MgO/Al_(2)O_(3)质量比对褐铁矿型红土镍矿烧结成矿行为的影响  

Effect of MgO/Al_(2)O_(3) Mass Ratio on Mineralization Behavior of Limonitic Laterite Ore During Sintering

作　　者：候三亚 黄家豪 张豆 陈靖 胡前盛 罗骏[1] 饶明军[1] HOU Sanya;HUANG Jiahao;Zhang Dou;CHEN Jing;HU Qiansheng;LUO Jun;RAO Mingjun(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China;Guangdong Guangqing Metal Technology Co.Ltd.,Yangjiang 529500,Guangdong,China)

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]广东广青金属科技有限公司,广东阳江529500

出　　处：《矿产保护与利用》2023年第1期140-147,共8页Conservation and Utilization of Mineral Resources

基　　金：中南大学研究生创新项目资助(1053320215529)。

摘　　要：为了提高红土镍矿烧结矿的产质量指标,基于热力学分析,查明了MgO/Al_(2)O_(3)质量比对高温烧结过程液相量及其黏度的影响;再通过微型烧结试验探讨了镁/铝质量比对烧结矿的物相组成、黏结相强度的影响,阐明其对褐铁矿型红土镍矿烧结成矿行为的影响;最后通过烧结杯烧结扩大试验进行了有效性验证。微型烧结试验结果表明,在烧结温度为1 300℃、烧结气氛为5%CO+95%N_(2)、二元碱度m(CaO)/m(SiO_(2))=1.3的条件下,m(MgO)/m(Al_(2)O_(3))=0.5~0.8范围内,黏结相主要由钙镁黄长石和钙镁橄榄石构成,强度超过4 000N/个。烧结杯验证试验表明,镁/铝质量比由0.5提高至0.7时,烧结矿的成品率无明显变化保持在70%左右,但是其转鼓强度由49.73%提高至56.67%,烧结矿的转鼓强度得到有效改善,适宜的镁/铝质量比为0.6~0.7。To improve the production and quality indices of laterite ore sinter,the effect of MgO/Al_(2)O_(3) mass ratio on the liquid volume and viscosity during high-temperature sintering was investigated,based on thermodynamic analysis.The influence of MgO/Al_(2)O_(3) ratio on the phase composition and bonding phase strength of sinter was discussed through micro-sintering test,and the impact of MgO/Al_(2)O_(3) mass ratio on sintering mineralization behavior of limonitic laterite ore was clarified.Finally,the validity of our findings was confirmed through sinter-pot large-scale sintering test.The results of micro-sintering test showed that the bond phase was mainly composed of calc-magnesia melilite and olivine and their compressive strength exceeded 4000 N/P,under the condition of m(MgO)/m(Al_(2)O_(3))=0.5~0.8,sintering temperature of 1300℃,sintering atmosphere of 5%CO+95%N_(2),binary basicity of m(CaO)/m(SiO_(2))=1.3.The sinter-pot verification test revealed that increasing the MgO/Al_(2)O_(3) mass ratio from 0.5 to 0.7,the yield of sinter did not change significantly and remained at approximately 70%,but its tumbling strength of sinter increased from 49.73%to 56.67%,and the optimal MgO/Al_(2)O_(3) mass ratio was in the range of 0.6-0.7.

关 键 词：红土镍矿 烧结成矿 MgO/Al_(2)O_(3) 黏结相 

分 类 号：TF815[冶金工程—有色金属冶金] TF046