油脂脱色废白土二次煅烧再生工艺的研究

Regeneration of spent bleaching clay by secondary calcination

采用二次煅烧对油脂脱色废白土进行再生,对煅烧温度及煅烧时间进行了探索研究。通过实验确定最佳脱色废白土再生条件为520℃两次煅烧0.5 h,该条件下所得再生白土脱色率可达79.79%,接近于新活性白土的脱色效果(82.18%),实现了循环利用、节约成本、节能降耗、环保安全的目标。

The spent bleaching clay was regenerated by secondary calcination, and the calcination temperature and calcination time were studied. The optimal regeneration conditions of spent bleaching clay were determined as follows: twice calcination at 520℃ for 0.5 h. Under these conditions,the bleaching rate of recycled clay reached 79.79%,close to the bleaching effect of new activated clay(82.18%), which achieved the goal of recycling, cost saving, energy saving, environmental protection and safety.