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Method for preparing low-silicon superhigh-alkalinity sintered ore

A kind of sintering and ultra-high technology, which is applied in the field of iron and steel metallurgy, can solve the problems of low content and declining yield, and achieve the effect of strengthening the sintering process, increasing the strength and yield, and increasing the sintering temperature

Inactive Publication Date: 2010-01-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high sintering speed, SiO 2 Low content has adverse effects on the strength of sintered ore, especially the large drop in yield, and there is still a lot of room for improvement for the existing low-silicon ultra-high alkalinity sintering process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The raw materials and other steps and parameters used are consistent with the existing method; the material layer is increased to 700mm; the pressing material is pressed down by 20mm; the ignition time is extended to 2.0 minutes; the ignition temperature is increased to 1100°C to prepare sintered ore.

[0023] The results show that compared with the existing method, the strength of the sinter drum (ISO drum strength defined according to GB13242, refers to taking 7.5 kilograms of 40-10mm sintered ore and turning it in the ISO drum machine for 200 revolutions, and the grains >6.3mm The percentage of grade sinter in the weight of the whole sinter is an important index to measure the strength of the sinter, the higher the strength of the sinter, the better the strength of the sinter) increased from 72% to 73.09% to 73.86%, an increase of 1.09% to 1.86%; the finished product The rate increased from 71% to 72.27%-72.93%, an increase of 1.27%-1.93%; the output increased from 1....

Embodiment 2

[0025] The raw materials and other steps and parameters used are consistent with the existing method; the material layer is increased to 750mm when the fabric is placed; the material layer is pressed down by 30mm; the ignition time is extended to 2.5 minutes; the ignition temperature is increased to 1100°C for sintering mine.

[0026] The results show that compared with the existing method, the drum strength of sintered ore is increased from 72% to 73.96%-74.72%, an increase of 1.96%-2.72%; the yield is increased from 71% to 73.3%-73.84%, an increase of 2.3%- 2.84%; output from 1.204t / m 2 .h, increased to 1.245~1.258t / m 2 .h, increased by 3.37% to 4.51%; the low-temperature reduction pulverization rate of sintered ore decreased from 67.53% to 65.06% to 63.88%, a decrease of 2.47% to 3.65%; the content of calcium ferrite in sintered ore increased by 5.9% to 6.3%.

Embodiment 3

[0028] The raw materials used and other steps and parameters are consistent with the existing method; the material layer is increased to 750mm when the fabric is placed; the material layer is pressed down by 40mm; the ignition time is extended to 2.5 minutes; the ignition temperature is increased to 1100 ° C for sintering mine.

[0029] The results show that, compared with the base period, the strength of the sinter drum increased from 72% to 75.16% to 76.25%, an increase of 3.16% to 4.25%; the yield increased from 71% to 74.08% to 75.37%, an increase of 3.08% to 4.37% %; output from 1.204t / m 2 .h, increased to 1.262~1.274t / m 2 .h, increased by 4.81% to 5.8%; the pulverization rate of sinter low-temperature reduction decreased from 67.53% to 63.37% to 61.81%, a decrease of 4.16% to 5.72%. The calcium ferrite content of sintered ore increased by 6.5% to 7.0%.

[0030] The above examples show that after the sintering is prepared by the method of the present invention, the dru...

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Abstract

The invention pertains to the metallurgy technical field, in particular to a preparation method of an ultra-high alkalinity sintered ore with low silicon for improving the yield and the quality of the sintered ore and reducing the fuel consumption. The method of the invention comprises the steps that: a. the preparation of raw materials; b. burden distribution; c. sinter, etc. When in burden distribution of the step b, the bed depth is 700mm-750mm. The experiment result shows that calcium ferrite content in the sintered ore prepared by the method of the invention is increased by above 5 percent, the drum strength in the sintered ore is improved by 1.09-4.25 percent, the rate of finished products is improved by 1.27-4.37 percent, the yield is increased by 2.7 percent-5.8 percent, and the metallurgical property of the sintered ore is also promoted. The technology is simple and practicable, the existing raw materials and equipment can be utilized and the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for preparing low-silicon ultra-high alkalinity sintered ore. Background technique [0002] Most of the iron ore in our country is lean ore. It is uneconomical to put the lean ore directly into the furnace for ironmaking. Therefore, the lean ore must be crushed, and the high-grade concentrate must be selected, and then the concentrate powder is agglomerated into artificial Only rich ore can be smelted in the blast furnace. Therefore, agglomeration of fine ore is an indispensable control link for making full and rational use of lean ore. In the mining process of rich ore, fine ore will be produced. In order to meet the particle size requirements of the blast furnace, fine ore will also be produced during the crushing process. Directly feeding the fine ore into the furnace will cause the blast furnace to fail. Deteriorating the technical and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02
Inventor 甘勤何群文永才向绍红杜德志刘龙全杜炽
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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