电解锰压滤渣高温脱硫研究

采用直接煅烧法、还原法及添加脱硫剂煅烧法对电解锰压滤渣进行了高温脱硫,研究了不同方法得到的脱硫产物的物相、残硫量和活性,并比较了几种方法的工业适用性。结果表明:直接煅烧法的脱硫渣和坩埚粘连严重,实际操作困难;加入煤粉并没有改善脱硫渣和坩埚的粘连问题,且脱硫渣中残硫量高;石灰石虽能减弱脱硫渣和坩埚的粘连,但由于生成惰性物质石英,降低了脱硫渣的活性;采用铝矾土作为脱硫剂进行脱硫,脱硫渣的残硫量低,脱硫渣和坩埚不粘连,脱硫渣活性高。铝矾土添加量为42%(质量分数),脱硫温度为1 250 ℃,脱硫保温时间为5 min时,脱硫渣中硫含量为0.089 4%(质量分数),达到脱硫要求。

High Temperature Desulfurization of Electrolytic Manganese Filter Press Residue

The high temperature desulfurization of electrolytic manganese filter press residue was studied by direct calcination method,reduction method and calcination method with adding desulfurizer.The phase,residual sulfur content and activity of desulfurization products by different methods were studied,and the industrial applicability of several methods was compared.The results show that desulfurization slag by direct calcination method sticks seriously with crucible and it is difficult to operate in practice.The desulfurization slag by calcinations with adding coal still sticks with crucible,and contains high amount of residual sulfur.Although limestone weakens the adhesion between desulfurization slag and crucible,the activity of desulfurization slag reduces due to the formation of inert material quartz.Desulfurization slag from manganese residue with bauxite has low residual sulfur,high activity,and no adhesion to crucible.So,bauxite is a good desulfurizer for manganese residue.When the addition amount of bauxite is 42%(mass fraction),the desulfurization temperature is 1250℃,and the desulfurization holding time is 5 min,the sulfur content in the desulfurization slag is 0.0894%(mass fraction),which meets the desulfurization requirements.