Settling separation method for nuetralized slurry and wet smelting method for nickel oxide ore

Abstract

An object of the present invention is to provide a settling separation process for a neutralized slurry in which a neutralization step is efficiently performed for a leachate obtained by the leaching of nickel and cobalt from a nickel oxide ore, and further a neutralized precipitate obtained by precipitation of impurity components can effectively be separated and removed while inhibiting the filtration failure; and to provide a hydrometallurgical process for a nickel oxide ore, in which the above process is applied. In the present invention, a neutralization step is performed by using a magnesium oxide for a leachate obtained by the leaching of nickel and cobalt from a nickel oxide ore to obtain a neutralized slurry, and a neutralized precipitate is separated and removed by the addition of a cationic flocculant into the neutralized slurry.

Description

technical field [0001] The present invention relates to a sedimentation separation method of a neutralized slurry and a wet smelting method of a nickel oxide ore, and more specifically relates to a neutralized slurry obtained by neutralizing a leachate obtained by leaching nickel and cobalt from a nickel oxide ore The sedimentation and separation method of raw materials, and the wet smelting method of nickel oxide ore using this method. [0002] This application claims priority based on Japanese Patent Application No. Japanese Patent Application No. 2012-254569 for which it applied in Japan on November 20, 2012, These are taken in this application by referring these applications. Background technique [0003] As a method of recovering valuable metals from nickel oxide ore, a high-pressure acid leaching method (High Pressure Acid Leach method; hereinafter referred to as the HPAL method.) is performed. In the HPAL method, in order to efficiently recover nickel and cobalt as v...

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Problems solved by technology

[0008] However, with regard to neutralization using magnesium oxide, although impurities in the leachate can be effectively converted into neutralized precipitates, when the neutralized precipitates are subjected to solid-liquid separation in the subsequent process, clogging of the filter cloth occurs. Problems such as poor filtration and reduction in filtration speed

Furthermore, there is a problem that the neutralized sediment becomes SS (suspended matter) and is mixed into the supernatant after solid-liquid separation, causing further poor filtration and a decrease in filtration speed.

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