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Coal nickel selective reduction mechanism


Nickel corrosion resistance, oxidation resistance, high temperature, high strength and good ductility characteristics, so widely used, more than 60% nickel for stainless steel production. With the mining of nickel resources, nickel sulfide ore and high grade nickel literate resources dwindling, while there are a lot of grade literate nickel mine in about1% to 2% of an increasing cause for concern. As regards cost, the price of nickel pig iron as a valuation standard nickel grade nickel pig iron, produced by the higher nickel grade, the higher the economic value of nickel pig iron, thereby increasing the grade of nickel in the nickel-iron concentrate has an important research value.

In recent years, Beijing University of Science and Technology, for refractory late rite nickel ore direct reduction roasting and found out adding flux, coal, nickel, iron can play a role in selective reduction, which can make the late rite nickel nickel ore as much as possible to restore, which the iron is less restore, improve the grade of nickel in the nickel-iron concentrate. The comparison experiments show that the stone coal and anthracite, stone coal as reductant proceeds of nickel-iron concentrate nickel, iron grade higher than the same amount of anthracite nickel, iron grade, nickel, iron recovery the same amount of anthracite. Stone coal as the reductant, nickel in the calcined product is mainly in the form of tainted; anthracite as a reductant, nickel in the calcined product is mainly in the form of Kama cite. Stone coal as a reducing agent, the formation of metallic iron, while the anthracite iron formation, so the stone coal as a reductant nickel restore more selective than the anthracite as a reductant. Stone coal and anthracite coal selective reduction in addition to the impact of fixed carbon, ash is an important factor.

 




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