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Oxidation method for optimizing thermal parameters of concentrate pellets of fine-grained magnets

A technology of magnetite concentrate and thermal parameters, applied in furnaces, furnace types, rotary drum furnaces, etc., can solve the problems of excessively fine particle size of magnetite concentrate, low pellet strength, hindered oxidation, etc., to improve strength and quality, A wide range of adaptations, avoiding the effect of densification

Active Publication Date: 2020-04-17
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The grate-rotary kiln-ring cooler process still has the following problems in the treatment of fine-grained magnetite concentrate pellets: the magnetite concentrate is too fine, and the interaction between particles is strong, which makes the particles contact closely, and the pellets are easy to burn during the roasting process. The dense shell layer is formed, which leads to the obstruction of oxidation during the roasting process of the pellets, and the pellets present an unoxidized core-shell structure at the center, resulting in low strength of the pellets, which are easily broken and deteriorated in the subsequent transportation and smelting process

Method used

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  • Oxidation method for optimizing thermal parameters of concentrate pellets of fine-grained magnets
  • Oxidation method for optimizing thermal parameters of concentrate pellets of fine-grained magnets
  • Oxidation method for optimizing thermal parameters of concentrate pellets of fine-grained magnets

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Embodiment 1

[0041] The optimized thermal parameters are as follows: the air temperature in the preheating stage I is increased to 600°C, and the heating rate is increased to 100°C / min; the temperature in the preheating stage II is reduced to 920°C; The operation method is to increase the material layer height by 20%, and reduce the machine speed by 20%; the maximum roasting temperature of the rotary kiln is reduced to 1250°C, and the oxygen content of the roasting atmosphere is increased from 17% to 17.5%; the first section of the annular cooler reduces the air volume by 5%, and the environmental The outlet air temperature of the second section of the chiller is increased by 100°C; at this time, the oxidation ratio of the fine-grained magnetite concentrate pellets in the preheating section, roasting section, and cooling section is 50:30:20, which eliminates the shell structure of the pellets. The average strength of pellets increased to 2712N / piece, and the proportion of pellets below 2000...

Embodiment 2

[0043]The optimized thermal parameters are as follows: the air temperature in the preheating stage I is increased to 750°C, and the heating rate is increased to 150°C / min; the temperature in the preheating stage II is reduced to 880°C; The operation method is to increase the height of the material layer by 30%, and reduce the machine speed by 30%; the maximum roasting temperature of the rotary kiln is reduced to 1200°C, and the oxygen content of the roasting atmosphere is increased from 18% to 18.5%; the first section of the ring cooler reduces the air volume by 10%, and the ring The outlet air temperature of the second section of the chiller is increased by 150°C; at this time, the oxidation ratio of the fine-grained magnetite concentrate pellets in the preheating section, roasting section, and cooling section is 65:20:15, eliminating the shell structure of the pellets, The average strength of pellets increased to 2779N / piece, and the proportion of pellets below 2000N / piece de...

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Abstract

The invention relates to an oxidation method for optimizing thermal parameters of concentrate pellets of fine-grained magnets. A grate-kiln-ring cold machine system for producing iron ore pellets, a smoke circulation treatment system and operation parameters in the thermal process of producing pellets by adopting the systems are involved. The operation parameters in the thermal process comprise the air temperature (DEG C), the rate of temperature increase (DEG C / min), the height of a material layer (mm), the operation speed of a grate (m / min) and the oxygen content of a calcination atmosphere(%). The method is characterized in that when concentrate of the fine-grained magnets is used as a pellet raw material to prepare fresh pellets, by optimizing and regulating the thermal parameters ofproducing the pellets and controlling the oxidation ratio of the pellets of a pre-heating segment, a calcination segment and a cooling segment, the pellets can be deeply oxidized and efficiently solidified. The oxidation method has the advantages that the average compressive strength of the pellets is increased by 290 N / piece or above, and the quality of the pellets is improved. The thermal parameters only need to be optimized, and the method is suitable for industrial application and popularization.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgical pellet technology, and in particular relates to an oxidation method for optimizing thermal parameters of fine-grained magnetite concentrate pellets. Background technique [0002] my country's iron ore is mainly lean ore, and high-grade iron concentrate is mainly obtained through beneficiation and enrichment. The recovered iron concentrate has a fine particle size and is more suitable for preparation into pellets. Pellet ore has many advantages such as high iron grade, uniform particle size, and good strength. It can improve the technical and economic indicators of blast furnace smelting. . [0003] With the continuous expansion of the pellet size, the raw materials used in the pellets are also constantly changing, and people gradually begin to use the lean and fine iron ore that was difficult to use before. In order to make the grade of ore meet the requirements of ironmakin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/20C22B1/216C22B1/26
CPCC22B1/205C22B1/216C22B1/26
Inventor 朱德俊范晓慧陈许玲甘敏张海峰翁兴洋黄旭季志云
Owner ANSTEEL GRP MINING CO LTD
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