Method for producing metal iron powder by using deep reduction of rotary kiln

A rotary kiln and metal iron technology, applied in the direction of rotary drum furnace, furnace, furnace type, etc., can solve the problems of high price and high energy consumption, achieve good metallurgical performance, uniform particle size, and reduce dependence on coking coal resources

Inactive Publication Date: 2014-12-17
GUANGXI GAOPENG MINING IND SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for producing metal iron powder by using deep reduction of rotary kiln

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Embodiment 1

[0058] The raw iron ore is, for example, oolitic limonite (grade 35%), which belongs to refractory iron ore. The raw ore is crushed to -20mm by a crusher, and then powdered to -5mm by a sander. Add 5% limestone powder (-100 mesh) of raw iron ore mass to iron ore powder as desulfurizer, add 15% raw ore mass of anthracite powder (C≥55%) as reducing agent, and mix the three materials and press balls. The pellets are dried after pressing. The dried pellets are sent to the rotary kiln for preheating. The preheating temperature is controlled at 400°C for about 1.5 hours. After preheating, it enters the reduction section for reduction. The temperature is controlled at 900°C and the reduction time is about 3 hours. The reduction section requires the iron reduction rate to reach over 92%. Then enter the deep reduction time for about 1.5 hours. Deep reduction temperature is 1300°C. After deep reduction, iron metal grains are formed (iron metal grain size 0.1-15mm). After deep reducti...

Embodiment 2

[0060] The raw iron ore is, for example, oolitic limonite (grade 40%), which belongs to refractory iron ore. The raw ore is crushed to -20mm by a crusher, and then powdered to -5mm by a sander. Add 5% limestone powder (-100 mesh) of raw iron ore mass to iron ore powder as desulfurizer, add 15% raw ore mass of anthracite powder (C≥55%) as reducing agent, and mix the three materials and press balls. The pellets are dried after pressing. The dried pellets are sent to the rotary kiln for preheating, the preheating temperature is controlled at 450°C, and the time is about 1 hour; after preheating, it enters the reduction section for reduction, the temperature is controlled at 1100°C, and the reduction time is about 3 hours. The reduction section requires the iron reduction rate to reach over 92%. Then enter the deep reduction time for about 1.5 hours. Deep reduction temperature is 1250°C. After deep reduction, iron metal grains are formed (iron metal grain size 0.1-15mm). After ...

Embodiment 3

[0062] Add 6% limestone desulfurizer of raw ore quality to raw iron ore such as oolitic limonite (grade 45%) and mix, grind to below 5mm, add coal powder with 15% of raw ore weight, and directly send it into the primary rotary kiln for pretreatment Thermal reduction, the preheating temperature is controlled at 400°C, and the time is, for example, 1h; the reduction temperature is, for example, 1000°C, and the smelting time is 3h. The hot air flow generated by the combustion of raw materials and coal moves countercurrently, and the raw materials generate Fe 2 o 3 , Fe and other metals. After further deep reduction, the temperature is controlled at 1250°C, and the melting time is 2 hours. All the reduction and smelting is completed, and the black pig iron is quenched by the cooling water of the second rotary kiln. The temperature in the kiln is controlled at 150-220°C. The iron separated by crushing and magnetic separation is sand-like particles with a diameter of 1 mm. The iro...

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Abstract

The invention discloses a method for producing metal iron powder by using deep reduction of a rotary kiln. The method comprises the following steps: (1) pretreatment: raw iron ore, anthracite and limestone powder are ground to reach a certain fineness by adopting a ball grinder, are then mixed by a double-shaft mixer, and are pressed to form balls by a ball pressing machine; and (2) the deep reduction by the rotary kiln. The deep reduction specifically comprises the following substeps: (1) pellets are dried in a turning plate type drying machine, pass through a preheating section, a reduction section and a deep reduction section in the rotary kiln, and are finally discharged from the kiln for water quenching; and (2) the ore grinding, the screening and the magnetic separation are performed after the water quenching to obtain metal iron powder and iron particles. The method is characterized in that refractory iron ore incapable of being physically separated and enriched is firstly reduced to metal iron and conditions are created to polymerize and grow the metal iron; the separation and the enrichment of iron are realized through grinding and separation of a reduction product; and a new path is provided for the development and the utilization of the refractory iron ore.

Description

technical field [0001] The invention relates to a metal smelting method, in particular to a method for producing metal iron powder by deep reduction of a rotary kiln for low-grade refractory iron ore. Background technique [0002] At present, the proven low-grade iron ore reserves in China are about 12 billion tons. Due to the restriction of ore dressing technology, it cannot be mined and utilized at present. This type of iron ore is characterized by very fine particle size, and it is difficult to dissociate completely. High-grade iron ore concentrate cannot be obtained by physical beneficiation. Only by roasting can the crystal structure of iron be changed to promote the aggregation of metallic iron and the growth of particles so that it is easy to separate from the gangue. [0003] When the traditional ironmaking process reduces the refractory iron ore, it only converts the iron-containing minerals in the ore into metallic iron, without changing the distribution of iron...

Claims

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Application Information

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IPC IPC(8): B22F9/20C22B1/24C22B1/02C21B13/08
Inventor 陈寿清蒙坚杰
Owner GUANGXI GAOPENG MINING IND SCI & TECH
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