Sintering technology for acidic pellet ore and alkaline material mixed ultra-thick material layer

A technology of mixed sintering and pelletizing, which is applied in the sintering field of iron and steel enterprises, can solve the problems of increased cost of blast furnace smelting, high enterprise investment, and reduced sintering speed, and achieve the effects of improving the quality of sintered ore, enhancing the oxidation atmosphere, and improving air permeability

Inactive Publication Date: 2015-09-09
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0003] With the continuous increase of my country's steel production and the subsequent shortage of raw materials, some problems have also appeared in the existing raw material production processes and technologies: 1) With the increase of sinter grade and SiO 2 2) The amount of lump ore that meets the requirements of blast furnace smelting in acidic ore cannot meet the requirements, and the acidic material of blast furnace is mainly pelletized ore
Pellets have strict requirements on raw materials and high processing costs, which increase the cost of blast furnace smelting; 3) Acid ore and high-basic sintered ore are loaded into the blast furnace separately, which makes the assimilation process of the charge in the blast furnace slow, which is not conducive to the enhanced smelting and cost of the blast furnace 4) The output of the sintering machine is high, the requirements for raw materials are relatively broad, and the cost is low, but the energy consumption is high and the pollution is serious; 5) Sintering and pelletizing have their own advantages, but the mineralization mechanism and roasting process are different. Large enterprises generally have sintering 1. Two sets of technological processes for pelletizing, resulting in high investment, large land occupation, difficulties in production organization, and high production costs; 6) Thick material layer sintering is an effective means to increase the output of sintering machines, reduce costs and reduce pollution
However, sintered materials of the same nature have the same melting properties. As the thickness of the material layer increases, the heat storage is strengthened. The heat in the lower part of the material layer is excessive. decline
Therefore, the current sintering process is difficult to achieve ultra-thick material layer (≥1000mm) sintering

Method used

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  • Sintering technology for acidic pellet ore and alkaline material mixed ultra-thick material layer
  • Sintering technology for acidic pellet ore and alkaline material mixed ultra-thick material layer
  • Sintering technology for acidic pellet ore and alkaline material mixed ultra-thick material layer

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specific Embodiment 1

[0071] According to the requirements of pellet production, fully mix the vanadium-containing fine powder and bentonite according to the ratio of 95:5, and the content of the vanadium-containing fine powder with a particle size less than 0.074mm is greater than 70%, and the upper limit of the particle size does not exceed 0.2mm. After mixing Use a disc pelletizer to add water to make pellets, and divide the pellets into four grades of 5-8mm, 8-10mm, 10-12.5mm and >12.5mm; Flour, returned ore, lime and coke powder are mixed with water according to the ratio of 28:22:20:17:7:6, and the water content is about 6%, and then the mixed materials are added to the cylinder granulation Carry out secondary mixing in the machine, add water during the mixing process, the water content of the alkaline mixed material after adding water is about 7.5%; weigh 42kg of alkaline mixed material, 5.6kg of 5-8mm pellets, 8-10mm pellets 7kg of pellets, 12.6kg of 10-2.5mm pellets, and 2.8kg of >12.5mm p...

specific Embodiment 2

[0078] According to the requirements of pellet production, fully mix the vanadium-containing fine powder and bentonite according to the ratio of 95:5, and the content of the vanadium-containing fine powder with a particle size less than 0.074mm is greater than 70%, and the upper limit of the particle size does not exceed 0.2mm. After mixing Use a disc pelletizer to add water to make pellets, and divide the pellets into four grades of 5-8mm, 8-10mm, 10-12.5mm and >12.5mm; Flour, returned ore, lime and coke powder are mixed with water according to the ratio of 28:22:20:17:7:6, and the water content is about 6%, and then the mixed materials are added to the cylinder granulation Carry out secondary mixing in the machine, add water during the mixing process, the water content of the alkaline mixing material after adding water is about 7.5%; weigh 42kg of alkaline mixing material, 4.2kg of 5-8mm pellets, and 4.2kg of 8-10mm pellets 7kg of pellets, 11.2kg of 10-2.5mm pellets, and 5.6...

specific Embodiment 3

[0085] According to the requirements of pellet production, fully mix the vanadium-containing fine powder and bentonite according to the ratio of 95:5, and the content of the vanadium-containing fine powder with a particle size less than 0.074mm is greater than 70%, and the upper limit of the particle size does not exceed 0.2mm. After mixing Use a disc pelletizer to add water to make pellets, and divide the pellets into four grades of 5-8mm, 8-10mm, 10-12.5mm and >12.5mm; Flour, returned ore, lime and coke powder are mixed with water according to the ratio of 28:22:20:17:7:6, and the water content is about 6%, and then the mixed materials are added to the cylinder granulation Carry out secondary mixing in the machine, add water during the mixing process, the water content of the alkaline mixed material after adding water is about 7.5%; weigh 42kg of alkaline mixed material, 5.6kg of 5-8mm pellets, 8-10mm pellets 8.4kg of pellets, 11.2kg of 10-2.5mm pellets, 2.8kg of >12.5mm pel...

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Abstract

The invention provides a novel sintering technology for an acidic pellet and alkaline material mixed ultra-thick material layer. The sintering technology contains the following components: 3%-8% of an acidic pellet ore (green ball) with the particle size of 5-8 mm, 10%-15% of an acidic pellet ore (green ball) with the particle size of 8-10 mm, 15%-25% of an acidic pellet ore (green ball) with the particle size of 10-12.5 mm, 2%-5% of an acidic pellet ore (green ball) with the particle size of greater than 12.5 mm, and 50%-70% of an alkaline material (according to the weight percentage). On one hand, the air permeability of a sintered material layer can be improved, the oxidizing atmosphere is strengthened, the thickness of the sintered material layer is increased, and the purposes of improving production and quality and saving energy are achieved; and on the other hand, heat in the sintering process can be fully utilized, a sintered ore with suitable basicity is produced, the production process is shortened, and the production economic benefit is increased. Therefore, the novel acid and alkali mixed ultra-thick material layer sintering technology can be speculated to be capable of improving the air permeability of the material layer, thickening the sintered material layer, strengthening the oxidizing atmosphere and effectively improving the utilization coefficient of a sintering machine, so as to allow sintering production to achieve the purposes of saving energy consumption and improving the sintering quality.

Description

technical field [0001] The patent of the invention relates to a new technology for sintering a 1000mm ultra-thick material layer by mixing acidic pellets and high-alkalinity materials, and is especially suitable for the sintering field of iron and steel enterprises. Background technique [0002] In 2012, China's iron output reached more than 700 million tons, which will inevitably consume a large amount of iron-containing raw materials. At present, most of the blast furnaces in my country's iron and steel plants are mainly based on high-alkalinity sintered ore, and acid pellets and natural rich ore are added. Furnace charge structure. Therefore, improving the quality of the charge, saving energy and reducing consumption, and saving costs are the top priorities. [0003] With the continuous increase of my country's steel production and the subsequent shortage of raw materials, some problems have also appeared in the existing raw material production processes and technologies:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/18C22B1/243
Inventor 吕庆吴玮楠冯帅王瑞哲孙艳芹刘小杰万新宇
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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