An Oxidation Method for Optimizing Thermal Parameters of Fine Magnetite Concentrate Pellets

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: 2021-05-14
ANSTEEL GRP MINING CO LTD
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  • Abstract
  • Description
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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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  • An Oxidation Method for Optimizing Thermal Parameters of Fine Magnetite Concentrate Pellets
  • An Oxidation Method for Optimizing Thermal Parameters of Fine Magnetite Concentrate Pellets
  • An Oxidation Method for Optimizing Thermal Parameters of Fine Magnetite Concentrate Pellets

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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 fine-grained magnetite concentrate pellets, including a chain grate machine-rotary kiln-circular cooler system for iron ore pellet production, a flue gas circulation treatment system and the production of pellets The operating parameters of the thermal process, the operating parameters of the thermal process include: air temperature (°C), heating rate (°C / min), material layer height (mm), chain grate speed (m / min) and Oxygen content (%) in the roasting atmosphere; it is characterized in that, for green pellets prepared from fine-grained magnetite concentrate as pellet raw material, by optimizing and regulating the thermal parameters of pellet production, the preheating section, roasting section and cooling section are controlled By adjusting the oxidation ratio of pellets, deep oxidation and high-efficiency consolidation of pellets can be realized. The advantages of the invention are: 1) the average compressive strength of the pellets is increased by more than 290N / piece, and the quality is improved; 2) the invention only needs to optimize thermal parameters, and 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 Patents(China)
IPC IPC(8): C22B1/20C22B1/216C22B1/26
CPCC22B1/205C22B1/216C22B1/26
Inventor 朱德俊范晓慧刘文胜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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