Sumitomo Metal Mining Company, Ltd.

Hirofumi Shouji

Yoshitomo Ozaki

Hiroshi Kobayashi

Tatsuya Higaki

Satoshi Asano

Keiji Kudo

Itsumi Matsuoka

Manabu Enomoto

Keiji Kudou

Shin-Ichi Heguri

Hideki Sasaki

Hiroyuki Mitsui

Masaki Imamura

Shin-ichi Heguri

Yasumasa Kan

Hidemasa Nagai

Shin-ya Matsumoto

Hiroshi Takenouchi

Naoyuki Tsuchida

Shota Sanjo

Takumi Matsugi

Shin-Ya Matsumoto

Provided is a method for obtaining a solution having a high concentration of nickel and/or cobalt from an alloy that contains copper as well as nickel and/or cobalt, in a waste lithium-ion battery. A method for treating an alloy comprises: a leaching step Sfor subjecting an alloy that contains copper as well as nickel and/or cobalt to a leaching treatment by using an acid solution in the presence of a sulfiding agent to obtain a leachate and a leaching residue; and a reduction step Sfor adding a reducing agent to a part of the obtained leachate and performing a reduction treatment to obtain a post-reduction solution and a reduction residue, wherein in the leaching step S, the leachate that has not been provided in the reduction treatment in the reduction step S, is repeatedly used as part or all of the acid solution added in the leaching treatment.

Method for treating alloy

A wet smelting method for nickel oxide ores from which nickel, cobalt, etc. are recovered is provided with which it is possible to reduce the consumption of an acid in leaching, such as sulfuric acid, and to recover valuable metals. The method comprises: step (A) in which nickel oxide ores as a raw material are separated into a limonite-type ore having a low magnesium content and a saprolite-type ore having a high magnesium content; step (B) in which the saprolite-type ore is subjected to normal-pressure leaching under given standardized leaching conditions using the pressure leachate obtained by pressure leaching in step (C); and step (C) in which the limonite-type ore obtained in step (A) is mixed with the normal-pressure leaching residue obtained in step (B) and the mixture is reacted with sulfuric acid in an acidic atmosphere having a high temperature and a high pressure, thereby conducting pressure leaching.

Wet smelting method for nickel oxide ore

Provided is a method for recovering scandium, with which it is possible to easily and efficiently recover high-purity scandium from nickel oxide ores. This method for recovering scandium involves passing a solution containing scandium through an ion exchange resin, then subjecting the eluant eluted from the ion exchange resin to solvent extraction and separating the extraction residual liquid and the extraction agent after extraction, then performing an oxalation process on the extraction residual liquid to obtain a scandium oxalate precipitate, and roasting the precipitate to obtain scandium oxide, wherein the method is characterized in that an amine-based extraction agent is used as the extraction agent for solvent extraction.

Method for recovering high-purity scandium

Provided is a production method for refining iron oxide (hematite), which has such a low sulfur content as to be used as an iron-making raw material, from a leach residue containing iron oxide produced by a high pressure acid leach (HPAL) process. In the method for refining iron oxide for ironmaking by a process of adding sulfuric acid to nickel oxide ore and then leaching nickel from the nickel oxide ore using a pressure vessel, an amount of the sulfuric acid added is 150 kg or more and 220 kg or less per ton of nickel oxide ore.

Method for producing hematite for ironmaking

Provided is a method for producing hematite for ironmaking, wherein high purity hematite, which can be used as an iron-making raw material, is cheaply and efficiently recovered from a leach residue containing iron oxide produced by a high pressure acid leach (HPAL) process. This method for producing (high purity) hematite for ironmaking in a process of adding a mineral acid and an oxidant to ore containing iron and valuable metals and then leaching the valuable metals under high pressure and high temperature includes (1) a neutralization step of adding a neutralizer to a leachate obtained under high pressure and high temperature to form a leach slurry, (2) a solid-liquid separation step of separating the leach slurry obtained in the neutralization step (1) into a leach residue and the leachate, and (3) a classification step of classifying the leach residue into the hematite and gangue components.

A hydrometallurgical process based on pressure leaching at elevated temperature for recovering nickel from nickel oxide ores, characterized by a simplified and efficient process as a whole, realizing a simplified leaching stage, reduced neutralizer consumption and precipitate production in the neutralization stage, and efficient use of recycled water. The hydrometallurgical process of the present invention, comprising a leaching stage which stirs the slurried ore in the presence of sulfuric acid at 220 to 280&#xb0; C. to produce the leached slurry; solid-liquid separation stage which washes the leached slurry in multi-stages to produce the pregnant liquor and leached residue, the former containing nickel and cobalt; neutralization stage which treats the pregnant liquor in the presence of calcium carbonate incorporated to keep the pH level at 4 or less, while suppressing oxidation of the liquor, to produce the neutralization precipitate slurry and mother liquor for nickel recovery, the former containing trivalent iron; and a sulfide precipitation stage which blows hydrogen sulfide gas into the mother liquor to produce the sulfide solution and barren liquor, the former containing nickel and cobalt.

Hydrometallurgical process of nickel oxide ore

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Niihama, Japan

Hirofumi Shouji