Novel bauxite comminuting process adopting vertical mill

A bauxite and vertical mill technology, applied in grain processing and other directions, can solve the problems of long grinding process, low solid content of qualified slurry, increased equipment investment and land occupation, etc., to simplify the grinding process, The feeding particle size is large, and the effect of improving the solid content

Inactive Publication Date: 2017-01-11
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 1. The crushing and grinding process is long, with many equipments and high investment
[0007] 2. The low solid content of the qualified slurry results in an increase in the volume of the slurry, which requires a larger volume of the pre-desilication tank and more pre-desilication tanks, which increases equipment investment and land occupation

Method used

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  • Novel bauxite comminuting process adopting vertical mill

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited by the embodiments.

[0023] Such as figure 1 As shown, a large piece of bauxite 1 passes through the secondary crusher 2 to crush the ore to a qualified particle size of 40-100 mm, and the bauxite 3 with a qualified particle size after secondary crushing is fed into the vertical mill 4 . The bauxite entering the vertical mill 4 is ground under the action of the huge grinding pressure between the grinding disc and the grinding roller, and the bauxite 3 is crushed after intermediate crushing. Then, under the action of high-speed hot air from the bottom of the nozzle ring pipe at the bottom of the vertical mill 4 (hot air speed 10-50Nm) 3 / s, hot air temperature 100-300°C), the fine particles of bauxite are blown up and passed through the classifier for classification. After being classified by the classifi...

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Abstract

The invention relates to a novel bauxite comminuting process adopting a vertical mill and belongs to the technical field of alumina production. The vertical mill is adopted as comminuting equipment, intermediately-comminuted bauxite directly enters the vertical mill, and comminuted bauxite dry powder and lye are fully mixed to serve as final qualified ore pulp. According to the novel bauxite comminuting process adopting the vertical mill, the vertical mill is adopted as the comminuting equipment, a fine crusher and a ball mill (rod mill) can be replaced, the bauxite comminuting process procedures can be simplified effectively, and the solid content of the qualified ore pulp is increased. Accordingly, the bauxite comminuting process procedures can be simplified effectively, less equipment investment is needed, the solid content of the qualified ore pulp of the raw material grinding work procedures is increased, and the occupied area is reduced.

Description

technical field [0001] The invention relates to a new bauxite crushing process using a vertical mill, belonging to the technical field of alumina production. Background technique [0002] Alumina production mainly uses bauxite as the main raw material. After the bauxite is crushed, the raw material mill is used to grind the bauxite slurry with a qualified particle size by adding appropriate circulating lye, and then undergoes pre-desilication, dissolution, seed decomposition, Processes such as aluminum hydroxide filtration and roasting eventually produce finished alumina. Grinding of raw materials is one of the important processes in alumina production, and the solid content of the pulp after grinding has a very important impact on subsequent processes such as pre-desilication and dissolution. [0003] For a long time, the crushing and grinding process of bauxite mainly adopts the process of two-stage crushing and one-stage closed-circuit grinding. After the bauxite ore mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B02C23/22B02C23/00
Inventor 石建军李志国陈国华
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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