Method for producing hematite for ironmaking
US-9752209-B2 · Sep 5, 2017 · US
Process for producing hemataite for ironmaking
US9981858B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9981858-B2 |
| Application number | US-201515111067-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 9, 2015 |
| Priority date | Jan 17, 2014 |
| Publication date | May 29, 2018 |
| Grant date | May 29, 2018 |
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Abstract
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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
Opening claim text (preview).
The invention claimed is: 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 using a wet cyclone under a condition that the wet cyclone is adjusted to have a setting between 1 μm or less and 2 μm or less for the overflow as a classification size 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 having a magnetic field strength of 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. 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%. 3. 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
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Classifications
Magnetic separation of bulk or dry particles in mixtures · CPC title
by using a cyclone · CPC title
High gradient magnetic separators · CPC title
- C01G49/06Primary
Ferric oxide [Fe2O3] · CPC title
Combinations with other devices, not otherwise provided for · CPC title
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- What does patent US9981858B2 cover?
- 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 …
- Who is the assignee on this patent?
- Sumitomo Metal Mining Co
- What technology area does this patent fall under?
- Primary CPC classification C01G49/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 29 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).