on the surface of aluminum hydroxide crystals. Composition, so that there is a large amount of sodium in the aluminum hydroxide crystal, and the sodium content in aluminum hydroxide is one of the key factors that determine the quality of aluminum hydroxide powder. The lower the sodium con

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 100g sample and irradiate it with 500MHz microwave frequency for 1h to get radiation powder;

[0029] The radiation powder and the mixed acid are mixed and stirred according to the mass volume ratio of 1:5, and the leaching treatment is performed for 1 hour, wherein: the moisture content of the radiation powder is 15%, and the mixed acid is a mixed solution of sulfuric acid and nitric acid, and the mixing volume ratio is 1:0.5. The molar concentration of nitric acid is 1mol / L, the mass concentration of sulfuric acid is 50%, and filtered to obtain the leachate;

[0030] The leach solution is adjusted to a pH value of 13 with sodium hydroxide solution to a pH value of 5.0, filtered, and then added with sodium hydroxide to adjust the pH value to 13, filtered to obtain a solution containing sodium aluminate;

[0031] Add the aluminum hydroxide seed crystal slurry to the solution containing sodium aluminate at a mass ratio of 0.005:1, stir for 10 minutes at a stirring s...

Embodiment 2

[0033] Take a 100g sample and irradiate it with 1000MHz microwave frequency for 3h to obtain radiation powder;

[0034] The radiation powder and the mixed acid are mixed and stirred according to the mass volume ratio of 1:5, and the leaching treatment is 1.5h, wherein: the moisture content of the radiation powder is 20%, and the mixed acid is a mixed solution of sulfuric acid and nitric acid, and the mixing volume ratio is 1:0.8. , the molar concentration of nitric acid is 2.1mol / L, the mass concentration of sulfuric acid is 80%, and filtered to obtain the leachate;

[0035] The leach solution is adjusted to a pH value of 13 with sodium hydroxide solution to a pH value of 5.0, filtered, and then added with sodium hydroxide to adjust the pH value to 13, filtered to obtain a solution containing sodium aluminate;

[0036] Add the aluminum hydroxide seed crystal slurry to the solution containing sodium aluminate according to the mass ratio of 0.06:1, stir it with a stirring speed ...

Embodiment 3

[0038] Take a 100g sample and irradiate it with 800MHz microwave frequency for 2h to obtain radiation powder;

[0039] The radiation powder and the mixed acid are mixed and stirred according to the mass volume ratio of 1:5, and the leaching treatment is 1.3h, wherein: the moisture content of the radiation powder is 18%, and the mixed acid is a mixed solution of sulfuric acid and nitric acid, and the mixing volume ratio is 1:0.7. , the molar concentration of nitric acid is 1.7mol / L, and the mass concentration of sulfuric acid is 70%, filtered to obtain leachate;

[0040]Adjust the leaching solution to a pH value of 4.0 with a sodium hydroxide solution with a pH value of 13, and then filter it once; When the sodium hydroxide solution with a pH value of 13 is used to adjust the secondary filtrate to a pH value of 4.8, filter for three times; then the three filtered liquid is adjusted to a pH value of 5.0 using a sodium hydroxide solution with a pH value of 13 , four times of fil...

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Abstract

The invention relates to the technical field of preparation of aluminum hydroxide micro-powder, in particular to a method for preparing aluminum hydroxide by adopting alumina rock as a raw material for cell grinding and water milling of seed crystals. The aluminum rock is activated by crushing, ball milling and microwave radiation. Leaching of aluminum oxide in the aluminum rock by a mixed acid isimproved; after sulfuric acid and nitric acid are mixed into the mixed acid, leaching treatment is performed, so that sulfuric acid leaches aluminum components, sulfate radicals and calcium components form calcium sulfate at the same time, and a process flow of adopting the aluminum rock as the raw material for treatment is shortened. The difficulty of removing calcium ions, magnesium ions, ironions and the like in the later period is lowered, so that the relative content of the aluminum components entering a leachate is relatively high. After sodium hydroxide is adopted for adjusting the pHvalue, cell grinding is conducted to obtain an aluminum hydroxide seed crystal pulp, and then the aluminum hydroxide seed crystal pulp is added into a solution containing sodium aluminate, then crystallized, decomposed and washed to obtain aluminum hydroxide micro-powder with the sodium content lower than 0.1% and the particle size of 0.5-8 microns.

Description

technical field [0001] The invention relates to the technical field of aluminum hydroxide micropowder preparation, in particular to a method for preparing aluminum hydroxide by using aluminum rock as a raw material for cell milling and water milling seeds. Background technique [0002] Aluminous rocks are hydroxides containing aluminum. In my country, aluminous rocks mainly contain diaspore and clay minerals, and also contain siliceous and anatase. With the increasing scarcity of resources and the strengthening of people's awareness of environmental protection, the comprehensive utilization of alumina rock has attracted more and more attention. Aluminous rocks contain high amounts of Al 2 o 3 , Aluminum hydroxide powder can be obtained after leaching with alumina rock and mixed acid to remove impurities, and the obtained aluminum hydroxide powder can be widely used in various flame retardants and inorganic fillers. [0003] For this reason, some researchers in the prior a...

Claims

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Application Information

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IPC IPC(8): C01F7/06C01F7/14
CPCC01F7/06C01F7/0613C01F7/14C01P2004/61C01P2004/62C01P2006/80
Inventor 刘俊良刘安荣刘荣心刘权王振杰姚亮
Owner 贵州博汇联润铝业有限公司
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