Method for comprehensively utilizing magnesium and iron in nickel laterite ore

Abstract

The invention discloses a method for comprehensively utilizing magnesium and iron in a nickel laterite ore. The method comprises the following steps of: intensifying leaching liquid of nickel laterite ore, taking magnesium-containing ore as a neutralizer, removing the iron by adopting a two-section iron removal method, performing iron and aluminum separation on the obtained iron-removing filter residue, neutralizing the obtained iron-removing filtrate to obtain precipitates of nickel, cobalt, manganese, zinc, copper and chromium by utilizing the magnesium-containing ore, respectively recovering, concentrating, filtering, performing vacuum drying dehydration and thermal decomposition on the obtained magnesium sulfate solution, and finally obtaining the activated magnesium oxide. The iron and magnesium in nickel laterite ore are comprehensively utilized, the sulfuric acid is recycled in the system, and the method has the advantages of environment friendliness and recycling economy.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal hydrometallurgy, in particular to a method for comprehensive utilization of ferromagnesium in laterite nickel ore. Background technique [0002] At present, the two major methods of processing laterite nickel ore in the world are: hydrometallurgy uses high-pressure leaching to process low-magnesium laterite nickel ore to produce electrolytic nickel; pyrometallurgy uses rotary kiln-electric furnace (RKEF) method to process low-iron laterite nickel ore to produce nickel iron. At first in China, the sulfuric acid heap leaching method was used to leach the lateritic nickel ore in Yuanjiang, Yunnan. Later, the composite wet smelting method of sulfuric acid heap leaching and sulfuric acid tank leaching was used to treat the silicon-magnesium-nickel ore and limonite imported from abroad. Type of mixed laterite nickel ore. Sulfuric acid heap leaching has a low leaching rate of nickel, resulting...

AI Technical Summary

Problems solved by technology

However, this patented technology still has the following problems: first, the nickel leaching rate is not high enough, and can only be increased from the original 90% to 96%. Neutralization, there is still 20wt% nickel in the pre-neutralization slag that has not been leached, including 4wt% nickel in the leaching slag, and these useful metal elements such as nickel and cobalt will be lost with the leaching slag and pre-neutralization slag

Thirdly, magnesite is used as neutralizing agent, because magnesite is not available in other regions except Liaoning, my country, so this technology has not been popularized and applied.

[0007] Although the above-mentioned patented technology has dismantled all the useful elements in the laterite nickel ore, the magnesium and iron after the disintegration have not yet adopted a reasonable process plan for comprehensive recycling, especially the neutralizer for hydrolyzing iron has not been solved. Well, the product plan for comprehensive recovery of magnesium has not been solved

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