Method for production of alumina, joint product of cement and joint product of 4A zeolite molecular sieve with high aluminum fly ash

A high-aluminum fly ash, zeolite molecular sieve technology, applied in alumina/aluminum hydroxide and other directions, can solve the problems of large material consumption, low added value, and high consumption of raw materials, reduce energy consumption and cost, and reduce waste residue discharge. , The effect of reducing material flow

Inactive Publication Date: 2011-10-26
INNER MONGOLIA DATANG INT RENEWABLE RESOURCES DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this process are: the raw material consumption is high, 5 tons of limestone is required to produce 1 ton of alumina, resulting in high energy consumption; and 8 tons of slag are produced, and the amount of slag is too large; the silicon element in the fly ash is all formed into cement, and there is no High value-added utilization possible
In this method, the aluminum and silicon elements contained in the fly ash have been utilized with high technology, but the disadvantages are: the reaction temperature is too high, the time is long, the energy consumption is high, and industrial grade alumina and sodium silicate are added, res...

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  • Method for production of alumina, joint product of cement and joint product of 4A zeolite molecular sieve with high aluminum fly ash
  • Method for production of alumina, joint product of cement and joint product of 4A zeolite molecular sieve with high aluminum fly ash
  • Method for production of alumina, joint product of cement and joint product of 4A zeolite molecular sieve with high aluminum fly ash

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Embodiment 1

[0052] figure 1 It is the method flowchart of producing alumina, co-production cement and co-production 4A zeolite molecular sieve for embodiment 1 high-alumina fly ash; figure 2 Scanning electron microscope picture of the 4A zeolite molecular sieve prepared in Example 1.

[0053] The method for producing alumina, co-production cement and co-production 4A zeolite molecular sieve with high alumina fly ash in this embodiment comprises the following steps:

[0054] 1) Pre-desiliconization, mix high-alumina fly ash with 15% sodium hydroxide solution at a mass ratio of 0.5:1, pass through a casing heater after mixing and heat to 120°C and import it into a pressure-resistant container Carry out the desiliconization reaction, the reaction time is 2.0h, and then filter to obtain the desiliconization liquid in the liquid phase (used to prepare 4A zeolite molecular sieve after filtering with a leaf filter) and the fly ash filter cake in the solid phase after depressurization from the ...

Embodiment 2

[0067] The method for producing alumina from high alumina fly ash comprises the steps:

[0068] 1) For pre-desilication, mix high-alumina fly ash and 15% sodium hydroxide solution at a mass ratio of 0.5:1, pass it into a casing heater, heat it to 125°C, and import it into a pressure-resistant container Carry out the desiliconization reaction for 1.5 hours, and carry out liquid-solid separation after depressurization from the evaporator to obtain the desiliconization liquid in the liquid phase and the fly ash filter cake in the solid phase, wherein the aluminum-silicon ratio of the original fly ash is 1.12, and after desiliconization raised to 2.08. SiO in desiliconization solution 2 The concentration is 62g / l;

[0069] 2) Preparation of raw slurry: add limestone (quicklime) and sodium carbonate solution to the fly ash filter cake to obtain a mixed slurry, adjust the calcium ratio to 1.96, and the sodium ratio to 1.0, grind the mixed slurry and prepare a raw slurry , the m...

Embodiment 3

[0078] A method for producing alumina co-production cement with high-alumina fly ash, wherein the steps for producing alumina with high-alumina fly ash are the same as in Example 2.

[0079] The method for aluminum co-production cement comprises: a section of dissolution coarse slag in embodiment 2 step 4) and N 2 o k , N 2 o c 、Al 2 o 3 The second-stage adjustment solution with a concentration of 12g / L, 3g / L, and 13g / L was mixed in a rod mill and reacted while grinding to carry out the second-stage dissolution. The dissolution time was 10min and the dissolution temperature was 78°C. The second-stage dissolution slurry is introduced into the settling tank, diluted with water, and subjected to sedimentation and separation. The bottom flow is the second-stage dissolution residue. The average particle size of the second-stage dissolution residue is between 40 and 70 μm, and the maximum particle size does not exceed 200 μm. The second-stage eluate of the overflow phase ...

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Abstract

The invention provides a method for production of alumina, a joint product of cement and a joint product of 4A zeolite molecular sieve with high aluminum fly ash. The production of alumina with high aluminum fly ash comprises the steps of: pre-desilication, raw slurry preparation, clinker calcination, clinker leaching, first and second stage deep desilication, carbon dioxide decomposition, seed precipitation, aluminum hydroxide calcination, thus obtaining alumina. Part of the sodium aluminate crude liquor generated from pre-desilication can be used to synthesize a 4A zeolite molecular sieve with desilication liquor, and residues from clinker leaching can be used for cement production after desilication. Characterized by simple process, low energy consumption, low cost and high utilization rate of raw material, the method of the invention is suitable for industrial application.

Description

technical field [0001] The invention relates to fly ash resource utilization technology, in particular to a method for co-producing alumina, cement and 4A zeolite molecular sieve from high-alumina fly ash. Background technique [0002] With the increasing shortage of bauxite resources in our country, the extraction of alumina from other aluminum-containing resources including high-alumina fly ash has attracted more and more attention. Moreover, there are a large number of high-alumina fly ash resources in my country. For example, due to the special geological background, the Late Paleozoic coal seams and gangue in the Ordos Basin are rich in minerals such as boehmite and kaolinite. The alumina content is as high as about 50%, which is equivalent to that of medium-grade bauxite, and 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 Inner Mongolia are as high as...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 陈刚孙俊民张战军孙振斌王家发张晓云张先奇张国希徐鹏
Owner INNER MONGOLIA DATANG INT RENEWABLE RESOURCES DEV
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