Preliminary Study on High-Temperature Consolidation Conditions for Carbon-Bearing Phosphate Ore Pellets
In order to avoid formation of material ring in a rotary kiln caused by kiln phosphoric acid process,a technique of high-temperature consolidation of pellets was proposed,and the effects of types of binder,temperature and time of consolidation on the strength and reducibility of phosphate ore pellets were investigated.The results show that consolidation at a temperature over 800℃with bentonite as binder can lead to the pellets with compressive strength and drop numbers obviously higher than those with sodium humate as the binder.With an addition of carbon at 1.4 times of the theoretical amount,CaO and SiO2 at a molar ratio of 0.35,an addition of bentonite at an amount of 1.5%of the total material weight,consolidation at 1 000℃for 30 min results in the produced pellets with compressive strength of 345.36 N and drop numbers of 33.50.
phosphoric acidcarbon-bearing pellethigh-temperature consolidationkiln phosphoric acidmaterial ring in a rotary kilnpellet strengthbinderbentonitesodium humate
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