Method for realizing phosphorus removal of oolitic high-phosphorus iron ores by combining enhanced gas-based reduction and high-temperature smelting separation

A technology of high-phosphorus iron ore and enhanced gas, which is applied in the field of iron and steel metallurgy-ironmaking, can solve the problems of low metallization rate of ore powder gas-based reduction, difficulty in metallization rate exceeding 70%, and affecting the separation effect of slag and iron. The effect of reducing energy consumption, fast reduction speed, and sufficient gas-solid contact

Inactive Publication Date: 2013-03-20
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

However, due to the unique onion-like structure of oolitic pyrite and the compactness of the ring-shaped apatite layer, the gas-based reduction metallization rate of the ore powder is low.
In the study, we found that in CO or H 2 Atmosphere, reduction temperature of 800-1000°C, and reduction time of 2-5 hours, the metallization rate of the ore powder is difficult to exceed 70%, which seriously affects the separation effect of slag and iron in the next step of slag-iron melting process
In view of the poor gas-based reduction effect of oolitic high-phosphorite iron ore powder, this patent proposes to use microwave pretreatment method to strengthen the gas-based reduction effect of mineral powder

Method used

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  • Method for realizing phosphorus removal of oolitic high-phosphorus iron ores by combining enhanced gas-based reduction and high-temperature smelting separation
  • Method for realizing phosphorus removal of oolitic high-phosphorus iron ores by combining enhanced gas-based reduction and high-temperature smelting separation
  • Method for realizing phosphorus removal of oolitic high-phosphorus iron ores by combining enhanced gas-based reduction and high-temperature smelting separation

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Experimental program
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Effect test

Embodiment 1

[0043] Fig. 1 is the process flow diagram of realizing the dephosphorization and iron extraction of oolitic high-phosphorus iron ore in the present invention; Including the following steps:

[0044] (1).Material crushing: The oolitic pyrite is crushed to a particle size of less than 1mm, and the obtained mineral powder is dried at 300°C for 3 hours.

[0045] (2). Microwave pretreatment: Weigh 1000g of ore powder and place it in microwave heating equipment; insert a K-type thermocouple into the ore powder material layer, and the voltage measured by the thermocouple will be directly displayed as the temperature of the ore powder by the digital instrument; The microwave input power of the device is controlled by the on-off thyristor, and the digital instrument controls the on-off of the thyristor. Set the microwave power of the reactor so that the heating rate of the ore powder reaches 150-200°C / min, and the maximum temperature of the ore powder is set at 800°C; when the tempera...

Embodiment 2

[0050] (1).Material crushing: Oolite is crushed to a particle size of less than 1mm, and the obtained mineral powder is dried at 300°C for 5 hours.

[0051] (2). Microwave pretreatment: Weigh 1000g of ore powder and place it in microwave heating equipment, and insert a K-type thermocouple into the ore powder material layer. The voltage measured by the thermocouple is directly displayed as the mineral powder temperature by the digital instrument; the microwave input power of the reactor is controlled by the on-off thyristor, and the digital instrument controls the on-off of the thyristor. Set the microwave power of the reactor so that the heating rate of the ore powder reaches 150-200°C / min; the maximum temperature of the ore powder is set at 800°C, and when the temperature of the ore powder material layer reaches the set temperature, keep the temperature for 3 minutes, stop microwave heating, and cool naturally to room temperature.

[0052] (3). Fluidized bed reduction: The m...

Embodiment 3

[0056] (1).Material crushing: The oolitic iron ore is preliminarily crushed to a particle size of less than 1mm, and the obtained mineral powder is dried at 300°C for 4 hours.

[0057] (2). Microwave pretreatment: Weigh 1000g of ore powder and place it in microwave heating equipment; insert a K-type thermocouple into the material layer, and the voltage measured by the thermocouple is directly displayed as the temperature of the ore powder by a digital instrument, and the reactor microwave The input power is controlled by the off-type thyristor, and the digital instrument controls the on-off of the thyristor. Set the microwave power of the reactor so that the heating rate of the ore powder reaches 150-200°C / min, and the maximum temperature of the ore powder is set at 800°C. After the temperature of the ore powder material layer reaches the set temperature, the temperature is kept constant for 3 minutes, and the microwave heating is stopped.

[0058] (3). Fluidized bed reduction...

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Abstract

The invention discloses a method for realizing phosphorus removal of oolitic high-phosphorus iron ores by combining enhanced gas-based reduction and high-temperature smelting separation, which realizes direct preparation of low-phosphorus molten iron from oolitic high-phosphorus iron ores. The invention is characterized in that the method comprises the following steps: crushing materials; performing microwave pretreatment; performing fluidized bed gas-based reduction; adjusting a slag system; and performing high-temperature smelting separation. Compared with the existing method for treating oolitic high-phosphorus iron ores, the method disclosed by the invention has the following remarkable beneficial effects: ore powder does not need to be subjected to fine grinding treatment, thereby reducing the energy consumption for ore grinding; through the microwave pretreatment, the oolitic structure of the high-phosphorus iron ore powder and compact apatite layers are destroyed, and multiple tiny cracks are formed in ore powder particles; the ore powder subjected to the microwave pretreatment is deeply reduced within a relatively short time in the fluidized gas-based reduction process, and the metallization rate of the ore powder can be up to 85% or above; and after the slag system of the ore powder is subjected to fine adjustment, the reduced ore powder is subjected to high-temperature smelting separation to be directly prepared into thermal state low-phosphorus molten iron having a phosphorus content of 0.2-0.4%, and meanwhile, the metal iron recovery rate is up to 85% or above. The invention has the characteristics of high iron recovery rate and good phosphorus removal effect, and provides a new dressing and smelting technology for the utilization of oolitic high-phosphorus iron ores which are difficult to treat.

Description

Technical field: [0001] The invention relates to a process for removing phosphorus and improving iron from oolitic high-phosphorus iron ore, in particular to a process for efficiently recovering metallic iron and directly preparing hot low-phosphorus molten iron. It belongs to the iron and steel metallurgy-ironmaking field. Background technique: [0002] In China's Hunan and Hubei regions and the Yangtze River Basin, a large number of oolitic phosphorus-containing iron ores are buried, and the proven reserves in the western Hubei region are about 7 billion tons. The main classes of this mineral are hematite, dolomite, clinochlorite, quartz and apatite (fluorine or hydroxyfluoroapatite). Phosphorus mainly exists in the form of apatite (hydroxyapatite or fluoroapatite); part of this apatite is filled in the middle of oolitic grains, but a considerable part is in the form of rings and hematite formation. layers, forming an onion-like layered structure. How to efficiently uti...

Claims

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Application Information

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IPC IPC(8): C21B11/00C21B13/00
Inventor 唐惠庆郭占成王军伟刘伟迪
Owner UNIV OF SCI & TECH BEIJING
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