Multi-functional composite additive for intensifying direct reduction of low-grade superfine hematite

A technology of composite additives and hematite, applied in the field of iron and steel metallurgy, to achieve the effect of improving quality, improving the grade of iron concentrate, and coarse particle size

Active Publication Date: 2010-05-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on additives for direct reduction of low-grade iron ore

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] For the low-grade ultrafine hematite with a raw ore iron grade of 24.8% and an embedded particle size of 5-10 microns, the added components are ferric tetroxide: 45%, calcium carbonate: 45%, according to 8% of the raw ore iron quality. Sodium humate: 10% of the multifunctional composite additive of the present invention, when the reverse flotation-direct reduction-magnetic separation process is used to treat the low-grade ultrafine hematite with a raw ore iron grade of 24.8%, the obtained iron concentrate grade is 88.34 %, the iron recovery rate is 70%.

Embodiment 2

[0018] For the low-grade ultrafine hematite with a raw ore iron grade of 24.8% and an embedded particle size of 5-10 microns, the added components are ferric oxide: 50%, calcium carbonate: 40%, according to 8% of the raw ore iron quality. Sodium humate: 10% of the multifunctional composite additive of the present invention, when the reverse flotation-direct reduction-magnetic separation process is used to treat the low-grade ultrafine hematite with a raw ore iron grade of 24.8%, the obtained iron concentrate grade is 90.12 %, the iron recovery rate is 75.3%.

Embodiment 3

[0020] For the low-grade ultrafine hematite with a raw ore iron grade of 24.8% and an embedded particle size of 5-10 microns, the added components are ferric oxide: 55%, calcium carbonate: 35%, according to 8% of the raw ore iron quality. Sodium humate: 10% of the multifunctional composite additive of the present invention, when the reverse flotation-direct reduction-magnetic separation process is used to treat the low-grade ultrafine hematite with a raw ore iron grade of 24.8%, the obtained iron concentrate grade is 89.91 %, the iron recovery rate is 78.41%.

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Abstract

The invention relates to a multi-functional composite additive for intensifying direct reduction of low-grade superfine hematite, which consists of the following components: iron oxides, calcium carbonate and sodium humate. The multi-functional composite additive has reasonable ratio of the components, can effectively improve the strength of low-grade iron ore and pellets and reductibility of the pellets, and promotes ferrite grains to grow; a reverse floatation direct reduction-magnetic separation process can be utilized to produce directly reduced iron powder for steelmaking at one step, the steel production flow is effectively shortened, energy is saved and consumption is reduced; and the multi-functional composite additive has wide component sources and low cost, is suitable for large-scale industrial production, and is particularly applied to the low-grade superfine hematite.

Description

Technical field: [0001] The invention discloses a multifunctional composite additive for strengthening the direct reduction of low-grade ultrafine hematite. It belongs to the technical field of iron and steel metallurgy. Background technique [0002] In recent years, the rapid development of my country's iron and steel industry has led to resource shortages, which has greatly promoted the development of low-grade iron ore resources. For the development of low-grade iron ore resources, various beneficiation methods can be used, such as gravity separation, magnetic separation, flotation and the combination of various beneficiation processes; magnetization roasting-magnetic separation-reverse flotation or direct reduction-magnetic Selected and other combined process of beneficiation and smelting. However, for low-grade ultra-fine hematite, due to the characteristics of low iron grade, fine iron oxide grains and encapsulation by silicate minerals, the iron grade of pellets is ...

Claims

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Application Information

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IPC IPC(8): C22B1/24
Inventor 朱德庆潘建李启厚春铁军周仙霖肖永忠陈屏璋
Owner CENT SOUTH UNIV
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