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Method for preparing hematite oxidized pellets

A technology for oxidizing pellets and hematite, which is applied in the field of preparing hematite oxidized pellets, can solve the problems of narrow roasting temperature range, high consolidation temperature, and long roasting time, and achieve shortened roasting time, high strength, The effect of high oxidation roasting efficiency

Inactive Publication Date: 2017-06-30
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current hematite pellets have a high consolidation temperature (1300°C-1350°C), a narrow range of roasting temperature, long roasting time, and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] According to the method for preparing hematite oxidized pellets of the present invention, hematite oxidized pellets are prepared, specifically as follows:

[0026] A hematite concentrate was used to prepare oxidized pellets, and its main chemical components were: TFe 65.68%, FeO 0.55%, MgO 0.06%, SiO 2 1.26%, CaO 0.04%, Al 2 o 3 1.53%. The iron concentrate particle size -0.074mm content accounts for more than 90%, and its specific surface area is 1703cm 2 / g. Fully mix the above iron concentrate powder with anthracite, bentonite and water, wherein the mass ratio of iron concentrate powder, anthracite, bentonite and water is 83.5:1.0:1.5:14, wherein the fixed carbon content in the anthracite powder is greater than 80% by mass , and 70% of the anthracite powder passed through a 100 mesh sieve. The above-mentioned mixture is pressed into a spherical green ball with a diameter of 16mm in a double-roller ball press with a punching function. The number of holes in the ...

Embodiment 2

[0028] According to the method for preparing hematite oxidized pellets of the present invention, hematite oxidized pellets are prepared, specifically as follows:

[0029] A hematite concentrate was used to prepare oxidized pellets, and its main chemical components were: TFe 68.32%, FeO 0.95%, MgO 0.08%, SiO 2 2.76%, CaO 0.12%, Al 2 o 3 1.13%. The iron concentrate particle size -0.074mm content accounts for more than 90%, and its specific surface area is 1716cm 2 / g. Fully mix the above iron concentrate powder with anthracite, bentonite and water, wherein the mass ratio of iron concentrate powder, graphite, bentonite and water is 81.5:1.5:1.0:16, wherein the fixed carbon content in graphite is greater than 80% by mass , and the particle size of graphite not greater than 0.149mm accounts for more than 70% by mass. The above-mentioned mixture is pressed into an oblate green ball with a diameter of 24mm in a double-roller ball press with a punching function mold. The number...

Embodiment 3

[0031] According to the method for preparing hematite oxidized pellets of the present invention, hematite oxidized pellets are prepared, specifically as follows:

[0032] A hematite concentrate was used to prepare oxidized pellets, and its main chemical components were: TFe 65.68%, FeO 0.55%, MgO 0.06%, SiO 2 1.26%, CaO 0.04%, Al 2 o 3 1.53%. The iron concentrate particle size -0.074mm content accounts for more than 90%, and its specific surface area is 1703cm 2 / g. Fully mix the above iron concentrate powder with anthracite, bentonite and water, wherein the mass ratio of iron concentrate powder, petroleum coke, bentonite and water is 83.5:1.2:1.3:14, wherein the fixed carbon content in petroleum coke is greater than 80 % by mass, and the portion of the petroleum coke whose particle size is not greater than 0.149mm accounts for more than 70% by mass. The above-mentioned mixture is pressed into an oblate green ball with a diameter of 8 mm in a double-roller ball press wit...

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Abstract

The invention discloses a method for preparing hematite oxidized pellets. The method comprises the following steps: mixing hematite powder, carbonaceous additives, bentonite and water according to the mass ratio of 79.5-86:1-1.5:1-2:10~ 18 ratio to obtain a material mixture; said material mixture is pressed into balls to obtain green balls, wherein said green balls have at least one opening therethrough; and said green balls are sequentially dried, preheated And oxidation roasting treatment, in order to obtain the hematite oxide pellets. The method can effectively prepare and obtain high-reactivity hematite oxidized pellets, and the obtained hematite oxidized pellets have low roasting fuel consumption, high strength and good metallurgical performance, and are especially suitable for use in gas-based shaft furnaces.

Description

technical field [0001] The invention relates to the technical field of metallurgical pellet preparation, in particular to a method for preparing hematite oxide pellets. Background technique [0002] At present, iron and steel enterprises are facing unprecedented survival difficulties. "Innovation-driven, cost reduction, structural adjustment and development mode" have become the main measures for iron and steel enterprises to deal with the current situation. The production of pellets from hematite will become a trend. However, the current hematite pellets have high consolidation temperature (1300°C-1350°C), narrow range of roasting temperature, long roasting time and high energy consumption. [0003] Therefore, it is imperative to improve the metallurgical properties of hematite pellets to solve the roasting problem of hematite. Contents of the invention [0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For th...

Claims

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Application Information

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IPC IPC(8): C22B1/243C22B1/02
CPCC22B1/243C22B1/02C22B1/2406
Inventor 冯鲁兴邓君唐敬坤韩志彪曹志成汪勤亚吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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