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Process for directly reducing ferrochrome powder ore by microwave and crucible special for same

A kind of ferrochromium powder, direct technology, applied in the process and the crucible field dedicated to the process, to achieve the effect of low price, cost reduction, and expanded source

Inactive Publication Date: 2011-05-11
兰州三普电力有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the application of microwave heating in the metallurgical process has become a research hotspot, but it is still in the experimental stage in microwave pyrometallurgy, and it is still in its infancy in the field of chromite reduction.

Method used

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  • Process for directly reducing ferrochrome powder ore by microwave and crucible special for same
  • Process for directly reducing ferrochrome powder ore by microwave and crucible special for same
  • Process for directly reducing ferrochrome powder ore by microwave and crucible special for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1, 444g of South African ferrochrome fine ore, 48g of silica fume, 72g of anthracite coal powder, and 36g of bituminous coal, after mixing evenly, spread it in a crucible with a thickness of 3cm; put it into a 4KW microwave experimental furnace, and heat it to 1460°C , Reduction for 120 minutes, 220g of the product was tested and known to be ferrochromium carbon, which contained Cr: 51.53%, Si: 1.61%, C: 4.45%, and the recovery rate of Cr was 85%.

Embodiment 2

[0024] Embodiment 2, 417g of South African ferrochrome fine ore, 53g of silica fume, 76g of anthracite powder, and 41g of bituminous coal powder, after mixing evenly, spread in a crucible with a thickness of 3.2cm; send it into a 4KW microwave experimental furnace, and heat to 1480°C, reduction for 100 minutes, 205g of product was obtained, which was known as ferrochromium carbon, which contained Cr: 52.08%, Si: 2.07%, C: 4.63%, and the recovery rate of Cr was 85.3%.

Embodiment 3

[0025] Embodiment 3, 400g of South African ferrochrome fine ore, 47g of silica fume, 72g of anthracite powder, 37g of bituminous coal powder, after mixing evenly, spread in the crucible, the material thickness of paving is 4cm; Send in 4KW microwave experiment furnace, be heated to 1480 ℃, reduced for 100 minutes, and obtained 200 g of the product, which was known as ferrochromium carbon by laboratory tests, which contained Cr: 51.56%, Si: 1.95%, C: 4.36%, and the recovery rate of Cr was 85.6%.

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Abstract

The invention discloses a process for directly reducing ferrochrome powder ore by microwave, comprising the following specific steps of: (a) preparing a furnace charge including 67-74 percent of ferrochrome powder ore, 18-23 percent of reducing agent and 8-10 percent of solvent; and (b) uniformly bulking and paving the furnace charge in the crucible at the paving thickness of 3.0-4.0cm, adding an anti-sticking layer in a main body of the crucible, sequentially adding an heat-insulating layer and a fixing layer for fixing the heat-insulating layer outside the main body and heating the furnace charge in the crucible to 1,450-1,480 DEG C and reducing for 90-120 minutes; and carrying out the crushing by a jaw crusher and electromagnetic separation on the reduced furnace charge to obtain granular carbon ferrochrome. In the invention, the reduced products contains chrome of 48-50 percent; the metallization rate is not less than 78 percent and the recovery rate of Cr is not less than 85 percent, which are equivalent to indexes of an ore heating furnace product; in addition, the traditional process for melting ferrochrome by carbon coke and blue carbon can be eliminated and the non-coke carbon metallurgy can be realized.

Description

technical field [0001] The invention relates to a process for producing carbon ferrochrome, in particular to a process for directly reducing ferrochrome powder ore by microwaves to obtain carbon ferrochrome and a special crucible for the process. technical background: [0002] At present, carbon ferrochrome is produced by submerged arc furnace, which has the disadvantages of high energy consumption, heavy pollution, difficult process control and poor working conditions. With the increasing requirements for energy saving, emission reduction and carbon emission reduction, this process has been eliminated, and it has become an urgent task to transform the traditional ferroalloy industry with high technology. [0003] Microwave belongs to clean energy, and its heating efficiency is as high as 95%, which is much higher than that of general heating methods (only 30%~40%). It still has the advantages of energy saving, emission reduction and easy control. Not only that, but als...

Claims

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Application Information

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IPC IPC(8): C22B5/10C22B4/06F27B14/10
Inventor 魏文彭镜鑫田立忠
Owner 兰州三普电力有限公司
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