Method for producing nickel sulfate and cobaltous sulfate through purification of laterite nickel ore sulfuric acid leaching solution and silica gel chelate resin

Abstract

The invention provides a method for producing nickel sulfate and cobaltous sulfate through purification of a laterite nickel ore sulfuric acid leaching solution and silica gel chelate resin. The method comprise the steps that (1), laterite nickel ores (the limonite type, transition layer type and detritus layer type) are subjected to ore grinding to -0.15 mm of ore powder accounting for 95% or above; (2), sulfuric acid and water are added into the transition layer type of laterite nickel ore after ore grinding for atmospheric pressure leaching to separate a leaching solution 1 from filter residues 1; (3), the limonite type of laterite nickel ore is placed into an autoclave, and sulfuric acid and water are added for high pressure leaching to separate a leaching solution 2 from filter residues 2; (4), the leaching solutions are added into the detritus layer of laterite nickel ore for neutralization impurity-removing leaching to separate a neutralization solution from filter residues 3; (5), hydrogen peroxide is added for reaction precipitation, and solid-liquid separation is conducted to separate a filtrate from filter residues 4; (6), the filtrate is subjected to silica gel chelateresin separation to produce nickel sulfate and cobaltous sulfate; (7), pulverized coal is added into the filter residues, magnetizing roast is conducted, then weak magnetic separation is conducted, and iron ore concentrate and tailings are separated; (8), manganese removing of a tail liquid is conducted; and (9), the tailings is discharged.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and relates to a method for producing nickel-cobalt from laterite nickel ore, in particular to a method for producing nickel-cobalt sulfate by extracting laterite nickel ore leaching solution and silica gel chelating resin. Background technique [0002] Laterite nickel ore resources are surface weathered crustal deposits formed by weathering-leaching-deposition of nickel sulfide ore rock mass. In the world, laterite nickel ore is distributed in tropical countries within 30 degrees north and south of the equator line, and concentrated in tropical-subtropical regions around the Pacific Ocean Regions mainly include: Cuba and Brazil in the Americas; Indonesia and the Philippines in Southeast Asia; Australia, New Caledonia and Papua New Guinea in Oceania. 70% of my country's nickel ore reserves are concentrated in Gansu, followed by Xinjiang, Yunnan, Jilin, Sichuan, Shaanxi, Qinghai and 7 provinces of H...

AI Technical Summary

Problems solved by technology

[0008] (3) Only a small amount of cobalt is associated with the ore, no sulfur, no calorific value

[0035] (3) There are many solid and liquid wastes in the pressurized acid leaching method, which pollutes the environment

[0036] However, these new processes are still immature, and there are still some technical difficulties, such as the difficulty in separating the solid and liquid of the leaching liquid in atmospheric leaching, and the problem that organic acids cannot be recycled in bioleaching. The leaching rate of nickel and cobalt in laterite nickel ore is generally lower than that of pressure acid leaching

The solid-liquid separation of various methods cannot meet the standard requirements of subsequent metal purification processes, and the cost is high; therefore, it is necessary to develop a new laterite nickel ore extraction technology to solve the above problems

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