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A Fundamental Investigation on Magnetite Concentrate Oxidized Pellets

Author: LuoYanHong
Tutor: ZhuDeQing
School: Central South University
Course: Mineral Processing Engineering
Keywords: Magnetite concentrate Characteristics of raw materials Green pellet strength Balling performance High-temperature oxidation
CLC: TF046.6
Type: Master's thesis
Year: 2011
Downloads: 95
Quote: 0
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Abstract


With the rapid development of China 's iron and steel industry , the increasing shortage of domestic high-quality magnetite concentrate , iron ore concentrate plant complex in nature , resulting in poor performance of China 's iron ore concentrate into a ball problems have become increasingly prominent . How to take full advantage of the local iron ore resources , especially the higher grade of the effective use of local production for iron ore concentrate , iron and steel enterprises are facing a major issue . Therefore , in-depth study of the domestic production of magnetite concentrate raw material characteristics of the mechanism of iron ore concentrate into ball performance and roasting performance , and provide the theoretical basis to improve the the iron concentrate balling performance and high temperature oxidation behavior of the promotion of our pellets the industrial development of great significance . In this paper, the same kind of bentonite binder , six domestic iron ore concentrate as the research object , SEM, laser particle size analysis, means of determination of the specific surface area , the the wetting heat and the contact angle measurement , determination of the fractal dimension , TGA System iron ore concentrate inherent material properties, reveal the dynamics into a ball , green ball strength and high temperature oxidation roasting performance . Studies have shown that the characteristics of raw materials , the impact of the green ball falling strength of the main factors for hydrophilic and reasonable granularity of the material composition of D75 - 28 , and the compressive strength is mainly influenced by the specific surface area . Different mineral raw ball burst temperature is mainly affected by the material than the surface area of ??the green pellet strength and moisture . Dynamics study of iron ore concentrate into a ball , it is found that the iron ore concentrate dynamic capillary water migration rate largely depends on the material into ball rate . The magnetite concentrate into a ball rate and the average particle size and surface hydrophilic related . Static growth rate of 0.4-0.5 , green balls fastest, with the increase in the value of K into a ball of K values ??, into a ball rate declines , the green ball smaller and uniform particle size . Studies have shown that high-temperature oxidation behavior of iron ore concentrate : iron ore concentrate their oxidation rate is much larger than the oxidation rate of the magnetite oxide pellets , the rate of oxidation of magnetite concentrate its granularity and MgO content . Early oxidation of magnetite concentrate by chemical reaction control , the latter part of the hybrid control . The main influencing factors as raw materials in the same specific surface area of the different magnetite concentrate pellets Preheat the compressive strength of the fired pellet FeO and Si02 content and oxidation rate .

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CLC: > Industrial Technology > Metallurgical Industry > General issues > Smelting of raw materials and ore pretreatment > Ore pretreatment, sintered pellets > Pellets
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