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Method for preparing sintered ore

A sinter and binder technology, applied in the field of metallurgy, can solve the problems of increasing fuel consumption, affecting the output and quality of sinter, achieving reasonable particle size composition, improving mineral composition and structure, metallurgical performance, and good application prospects

Inactive Publication Date: 2011-05-04
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

[0003] The technical problem to be solved by the present invention is that because the particle size of coke powder is too small, it affects the output and quality of sintered ore and increases fuel consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 Use the method of the present invention to carry out sintering

[0018] Other steps and parameters are consistent with the existing method, except that the coke powder after crushing is mixed with polyvinyl alcohol (produced by Chengdu Chemical Reagent Factory) of one hundred thousandth of the weight of the coke powder, and it is prepared as 0.1% to 0.2% The solution is then dosed. The sintering results show that compared with the existing method of sintering without using binder, the coke powder -0.5mm fine particle size is reduced by 10-12.3%, and the drum strength of sintered ore (is the ISO drum strength defined according to GB13242, refers to After taking 7.5 kg of sintered ore with a size of 40-10 mm and rotating it in the ISO drum machine for 200 revolutions, the percentage of sintered ore with a particle size of >6.3 mm in the weight of the entire sintered ore is an important index to measure the strength of the sintered ore. The better the strengt...

Embodiment 2

[0019] Example 2 Sintering using the method of the present invention

[0020] Other steps and parameters are consistent with the existing method, except that the coke powder after crushing is mixed with polyvinyl alcohol (produced by Chengdu Chemical Reagent Factory) of 2 / 100,000 of the weight of the coke powder, and it is prepared to be 0.21% to 0.3% The solution is then dosed. The sintering results show that, compared with the existing method of sintering without using a binder, the coke powder -0.5mm fine particle size is reduced by 12.2% to 15.3%, the strength of the sinter drum is increased by 1.23% to 1.41%, and the yield is increased by 1.81% % to 2.15%, the output increased by 3.10% to 3.79%, and the low-temperature reduction pulverization rate of sintered ore decreased by 1.43% to 2.67%.

Embodiment 3

[0021] Example 3 Sintering using the method of the present invention

[0022] The other steps and parameters are consistent with the existing method, except that the crushed coke powder is mixed with 3 / 100,000 polyvinyl alcohol (produced by Chengdu Chemical Reagent Factory) of the coke powder weight, and the concentration is 0.32%~0.4% binder ( Type A composite binder was used). technical method. The sintering results show that, compared with the existing method of sintering without using a binder, the coke powder -0.5mm fine particle size is reduced by 15.2% to 21%, the strength of the sinter drum is increased by 1.53% to 1.62%, and the yield is increased by 2.30% % to 3.26%, the output increased by 3.82% to 5.4%, and the low-temperature reduction pulverization rate of sintered ore decreased by 2.85% to 4.02%.

[0023] It can be seen from the above examples that after adopting the method of the present invention, the proportion of coke powder-0.5mm fine-grained grade is red...

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PUM

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Abstract

The invention pertains to the metallurgy technical field, in particular to a method of a sintered ore, which aims at solving the technical problem that sintered coke powder is easy to be over crushed, resulting in the proportion of -0.5mm granule being over high and then influencing the sintered effect. The method comprises the steps of crushing the coke powder, making balls with burden and mixture, burden distribution sinter, etc. The invention is characterized in that the coke powder after being crushed is added with adhesive to make the granule and then make the balls with the burden and the mixture. Since the method of the invention is adopted, the coke powder -0.5 mm granule proportion is decreased by 10 percent -21 percent, thus improving the sintered process; the calcium ferrite content in the sintered ore is increased by over 2 percent, the drum strength in the sintered ore is improved by 1.0 percent-1.62 percent, the rate of finished products is improved by 1.35 percent-3.26 percent, the yield is increased by 2.7 percent-5.4 percent, and the metallurgical property of the sintered ore is also promoted. The technology is simple and practicable, and the on-site technology process can be conveniently modified with strong feasibility.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing sintered ore. Background technique [0002] Coke powder is the coke particles of <10mm produced during the crushing process of coke used in ironmaking blast furnaces, and then crushed into fine powder of 3-0mm, which is generally used as fuel for sintering. At present, the coke powder used for sintering generally requires the particle size to be controlled at 3-0mm, and the particle size of <0.5mm should not be more than 28%. Too high (above 40%) problem. During sintering, the coke powder is directly added to the mixture, so the content of -0.5mm fine-grained coke powder does not change. Due to the extremely fast combustion speed of -0.5mm fine-grained coke powder, the heat generated by combustion is difficult to make the sintered material reach the required high temperature, which seriously affects the output and quality of sintered ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/14C22B1/244
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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