SMM Daily Review: Cobalt Sulphate Spot Prices Remained Stable on April 23. The SMM cobalt sulphate index price was 49,145 yuan/mt, up 2 yuan/mt from the previous working day. The spot price of cobalt sulphate ranged from 48,550 to 50,200 yuan/mt, with an average of 49,375 yuan/mt, flat from the previous working day. Supply side, salt plant quotes were basically flat compared to yesterday, with mainstream salt plants maintaining a firm stance on quotes. Demand side, inquiries and purchases from downstream enterprises were slightly weaker, with a strong wait-and-see sentiment prevailing, resulting in overall subdued market transactions.