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Method for preparing low-silicon superhigh-alkalinity sintered ore

A sintering and ultra-high technology, applied in the field of iron and steel metallurgy, can solve the problems of declining yield and low content, and achieve the effects of increasing strength and yield, strengthening the sintering process, improving the mineralization degree of flux and fuel combustion efficiency

Inactive Publication Date: 2008-05-14
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 used and other steps and parameters are consistent with the existing method; the material layer is increased to 700mm; the material pressure is reduced 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 sinter drum strength (it is the ISO drum strength defined in GB13242, refers to 7.5 kg of 40~10mm sinter after 200 revolutions in the ISO drum machine,> 6.3mm particles The percentage of grade sinter to the weight of the entire sinter is an important indicator to measure the strength of the sinter. The higher the strength, the better the strength of the sinter.) Increase from 72% to 73.09%-73.86%, an increase of 1.09%-1.86%; finished product; The rate increased from 71% to 72.27% to 72.93%, and 1.27% to 1.93%; the output increased from 1.204t / m 2 .h, increased to 1.236~1.240t / m 2 .h, an increase of 2.7% to 3.05%...

Embodiment 2

[0025] The raw materials and other steps and parameters used are the same as the existing methods; increase the material layer during cloth to 750mm; then press the material and laminate the material to 30mm; extend the ignition time to 2.5 minutes; increase the ignition temperature to 1100°C to prepare sintering mine.

[0026] The results show that, compared with the existing method, the strength of the sinter drum is increased from 72% to 73.96% to 74.72%, an increase of 1.96% to 2.72%; the yield rate is increased from 71% to 73.3% to 73.84%, an increase of 2.3% to 2.84%; output from 1.204t / m 2 .h, increased to 1.245~1.258t / m 2 .h, an increase of 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 calcium ferrite content of sintered ore increased by 5.9% to 6.3%.

Embodiment 3

[0028] The raw materials and other steps and parameters used are the same as the existing methods; increase the material layer during cloth to 750mm; then press the material and laminate the material down to 40mm; extend the ignition time to 2.5 minutes; increase the ignition temperature to 1100°C to prepare sintering mine.

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

[0030] The above examples show that the drum strength of the sinter is increased by 1.09% to 4.25%, the yield is increase...

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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 preparation method of low-silicon ultra-high basicity sintered ore. Background technique [0002] Most of the iron ore in my country is lean ore. It is not cost-effective to feed lean ore directly into the furnace for iron smelting. Therefore, it is necessary to crush the lean ore, select high-grade concentrate, and then agglomerate the fine ore powder into artificial Only rich ore can be smelted in a blast furnace. Therefore, agglomeration of fine ore is an indispensable control link for the full and reasonable utilization of lean ore. In the mining process of rich ore, fine ore is produced. In order to meet the particle size requirements of the blast furnace, fine ore will also be produced during the crushing process. The direct entry of fine ore into the furnace will cause the blast furnace to be unsuccessful. Deteriorating the technical and economic...

Claims

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Application Information

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Patent Type & Authority Applications(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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