Method for producing aluminum oxide and co-producing active calcium silicate through high-alumina fly ash

A high-alumina fly ash and activated calcium silicate technology, applied in chemical instruments and methods, alumina/hydroxide preparation, silicate, etc., can solve problems such as difficult technology control, small market share, complex equipment, etc. , to achieve the effects of increasing economic and social value, reducing the amount of slag, and uniform particle size distribution

Active Publication Date: 2011-11-23
INNER MONGOLIA DATANG INT RENEWABLE RESOURCES DEV
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Problems solved by technology

Although these patents have considered the phase characteristics of fly ash and adopted the idea of ​​extracting silicon first and then aluminum to reduce energy consumption and improve element utilization, the white carbon black produced after silicon extraction currently has a small m

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  • Method for producing aluminum oxide and co-producing active calcium silicate through high-alumina fly ash
  • Method for producing aluminum oxide and co-producing active calcium silicate through high-alumina fly ash
  • Method for producing aluminum oxide and co-producing active calcium silicate through high-alumina fly ash

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Embodiment 1

[0037] figure 1 The production process flowchart that provides for the embodiment of the present invention one, as figure 1 It can be seen that the method for producing alumina and co-producing active calcium silicate with high-alumina fly ash provided in this embodiment comprises the following steps:

[0038] 1), pre-desilication, after heating the mixed solution composed of high-alumina fly ash and 20% sodium hydroxide solution (the mass ratio of sodium hydroxide to high-alumina fly ash is 0.5:1) to 110°C , introduced into a pressure-resistant container for desiliconization reaction for 2 hours, and then liquid-solid separation to obtain liquid-phase desiliconization liquid and solid-phase fly ash filter cake. The ratio of aluminum to silicon in the fly ash filter cake is higher than that before the desilication reaction High aluminum fly ash; the mass content of alumina in high aluminum fly ash is higher than 40%;

[0039] 2), the preparation of active calcium silicate, c...

Embodiment 2

[0046] figure 2 The production process flowchart that provides for the embodiment of the present invention two, as figure 2 As shown, the method for producing alumina and co-producing active calcium silicate with high alumina fly ash provided in this embodiment comprises the following steps:

[0047] 1), pre-desiliconization, the mixed solution (the mass ratio of sodium hydroxide solution and high aluminum fly ash is 0.6:1) of high alumina fly ash and 10% sodium hydroxide solution is heated to 130 °C Afterwards, it is introduced into the insulation retention tank for desiliconization reaction for 2.5 hours, and then liquid-solid separation is carried out after depressurization from the evaporator to obtain the desiliconization liquid of the liquid phase and the desiliconization fly ash filter cake of the solid phase, wherein the former fly ash The aluminum-silicon ratio is 1.15, which rises to 2.12 after desiliconization, and SiO in the desilication solution 2 The concentr...

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Abstract

The invention provides a method for producing aluminum oxide and co-producing active calcium silicate through high-alumina fly ash. The method comprises the following steps that: the high-alumina fly ash firstly reacts with a sodium hydroxide solution to carry out pre-desilication to obtain a liquid-phase desiliconized solution and a solid-phase desiliconized fly ash; lime cream is added to the liquid-phase desiliconized solution to carry out a causticization reaction, the resulting solid phase is active calcium silicate which is prepared through carrying out filter pressing, flash evaporation and drying to obtain the finished product; limestone and a sodium carbonate solution are added to the desiliconized fly ash to blend qualified raw slurry, then the blend qualified raw slurry is subjected to baking into the clinker, the liquid phase generated from dissolution of the clinker is a crude solution of sodium aluminate; the crude solution of the sodium aluminate is subjected to processes of first-stage deep desilication, second-stage deep desilication, carbonation, seed precipitation, baking and the like to obtain the metallurgical grade aluminum oxide meeting requirements. According to the present invention, the defects in the prior art are overcome; purposes of less material flow and small amount of slaggling are achieved; energy consumption, material consumption and production cost are relative low; extraction rate of the aluminum oxide is high; the calcium silicate with high added value is co-produced; the method provided by the present invention can be widely applicable for the field of chemical engineering.

Description

technical field [0001] The invention relates to high-tech resource utilization of fly ash, in particular to a method for producing alumina and co-producing active calcium silicate from high-alumina fly ash. Background technique [0002] With the increasing shortage of bauxite resources, the use of fly ash, coal gangue and other industrial solid wastes to extract alumina has attracted more and more attention. The extraction of alumina from high-alumina fly ash and other aluminum-containing resources has attracted more and more attention. For example, 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 the same as that in medium-grade bauxite. Rather, it is a very valuable raw material for alumina production. According to statistics, the potential reserves of high-aluminum fly ash in the central and western regions of Inn...

Claims

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Application Information

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IPC IPC(8): C01B33/24C01F7/0693C01F7/085C01F7/30
CPCC01F7/085C01B33/24C01F7/0693C01F7/30
Inventor 孙俊民张战军陈刚闫绍勇霍奇志武利成许宏立秦立安陈晓霞
Owner INNER MONGOLIA DATANG INT RENEWABLE RESOURCES DEV
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