Apparatus for roasting sulfides

Claim 1

AN IMPROVED APPARATUS FOR FLUID-BED ROASTING OF METALLIIC SULFIDES WHICH COMPRIISES A SINGLE FLUID-BED ROAOST ING CHAMBER; A PORT LOCATED IN THE WALL OF SAID ROASTING CHAMBER FOR FEEDING SAID FINELY-DIVIDED SSOLIDS THEREINTO A HEART AT THE BOTTOM OF SAID ROASTING CHAMBER HAVING AT LEAST ONE GAS INLET PORT FOR INTRODUCING AN OXIDIZING GAS CONTAINING A SUBSTANTIAL PROPORTION OF FREE OXYGERINTO SAID ROASTING CHAMBER; A FIRST SOLIDS-GAS EXHAUST PORT LOCATED IN THE UPPER REGION OF SAID ROASTING CHAMBER FOR REMOVING EXHAUST GASES HAVING ENTRAINED THEREIN FINELY DIVIDED ROSTED SOLIDS; A PRIMARY SOLIDS-GAS SE PARATOR FOR SEPARATING FROM SAID EXHAUST GASES THE BULK OF THE FINELYDIVIDED SOLIDS ENTRAINED THEREIN; A SOLIDS-GAS INTAKE PORT IN SAID PRIMARY SE PARATOR CONNECTED TO SAID FIRST SOLIDSGAS EXHAUST PORT IN SAID ROASTING CHAMBER; A SOLIDS OUTLET PORT IN SAID PRIMARY SOLIDS-GAS SEPARATOE; MEANS FOR RETURNING SAID SEPARATED BULK OF THE FINELY-DIVIDED ROASTED SOLIDS FROM SAID SSOLIDS OUTLET PORT INTO SAID ROASTING CHAMBER IN AN AMOUNT SUBSTANTIALLY GREATER THAN THE AMOUNT OF UNROASTED SULFIDES BEING FED INTO SAID ROASTING CHAMBER; A SECONDARY SOLIDS-GAS SEPARATOR; A SOLIDS-GAS OUTLET PORT IN SAID PRIMARY SEPARATOR CONNECTED TO A SOLIDS-GAS INLET PORT IN SAID SECONDARY SOLIDS-GAS SEPARATOR;A SOLIDSS OUTLET PORT FOR PRODUCT DISCHARGE AND A GAS OUTLET PORT IN SAID SECONDARY SOLIDS-GAS SEPARATOR; A SECOND SOLIDSGAS EXHAUST PORT LOCATED IN THE UPPER REGION OF SAID ROASTING CHAMBER; AND MEANS CONNECTING SAID SECOND SOLIDSGAS EXHAUST PORT IN THE ROASTING CHAMBER TO A SOLID-GAS INLET PORT IN SAID SECONDARY SOLIDSS-GAS SEPARATOR FOR CONVEYING SOLIDS-CONTAINING EXHAUST GASES FROM SAID ROASTING CHAMBER TO SAID SECONDARY SOLIDS-GAS SEPARATOR AND PROVIDED WITH MEANS FOR CONTROLLING THE FLOW OF SOLIDS-CONTAINING EXHAUST GASES THEREBETWEEN.