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Method utilizing high-alumina fly ash to produce aluminum oxide

A high-alumina fly ash and alumina technology, applied in the direction of alumina/aluminum hydroxide, alkaline earth metal silicate, silicate, etc., can solve the problem of large slag phase flow rate, high sintering energy consumption, long process flow, etc. problems, achieve high alumina yield, reduce high energy consumption, and simplify operation methods

Active Publication Date: 2016-07-13
DATANG INT HIGH ALUMINA COAL R & D CENT
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Problems solved by technology

[0003] In recent years, various colleges and scientific research units in my country have actively carried out research on the new process of extracting alumina from high-alumina fly ash. The main processes can be divided into: pre-desilication-soda lime sintering method, acid method, ammonium sulfate sintering method The representative methods are soda lime sintering method and limestone sintering method. The limestone sintering method has the disadvantages of large slag phase flow rate and high energy consumption; the pre-desilication-soda lime sintering method is currently the only industrialized production method. However, this process has the problems of long process flow and high sintering energy consumption

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  • Method utilizing high-alumina fly ash to produce aluminum oxide

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Embodiment 1

[0029] In this embodiment, high-alumina fly ash from a thermal power plant in Inner Mongolia is used as raw material, and the specific chemical composition analysis results are shown in Table 1:

[0030] Table 1

[0031] Element

SiO 2

al 2 o 3

CaO

TiO 2

Fe 2 o 3

Loss on ignition

total

Content / %

40.25

49.85

3.98

0.98

1.88

1.87

98.81

[0032] This embodiment adopts as figure 1 The shown technological process prepares alumina, and concrete steps are:

[0033] step 1)

[0034]Heat the mixed solution composed of high-alumina fly ash and 20% sodium hydroxide solution (the mass ratio of high-alumina fly ash to sodium hydroxide is 1:0.5) to 120°C, then import it into a pressure-resistant container for The desiliconization reaction is carried out for 1.5 hours, and then the liquid-solid separation and washing are carried out to obtain the desilication lye in the liquid phase and the desilicon...

Embodiment 2

[0049] This embodiment adopts as figure 1 The shown technological process prepares alumina, and the high-aluminum fly ash raw material that adopts is identical with embodiment 1, and specific steps are:

[0050] step 1)

[0051] Heat the mixed solution composed of high-alumina fly ash and 15% sodium hydroxide solution (the mass ratio of high-alumina fly ash to sodium hydroxide is 1:0.4) to 110°C, then import it into a pressure-resistant container for The desiliconization reaction is carried out for 2.5 hours, and then the liquid-solid separation and washing are carried out to obtain the desilication lye in the liquid phase and the desiliconization fly ash filter cake in the solid phase. After testing, the solid-phase aluminum-silicon ratio of the desiliconized fly ash filter cake reached 2.10, the concentration of silicon dioxide in the desilication lye was 48.97g / L, the concentration of sodium oxide was 58.76g / L, and the concentration of alumina was 1.98g / L , sodium carbona...

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Abstract

The invention provides a method utilizing high-alumina fly ash to produce aluminum oxide.The method comprises the steps that the high-alumina fly ash is subjected to pre-desiliconization treatment to obtain desiliconized fly ash and a desiliconized alkali liquor; Bayer-process dissolution is performed after the desiliconized fly ash and a seed precipitation mother liquor are mixed to obtain Bayer-process dissolved residues and Bayer-process dissolved slurry; the Bayer-process dissolved residues and limestone are grinded and mixed to obtain a mixed material, then the mixed material is sintered into a clinker, the clinker is dissolved by using a dissolution adjustment solution, and then a sintering-process dissolution solution is obtained; the Bayer-process dissolved slurry and the sintering-process dissolution solution are mixed, ordinary-pressure desiliconization treatment is performed to obtain a refined sodium aluminate solution; the refined sodium aluminate solution is subjected to seed precipitation and calcination to obtain the aluminum oxide.The method utilizing the high-alumina fly ash to produce the aluminum oxide optimizes a technological process while maintaining higher aluminum oxide extraction rate and reduces the energy consumption and production cost.

Description

technical field [0001] The invention relates to a method for producing alumina by using high-alumina fly ash, which belongs to the technical field of resource regeneration. Background technique [0002] The main chemical components of high-alumina fly ash are alumina and silica, which is a kind of solid waste produced after coal combustion in thermal power plants. If it is not utilized, it will cause long-term and huge damage to human health and the environment. With the increasing shortage of bauxite resources in our country, the use of fly ash, coal gangue and other industrial solid wastes to extract alumina has attracted more and more attention. Due to the special geological background, the Late Paleozoic coal seams and gangue in the Ordos Basin are rich in boehmite and kaolinite and other minerals, and the alumina content in the fly ash produced after combustion is as high as 50%, which is comparable to that of medium-grade bauxite. The alumina content in the ore is equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01B33/24
CPCC01B33/24C01F7/02
Inventor 孙俊民洪景南高志军杨会宾朱应宝闫禄军胡剑陈雄兵许学斌
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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