In the first grinding and classification stage, ball mill and hydrocyclone consists the closed circuit. It guarantees the classification efficiency and classification particle size. At the same time, it separates part of regular concentrates at advance. Part of low-grade tailings are discarded by high-gradient magnetic separator. It can reduce the middling regrinding amount and metal loss, also avoiding overgrinding.
The magnetic separation can separate regular coarse concentrates and tailings in time, which fits the principle of early recovery and early discarding as possible. It also reduces the flotation workload and costs.
Strong magnetic separation can recover the fine particle iron ore. It has double effects of desliming and discarding tailings. It can provide good conditions for flotation operation.
Verse flotation has a simple reagent system, which can obviously reduce the flotation reagent into the slurry. It can reduce the adverse reactions of flotation.
Hematite separation process is suitable for complex structure hematite ore, such as hematite ore and impurities with uneven distribution of particle size, hematite ore with large content of fine particle, hematite ore with small amount of magnetite and the gangue minerals containing quartz or kaolin.
The hematite mineral was mainly composed of magnetite, hematite with uneven distribution, and gangue minerals are quartz. After a comprehensive analysis of ore properties, Xinhai designed the follwing hematite separation process: stages grinding, gravity separation- magnetic separation- reverse flotation process--- about 60% coarse concentrate and tailings obtained by grinding; gravity separation timely selected qualified coarse concentrate and got rid of coarse tailings; fine-grained treated by the strong magnetic separation- reverse flotation process.
This process has reasonability in economy and advance in technology. The final indexes: feeding grade 23.15%, concentrate grade 65.95%, tailings grade 10.05%; this result wins the praise of clients.
A hematite in Philippines, the annual output of 700000 tons; Xinhai designed two stages desliming process; riffling treated by one roughing, one cleaning and three scavenging; the middling of first scavenging returned to second desliming process. Comprehensive indexes are 69.7% concentrate grade and 65.4% recovery rate.
A hematite in Jiangxi with extremely fine particle distribution was colloidal hematite, which is very difficult to separate. Xinhai designed the magnetic roasting-magnetic separation process. Finally, the concentrate grade reached nearly 62%, the recovery rate was 80%.
A hematite ore dressing plant in America, daily output of about 2100t, gangue minerals are quartz, calcium magnesium minerals, Xinhai adopted one stage crushing, one stage autogenous grinding and two stages pebble grinding, and the final grinding size was -0.025mm accounted for 80%.
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