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Method for preparing ferrochrome through microwave heating of chromite powder

A technology of chromite ore powder and ferrochrome alloy, which is applied in the field of microwave heating of chromite ore powder to prepare ferrochrome alloy, can solve the problems of high energy consumption and high production cost, and achieve the effects of low economic cost, low cost and fast heating rate

Inactive Publication Date: 2017-12-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The defects of high production cost and high energy consumption still exist in the prior art to be overcome, so it is still necessary to optimize the production process of low-carbon ferrochrome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The method for preparing ferrochrome alloy by heating chromite ore powder with microwave, its specific steps are as follows:

[0019] First chromite (chromite comprises the following mass percentage components: Cr 2 o 3 40.82%; SiO 2 5.02%;Al 2 o 3 13.04%; CaO2.4%; MgO10.83%; TFe19.85%; 2 o 3 / FeO:1.69; crush until the particle size is below 200 mesh to obtain chromite powder, then mix the chromite powder with 75# ferrosilicon alloy and calcium oxide evenly according to the mass ratio of 4:3:3, under the microwave power of 1000W , after microwave heating at 1100° C. for 10 min at a constant temperature and sintering, after the constant temperature sintering is completed, the slag is removed to obtain a ferrochrome alloy.

[0020] The chromium content in the ferrochromium alloy obtained above is 29.93%, the iron content is 42.24%, and the conversion rate of chromium is 70.19%.

Embodiment 2

[0022] The method for preparing ferrochrome alloy by heating chromite ore powder with microwave, its specific steps are as follows:

[0023] First chromite (chromite comprises the following mass percentage components: Cr 2 o 3 40.82%; SiO 2 5.02%;Al 2 o 3 13.04%; CaO2.4%; MgO10.83%; TFe19.85%; 2 o 3 / FeO:1.69; crush until the particle size is below 200 mesh to obtain chromite powder, then mix the chromite powder with 75# ferrosilicon alloy and calcium oxide evenly according to the mass ratio of 5:3.5:4, under the microwave power of 1200W , after sintering at a constant temperature of 1200° C. for 30 minutes by microwave heating, slag removal is carried out after the sintering at a constant temperature, and ferrochrome alloy is obtained.

[0024] The chromium content in the ferrochromium alloy obtained above is 58.45%, the iron content is 12.49%, and the conversion rate of chromium is 83.34%.

Embodiment 3

[0026] The method for preparing ferrochrome alloy by heating chromite ore powder with microwave, its specific steps are as follows:

[0027] First chromite (chromite comprises the following mass percentage components: Cr 2 o 3 40.82%; SiO 2 5.02%;Al 2o 3 13.04%; CaO2.4%; MgO10.83%; TFe19.85%; 2 o 3 / FeO:1.69; crush until the particle size is below 200 mesh to obtain chromite powder, then mix the chromite powder with 75# ferrosilicon alloy and calcium oxide evenly according to the mass ratio of 4.5:3.3:3.5, under the microwave power of 1500W , after sintering at a constant temperature of 1450° C. for 40 minutes by microwave heating, the slag is removed after the sintering at a constant temperature to obtain a ferrochrome alloy.

[0028] The chromium content in the ferrochromium alloy obtained above is 70.11%, the iron content is 15.67%, and the conversion rate of chromium is 97.09%.

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Abstract

The invention relates to a method for preparing ferrochrome through microwave heating of chromite powder, and belongs to the technical field of microwave metallurgy and chromite. The method comprises the following steps: the chromite is crushed into the chromite powder with the particle size smaller than 200 meshes, then the chromite powder is uniformly mixed with a 75# silicon-iron alloy and calcium oxide according to a mass ratio of 4-5 to 3-3.5 to 3-4, with a microwave power of 1000-1500W, after the microwave heating is carried out to enable the temperature to reach 1100-1450 DEG C and the sintering is carried out at the constant temperature for 10-40 minutes, slag is removed after the constant-temperature sintering is ended, so that the ferrochrome alloy is obtained. According to the method, the advantages that the material heating speed is high, the reduction temperature is low, time is short, the energy utilization rate is high and cleanness and zero pollution are achieved through the microwave metallurgy technology are brought into full play, the microwave silicothermic reduction method is used to smelt medium-carbon and low-carbon ferrochrome, the 75# silicon-iron alloy is used, so that the conversion rate of chromium is improved, the chromite powder can be directly used, building blocks are not needed, and therefore the smelting process is shortened, and energy conservation and consumption reduction are achieved.

Description

technical field [0001] The invention relates to a method for preparing ferrochrome alloy by heating chromite powder with microwaves, and belongs to the technical field of microwave metallurgy and chromite. Background technique [0002] Chromium is one of the important strategic materials and has been widely used in metallurgical industry, refractory material and chemical industry. Among them, the application proportion of chromite in the metallurgical industry is more than 80%, which is mainly used to produce ferrochrome alloy and metal chromium, and ferrochrome alloy is mainly used as an additive for steel to produce a variety of high-strength, corrosion-resistant, wear-resistant, resistant High-temperature, oxidation-resistant special steels are indispensable materials for aviation, aerospace, automobiles, shipbuilding, and defense industries to produce guns, missiles, rockets, ships, etc. With the rapid development of steelmaking technology, the production of special ste...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B34/32C22C35/00
CPCC22B1/16C22B34/32C22C35/005
Inventor 郭胜惠刘花代林晴彭金辉段钰郭秦
Owner KUNMING UNIV OF SCI & TECH
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