硫钴精矿含碳球团压力成型试验研究

Research on the Molding of Sulfur Cobalt Concentrate Pellets Containing Carbon

以攀枝花硫钴精矿为原料,聚乙烯醇为黏结剂,采用单因素试验研究了水分含量、成型压力、硫钴精矿粒度、黏结剂用量等因素对硫钴精矿含碳球团抗压强度和落下强度的影响。结果表明:球团强度随着水分含量的增加先小幅波动后快速提高,随着黏结剂用量的增加呈先提高后降低的趋势,随着压强(成型压力建议前后一致)的增大和粒度的细化呈"N"字形变化。得出优化的硫钴精矿含碳球团制备工艺参数为:矿煤质量比5∶1,水分含量12%,成型压力6 MPa,黏结剂用量0.6%,硫钴精矿粒度-200目(74μm)占75%。此条件下制备的硫钴精矿含碳球团生球团的抗压强度为192.6 N/球,落下强度为28.4次/球;干球团的抗压强度为348.2 N/球,落下强度为57.2次/球。

Using Panzhihua sulfur cobalt concentrate as raw materials and polyvinyl alcohol as binding agent,the influences of moisture content,molding pressure,particle size of sulfur cobalt concentrate and content of binding agent on the compression strength and drop strength of the sulfur cobalt concentrate pellets containing carbon were studied by single factor experiments. The results show that the strength of the pellets fluctuates slightly and then increases rapidly with increase of the moisture content,and it increases firstly and then decreases with increase of the binding agent content.Besides,with increase of the pressure and refinement of the grains,the trend of strength of the pellets presents N-type. The optimized technology parameters obtained are 5 ∶ 1 for mass ratio of mineral to coal,12% of moisture content,6 MPa of the molding pressure,0.6% of binding agent content and 75% of sulfur cobalt concentrate with particle size lower than 74 μm.Under these conditions mentioned above,the compression strength and drop times are separately 192.6 N/pellet and 28.4 times/pellet for the wet pellets,348.2 N/pellet and 57.2 times/pellet for the dried pellets,respectively.