Effect of MgO Content on Metallurgical Properties of Acid Pellets
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摘要: 球团矿中适宜的MgO含量能改善其冶金性能,有利于高炉的冶炼,因此,在球团矿中寻求适宜的MgO含量至关重要。试验采用研山三系列铁精粉、白云石粉及高镁粉混合造球,配以铁矿石冶金性能综合测试仪、XRD和金相显微镜等测试手段,探究MgO含量对酸性球团矿冶金性能的影响规律。结果表明:随着MgO含量的增加,酸性球团矿的低温还原粉化和还原性得到改善;酸性球团矿的抗压强度在MgO含量为2.0%时最好,可达到3 050 N;当MgO含量在1.8~2.0%时,球团矿的矿物组成较好,铁酸钙含量较多,赤铁矿结晶较完善。Abstract: Appropriate MgO content in pellets can improve their metallurgical properties and is beneficial to blast furnace smelting.Therefore,it is very important to determine suitable MgO content in pellets.In this experiment,Yanshan No.3 type of iron concentrate powder,dolomite powder and high magnesium powder were mixed to make pellets.The influence of MgO content on the metallurgical properties of acidic pellets was investigated by means of comprehensive tester for metallurgical properties of iron ore,XRD and metallographic microscope.The results show that with the increase of MgO content,the low temperature reduction pulverization and reducibility of acid pellets are improved.The best compressive strength of acid pellets can be achieved when MgO content is 2.0%,reaching 3 050 N.When MgO content is in the range of 1.8%~2.0%,the better mineral composition of pellets is obtained with morecalcium ferrite content and better crystallization of hematite.
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Key words:
- acidic pellets /
- MgO /
- microstructure /
- metallurgical properties
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