Novel method for processing calx sodica sintered alumina by dry method

A technology of sintering alumina and processing methods, which is applied in the field of metallurgy, can solve the problems of low heat production efficiency and large heat consumption, and achieve the effects of reducing heat loss and high economic benefits

Inactive Publication Date: 2009-05-20
CHONGQING BOSAI MINERALS GROUP
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  • Claims
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AI Technical Summary

Problems solved by technology

The main disadvantage of clinker kiln as reaction equipment is low heat production efficiency. The calculation of heat consumption is shown in Table 1. The theoretical heat consumption of clinker sintering (that is, the sum of firing reaction heat and water evaporation heat consumption) is 4.62×10 6 kJ/t, so the heat utilization efficiency is only about 50%. In addi

Method used

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Embodiment Construction

[0025] 1. Raw slurry preparation

[0026] The requirements of our factory ingredients for various raw materials

[0027] 1. Bauxite: particle size <20mm, moisture content less than 7%

[0028] 2. Lime: particle size 75%.

[0029] 3. Soda ash: containing Na2≮58.5%, moisture <2.0%.

[0030] 4. Anthracite: containing Car>50%, Var<25%, Aar<25%, moisture less than 1%

[0031] 5. Drying Bayer process red mud: containing Na20T<10g / 1, containing H20<2%.

[0032] Bauxite, lime, soda ash, anthracite, and carbon are divided into mother liquor in proportion, Ca / (Si+Ti)=2, Na / Al=1, Fe / Al=0.1, the above is the ratio of molecular weight, and coal is 5% , sent to the raw material mill to be ground into raw meal powder, requiring a fineness of 100# and 5% of the sieve.

[0033] 2. Calculation of ingredients

[0034] Al20 Si02 Fe203 Na20 CaO Na2C03 Na2S04 C S Ti02 Ash Bauxite 0.6329 0.0819 0.1162 0.0039 red mud 0.246 0.1552 0.121...

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Abstract

The invention discloses a processing method for sintering alumina by a novel dry soap lime, which comprises the following steps: (1) raw materials, i.e., broken bauxite, limestone, sodium carbonate and coal are sent to a ball mill to be milled until the oversize product of 100<#> is not lager than 5 percent, and raw meal is made into raw meal balls of 30-50mm; (2) clinker sintering: the raw meal of the step (1) is calcined in a vertical kiln at the temperature of 1150-1250 DEG C to prepare the clinker; (3) clinker leaching: the clinker is leached by the lotion of Bayer process, and then the solution is sent to a desilication groove; (4) decomposition: the desiliconized solution is combined with a Bayer solution, and then the mixture is put into a leaf filter and enters a decomposer to be decomposed by adding seed crystal; and (5) roasting: aluminum hydroxide is roasted into alumina at 950-1200 DEG C. The processing method has the beneficial effect that the water content of the raw meal is reduced to 10-15 percent, thus greatly reducing the specific heat consumption in the sintering process by little change and acquiring higher economic benefits.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a novel dry-process soda lime sintered alumina processing method. Background technique [0002] So far, alumina production methods are roughly divided into alkaline method, acid method, acid-base combined method and thermal method. However, only the alkaline method has been applied in industry. Among them, there are Bayer method, soda lime sintering method and so on. The advantage of the Bayer method is that the process is simple, but the disadvantage is that it is not suitable for processing low-grade bauxite. The advantage of soda lime sintering method is that it is suitable for processing low-grade ore, but the disadvantage is high energy consumption. The comprehensive energy consumption per unit product of the soda lime sintering method is about 36GJ / tAO, and the comprehensive energy consumption per unit product of the Bayer process is about 13GJ / tAO. [0003] In soda-lime sinte...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 王显永
Owner CHONGQING BOSAI MINERALS GROUP
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