Two-stage grinding-classifying process for preparing alumina pulp

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...

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