Process for the thermal decomposition of metal sulphates

Details Process for the thermal decomposition of metal sulphates Process for the thermal decomposition of metal sulphates

C - Chemistry, Metallurgy

22

B

53/17

C22B 1/10 (2006.01) C01B 17/50 (2006.01) C22B 5/08 (2006.01)

Patent

CA 2007902

Process for the Thermal Decomposition of Metal Sulphates SO2-containing ABSTRACT OF THE DISCLOSURE A process for the thermal decomposition of metal sulphate mixtures at temperatures from 800 to 1100°C under oxidizing conditions, in which the metal sulphate mixtures are mixed with roasting residue and reacted together with fuels in the decomposition reactor to form roasting residue and SO2-containing gases from roasting wherein the roasting residue admixed with the sulphate mixture is the finely divided fraction of the resulting roasting residue which is separated from the stream of gas in an electrostatic gas purification apparatus and returned to the decomposition reactor. This procedure has an advantageous influence on the formation of coarse roasting residue and also significantly reduces the proportion of undecomposed, water soluble sulphates in the roasting residue. Le A 26 535

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