Process for the production of sodium silicate from sodium sulphate. Sodium sulphate, to which are added sand and a reducing agent, is reacted continuously in a rotary furnace at an appropriate temperature between 1200 and 1400 degree C, the furnace being fed with briquettes comprising a suitable mixture of the aforementioned products. Coke, cereal husks, molasses, sawdust or other plant wastes and mixtures of these components are used as the reducing agent, and in addition to the briquettes already mentioned sodium carbonate is fed to the furnace in a proportion of between 1 and 5%. The SO2 resulting from combustion is recovered by oxidation of the resulting gases.
