The study with barium hydroxide to remove sulphur from the monowater lithium hydroxide.The best technology condition of testing is:barium hydroxide added is 22% of the theoretical amount,barium hydroxide of which the concentration is 19.6g/L,ageing time is 2 hours,ageing temperature 40℃,concentration of the SO 2- 4 of the liquor is reduced from 6.8g/L to 2.3g/L.
A mathematical model of the determination of the iron in water using the method of primary secondary wavelengths was proposed.According to the relation between absorbance (A) and the wavelength of the irradiation light(λ) and the iron(x) in water,a way with high accuracy to determine the iron in water was investigated.The calculation curve is stable and hardly affected by environmental conditions.Experiments with water samples have shown that the detection limit was 0.015μg·ml -1 ,RSD≤3.5%,and the recovery rate was 95.4%～101.6%.
