The invention belongs to the technical field of aluminum
oxide production, and particularly relates to a circulating
mother liquor feeding device for producing aluminum
oxide and a feeding method. According to the circulating
mother liquor feeding device, a
static mixer is horizontally installed on the top of a circulating
mother liquor groove to make
evaporation mother liquor and caustic soda liquid which come from an
evaporator station enter from one end of the
static mixer, the discharging position is 5 m or above higher than the tops of the mother liquor groove and a desilicication groove, circulating mother liquor automatically flows to the process of
raw material grinding and predesilicification by means of
residual pressure and a
height difference, and the circulating mother liquor groove is only used for temporary storing when the
evaporator station is
shut down for maintenance. According to the circulating mother liquor feeding device and the feeding method, the process is simplified, the number of power devices is decreased, the energy is saved, the consumption is reduced, the
workload of repair and maintenance is reduced, input of pipelines, valves,
pipe fittings and the like is reduced, the investment is reduced, the construction investment can be reduced by about three million RMB, and the
operating cost is reduced by about 5.65 million RMB.