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Method for producing hematite for iron production

一种制造方法、赤铁矿的技术，应用在氧化铁/氢氧化铁、氧化铁、工艺效率的提高等方向，能够解决很难有效的原料、不能忽视分级矿石成本和劳力、铁品位低等问题，达到废弃成本减少、实现环境风险、构筑容易的效果

Active Publication Date: 2014-12-10
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] However, the cost and labor used to grade the ore cannot be ignored
In addition, there are many gangue components in the leaching residue, and if it is used as it is, the iron grade is low, and it is hardly an effective raw material.

Method used

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  • Method for producing hematite for iron production
  • Method for producing hematite for iron production
  • Method for producing hematite for iron production

Examples

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Embodiment 1

[0079] After adjusting nickel oxide ore with a nickel grade of 1% and an iron grade of 46 to 48% into a slurry of 30 to 40% by weight, it is mixed with 98% by weight of sulfuric acid, and then the slurry is charged into a pressurizing device and heated to 240~250°C and maintain for 1 hour, leaching the nickel in the ore.

[0080] After leaching, cooling to about 70°C, the remaining acid was neutralized by adding parent rock of the composition shown in Table 1 excavated from the same mine.

[0081] Next, the slurry containing the neutralization residue after neutralizing the remaining acid was solid-liquid separated using a suction filter and a filter bottle, and separated into a leachate and a neutralization residue. The iron grade of the neutralized residue was 49.9% (71.4% in terms of hematite grade).

[0082] Next, the obtained neutralized residue was supplied to a wet cyclone and classified into underflow (U / F) and overflow (O / F).

[0083] Table 2 shows classification co...

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Abstract

Provided is a method for producing hematite for iron production, whereby high purity hematite, which can be used as a raw material for producing iron, is cheaply and efficiently recovered from leach residue containing iron oxide produced by the high pressure acid leach (HPAL) process. This method for producing (high purity) hematite for iron production involves a process in which a mineral acid and an oxidizing agent are added to ore containing iron and valuable metals, and the valuable metals are leached at a high temperature and high pressure. Said method includes: (1) a neutralization step in which a neutralizer is added to leachate obtained at a high temperature and high pressure, forming a leach slurry; (2) a solid-liquid separation step in which the leach slurry obtained in the neutralization step (1) is separated into a leach residue and leachate; and (3) a classification step in which the leach residue obtained by solid-liquid separation is classified and separated into hematite and gangue components.

Description

technical field [0001] The present invention relates to a method for producing hematite for iron-making, which is high-purity hematite that can be used as a raw material for iron-making as an iron ore substitute, by a wet method. Background technique [0002] The following method is used in iron and steel smelting: put iron ore containing iron oxide together with reducing agents such as coke into a blast furnace for heating, reduction and melting to obtain crude steel, and refine the crude steel in a converter to obtain the target steel. [0003] Iron oxide as its raw material is a limited resource, and it has become increasingly difficult to obtain high-quality iron ore necessary to maintain the quality of steel. [0004] On the other hand, with regard to nickel as a raw material for stainless steel, smelting technology using low-grade oxidized ore as a raw material has been developed and put into practical use as the resources of sulfide ores that have been used in the pas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B1/00C22B1/02C22B3/00C22B15/00C22B23/00
CPCC01G49/06C22B3/44Y02P10/20C01P2004/61
Inventor 佐佐木秀纪菅康雅尾崎佳智榎本学庄司浩史桧垣达也三井宏之
Owner SUMITOMO METAL MINING CO LTD
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