PROCEDE ET APPAREIL POUR LA PREPARATION D'UNE SOLUTION DE THIOSULFATE DE MANGANESE (MNTS)

An efficient semi-continuous preparation of manganese thiosulfate (MnS2O3, MnTS) from manganese hydrosulfite and sulfur at elevated temperature is described. Manganese hydrosulfite is prepared from commercial manganese carbonate and sulfur dioxide. The resulting product is an emulation of liquid manganese thiosulfate and solid by-products. A manganese thiosulfate solution is produced according to the invention by use of certain mole ratios of MgCO3 to sulfur, and certain parameters such as the temperature of the reaction process and the pH conditions, including rate and duration of SO2 purging, which causes the by-products to be reduced to less than 2% by weight. The resulting manganese thiosulfate is a pinkish liquid with concentration up to 20%.