Production method for clinker used in alumina sintering method

Abstract

The invention relates to a production method for a clinker used in an alumina sintering method, and relates to the improvement on a sintering method by using Bayer process red mud to blend. The production method is characterized in that the production process comprises the following steps: (1) dehydrating Bayer process red mud to obtain dehydrated filter cake slurry; (2) performing dry grinding on limestone or lime, ore and anthracite coal to obtain a fine power material, and drying the fine power material; (3) uniformly mixing the red mud filter cake slurry, the fine power material obtained through dry grinding, and soda to obtain a raw material; (4) making the prepared raw material into raw material balls, drying and preheating; (5) adding the dried and preheated raw material balls into a rotary kiln to be sintered to produce the clinker. Through adoption of the production method, the number of used large-scale equipment in a wet method blending process can be greatly reduced, the qualification rate of ingredients of the raw material is increased, the heat utilization in the sintering process is improved, flue gas waste heat is fully utilized, physical and chemical quality and the like of the clinker are improved, the consumption of burning coal in the kiln is reduced by about 20% or above, and the productivity of the kiln can be increased by about 20% or above.

Description

technical field [0001] The invention discloses a clinker production method of sintered alumina, which relates to an improvement of a sintering method using Bayer process red mud for batching. Background technique [0002] At present, the batching and sintering of metallurgical grade alumina sintering method adopts wet batching and wet sintering methods. Raw materials generally include: ore and / or Bayer alkali red mud, alkali solution, lime or limestone, anthracite, soda ash, etc. During the production process, the raw material and alkali solution are ground in a wet mill to prepare a certain component of flowable The raw slurry is desintered. The raw material slurry is sprayed into the sintering equipment (mainly the rotary kiln) by pump equipment and pipelines, and is dried, preheated, sintered and cooled at high temperature to produce solid clinker. [0003] The main problems of the above-mentioned production method are: ①Due to the high water content in the raw slurry, ...

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Problems solved by technology

[0003] The main problems of the above-mentioned production method are: ①Due to the high water content in the raw slurry, it must be dried and dehydrated before sintering to preheat and sinter. In this way, the rotary kiln equipment must be lengthened, which increases equipment investment and land occupation, and the equipment capacity is relatively low. Low

②The water content in the raw slurry is high, and this part of water must be removed by adding fuel (coal, various gas). Therefore, the energy consumption of the sintering process is relatively high

③The moisture and composition of the raw slurry fluctuate greatly, which has a great impact on the heat balance of the rotary kiln. The quality of the clinker is not easy to control, and the clinker is easy to be over-burned or under-burned, which affects the dissolution rate of the subsequent process.

④During the sintering process, the dust content is large, and the moisture content of the flue gas is high. The dust at the dust collection outlet cannot guarantee the emission up to the standard, and the heat utilization rate of the flue gas is low.

The dust content of the flue gas discharge outlet cannot reach 50mg / Nm 3 Standards, all flue gas at around 200°C is discharged, and the heat energy of low-temperature flue gas is difficult to recycle

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