Recovery of magnesium sulfate from a solution of a mixture of magnesium sulfate and transition metal sulfates

Abstract From the Canadian patent

There is provided a process for enhancing the sulfur trioxide and transition metal values contained in the flue gases from the roasting of sulfide-containing ores while recovering the magnesium values contained in asbestos tailings, which comprises a) reacting an excess of asbestos tailings with the acidic rinse waters obtained after scrubbing the flue gases emitted in the roasting of sulfidecontaining ores, said acidic rinse water containing free sulfuric acid, the sulfates of the transition metals contained in the starting sulfide-containing ore and solid particulates, whereby there is formed the soluble sulfate of magnesium along with silica gel and after filtering; b) recovering the …