Abstract：To investigate the distribution of lithium slag particle size, the effect of mass concentration of lithium slag solution, ultrasonic dispersion time and frequency, and dispersion medium on particle size of lithium slag was analyzed by a LS-POP (Ⅵ) type laser particle size analyzer. The correlation of specific surface area measured by a SBT-127 type digital Blaine permeability surface area analyzer and a laser particle size analyzer was discussed. The results show that comparing with kerosene and anhydrous ethanol, the dispersion effect of lithium slag is better by water which is suitable for a dispersion medium to lithium slag. Taking water as the dispersion medium, the test conditions of lithium slag particle size are as follows. The mass concentration of lithium slag solution is 3 to 4 g/L,ultrasonic dispersion time is not less than 4 min, and dispersion frequency is not less than 40 k Hz. Repeating the experiment five times with these conditions, it is found that distribution curves coincide of lithium slag particle size is relatively good, and the coefficient of variation of median diameter is less than 3%. The correlation between specific surface areas measured by the methods of laser diffraction and digital Blaine permeability is good, but the former is less than the latter.

Keywords: lithium slag; particle size; detection condition; correlation