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A method for microwave heating reduction-magnetic separation dephosphorization of high phosphorus hematite

A technology of microwave heating and hematite, which is applied in the direction of fluidized bed furnaces, furnaces, furnace types, etc., can solve the problems of easy fusion of reactors and large damage to reactors, and achieve simple and easy crushing and ensure iron grades , Improve the effect of reduction rate

Active Publication Date: 2020-01-10
ANHUI UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low melting point of the composite sodium salt additive, the melting of the material and the reactor is prone to fusion, which will cause great damage to the reactor.

Method used

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  • A method for microwave heating reduction-magnetic separation dephosphorization of high phosphorus hematite
  • A method for microwave heating reduction-magnetic separation dephosphorization of high phosphorus hematite

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Effect test

Embodiment 1

[0042] A high-phosphorus oolitic hematite ore contains 43% iron and 0.87% phosphorus. Phosphorus is mainly stored in collophanite. The material ratio of the high-phosphorus oolitic hematite reduction is that the ratio of high-phosphorus hematite to mixed coal powder (anthracite coal powder and coconut shell carbon powder is mixed at 3:1) is 1:0.1 by weight, and the alkali Degree: 0.4, the ratio of binder is 4% by weight, the ratio of dephosphorization agent is 7.5% by weight, and the type of dephosphorization agent is Na 2 CO 3 , CaCl 2 Mixed at 1:1, the composite catalyst is 3% by weight, and the perforation density is 5 holes / cm 2 . Place the prepared pellets in a microwave heating furnace and heat them from room temperature to 900°C at a controlled heating rate of 17°C / min, then from 900°C to 1100°C at a heating rate of 10°C / min, and then keep warm for 10 minutes After taking it out, it is immediately placed in hot water for heat quenching treatment, so as to facilitate...

Embodiment 2

[0044] A high-phosphorus oolitic hematite ore contains 43% iron and 0.87% phosphorus. Phosphorus is mainly stored in collophanite. The material proportion of this high-phosphorus oolitic hematite reduction is that the proportioning ratio of high-phosphorus hematite and mixed coal powder (anthracite coal powder and coconut shell carbon powder are mixed at 3.5:1) is 1:0.15 by weight, alkali Degree: 1.0, the ratio of binder is 4% by weight, the ratio of dephosphorization agent is 7.5% by weight, and the type of dephosphorization agent is Na 2 CO 3 , the composite catalyst is 5% by weight, and the perforation density is 6 holes / cm 2 . Place the prepared pellets in a microwave heating furnace and heat from room temperature to 900°C at a controlled heating rate of 19°C / min, then from 900°C to 1200°C at a heating rate of 12°C / min, and then keep warm for 15 minutes Take it out and put it in hot water immediately for heat quenching treatment. Afterwards, put the reduced pellets int...

Embodiment 3

[0046] A high-phosphorus oolitic hematite ore contains 46.4% iron and 0.69% phosphorus. Phosphorus is mainly stored in fluorapatite. The material proportion of this high-phosphorus oolitic hematite reduction is that the proportioning ratio of high-phosphorus hematite and coal powder (anthracite coal powder and coconut shell carbon powder are mixed at 3.2:1) is 1:0.18 by weight, and the alkalinity For: 1.2, the proportioning of binder is 3% by weight percentage, the proportioning of dephosphorization agent is 5% by weight percentage, the kind of dephosphorization agent is CaCl 2 and Na 2 SO 4 , mixed by 4:1, the composite catalyst is 2% by weight, and the perforation density is 8 holes / cm 2 . Place the prepared pellets in a microwave heating furnace and heat from room temperature to 900°C at a controlled heating rate of 20°C / min, then from 900°C to 1250°C at a heating rate of 13°C / min, and then continue to keep warm for 3 minutes Take it out and put it in hot water immediat...

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Abstract

The invention discloses a microwave heating and reduction-magnetic separation and dephosphorization method for high phosphorus hematite, and belongs to the technical field of direct reduction of ironores and mineral processing. The microwave heating and reduction-magnetic separation and dephosphorization method for the high phosphorus hematite comprises the following steps: adding water in the high phosphorus hematite, a reducing agent, an adhesive, a dephosphorizing agent and a composite catalyst, mixing at a certain ratio and pelletizing, and piercing and drying pellets; placing the dried pellets in a microwave heating furnace and carrying out heating reduction and dephosphorization treatment to obtain reduced spherules; pulverizing and grinding the reduced spherules and then placing the spherules in a conical ball-milling machine, and adding water and finely grinding the spherules; and carrying out magnetic separation treatment on reduced ore pulp obtained after fine grinding to obtain high-quality iron powder. By the scheme, high-efficiency dephosphorization treatment of high phosphorus roe-shaped hematite can be realized, and the reducing rate of the reduced iron powder is high.

Description

technical field [0001] The invention belongs to the technical field of iron ore direct reduction and mineral processing, and in particular relates to a microwave heating reduction-magnetic separation dephosphorization method of high-phosphorus hematite. Background technique [0002] In recent years, the rapid development of my country's iron and steel industry has resulted in a rapid increase in the demand for iron ore. However, due to the lack of high-quality iron ore resources in my country and the low utilization rate of complex and refractory iron ore, the domestic iron ore market is in a serious state of short supply. Therefore, in recent years, nearly 90% of iron ore in my country's steel industry needs to be imported, and imported iron The soaring price of ore has led to a substantial increase in the cost of importing iron ore in my country, which has seriously affected the development of my country's steel industry. [0003] Among the complex and refractory iron ore ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243C22B1/11C21B13/00
CPCC21B13/0066C21B13/008C22B1/11C22B1/2406C22B1/243
Inventor 雷鹰何文浩陈雯李雨王雪松何思奇
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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