Volatilization of tin values of tin ores

Claim 1

A PROCESS FOR CONTINUOUSLY VOLIATILIZING TINVALUES OF TIN-BEARING SULFIDE ORE, WHICH COMPRISES ESTABLISHING A BED OF SUCH ORE IN A VOLATILIZING ZONE, PASSING AN UPRISING STREAM OF GAS THERETHROUGH AT A VELOCITY SUFFICIENT TO FLUIDIZE THE ORE OF THE BED AND HEATED TO A TEMPERATURE SUFFICIENT TO MAINTAIN THE TEMPERATURE OF THE BED BETWEEN SUBSTANTIALLY 825* C. AND SUBSTANTIALLY 940* C., ESTABLISHING AND MAINTAINING THE SULFURVAPOR CONTENT OF THE UPRISING GAS WHILE IN THE BED AT LEAST AT VALUE OF 1% BY VOLUME TO VOLATILIZE TIN-SULFIDE, DISCHARGING ORE SOLIDS FROM THE BED TO ESTABLISH A FURTHER BED, MAINTAINIG THE LATTER AT ROASTING TEMPERATURE, PASSING THROUGH THE FURTHER BED A STREAM OF UPRISING GAS AT A VELOCITY SUFFICEINT TO FLUIDIZE THE ORE THEREOF BEARING OXYGEN IN QUANTITY SUFFICIENT TO ROAST THE OXIDIZABLE CONTENTS OF THE BED AS WELL AS TO YIELD AN OXYGEN-LEAN GAS HEATED SUBSTANTIALLY TO ROASTING TEMPERATURE, AND INTRODUCING THE OXYGENLEAN HEATED GAS TO THE VOLATILIZING ZONE TO CONTROL SIMULTANEOUSLY THE TEMPERATURE AS WELL AS THE SULFUR-VAPOR PRESSURE IN THE VOLATILIZNG ZONE.