含硼铁精矿熔分富硼渣基础特性研究

摘要

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 ℃ to 1100 ℃.Higher smelting temperature and B2O3 reduction ratio were negative for the extraction of boron.The cooling rate of 10-20 ℃/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.%本文针对含硼铁精矿熔分所得富硼渣的基础特性进行了基础研究,具体包括:B2O3-MgO-SiO2-FeO渣系的熔化和流动特性、熔分富硼渣的结晶行为和不同因素对富硼渣浸出率的影响.B2O3含量对富硼渣的熔化和流动特性有显著影响.总体上,FeO可以提高富硼渣的熔化和流动性;缓冷过程中含硼晶相主要在1200℃-1100℃这一温度区间析出;过高的熔炼温度和B2O3还原率对富硼渣中硼的提取不利;适宜的富硼渣缓冷速率为10℃/min-20℃/min.基于上述试验结果,可以为硼铁精矿中硼-铁火法分离及后续富硼渣缓冷工艺的开发提供优化参数.