镍钴富集物干燥特性及预还原工艺研究

Study on Drying Characteristics and Prereduction Process of Ni-Co Enrichment

以镍钴富集物为研究对象,开展了镍钴富集物干燥特性、压团性能、预还原温度、还原时间、还原剂、石英含量对镍还原度及锌挥发行为的影响研究。结果表明,控制干燥温度120~160℃,烘干3~4h可将镍钴富集物干燥至含水10%。干燥后的镍钴富集物压团性能较好,控制压团后物料含水10%~12%,压制的球团强度大于0.49kN。在预还原温度900℃、还原时间3h、无烟煤用量10%、SiO2用量10%的条件下,镍的还原度可达到91.22%,还原后球团保持强度0.294~0.343kN。还原过程中锌挥发率50%~60%,受还原条件影响较小,锰和镁几乎全部进入还原焙砂中。

Effects of drying characteristics, briquetting performance, prereduction temperature,reduction time,reducing agent,and quartz content on reduction degree of nickel and zinc volatilization behavior were studied applying Ni-Co enrichment as raw materials.The results show that Ni-Co enrichment can be dried to10% water content by controlling drying temperature of 120-160 ℃ and drying time of 3-4 h.Briquetting performance of dried Ni-Co enrichment is better,and pellet strength is higher than 0.49 kN when moisture content of material is controlled to be 10%-12%.Reduction degree of nickel is 91.22% under the conditions of prereduction temperature of 900℃,reduction time of 3 h,anthracite dosage of 10%and SiO2 dosage of 10% during reduction process.Volatilization rate of zinc is 50%-60%,which is less affected by reduction conditions,and almost all of manganese and magnesium enter reduction calcine.