A method for the production of calcium chloride and tin compounds of tin ores, ore concentrates, slags, and the like.

摘要

Continuous separation of tin from minerals, slags etc. Process consists of forming briquettes with a mixture of the mineral with a carbonaceous material and sodium chloride sufficient to provide 1.1-7 times the chlorine stoichiometrically required by the Sn content, which are then heated in rotary furnace for 30-120 min at a sufficient temperature to evolve SnCl4 (above 750 degrees C). The volatilised SnCl4 is passed into a solution of Ca(OH)2 at above 60 degrees C, to yield SnO2 The furnace has a central burner fed with insufficient air for full combustion so as to provide an inert furnace atmosphere and surrounding burners supplied with excess air sufficient to complete the combustion.