Method for preparing high carbon ferro-chrome by fusible chrome fine ore

A technology of high-carbon ferrochrome and chromium powder, which is applied in the field of high-carbon ferrochrome and its preparation, can solve the problems of insufficient submerged arc furnace load, unstable slag and iron discharge, poor gas permeability of the material layer, etc., and achieve cold strength Good, save power consumption, good air permeability

Inactive Publication Date: 2017-03-22
BERIS ENG & RES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the submerged arc furnace smelts fusible chromium powder ore, if the ingredients are not properly prepared, the following problems will occur: the load of the submerged arc furnace is insufficient, and the electrode is easily inserted; Unstable iron discharge, damage to the furnace mouth; increased power consumption, low recovery rate of ferrochrome, etc.

Method used

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  • Method for preparing high carbon ferro-chrome by fusible chrome fine ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) drying and sieving the fusible chrome powder ore to obtain no more than 6mm chrome powder ore and greater than 6mm chrome powder ore;

[0053] (2) Mix chromium powder no larger than 6mm, calcium oxide, and syrup in a ratio of 917:23:60, and press them into pellets. The pellet size was 75 x 40 x 23mm.

[0054] Mix chromium powder ore less than 6mm, dust ash, calcium oxide and syrup according to the ratio of 904:13:23:60, and press them into pellets. The pellet size was 75 x 40 x 23mm.

[0055] (3) The two types of pellets obtained in step (2) are mixed with the chrome powder ore larger than 6mm obtained in step (1), silica, magnesite, dolomite, and carbonaceous reducing agent according to a certain proportion and mixed. Table 1 shows the chemical composition and batching ratio of various types of ores put into the furnace (wherein, percentages are mass percentages, and batching ratios are weight ratios).

[0056] Table 1

[0057] Cr 2 o 3

FeO ...

Embodiment 2

[0061] (1) drying and sieving the fusible chrome powder ore to obtain no more than 6mm chrome powder ore and greater than 6mm chrome powder ore;

[0062] (2) Mix chromium powder no larger than 6mm, calcium oxide, and syrup in a ratio of 917:23:60, and press them into pellets. The pellet size was 75 x 40 x 23mm.

[0063] Mix chromium powder ore less than 6mm, dust ash, calcium oxide and syrup according to the ratio of 904:13:23:60, and press them into pellets. The pellet size was 75 x 40 x 23mm.

[0064] (3) The two types of pellets obtained in step (2) are mixed with the chrome powder ore larger than 6mm obtained in step (1), silica, magnesite, dolomite, and carbonaceous reducing agent according to a certain proportion and mixed. Table 2 shows the chemical composition and batching ratio of various types of ores put into the furnace (wherein, percentages are mass percentages, and batching ratios are weight ratios).

[0065] Table 2

[0066] Cr 2 o 3

FeO ...

Embodiment 3

[0070] (1) drying and sieving the fusible chrome powder ore to obtain no more than 6mm chrome powder ore and greater than 6mm chrome powder ore;

[0071] (2) Mix chromium powder no larger than 6mm, calcium oxide, and syrup in a ratio of 917:23:60, and press them into pellets. The pellet size was 75 x 40 x 23mm.

[0072] Mix chromium powder ore less than 6mm, dust ash, calcium oxide and syrup according to the ratio of 904:13:23:60, and press them into pellets. The pellet size was 75 x 40 x 23mm.

[0073] (3) The two types of pellets obtained in step (2) are mixed with the chrome powder ore larger than 6mm obtained in step (1), silica, magnesite, dolomite, and carbonaceous reducing agent according to a certain proportion and mixed. Table 3 shows the chemical composition and batching ratio of various types of ores put into the furnace (wherein, percentages are mass percentages, and batching ratios are weight ratios).

[0074] table 3

[0075] Cr 2 o 3

FeO ...

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Abstract

The invention provides a method for preparing high carbon ferro-chrome by fusible chrome fine ore. The method comprises the following steps that screening is conducted, specifically, raw material chrome fine ore is screened, and chrome fine ore with the granularity being equal to or less than 6 mm and chrome fine ore with the granularity being larger than 6 mm are obtained; pelletizing is prepared, specifically, mixture is obtained after the granularity being equal to or less than 6 mm is evenly mixed with binder, and then the mixture is pressed into the pelletizing; burdening is conducted, specifically, the pelletizing, the chrome fine ore with the granularity being larger than 6 mm, flux and reducing agent are evenly mixed, and then mixture is obtained; and smelting is conducted, specifically, the mixture is placed into a submerged arc furnace to conduct smelting.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a high-carbon ferrochromium and a preparation method thereof. Background technique [0002] Chromium ore can be divided into two types according to particle size, namely chrome lump ore and chrome powder ore. Among them, fusible chromium powder ore has the following characteristics: small particle size, 90% of which are smaller than 10mm, and Cr in the ore 2 o 3 The content of Al is more than 40%. 2 o 3 The sum of the content of MgO and MgO is less than 30%. This type of chromium powder ore is easy to melt during smelting, and the primary slag is formed at a faster rate, which easily causes unreduced powder ore particles to quickly enter the slag layer, and more chromium escapes from the slag. [0003] When the submerged arc furnace smelts fusible chromium powder ore, if the ingredients are not properly prepared, the following problems will occur: the load of the submerged arc furn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B4/06
CPCC22B1/242C22B1/2406C22B4/06
Inventor 于洪翔
Owner BERIS ENG & RES CORP
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