炉渣成分对COREX铁水脱硫效果的影响

Analysis of chemical compositions of slag affecting desulphurization in hot metal of COREX process

COREX熔融还原炼铁工艺具有污染小、能耗低、对冶金焦的依赖性低等优点,但存在着铁水中硫质量分数高的问题。为了提高COREX-3000工艺的脱硫效果,针对炉渣中w(CaO)/w(SiO2)、w(MgO)及w(MgO)/w(Al2O3)等指标对脱硫效率的影响进行了研究和实践。通过渣铁耦合试验研究了炉渣成分对脱硫效率和渣铁间硫分配比的影响规律,优化调控炉渣成分并得到适宜的炉渣成分范围。比较两种碱性氧化物对脱硫效率的影响程度,应当优先调整炉渣二元碱度至1.20~1.35,随后是炉渣的MgO质量分数,同时还要兼顾w(MgO)/w(Al2O3),适宜的w(MgO)/w(Al2O3)为0.80~0.90。

The COREX process has many advantages,such as the less pollution,the lower energy consumption and the lower dependence on the metallurgical coke,while it still has the disadvantage of the high sulfur level in the hot metal.To improve the desulfurization efficiency in the COREX-3000 process,several aspects are studied and practiced.The work focuses on the effects of chemical compositions of slag,such as w(CaO)/w(SiO2)、w(MgO)and w(MgO)/w(Al2O3)on the desulfurization efficiency.The influences of chemical compositions of slag on the desulfurization efficiency and the sulfur distribution ratio are studied through experimental studies,and the optimal chemical compositions of the slag are listed.Comparing the effects of two kinds of basic oxides on the desulfurization efficiency,the binary basicity of slag should be preferentially adjusted within 1.20-1.35,and then w(MgO)of slag should be controlled.It is also necessary to take care of the appropriate w(MgO)/w(Al2 O3)at about 0.80-0.90.