Anshan style lean hematite swirler-lattice type ball mill primary closed-circuit grinding grading technique

Abstract

The invention relates to a classifying technique of Anshan-typed poor hematite of first-level closed path ore grinding with a cyclone grate ball mill, which is characterized in that the closed path ore grinding with the cyclone grate ball mill that consists of the cyclone grate ball mill smashes the poor hematite into the granularity of 0 to 12 mm, feeds the particles into a grate ball mill for ore grinding, and controls the feeding rate of a grinder, the ore grinding density, the return-to-sand water and the ball drainage, the ground ore slurry automatically flows into a spin-feeding pump pool, gets classified by a hydraulic cyclone, and then completely returns to the ball mill for grinding, and the return-to-sand rate is controlled at 200 to 300 percent. The products with the cyclone overflow density of 45 to 50 percent and the cyclone overflow granularity of 55 to 60 percent are qualified products in the ore grinding and classifying job and can be fed into the selecting job for selection. The classifying technique of the Anshan-typed poor hematite realizes stable closed path ore grinding and classifying job and has the ore grinding processing capacity of over 5 percent in unit time, the systematic job rate is raised by 2.8 percent, the 360-screenmesh content in the granulometric composition of the classified products is reduced by 8.6 percent, and the classifying technique of the Anshan-typed poor hematite reduces argillization and is more favorable for the selecting job in next processure.

Description

technical field [0001] The invention relates to a closed-circuit grinding and grading process in preparation for beneficiation, which is aimed at the grinding and grading process of lean hematite ore under the condition of a cyclone-lattice ball mill system configuration, and particularly relates to an Anshan-type lean hematite Ore cyclone-lattice ball mill one-stage closed-circuit grinding and classification process. Background technique [0002] At present, in the beneficiation of lean hematite ore, grinding and grading operations are required. [0003] In the prior art, a closed-circuit grinding and grading operation usually uses a spiral classifier as an inspection and grading device to form a closed-circuit grinding and grading system with a grid-type ball mill. The advantage is that the process is relatively mature and the management is convenient; Frequent replacement, the large shaft of the classification is easy to break, the failure rate is high, and there is no e...

AI Technical Summary

Problems solved by technology

In order to improve the processing capacity of the grinding and classifying operation, the mill operating rate and the classification efficiency, the cyclone is combined with the grid-type ball mill to eliminate the above disadvantages, but the grid-type ball mill has a coarse grinding particle size and is easy to block the cyclone

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