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A powerful mixing-granulation method for strengthening the sintering of high-proportion fine-grained raw materials

A fine-grained, high-proportion technology, applied in the field of iron and steel metallurgy, can solve the problems affecting the output of sintered ore, quality indicators, mixing, and difficulty in granulation, so as to improve the granulation effect, achieve efficient utilization, and reduce ineffective water. Effect

Active Publication Date: 2021-01-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems in the prior art of using high-proportion fine-grained materials (iron concentrate, iron-containing dust) to organize sintering production, it is difficult to mix and granulate, thereby affecting the output and quality indicators of sintered ore. The main purpose of the present invention is to Provide a method to effectively improve the mixing and granulation effect of fine-grained materials. By optimizing the mixing and granulation process and regulating the wetting mode of the material in the mixing and granulation process, the mixing and granulation effect can be improved and the high proportion can be strengthened. The purpose of sintering fine particle raw materials

Method used

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  • A powerful mixing-granulation method for strengthening the sintering of high-proportion fine-grained raw materials
  • A powerful mixing-granulation method for strengthening the sintering of high-proportion fine-grained raw materials

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Effect test

Embodiment 1

[0042] Weigh iron concentrate, iron ore powder, iron-containing dust, coke powder, quicklime, limestone, dolomite, fine-grained returned ore (particle size≤3mm), and coarse-grained returned ore (granularity>3mm), according to mass percentage, As shown in Table 1, the relative proportions of iron concentrate, iron ore powder, and iron-containing dust are shown in Table 2. Mix iron concentrate, iron ore powder, fuel, flux, and fine-grained return ore through the first cylinder, and spray water accounting for 50% of the total added water mass percentage, and the particle size of water droplets is controlled at 0.3-0.5mm ; Spray 1.5% sodium carboxymethyl cellulose solution in the iron-containing dust, the concentration is controlled at 0.2%, and the particle size of the atomized liquid beads is 0.1-0.15mm, and then it is mixed with the cylinder The mixed materials are sent to a strong mixer together, and water is sprayed to account for 20% of the total added water mass percentage,...

Embodiment 2

[0044] Iron concentrate, iron ore powder, iron-containing dust, coke powder, quicklime, limestone, dolomite, fine-grained and coarse-grained returned ore were weighed according to mass percentage, as shown in Table 1, where iron concentrate, iron The relative ratio of ore powder and iron-containing dust is shown in Table 2. Mix iron concentrate, iron ore powder, fuel, flux, and fine-grained return ore through the first cylinder, and spray water accounting for 50% of the total added water mass percentage, and the particle size of water droplets is controlled at 0.3-0.5mm ; Spraying 2.0% sodium carboxymethyl cellulose solution in the iron-containing dust, the concentration is controlled at 0.3%, and the particle size of the atomized liquid beads is 0.05-0.10mm, and then it is mixed with the cylinder The mixed materials are sent to a strong mixer together, and water is sprayed to account for 20% of the total added water mass percentage, and the water droplet size range is control...

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Abstract

The invention discloses a powerful uniform mixing-granulating method for strengthening the sintering of high-proportion micro-fine particle raw materials. The method comprises the steps of performingfirst-stage mixing of materials I including iron ore concentrate, iron ore powder, fine fraction return ore and the like through a cylinder mixer to obtain a first-stage mixed material; carrying out second-stage mixing on the first-stage mixed material and an iron-containing dust material II treated by a binder solution through a powerful mixer to obtain a second-stage mixed material; granulatingthe second-stage mixed material and a humidified coarse-fraction return mineral material III through the cylinder mixer. According to the method, the moisture adding proportion in the three stages ofmixing and granulating and the particle size range of sprayed water drops are regulated and controlled, so that the dispersion uniformity of different materials is enhanced, the bonding performance between fine material particles and between the fine material particles and surfaces of other materials is improved, the granulating effect can be effectively improved, and the sintering of the high-proportion fine materials is enhanced.

Description

technical field [0001] The invention relates to a method for granulating fine-grained raw materials, in particular to a powerful mixing-granulating method for strengthening the sintering of high-proportion fine-grained raw materials, which belongs to the sintering industry in the field of iron and steel metallurgy. Background technique [0002] my country's crude steel output continues to rank first in the world, and in 2018 the crude steel output exceeded 900 million tons. Huge steel production consumes a larger amount of iron ore. Due to the shortage of high-quality iron ore resources in my country, in order to meet the needs of steel production, a high proportion of iron ore has been imported from Australia, Brazil, South Africa and other regions for a long time to organize production. For iron and steel enterprises in coastal and river ports, due to lower transportation costs, they can use a large number of imported ore, while for iron and steel enterprises in inland ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/244
CPCC22B1/2406C22B1/244
Inventor 范晓慧季志云甘敏李强吴明黄斌斌张一雄陈许玲黄晓贤袁礼顺武钰丰
Owner CENT SOUTH UNIV
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