SiO_2对镁质酸性球团性能的影响
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摘要
为了改善镁质酸性球团矿质量,以唐钢提供的矿粉为原料,通过改变矿粉1、矿粉2的配比,调整SiO_2含量,研究SiO_2对镁质酸性球团性能的影响。结果表明:随着SiO_2含量的升高,矿粉1配比逐渐较少,矿粉2和高镁粉配比逐渐增加,成球率、生球强度变化不大,生球爆裂温度由638℃逐渐降低,并在SiO2的质量分数为6.5%时达到570℃,然后趋于平缓;球团抗压强度整体呈现下降的趋势,变化范围为2 853~2 377N/个,SiO_2质量分数每提高0.1%,抗压强度降低22.72N/个;软化开始温度呈下降的趋势,软化区间变化不大,维持在31~42℃;赤铁矿晶粒不易长大,晶键有变细的趋势且有明显的石英和玻璃质出现,导致球团矿性能变差。
In order to improve the quality of magnesian acid pellets,the Tangsteel ore was chosen as raw materials and SiO_2 content was adjusted by changing the ratio of iron ore 1 and iron ore 2.The effect of SiO_2 content on the quality of magnesian acid pellets was analyzed.The results show that with the increase of SiO_2 content,iron ore 1 ratio gradually decreases,while iron ore 2 and high magnesium ratios increase gradually;ball rate,the pelletizing ratio and the strength of green pellets are affected slightly.The decrepitation temperature of green pellets decreases from 638℃to 570℃ when the SiO_2 content is 6.5 mass%.Then the decline rate becomes slow.Generally,compressive strength of pellets decreases,changing in the range of 2 853-2 377 N.When SiO_2 content increases by 0.1 mass%,compressive strength decreases by 22.72 N.Softening start temperature decreases while the softening range is effected slightly,maintaining at 31-42℃.Hematite grain is difficult to grow up,and grain bonds tend to be finer;quartz and glass appear obviously,resulting in poor pellet performance.
In order to improve the quality of magnesian acid pellets,the Tangsteel ore was chosen as raw materials and SiO_2 content was adjusted by changing the ratio of iron ore 1 and iron ore 2.The effect of SiO_2 content on the quality of magnesian acid pellets was analyzed.The results show that with the increase of SiO_2 content,iron ore 1 ratio gradually decreases,while iron ore 2 and high magnesium ratios increase gradually;ball rate,the pelletizing ratio and the strength of green pellets are affected slightly.The decrepitation temperature of green pellets decreases from 638℃to 570℃ when the SiO_2 content is 6.5 mass%.Then the decline rate becomes slow.Generally,compressive strength of pellets decreases,changing in the range of 2 853-2 377 N.When SiO_2 content increases by 0.1 mass%,compressive strength decreases by 22.72 N.Softening start temperature decreases while the softening range is effected slightly,maintaining at 31-42℃.Hematite grain is difficult to grow up,and grain bonds tend to be finer;quartz and glass appear obviously,resulting in poor pellet performance.
引文
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[5]王艳,杨柳,柴勇,等.球团生产使用含铁粘结剂替代膨润土的实验研究[J].中国科技投资,2016(6):152.(Wang Y,Yang L,Chai Y,et al.Study on the substitution of iron containing binder for bentonite in pellet production[J].China Venture Capital,2016(6):152.)
[6]侯静,吴恩辉,李军,等.钒钛铁精矿生球的爆裂性能研究[J].烧结球团,2014,39(1):25.(Hou J,Wu E H,Li J,et al.Study on rupture performance of green pellets of V-Ti-bearing iron ore concentrate[J].Sintering and Pelletizing,2014,39(1):25.)
[7]王代军.巴西赤铁精矿成球性能试验[J].金属矿山,2014,2014(1):50.(Wang D J.Pelletizing properties of hematite concentrate from Brazil[J].Metal Mine,2014,2014(1):50.)
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[12]青格勒,王朝东,侯恩俭,等.低硅含镁球团矿抗压强度及冶金性能[J].钢铁研究学报,2014,26(4):7.(Qing G L,Wang C D,Hou E J,et al.Compressive strength and metallurgical property of low silicon magnesium pellet[J].Journal of Iron and Steel Research,2014,26(4):7.)