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

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.