Cr-Fe powder ore cold-hardened pellet binder and process for pelleting by using same

A technology of cold-setting pellets and binders, which is applied in the field of binders, can solve the problems of organic binders burning out, pellets losing strength, and high material surface temperature, and achieve the elimination of crushing and powdering, comprehensive The effect of cost reduction and smelting output increase

Inactive Publication Date: 2012-03-21
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

However, in the submerged arc furnace for smelting ferrochrome, the temperature of the material surface is as high as about 800°C. At the same time, the furnace gas contains oxygen, and the organic binder will be burned out quickly, causing the pellets to lose their strength and pulverize, resulting in furnace conditions. Deterioration, lower output, higher energy consumption

Method used

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  • Cr-Fe powder ore cold-hardened pellet binder and process for pelleting by using same
  • Cr-Fe powder ore cold-hardened pellet binder and process for pelleting by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, a kind of novel chromite fine ore cold-setting pellet binder, its each component and weight are respectively: silicon micropowder 29kg, lightly burnt magnesia powder 12kg, sodium tripolyphosphate 0.08kg; The three materials are mixed vigorously in a roller mixer to make a uniform mixture; using the process of making pellets with the binder, 20kg of the binder is used, mixed with 213kg of South African ferrochrome powder, Shenmulan carbon 13.3 kg of powder, after 2-3 minutes of dry mixing on the roller mixer, 20kg of strengthening agent, continue to stir vigorously for 10 minutes, then discharge, and press it into pellets with a diameter of 20mm through a double-roller briquetting machine. Wet pellet strength ≥ 4 times (the average number of times 10 pellets fall on the steel plate at a height of 0.5m without breaking), dry pellet strength ≥ 8 times (10 pellets fall on the steel plate from a height of 1 meter, and the number of unbroken average times). Aft...

Embodiment 2

[0025] Embodiment 2, a new type of chromite powder ore cold-setting pellet binder, its components and weight are respectively: 27.5 kg of silicon micropowder, 9 kg of lightly burned magnesium oxide powder, and 0.07 kg of sodium tripolyphosphate; Said three kinds of materials are made into homogeneously mixed materials through vigorous stirring in a roller mixer; using the process of making pellets with said binder, 20 kg of said binder is taken, mixed with 110 kg of South African ferrochrome fine ore, 110 kg of Brazilian ferrochrome powder, 16 kg of Shenmulan carbon powder, dry mixed in a roller mixer for 2-3 minutes, added 20kg of strengthening agent, continued to stir vigorously for 10 minutes, and the material was discharged to a roller briquetting machine, and pressed into Pellets with a diameter of 20mm. Wet bulb drop strength of 0.5 meters ≥ 5 times; after drying at 180 ℃, wind speed 1.0m / s ~ 1.8m / s, 30 minutes, 1 meter drop strength ≥ 15 times. When heated at 1000°C, t...

example 3

[0026]Example 3, a novel chromite powder ore cold-setting pellet binder, its components and weight are respectively: 32 kg of silicon micropowder, 8 kg of lightly burned magnesia powder, and 0.08 kg of sodium tripolyphosphate; The three kinds of materials are stirred vigorously in a roller mixer to make a homogeneously mixed material; using the process of pelletizing the binder, 28kg of the binder is used, and 170kg of South African ferrochrome powder is mixed with Madagascar. 170 kg of Si chromite powder ore, 20 kg of Shenmulan charcoal powder, dry mixed in a roller mixer for 2-3 minutes, 30 kg of strengthening agent, continue to stir vigorously for 10 minutes, and the output is pressed by a double-roller ball press into pellets with a diameter of 20 mm. Wet bulb drop strength ≥ 4 times at 0.5 meters; after drying at 180°C, wind speed 1.0m / s~1.8m / s, and 30 minutes, 2m drop strength ≥8 times; Pulverization; 1350 ° C, 2 hours of heating and reduction, the sphere only compresse...

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Abstract

The invention discloses a Cr-Fe powder ore cold-hardened pellet binder comprising the following components in percentage by weight: 70-80 percent of silicon micro powder, 19.81-29.78 percent of light calcined magnesia and 0.19-0.22 percent of trimeric sodium phosphate. The invention also discloses a process for pelleting by using the binder, which comprises the following steps of: adding 6-8 percent by weight of binder in 76-84 percent by weight of Cr-Fe powder ore; then adding 4-8 percent by weight of blue carbon powder; after dryly mixing for 2-3min by an edge milling type stirring mill, adding 6-8 percent by weight of reinforcer, and wetly mixing for 5-10min; then discharging and putting into a roller type ball press for pressing to form pellets; and then drying at the temperature of 150-200 DEG C and the wind speed of 1.0-1.8m / s for 30-40min to obtain finished Cr-Fe pellets. The carbon ferrochrome produced by the invention has the advantages of increasing the yield by 15-20 percent, reducing the electricity consumption by 12-16 percent and lowering the comprehensive cost by 10-12 percent.

Description

technical field [0001] The invention relates to a binder for making chromite powder ore into balls, in particular to a binder for cold-setting pellets of chromite powder ore and a process for making pellets with the binder. Background technique [0002] With the increasing shortage of chromium ore resources, the supply of lump ore is gradually reduced, and the production of carbon ferrochrome from fine ore pellets has become the main production situation at present and in the future. There are two ways to make fine ore pellets. In the early stage, sintered pellets were used, which obtained pellets with high strength through sintering above 1000°C; Pellets of sufficient strength. The application of cold-set pellets cancels the high-temperature sintering process of pellets, which not only saves investment, but also is a new process for saving energy, reducing consumption and reducing environmental pollution, which is worth promoting. [0003] Iron ore production has long pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243
Inventor 魏文彭镜鑫田立忠
Owner 兰州三普电力有限公司
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