Apparatus and process for melting material of high melting point

Claim 1

THE PROCESS OF MELTING A HIGH MELTING MATERIAL FREEE FROM CONTAMINATION, WHICH COMPRISES PREHEATING INERT GAS IN A SEPARATE PREHEATING CHAMBER, METERING PARTICLES OF THE MATERIAL TO BE MELTED AT A RATE SUFFICIENTLY LOW SO THAT THE PARTICLES WILL PASS THROUGH A FIRST FURNACEE CHAMBER INDIVIDUALLY, INTRODUCING THE METERED PARTICLESS OF THE MATERIAL TO BE MELTED NEAR THE TOP OF THE FIRST FURNACE CHAMBER, PASSING THE INERT GAS FROM THE PREHEATING CHAMBER INTO THE FIRST FURNACE CHAMBER AND SEPARATING THE PARTICLES BY THE GAS IN THE FURNACE CHAMBER ANDD THEREBY RETARDING THE DOWNWARD FLOW OF THE PARTICLES WHILE BY THE SENSIBLE HEAT OF THE INERT GAS, ADDITIONALLY HEATINGG THE FIRST FURNACE CHAMBER, DROPPING THE PARTICLES THROUGHH THE FIRST FURNACE CHAMBER INTO A SECOND BOOSTER FURNACE GAS, AND IN THE BOOSTER CHAMBER HEATING THE PARTICLES TO A TEMPERATURE SUBSTANTIALLY ABOVE THE MELTING POINT OF THE MATERIAL TO BE MELTED.