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对硫酸渣直接还原过程中脱硫剂的种类与用量、焙烧温度、不同升温方式、焙烧时间等因素对焙烧过程的影响进行了研究。确定的最佳工艺条件为:还原剂用量为30%,脱硫剂SH用量为15%,随炉升温,焙烧温度为1 200℃,焙烧时间为60 min。在此条件下可得到铁品位为90.13%、铁回收率为95.06%、硫含量为0.040%的还原铁。X射线衍射和扫描电镜分析结果表明,硫酸渣中的硫与脱硫剂反应生成了硫化钙,且焙烧温度的升高和随炉升温都有利于硫化钙的生成;通过磨矿-磁选方法可将硫化钙与金属铁分离,从而达到脱硫目标。
The influence of the types and amount of desulfurizer, calcination temperature, different heating methods, calcination time and other factors on the calcination process was studied in the process of direct reduction of sulfuric acid slag. The optimal process conditions were determined as follows: the amount of reducing agent was 30%, the amount of desulfurization agent SH was 15%, the temperature of calcination was 1200 ℃ and the calcination time was 60 min. In this condition, the reduced iron with the grade of 90.13% Fe, the iron recovery 95.06% and the sulfur content 0.040% can be obtained. The results of X-ray diffraction and scanning electron microscopy showed that the sulfur in the sulfuric acid slag reacted with the desulfurizing agent to produce calcium sulfide, and the calcination temperature and the temperature rising were favorable for the formation of calcium sulfide. The grinding-magnetic separation method The calcium sulfide and metal iron separation, so as to achieve the goal of desulfurization.