Dry-process firing method of bauxite with low aluminum-silicon ratio

A bauxite, aluminum-silicon ratio technology, applied in the field of bauxite dry sintering, can solve the problems of poor product quality, increased infrastructure investment, difficult control, etc., to reduce equipment and personnel investment, reduce energy consumption, reduce The effect of operational difficulty

Active Publication Date: 2016-07-27
开曼铝业(三门峡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although over the years, some scientific research institutes and enterprises in our country have developed technologies such as parallel method and mixed method to utilize bauxite and improve the recovery rate of alumina and sodium oxide, but these two methods need to use the traditiona

Method used

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  • Dry-process firing method of bauxite with low aluminum-silicon ratio
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  • Dry-process firing method of bauxite with low aluminum-silicon ratio

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Example Embodiment

[0031] Example 1:

[0032] The present invention will be described below through different embodiments. The present invention is not limited to these embodiments, and can be adjusted and implemented within the scope of the aforementioned chemical composition and manufacturing method.

[0033] The raw materials of bauxite and limestone are mines in Xiaoyi District, Shanxi, whose compositions are shown in Tables 1 and 2.

[0034] Table 1: Composition of bauxite

[0035]

[0036] Table 2: Limestone composition

[0037]

[0038] See the operation process figure 1 . First crush the bauxite (composition as shown in Table 1) and limestone (composition as shown in Table 2) to 2-5mm respectively, and then grind them to a particle size of -0.074mm or more than 85%. Then bauxite powder, limestone powder, soda ash powder and lye (the circulating mother liquor after the second step of evaporation, the concentration of Na 2 O500g / L, αk=14) Proportionally, 35 parts by mass of bauxite, 28 parts by ...

Example Embodiment

[0049] Example 2

[0050] Table 3: Composition of bauxite

[0051]

[0052] First, crush bauxite (composition as shown in Table 3) and limestone (composition as in Example 1) to 2-5mm respectively, and then grind them to a particle size of -0.074mm, accounting for more than 85%. Then bauxite powder, limestone powder, soda ash powder and lye are fully mixed in proportion to 40 parts by mass of bauxite, 30 parts by mass of limestone and 10 parts by mass of soda ash, and the concentration of lye is Na 2 O600g / L, αk=25. After mixing, the alkali ratio is 1, the calcium ratio is 2, A / S is 4.5, and the moisture content is 16%.

[0053] The prepared materials are put into a powerful mixer for full mixing, and the mixing uniformity is 98%.

[0054] The mixed material is put into a dryer for drying. The flue gas for drying is the flue gas of the sintering kiln. The temperature is 1000~1100℃. The dried material enters the rotary kiln for sintering. The sintering temperature is controlled at 115...

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Abstract

The invention provides a dry-process firing method of bauxite with low aluminum-silicon ratio. The method comprises the following steps: dosing and mixing the limestone powder, bauxite powder, sodium carbonate and evaporation-return recycled alkaline solution; sintering in a rotary kiln; cooling the sintered clinker and levigating; adding adjustment liquid into the clinker powder for dissolving out; performing reverse sufficient washing of the slag dissolved out of the clinker powder for 5-7 times, wherein the washing liquid is used as adjustment liquid while the slag is piled; mixing the solution dissolved out of the clinker powder with sodium aluminate crystal for dissolution, and desiliconizing; performing seed decomposition; and performing evaporation and salt elimination of the seed mother liquor by two steps. In the method provided by the invention, for the bauxite with low aluminum-silicon ratio, the sintering raw material is combined with appropriate limestone and sodium carbonate so that the sintered clinker powder can be effectively leached; the dry-process firing conditions are controlled so that the technological process of the sintering process is shortened by over one third, the seed composition rate is improved by 90% or over, and the total recovery rate of aluminum oxide is 90% or over.

Description

technical field [0001] The invention belongs to the field of preparing alumina from aluminum-containing ore, and in particular relates to a dry firing method for bauxite. Background technique [0002] The aluminum industry is the basic industry of our country, and the demand for bauxite in economic construction is very large, and most of our country is medium and low-grade bauxite. At present, more than 99% of my country's alumina production is produced by the Bayer process. With the declining trend of bauxite supply grade, the amount of alumina and sodium oxide abandoned in the red mud of the Bayer process is also increasing, resulting in Great waste of resources. On the other hand, because the quality of domestic bauxite is getting worse and higher, the price is getting higher and higher, and the cost of the Bayer process is also rising. In recent years, some enterprises have to import a large amount of bauxite from abroad. The foreign dependence of my country's bauxite al...

Claims

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Application Information

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IPC IPC(8): C01F7/08C01F7/44
CPCC01F7/08C01F7/441
Inventor 张广麻树春
Owner 开曼铝业(三门峡)有限公司
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