Patents Assigned to Thann et Mulhouse S.A.
  • Process for the production of pigmentary titanium dioxide by the sulphuric acid method
    Patent number: 4206021
    Abstract: In the sulphuric acid process for the production of pigmentary titanium dioxide from titaniferous ores such as ilmenite, in which the sulphuric acid digestate is reduced electrolytically in the cathode compartment of an electrolytic cell, to convert Fe III in the digestate to Fe II, substantial reductions in electric power consumption can be achieved by introducing a ferrous sulphate solution as anolyte instead of sulphuric acid. The ferrous sulphate used is preferably recycle material obtained in the catholyte in an earlier reduction cycle.
    Type: Grant
    Filed: February 27, 1979
    Date of Patent: June 3, 1980
    Assignee: Thann et Mulhouse S.A.
    Inventor: Marc X. Rivory