高温还原焙烧法脱除电解锰渣中的硫

电解锰渣的化学成分与水泥的组成要求有较好的一致性,但高硫特性限制了其在水泥工业的应用。采用X-射线衍射仪(XRD)、热重-差示扫描量热仪(TG-DSC)和场发射扫描电镜-能谱仪(SEM-EDS)等手段分析了电解锰渣的基本物理化学特征。用高温还原焙烧法脱除电解锰渣中的S,研究了焙烧温度和煤掺量对烧渣的物相和S含量的影响。结果表明,电解锰渣中的主要结晶矿物为石膏、赤铁矿和石英;在不同温度下焙烧,当煤掺量不大于20%时,S含量随温度的升高呈下降趋势;煤掺量为25%时,S含量随温度的升高,先升高后降低;煤掺量为15%时的锰渣,当焙烧温度为1000℃,保温1 h后S含量最低,为3.12%,烧渣中的主要物相为Fe2O3、Fe3O4和Ca SO4。实验结果为电解锰渣的资源化利用提供了新的途径。

Removal of Sulfur from Electrolytic Manganese Residue through High Temperature Reduction Roast

The chemical composition of electrolytic manganese residue(EMR)has good consistency with the composition of cement, but high sulfur property limits its application in cement industry. The basic physicochemical characteristics of electrolytic manganese residue were analyzed by XRD, TG-DSC and SEM-EDS. The sulfur in EMR was removed by high temperature reduction roasting method. The effects of roasting temperature and coal content on the phase and sulfur content of baked residue were studied. The results show that the main crystalline minerals in the EMR were gypsum, hematite and quartz. The sulfur content decreased with the temperature increasing when the content of coal didn't exceed 20% at various temperature conditions. However, the sulfur content elevated at the initial, and then dropped with the temperature increasing when the content of coal is 25%. The addition of 15% coal to the EMR exhibited lowest sulfur content(3.12%) at temperature 1000 ℃ for 1 h. In this case, baked residue was mainly composed of Fe2O3, Fe3O4 and CaSO4. The experimental results provide a new way for the utilization of EMR.