Treatment method of nickel-containing eluvial ores

Abstract

The invention discloses a treatment method of nickel-containing eluvial ores. The treatment method comprises the following steps: (1) dividing the nickel-containing eluvial ores into magnesian ores and iron ores; (2) carrying out leaching treatment on the iron ores by utilizing sulfuric acid to obtain a leaching solution containing ferric sulfate, wherein the content of free acid in the leaching solution containing the ferric sulfate is 40-45g / l; (3) carrying out first neutralization treatment on the leaching solution containing ferric sulfate by utilizing the magnesian ores to enable the content of the free acid in the leaching solution to be lowered to 5g / l, and obtaining a solution after neutralization and leaching residues containing silicon dioxide; (4) carrying out second neutralization treatment on the solution after neutralization obtained in the third step by utilizing magnesium hydrate, and maintaining the pH value to be 1.0-1.5 to obtain precipitated iron concentrate and a solution after iron removal; and (5) carrying out third neutralization treatment on the solution after iron removal obtained in the fourth step by utilizing the magnesium hydrate to enable the pH value of the solution after iron removal to remain between 7.0-7.5, and obtaining nickel-cobalt hydroxide precipitates and a magnesium sulfate solution.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a treatment method for nickel-containing residual ore. Background technique [0002] According to the geological origin of nickel oxide ore, the ore layer is usually divided into limonite layer, transition layer and saprolite layer from top to bottom. Among them, the limonite layer is generally high in iron content and low in magnesium content, which is suitable for high-pressure leaching technology; the content of nickel and magnesium in the transition layer has increased, and it is suitable for the reduction roasting ammonia leaching process; although the nickel content in the lower saprolite layer is relatively high , but the magnesium content is also very high, and the pyrotechnics is generally used to smelt ferronickel or nickel matte. [0003] Although nickel oxide ore transition layer minerals can be processed by reduction roasting technology, such as the Cuban Nigaro plant. Ho...

AI Technical Summary

Problems solved by technology

However, the generated slag has poor properties and high sulfur content, which is not suitable for use as building materials.

Subsequent leachate purification and removal of iron and aluminum uses lime slurry as a neutralizing agent, which produces a large amount of gypsum, increases the amount of slag in the system, and also increases the loss of valuable components

[0005] Therefore, the current method of processing nickel-containing residual ore still needs to be improved

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