Experimental research on balling characteristics and preparation for pellets of phosphate rock powder
The balling ability of fine grained phosphate rock powder,green pellet quality and preheating-roasting and bonding characteristics of pellet in the grinding,pelletizing and roasting process are experimental studied.The static balling index is used to evaluate the pelletizing property of fine phosphate rock powder.The green phosphate pellet quality under different grinding fineness,pellet size and moisture conditions and the effect of preheating and roasting parameters on the quality of roasted pellets are investigated.The results show that the static balling index K is significantly different between various kinds of grained phosphate rock powder,and increased grinding fineness raised the stable adsorption water of fine particles then improve their balling performance.Under suitable moisture condition,the green pellets with diameter of 10-30 mm are prepared from mixed fine ground phosphate rock powder(acidity 0.85),the drop number reached more than 4.0/0.5 m and compressive strength above 48 N,which can meet the requirements of pellets producing organization.Due to the relatively lower compressive strength of preheating pellet,static roasting process shall be adopted for the phosphate rock powder pellets,with roasting condition of 1 120-1 150℃and 9-12 min,the compressive strength of phosphate rock pellet can reach more than 850 N by solid phase consolidation,which meets the requirements of yellow phosphorus production in electrical furnace.
phosphate rock powderpelletballing abilityroastingcompressive strength
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