DENG Qiang, CHEN Lirong

(Geological and Mineral Central Laboratory of Guizhou Province, Guiyang, Guizhou 550018, China)

Abstract: Based on experimental research, recycling of kaolin from high-sulfur coal measures in Guizhou was realized through floating, desulfurization, screening, discarding oversize sieve residue as tailings, ultra fine grinding minus sieve, chlorinating and calcining. The results show that the sulfur removal rate of the kaolin is over 96% through the process of one roughly, once finely, and once sweepingly desulphurizing. The XT (D) -level 2 calcined kaolin for rubber industry was obtained through the process of screening the desulfurized kaolin and ultra fine grinding the minus sieve, doping the batch with 4% of NaCl, calcining the mixture at 1000°C for 3h.

Key words:  kaolin from coal measures; bleaching; desulphurization; flotation; comprehensive utilization