Method for efficiently concentrating cobalt and nickel from low-grade nickeliferous laterite ore

Abstract

The invention provides a method for efficiently concentrating cobalt and nickel from a low-grade nickeliferous laterite ore. The method is based on mine-phase reconstruction, and the ore is subject to physical treatment, high temperature chlorination and reduction roasting to convert the nickel and the cobalt in the ore from oxide or composite oxide (silicate and ferrite) mineral into magnetic metal or alloy, magnetic separation method or combined floatation-magnetic separation method is used for separation to concentrate the cobalt and the nickel. The method is used for treating the low-grade nickeliferous laterite ore (Ni is 0.2-2.0%), contents of the nickel ore concentrate is more than ten times of that of the crude nickel ore; and the nickel recovery is more than 80%.

Description

technical field

[0001] The invention belongs to the field of nonferrous metallurgy, and relates to a method for extracting nickel from nickel ore, in particular to a method for enriching nickel and cobalt from low-grade laterite nickel ore. Background technique

[0002] Nickel is a metal with abundant reserves on the earth. The world's terrestrial nickel reserves are about 470 million tons, of which 60% belong to lateritic nickel deposits, and 40% belong to magmatic copper-nickel sulfide deposits. At present, the nickel produced by the world's nickel industry mainly comes from nickel sulfide ore resources, accounting for about 60% to 65% of the total output, and the rest comes from nickel oxide ore. However, with the depletion of nickel sulfide ore on the earth, the proportion of nickel produced from nickel oxide ore is increasing rapidly. It is estimated that by 2010 the production of nickel from nickel oxide ore will exceed the production of nickel from nickel sulphide or...

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