Abstract:

China is rich in barite resources.In order to make scientific and rational use of barite and avoid waste in barite development,the barite in Tianzhu of Guizhou was reduced and roasted in a rotary kiln of ?3.2 m×60 m.The effects of roasting temperature and coal throwing on the reduction performance of barite were investigated.The results revealed that when the temperature of high temperature zone was 1 050~1 200 ℃,the temperature of kiln tail was 500~600 ℃,the temperature of kiln head was 750~850 ℃,the rotary kiln speed was 0.20~0.40 r/min,the processing capacity was 15~20 t/h,and the coal consumption per ton of mine was 191.64 kg,the content of barium sulfide in obtained crude barium reached 70.5% and the crude barium leaching rate reached good index of 91.3%.The roasted ore and the leaching assessment index were all qualified,which had important practical significance for rational utilization of barite resources with huge reserves in China.

Key words: barite, crude barium, rotary kiln, reduction roasting