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Anson Gardner Betts
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15,308. Betts, A. G. July 8. Lead dithionate; manganese peroxide potassium permanganate.-In the preparation of lead dithionate a solution of manganese dithionate, prepared as usual by passing sulphur dioxide into cold water containing suspended manganese dioxide, is freed from manganese sulphate, by precipitating with lead dithionate. The resulting solution of manganese dithionate is treated with lead dioxide, lead dithionate and manganese dioxide being formed. The manganese dioxide may be used again, but being purer than the ore, it is preferably used for making manganese products such as potassium permanganate.
GB190415308D1904-07-081904-07-08An Improved Process of Making Lead Dithionate
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Improvements in connection with the Treatment of Arsenical Sulphur Ores for the Obtainment of Arsenious Acid and of Sulphuric Acid deprived of Arsenic.
A New or Improved Process for Separating from their Ores Copper Silver, Lead, Mercury, and all other Metals adapted to be Precipitated from an Acid Solution by Means of Sulphuretted Hydrogen.