Research on the Molding of Sulfur Cobalt Concentrate Pellets Containing Carbon

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.