GB191508128A - Improved Process and Apparatus for the Manufacture of Sodium Sulphate and Cement. - Google Patents

Abstract

8128. Basset, L. P. June 11, 1914, [Convention date]. Chlorine.-In the production of sodium sulphate and chlorine by the Hargreave's process, the reaction is effected with the sodium chloride in the form of vapour or fine mist produced by condensation of the vapour. The sodium chloride may be volatilized in a combustion or muffle furnace, or may be mixed with materials which, on heating, liberate sulphurous acid, for instance gypsum, clay, and coal, in which case cement also is produced. The sodium sulphate is carried forward by the gas stream and deposited. In an example, the sodium chloride is fed from a hopper b by a screw c into a combustion furnace a, and is carried off through a pipe h and mixes in a baffle chamber i with sulphurous-acid gases supplied through a pipe l; or these gases may be admitted by a pipe l<1> to the furnace a. Sodium sulphate collects in a chamber and the exit gases may be filtered. In another example, the sodium chloride, in quantity equivalent to the gypsum, is mixed with a cement charge of gypsum, coal, and clay, the dry or wet mixture being charged through a feed m into a rotary cement furnace n, of the kind described in Specification 17,873/13, heated by oxidizing or neutral gases from a fire-box o. Further air may be admitted about the middle of the furnace n. The sodium sulphate is carried off by the gases at q and collected in a settling-chamber.