Kaolin high gradient magnetic separation process

Kaolin HGMS process: kaolin staining impurities (e.g., hematite, etc.) has weak magnetism, it is possible to use a high gradient magnetic separator removed. In the United States, the PEM-84 wet high gradient magnetic separator can reduce Fe2O3 in kaolin ore from 0.9% to 0.6%, and Ti2O3 from 1.8% to 2.0% to 0.8%. This high-gradient magnetic separator uses stainless steel wool as a medium. When the field strength is 1.5 to 2.0T, it consumes 270-500kw. China has carried out wet research on Hunan acid, Lingyang, Boluo and Hengling soils [3-6], and all of them have obtained good test results, especially the removal of iron and titanium in kaolin by vibration high gradient magnetic separation. Very good test indicators. According to the comparison test results of China's CLY500 vibrating high gradient magnetic separator and the US PEM-84 high gradient magnetic separator, the high gradient magnetic field of China is seen from the content of iron and titanium impurities and whiteness. The machine performance is better than the United States.

Since some impurities in kaolin portion of iron is present in the form of silicates, very weak magnetism, and titanium present in the form of rutile, the magnetic separation method is difficult to work, so the flow is usually accompanied by flotation, selective flocculation, etc. Other jobs to improve the quality of the product.

In recent years, superconducting magnetic separators have been successfully applied to kaolin sorting, which not only reduces energy consumption, but also greatly increases the field strength, and the quality of kaolin concentrate is also higher. The Eriez superconducting magnetic separator features rapid magnetization and achieves the highest design field strength (5T) in 60 seconds with a short degaussing time, which greatly reduces the time required to flush magnetic impurities from the magnet during load cycling. Its energy consumption is low, about 80% less than conventional magnetic separator, and the processing capacity is large, up to 100t/h. The United Kingdom has tested a reciprocating spiral superconducting magnetic system that is similar in design to a conventional can magnetic magnetic filter, except that it retains the superconducting magnet in an excited state during the duty cycle without switching control. Continuous operation. The 3048mm, superconducting and high gradient magnetic separator designed by Humboldt Company of Germany has simple structure, low operation and maintenance cost and good stability.

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