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Sintering technology of ferrochrome mineral powder

A chromite powder and process technology, applied in the field of iron and steel metallurgy, can solve the problems of no new process for sintering chromium ore powder, etc., and achieve the effects of improving strength and thermal stability, enhancing adaptability, and improving strength and output

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

AI Technical Summary

Problems solved by technology

The patented technologies for strengthening conventional iron ore powder sintering include pellet sintering, pellet sintering and sintering machine roasting pellets, etc., but there are no reports or patents on the new chromium ore powder sintering process

Method used

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  • Sintering technology of ferrochrome mineral powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The grade of ferrochrome fine powder 1 is 47.10% Cr 2 o 3 , the original particle size is -100 mesh accounting for about 75%. Use a ball mill to carry out fine grinding pretreatment on the ore until the specific surface area is 1100cm 2 / g after pelletizing and sintering. The ratio of bentonite is 1.5%, the water content of pellets is 9.5%, and the pelletizing time is 12 minutes. The composition is 5-16mm 75.8%. The optimized pellet sintering process parameters are: the amount of coke powder is 7.5% (70% is added before pelletizing, and then 30% is added outside the green pellets), the moisture content of the mixture is 9.5%, the height of the material layer is 550mm, The drying temperature is 300-350°C, the drying negative pressure is 4kPa, the drying time is 3min, the ignition temperature is 1100°C, the ignition negative pressure is 5kPa, the ignition time is 1.5min, and the sintering negative pressure is 8kPa. Good sintering indicators have been achieved: the yie...

Embodiment 2

[0026] Use a ball mill to carry out fine grinding pretreatment on ferrochromium fine powder 1 until the specific surface area is 1300cm 2 / g after pelletizing and sintering. Under the conditions of 1.5% bentonite ratio, 9.2% pelleting moisture, and 9min pelletizing time, the prepared green pellets have a drop strength of 6.5 times / 0.5m, a compressive strength of 13.5N / piece, and a burst temperature of 450°C. The particle size composition is 5-16mm 82.5%. The optimized pellet sintering process parameters are: the amount of coke powder is 7.0% (70% of which is added before pelletizing, and then 30% of which is added outside the green pellets), the moisture content of the mixture is 9.5%, and the height of the material layer is 580mm. The drying temperature is 300-350°C, the drying negative pressure is 4kPa, the drying time is 3min, the ignition temperature is 1100°C, the ignition negative pressure is 5kPa, the ignition time is 1.5min, and the sintering negative pressure is 8kPa...

Embodiment 3

[0028] Use a ball mill to carry out fine grinding pretreatment on ferrochrome fine powder 1 until the specific surface area is 1500cm 2 / g after pelletizing and sintering. Under the conditions of 1.2% bentonite ratio, 9.0% pelleting moisture, and 9min pelletizing time, the prepared green pellets have a drop strength of 7.1 times / 0.5m, a compressive strength of 15.2N / piece, and a burst temperature of 440°C. The particle size composition is 5-16mm 89.5%. The optimized pellet sintering process parameters are: the amount of coke powder is 6.8% (70% is added before pelletizing, and then 30% is added outside the green pellets), the water content of the mixture is 9.5%, and the height of the material layer is 600mm. The drying temperature is 300-350°C, the drying negative pressure is 4kPa, the drying time is 3min, the ignition temperature is 1100°C, the ignition negative pressure is 5kPa, the ignition time is 1.5min, and the sintering negative pressure is 8kPa. Good sintering indicat...

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Abstract

The invention relates to a sintering technology of ferrochrome mineral powder, which comprises the following steps: adding bentonite binder, fuel and water for uniform mixing after more than 65 percent of mineral powder is ground to -0.074mm, and pelletizing; then, coating a layer of fuel on the surface of the spherulite; loading the product into a sintering machine, with the height of the material layer being 550 to 700mm; and igniting for sintering after drying and preheating, and cooling, smashing and sieving thermal sintered ore, thus obtaining the finished product sintered ore with particle size of 3-40mm and return mineral powder with particle size of -3mm. The technology has simple method and convenient operation, and by activating chromite, the technology reduces the reaction temperature, improves strength and output of the sintered ore, saves consumption of solid fuel, has strong adaptability to material, can realize industrialized production, and is especially suitable for sintering of granular ferrochrome mineral powder or ferrochrome concentrate.

Description

Technical field: [0001] The invention discloses a sintering process of chromite powder, which belongs to the technical field of iron and steel metallurgy. Background technique [0002] Chromium is one of the important strategic materials. It has been widely used in metallurgical industry, refractory material and chemical industry because of its characteristics of hardness, wear resistance, high temperature resistance and corrosion resistance. In the metallurgical industry, chromite is mainly used to produce ferrochrome alloy and metallic chromium. Ferrochromium is used as an additive to steel to produce a variety of special steels with high strength, corrosion resistance, wear resistance, high temperature resistance, and oxidation resistance; metal chromium is mainly used to smelt special alloys with cobalt, nickel, tungsten and other elements. These special steels and special alloys are indispensable materials for aviation, aerospace, automobiles, shipbuilding, and defense...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243
Inventor 潘建朱德庆李启厚仉宏亮赵强罗艳红
Owner CENT SOUTH UNIV
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