Technology for producing aluminium oxide

A technology of alumina and new technology, applied in the field of alumina production technology, can solve the problems of too many process links, more cement output, less alumina output, etc., to solve environmental pollution problems, strong market adaptability, reduce The effect of production costs

Inactive Publication Date: 2005-06-08
郭长征 +1
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  • Application Information

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Problems solved by technology

Its technical core is "five-stage preheating and decomposition outside the furnace, coal powder calcination, special cooling equipment for rapid cooling, integrated with power plants and boilers, waste heat utilization, and silica slag production of cement". Its disadvantages are large investment and long process. There are too many process links and high cost. When the aluminum-silicon ratio is ≤1, the output of alumina is less, the output of cement is more, and the positions of main and by-products are reversed.

Method used

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  • Technology for producing aluminium oxide
  • Technology for producing aluminium oxide
  • Technology for producing aluminium oxide

Examples

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Embodiment Construction

[0010] 1. Kaolin or fly ash desiliconization production process

[0011] The early desiliconization process is attached figure 1 shown. Crush kaolinite to 60-325 mesh, roast at 900°C-1100°C for 1-4 hours (if fly ash is used, no crushing and roasting is required), use 14-18% NaOH lye, add additive water Glass (the addition amount is 1 / 50-1 / 30 of the volume of the desilication alkali solution) or sodium silicate nonahydrate (the addition amount is 5-7g / 150ml), react at 80°C-95°C for 60-90 minutes, that is Complete desiliconization. Wherein: liquid-solid ratio is 4-7ml / g.

[0012] 2. Alumina production process

[0013] The flow chart of the new process for producing alumina is as follows figure 2 shown. The kaolinite or fly ash that has been desiliconized in advance is mixed with limestone and coal in a certain proportion, crushed to a size of 60-325 mesh, and after being balled, it is fired and roasted in a kiln to form self-crushed clinker powder. The vertical kiln does...

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Abstract

A process for preparing aluminium oxide features that the kaolinite and powdered coal ash are predesiliconized to make the Al-Si ratio is greater than 4, the self-breaking sinter method is used, the diluted solution of sodium carbonate is used for extracting, and the complex reaction is used for purifying. The pure CO2 gas generated by sintering and NaAl2O3 solution take part in carbonizing reaction to generate aluminium hydroxide. Changing the crystalline structure of aluminium hydroxide can obtain aluminium oxide.

Description

Technical field: [0001] The invention belongs to an alumina production process. Background technique: [0002] The traditional method of producing alumina is to use low-silicon and high-alumina bauxite (aluminum-silicon ratio ≥ 4) as raw material to produce it by Bayer method or traditional sintering process. Domestic bauxite reserves are decreasing year by year, the grade is declining, and the production cost is getting higher and higher. The traditional sintering method is to mix and calcine bauxite, limestone, coal and caustic soda together in proportion. The clinker is in the form of a hard block. When leaching, it must be broken first and then leached with water. The disadvantages are that caustic soda is corrosive to equipment, the firing temperature is high, the purity of the leachate is low, the process is complicated, the cost is high, and industrial waste residues pile up like mountains, polluting the environment. [0003] In recent years, there is a new calcinat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30
Inventor 郭长征陈伯清
Owner 郭长征
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