Properties of boron-rich slag separated from boron-bearing iron concentrate

In the present paper,the fundamental research on the properties of boron-rich slag melting separated from boron-bearing iron concentrate was performed.The melting and fluidity of B2O3–MgO–SiO2–FeO slag system,crystallization of separated boron-rich slag and factors on the extraction efficiency of boron-rich slag were systematically investigated.B2O3 content would heavily affect the melting and fluidity property of boron-rich slag.Generally,FeO could improve the melting and fluidity property of boron-rich slag.Boron-containing crystalline phase mainly precipitated in temperature range from 1200°C to 1100°C.Higher smelting temperature and B2O3 reduction ratio were negative for the extraction of boron.The cooling rate of 10–20°C/min was better for the crystallization of boron-containing crystalline phase.Based on the obtained experimental results,the optimum operating parameters for the development of pyrometallurgical boron and iron separation process and further boron-rich slag cooling process were proposed.

高炉炉况失常的原因分析

1 事故经过1999年11月15日,由于停水导致高炉无计划休风465分钟。复风后,高炉操作者为此采取了改变装料制度、额外加焦、降低焦炭负荷等措施,使得第一次和第二次铁的铁温较适宜,渣铁流动性较好。当运行一个半周期后,两座高炉出现了顽固性悬料,炉顶温度急剧攀升。放散阀打开后,煤气出现着火和爆炸等现象,风口呆滞,且有挂渣现象出现。