Sintering process for ferrochromium fine powder ore pellets

A technology of ferrochrome and fine powder, which is applied in the field of pellet sintering technology of ferrochrome fine powder ore, can solve the problems of high sintering temperature of chromium powder ore, poor sinter strength and poor air permeability, and achieve low pulverization rate of finished products, sintering Efficiency improvement, good air permeability effect

Inactive Publication Date: 2015-07-01
JILIN MECHANICAL & ELECTRICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the conventional sintering method requires high sintering temperature, high energ

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Main raw material: South African Tharisa ferrochrome fine ore, the fine ore larger than 1mm does not exceed 5%, and the main chemical composition is Cr 2 o 3 : 40~50wt%, Fe: 25~31wt%, MgO: 8~10wt%, SiO 2 : 2.7~3.3 wt%, Al 2 o 3 : 14~17wt%;

[0029] Coke: particle size 1mm-3mm, adding amount is 6.5%. Proceed as follows:

[0030] 1) Use a ball mill to carry out ball milling of ferrochrome fine powder ore. After ball milling, the particles of ore powder less than 200 mesh account for 85%-95% of the mass, and the remaining particles of ore powder are less than 100 mesh. The screening method is as follows:;

[0031] a) Screening the ferrochrome fine powder ore that has been ball-milled by a ball mill is first screened with a 100-mesh sieve, and the ferrochrome fine powder ore on the sieve is ball-milled again with a ball mill until the ferrochrome fine powder ore particles completely pass through the 100-mesh sieve sieve;

[0032] b) The ferrochrome fine ore particles...

Embodiment 2

[0046] Embodiment 2, present embodiment and embodiment 1 adopt identical main raw material and coke, difference is: coke addition is 7.0%, and step is as follows,

[0047] Step 1) to step 6) are the same as in Example 1;

[0048] 7) In the sintering machine, use the method of distributing the lower large ball and the upper small ball. First, lay the bottom material 50mm, then spread the large ball 370mm prepared in step 6), and finally spread the small ball 100mm prepared in step 6). The total thickness is 520mm. The particle diameter of the large ball is 8mm-10mm, and the particle diameter of the small ball is 5mm-8mm;

[0049] 8) Bake and preheat the sintering cup with petroleum gas before sintering. The preheating temperature reaches 150°C for sintering. The ignition temperature of draft sintering is 1025°C. The temperature is 1325°C, the sintering time is 40min, the sintering negative pressure is 7000Pa, and the finished product rate is 90%.

[0050] After s...

Embodiment 3

[0052] Embodiment 3, the present embodiment and the present embodiment and embodiment 1 adopt the same main raw material and coke, the difference is that: the coke addition is 7.5%, and the steps are as follows,

[0053] Step 1) to step 6) are the same as in Example 1;

[0054] 7) In the sintering machine, use the method of distributing the lower large ball and the upper small ball. First, lay the bottom material 50mm, then spread the large ball 400mm prepared in step 6), and finally lay the small ball 100mm prepared in step 6). The total thickness is 550mm. The particle diameter of the large ball is 8mm-10mm, and the particle diameter of the small ball is 5mm-8mm;

[0055] 8) Bake and preheat the sintering cup with petroleum gas before sintering. The preheating temperature reaches 150°C for sintering. The ignition temperature for ventilation sintering is 1050°C. The temperature is 1350℃, the sintering time is 45min, the sintering negative pressure is 8000Pa, and the...

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Abstract

The invention discloses a sintering process for ferrochromium fine powder ore pellets. The sintering process is characterized by comprising the following steps: 1) carrying out ball-milling on ferrochromium fine powder ores by a ball mill; 2) screening cokes; 3) screening bentonite; 4) carrying out internal carbon distribution on the ferrochromium fine powder ores prepared in the step 1); 5) manufacturing green pellets in a first drum; 6) carrying out external carbon distribition on the green pellets prepared in the step 5) in a second drum, thus obtaining carbon proportioning green pellets; 7) carrying out material distribution in a sintering machine in a material distribution manner of distributing large pellets at the top and distributing small pellets at the bottom; 8) roasting and preheating a sintering cup by petroleum gas before sintering, and then carrying out draft sintering.

Description

technical field [0001] The invention belongs to the field of ferroalloy smelting, relates to a raw material treatment process before smelting ferrochrome fine powder ore, and is a pellet sintering process of ferrochrome fine powder ore. Background technique [0002] The key to ferrochromium smelting lies in the agglomeration of chrome powder ore. During the smelting process of submerged arc furnace, direct feeding of fine ore into the furnace will not only cause a large amount of useful elements to be lost with slag and furnace gas, increase the power consumption of smelting, but also reduce the Poor air permeability directly threatens the operation safety of submerged arc furnace. Lump ore in chrome ore resources only accounts for about 20% of the total, and the remaining 80% is fine ore. In addition, a considerable part of chromium ore is a friable ore, which is extremely fragile during mining and storage, and even high-strength lump ore produces a large amount of...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B1/16
CPCC22B1/00C22B1/16
Inventor 王海娟杨景军贾强
Owner JILIN MECHANICAL & ELECTRICAL EQUIP
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