A method for comprehensive recovery of valuable metals in high magnesium silicon laterite nickel ore

Abstract

The invention relates to a method for comprehensively recovering valuable metals from high-magnesium-silicon laterite nickel ore, and belongs to the technical field of metallurgy. The method comprisesthe following steps: crushing high-magnesium-silicon laterite nickel ore to be -200 meshes to obtain high-magnesium-silicon laterite nickel ore powder, then uniformly mixing the high-magnesium-silicon laterite nickel ore powder with an additive and pressing the mixture into a cylindrical material, then treating the cylindrical material at constant temperature of 700-900 DEG C for 40-60 min, and performing cooling with a furnace to obtain a mixed material A; uniformly mixing the mixed material A and a reducing agent and pressing the mixture into a material sheet with diameter of 10-30 mm; placing the material sheet in a vacuum furnace, performing vacuumizing until inlet pressure is lower than 50 Pa, performing heating at constant rate of 3-5 DEG C / min until the temperature is 650-900 DEG C, then performing heating at constant rate of 10-15 DEG C / min until the temperature is 1300-1600 DEG C, and performing treatment at constant temperature for 0.5-4 h to obtain magnesium vapor and slag;condensing and crystallizing the magnesium vapor to obtain metallic magnesium, cooling the slag with the furnace to a temperature not higher than 100 DEG C, and taking out the slag; magnetically separating the slag to obtain ferronickel and calcium silicon compounds.

Description

technical field [0001] The invention relates to a method for comprehensively recovering valuable metals in high-magnesium-silicon laterite-nickel ore, belonging to the technical field of metallurgy. Background technique [0002] High-magnesium silicon laterite nickel ore, also known as silicon magnesium nickel ore, is characterized by relatively high magnesium, silicon, and nickel content, and low iron content. During the formation of such minerals, nickel and magnesium are stored in snakes through lattice substitution. Among them, serpentine is an ore that is extremely difficult to destroy, so this kind of mineral is suitable for extraction by pyrometallurgy. Among them, the relatively mature pyrometallurgical smelting process includes: rotary kiln drying pre-reduction-electric furnace smelting method (also known as " RKEF"), sintering-blast furnace reduction smelting, sintering-blast furnace reduction vulcanization smelting, reduction roasting-magnetic separation process, ...

AI Technical Summary

Problems solved by technology

These pyrotechnics mainly extract the nickel in the ore, while ignoring the extraction of magnesium, so that the magnesium enters the smelting slag and causes a large amount of slag. The magnesium content in these slags is 15-40%, and it cannot be recycled twice. Utilization, direct stockpiling will not only cause environmental pollution, but also cause a huge waste of resources

However, the hydrometallurgical extraction of nickel mainly has the problems of large acid consumption, difficult treatment of the obtained magnesium-containing acid waste liquid, and high cost.

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