Two-stage grinding-classifying process for preparing alumina pulp

A kind of technology of alumina and pulp, which is applied in the direction of alumina/hydroxide, grain processing, etc., can solve the problems that the capacity of the mill is not fully utilized, the classification efficiency of the spiral classifier is low, and the power consumption of the grinding is increased. The effect of reducing over-grinding, reducing energy consumption, and improving dissolution rate

Inactive Publication Date: 2005-01-26
GUIYANG AL-MG DESIGN & RES INST
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  • Abstract
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AI Technical Summary

Problems solved by technology

The classification efficiency of the spiral classifier is low, and the coarse grinding and fine grinding of the ore are carried out in the same mill, some ores are over-grinded, the capacity of the mill cannot be fully utilized, the production capacity is low, and the power consumption of the grinding is increased.
The spiral classifier is a heavy-duty operating equipment, with broken shafts and crushing phenomena, and many faults

Method used

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Examples

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Effect test

Embodiment Construction

[0006] Embodiment of the present invention: add bauxite (agglomeration is less than 25mm), lime (agglomeration is less than 50mm) into the rod mill in the ratio of 100:8 for rough grinding, and add appropriate amount of lye, control the temperature at 80- 90°C, to ensure that the best liquid-solid ratio in the mill is 0.4-0.8, and the coarse ore pulp (fineness 100%<3000μ, 80%<650-1000μ, 25-30%<63μ) enters the pump pool. The graded underflow (coarse sand) after being classified by the hydrocyclone will all enter the ball mill for fine grinding (the amount of solids at this time is 2.5 to 3.5 times the amount of ore added to the rod mill). ℃) to adjust the optimum liquid-solid ratio in the mill to 0.4-0.8, and the discharged ore pulp also enters the same pump pool, and lye is added (temperature 80-90 ℃), so that the solid content of the mixed ore pulp is 470-520g / L. The speed-regulating mud pump sends the mixed slurry in the pump pool to the hydrocyclone for classification (main...

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Abstract

The invention discloses a two-segment mineral grinding-classification process, it grinds the bauxite and lime in the rod mill, the grinded raw mine pulp is poured into a pump pool. The classified bottom flow after classified by water swirler is grinded in ball grinder, adjusts the best liquid and solid rate with proper alkali liquid, the discharged mine pulp is poured into the same pump pool, and adds in alkali liquid to maintain the solid content at 470-520g/L, and carries on classification to the compound mine pulp in the water swirler, the bottom flow enters the ball grinder to be grinded.

Description

Technical field: [0001] The invention relates to a process for preparing alumina pulp. technical background: [0002] in Al 2 o 3 In the production process, bauxite pulp is generally prepared by ball mill grinding, spiral classifier classification, and ball mill grinding and hydrocyclone classification in some cases. The fineness of the finished pulp is not uniform, and Relatively thick (-63μ content is only 55-60%), sent to high-pressure dissolution, Al 2 o 3 The dissolution rate only reaches about 87%. During the grading process, the grading efficiency of the spiral classifier is only 50-60%, resulting in 40-50% of qualified products not being classified, resulting in re-grinding, low output, and increased energy consumption. In the five major alumina plants that have been built in my country, pulp preparation is a weak link in the production process. The grinding and grading process of one-stage mill-screw classifier is generally adopted. Although these ores are rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C17/00B02C23/08C01F7/02
Inventor 王其超王树超张明渊
Owner GUIYANG AL-MG DESIGN & RES INST
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