Example 3: Takara iron ore processing plant from recycled fine screening mill flow (FIG. 8).
In 1978, the plant used the original factory building and part of the idle equipment to change the second section of grinding, one section of magnetic dehydration and three sections of magnetic separation on the basis of the original one-stage grinding, one-stage magnetic separation and two-stage magnetic dehydration beneficiation process. , Sec fine screen selection process, the three types of ore: oxide ore, mixed mineral, primary ore (based banded magnetite quartzite, quartz rock green clay magnet) for process tests showed a grade iron ore In the first half of 1979, 62.23% increased to 66.05%, the highest was 68.27%, and the silica content decreased from 12.93 to 15.35% to 6.56 to 3.91%. The processing capacity of the ball mill is increased from the original 45t/(tai · h) to about 80t/(tai · h). [next]
Example 4: Fine screen self-circulating regrind process at Malantzhuang Concentrator (Figure 9).

The type of ore in the Malanzhuang iron ore is Anshan-type magnetite quartzite. The main metal minerals magnetite and hematite small amount. The main gangue minerals are quartz, feldspar , pyroxene and the like. The ore structure is mainly strips and sheets. The ore hardness is 8-12, and the density is 3.1-3.5. The mine treats 200,000 tons of iron ore annually. The original design processing capacity is 150,000 t/a, the original ore grade is 25%, the recovery rate is 80%, and the concentrate grade is 60%. Since 1972, although several technical changes have been made, the indicators have not changed much, and the original design level has been basically maintained. At the end of October 1977, after the new fine-screen re-grinding process was put into production, the indicators reached a new level, the concentrate grade reached 66-67%, and the recovery rate was 83-84%. [next]
Example 5: Fine Screen Regrind Process at the Carroll Concentrator in Canada (Figure 10).

This is a fine screen regrind process that focuses on re-election of tailings. A hydrocyclone was placed in the second-stage grinding, and the overflow was first magnetically selected and then sieved.
Example 6: Fine Screen Regrind Process at Liberia Bunge Concentrator (Figure 11)

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