Process for producing hemataite for ironmaking

Patent metadata

Field	Value
Publication number	US-2016340201-A1
Application number	US-201515111067-A
Country	US
Kind code	A1
Filing date	Jan 9, 2015
Priority date	Jan 17, 2014
Publication date	Nov 24, 2016
Grant date	—

Abstract

Proposed is a process for separating a leach residue from which a hematite-containing material that can be used as a raw material for ironmaking can be obtained, and provided is a production process of hematite for ironmaking from the leach residue. The process for producing hematite for ironmaking using, as a raw material, the leach residue in a slurry state obtained from a hydrometallurgical plant for nickel oxide ore utilizing a high pressure acid leach process comprises in sequence: a first step of separating the leach residue in a slurry state into an overflow and an underflow using a wet cyclone; a second step of separating the overflow into a strong magnetic component and a weak magnetic component using a strong-magnetic-field magnetic separator utilizing magnetic force; and a third step of sintering the separated strong magnetic component at a temperature of 1150 to 1350° C. to form a sintered body.

First claim

1 . A process for producing hematite for ironmaking using, as a raw material, a leach residue obtained from a hydrometallurgical plant for nickel oxide ore utilizing a high pressure acid leach process, the process for producing hematite comprising at least the following steps in sequence:
a first step of separating the leach residue into an overflow and an underflow by a wet cyclone under a separating condition that setting of classification size is between 1 μm or less and 2 μm or less for the overflow; a second step of separating the overflow into a strong magnetic component and a weak magnetic component by a strong-magnetic-field magnetic separator utilizing magnetic force under a separating condition that a magnetic field strength is 5 to 20 [kGauss]; and a third step of sintering the separated strong magnetic component at a temperature of 1150 to 1350° C. to form a sintered body.

2 . (canceled)

3 . The process for producing hematite for ironmaking according to claim 1 , further comprising a dehydration step of adjusting a moisture content of the strong magnetic component to between 10% and 17%.

4 . The process for producing hematite for ironmaking according to claim 1 , comprising, after the third step, a crushing step of bringing particle size of the sintered body to 3 to 20 mm.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Ohara Go
• KAN Yasumasa
• Imamura Masaki

Classifications

• B03C2201/20

  Magnetic separation of bulk or dry particles in mixtures · CPC title

• C01G49/06 Primary

  Ferric oxide [Fe2O3] · CPC title

• B03C1/30

  Combinations with other devices, not otherwise provided for · CPC title

• B01D21/267

  by using a cyclone · CPC title

• C22B23/0453

  Treatment or purification of solutions, e.g. obtained by leaching (C22B23/0407 takes precedence) · CPC title