Method for comprehensive recovery of multiple metal of nickel, iron and magnesium in silicon-magnesium type laterite nickel ore

Abstract

The invention relates to a method for comprehensive recovery of multiple metal of nickel, iron and magnesium in a silicon-magnesium type laterite nickel ore, and belongs to the technical field of pyrogenic process-wet process combination in nonferrous metallurgy. The method comprises the steps that first, the silicon-magnesium type laterite nickel ore is subjected to drying, crushing and screeningpretreatment processes to obtain a fine ore; the obtained fine ore and anthracite and a promoter are evenly mixed to be formed into a pellet, and the pellet is subjected to reduction roasting to obtain a roasting ore; the obtained roasting ore is subjected to water quenching ball milling, and after ball milling, magnetic separation is conducted on ore pulp to obtain a nickel-iron alloy and tailings; the obtained tailings are subjected to acid leaching to obtain leaching residues and a leaching solution, and the leaching residues can be used as a building material; the obtained leaching solution is subjected to oxidizing, pH adjusting, impurity removing and purifying processes and then a refined magnesium sulfate solution is obtained; and a precipitation agent is added into the obtained refined magnesium sulfate solution, then precipitation, washing, drying and calcinations are conducted, and high-purity magnesium oxide is prepared. According to the method for comprehensive recovery ofthe multiple metal of the nickel, the iron and the magnesium in the silicon-magnesium type laterite nickel ore, the nickel-iron alloy is extracted through reduction roasting and magnetic separation,and the high-purity magnesium oxide is prepared through acid leaching, impurity removing and precipitation.

Description

technical field [0001] The invention relates to a method for comprehensive recovery of nickel, iron and magnesium in silicon-magnesium type laterite nickel ore, and belongs to the technical field of combined pyro-wet method in nonferrous metallurgy. Background technique [0002] Nickel is an important strategic reserve metal, which plays an important role in national economic construction and the establishment of high-level material and cultural life of human beings. The important raw material of the metal has become an indispensable important metal in the modern defense industry aerospace. Nickel resources are mainly nickel sulfide ore and laterite nickel ore, the former accounts for about 30%, and the latter accounts for about 70%. With the increasing depletion of nickel sulfide ore, the reserves have declined sharply, and the rational development and utilization of laterite nickel ore with abundant reserves has become a top priority. [0003] Magnesium oxide is an odorle...

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Problems solved by technology

[0005] Aiming at the development and utilization of low-grade silicon-magnesium-type laterite-nickel ore, a lot of research work has been done at home and abroad since the 1960s, and a series of research programs have been proposed, including rotary kiln drying pre-reduction-electric furnace smelting method , Dajiangshan method, rotary hearth furnace method, blast furnace vulcanization smelting method, blast furnace reduction smelting method, reduction roasting-ammonia leaching method, sulfuric acid high pressure acid leaching method, sulfuric acid atmospheric pressure leaching method, heap leaching method, chlorination water leaching method, chlorine Chemical segregation-magnetic separation, etc. Some technologies have been applied in industry, but the economic benefits are not ideal, making a large number of low-grade silicon-magnesium-type laterite-nickel ore resources unreasonable.

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