Production method for hematite for iron production

Inactive Publication Date: 2015-02-19
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027]First, is possible to easily obtain hematite that has low-grade sulfur and can be used as an iron-making raw material.
[0028]Second, a raw material that can be cheaply and stably procured is used. Thus, hematite with the low-grade sulfur can be obtained inexpensively.
[0029]Third, wastes, such as a leach residue, discharged in a refining process can be applied to the iron-making raw materials, and

Problems solved by technology

The iron oxide that is a raw material of the steel is a limited resource, and furthermore it is gradually hard to obtain high-quality iron ore required to maintain a quality of steel.
However, the leach residues have no special utility value, and have been scrapped to a residue disposal yard.
For this reason, it has been a grave challenge how to secure the disposal yards for an enormous amount of leach residues generated along with the smelting.
Furthermore, the leach residue of the HPAL process cannot be directly used for the aforementioned iron-making raw material.
The reason is that the leach residue of the HPAL process contains gangue and impurities, particularly sulfur, in additi

Method used

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  • Production method for hematite for iron production
  • Production method for hematite for iron production
  • Production method for hematite for iron production

Examples

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example 1

[0042]Nickel oxide ore having 1% nickel grade and 46 to 48% iron grade was adjusted to be a slurry of 30 to 40% by weight, and then was mixed with sulfuric acid of 64% by weight. Subsequently, the slurry was charged into a pressure device, heated to 240 to 250° C., and maintained for one hour, and a leachate was obtained by leaching nickel in the ore (HPAL).

[0043]After the leaching, the leachate was cooled to about 70° C., and then slaked lime was added to neutralize a surplus acid (neutralization). The slurry containing a leach residue after the surplus acid was neutralized (hereinafter the leach residue after the neutralization is referred to as “neutralized residue’) was subjected to solid-liquid separation using Nutsche and a filtering bottle, and was separated into the leachate and the neutralized residue (solid-liquid separation).

[0044]In the neutralized residue, an iron grade was 49.9%, and a sulfur grade was 1.5%.

[0045]Next, the neutralized residue was equally divided into s...

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Abstract

Provided is a production method for refining iron oxide (hematite), which has such a low sulfur content as to be used as a raw material for ironmaking from a leach residue containing iron oxide, the leach residue being produced by a high pressure acid leach (HPAL) process and being a raw material that can be cheaply and stably procured. In the method of producing (high purity) hematite for ironmaking by a process of adding an oxidant and sulfuric acid to nickel oxide ore and then leaching nickel, a leach residue obtained after the leaching of nickel is heated to 600° C. or more, and preferably 800° C. or more and 1400° C. or less.

Description

BACKGROUND[0001]1. Field of the Invention[0002]The present invention relates to a production method for refining a leach residue obtained by hydrometallurgical refining of nickel oxide ore into hematite that can be used as an iron-making raw material and has low-grade sulfur.[0003]2. Description of the Related Art[0004]In steel smelting, a method of charging iron ore containing iron oxide into a blast furnace along with a reductant such as coke, heating and melting the iron ore under a reducing atmosphere to obtain crude steel, and refining the crude steel in a converter to obtain desired steel has been used.[0005]The iron oxide that is a raw material of the steel is a limited resource, and furthermore it is gradually hard to obtain high-quality iron ore required to maintain a quality of steel.[0006]Meanwhile, with respect to nickel becoming a raw material of stainless steel, technology for smelting low-grade oxide ore as a raw material due to a tendency toward resource exhaustion o...

Claims

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Application Information

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IPC IPC(8): C22B3/22
CPCC22B3/22C01G49/06C22B23/0461C01P2006/80C22B3/20C01B17/507Y02P10/20
Inventor SASAKI, HIDEKIMITSUI, HIROYUKIKAN, YASUMASA
Owner SUMITOMO METAL MINING CO LTD
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