Production of selenium oxide, tellurium oxide or mixture thereof

Claim 2

IN THE PRODUCTION OF CRYSTALLINE SELENIUM OXIDE FROM MATERIAL CONTAINING ELEMENTAL SURFUR AND SELENIUM, THE PROCESS WHICH COMPRISES ADJUSTING THE WATER CONTENT TO BETWEEN ABOUT 2% TO 10% IN THE STARTING MATERIAL, FEEDING SAID STARTING MATERIAL INTO A FIRST COMBUSTION CHAMBER AND BURNING IT AT A TEMPERATURE ABOVE ABOUT 500*C. IN THE PRESENCE OF AN OXYGEN RICH OXIDIZING GAS, LEADING THE RESULTANT PRODUCTS INTO A SECOND COMBUSTION CHAMBER LIKEWISE MAINTAINED AT A TEMPERATURE ABOVE ABOUT 500*C. IN THE PRESENEC OF AN OXYGEN RICH OXIDIZING GAS WHERE ANY SULFUR AND SELENIUM PRESENT IN SAID RESULTANT PRODUCTS ARE FURTHER OXIDIZED, THEN LEADING THE OUTPUT FROM SAID SECOND COMBUSTION CHAMBER INTO CONDENSERS HAVING OUTLETS MAINTAINED AT A TEMPERATURE OF ABOVE ABOUT 70*C., THE SELENIUM OXIDE BEING RECOVERED FROM SAID OUTLETS, RECOVERING A MIXTURE OF ELEMENTAL SULFUR AND SELENIUM FROM SUCCEEDING DUST COLLECTING EQUIPMENT HAVING OUTLETS MAINTAINED AT A TEMPERATURE BELOW ABOUT 70*C., AND SUBJECTING ANY ELEMENTAL SULFUR AND SELENIUM MIXTURE OBTAINED IN SAID FIRST TREATMENT TO A SECOND TREATMENT CARRIED OUT BY THE PROCESS OF SAID FIRST TREATMENT, THE CONCENTRATION OF THE ELEMENTAL SULFUR AND SELENIUM IN THE STARTING MATERIAL FED INTO THE FIRST COMBUSTION ZONE IN EACH TREATMENT BEING RESPECTIVELY MORE THAN ABOUT 30% BY WEIGHT AND AT LEAST ABOUT 3.3% BY WEIGHT.

Claim 3

IN THE PRODUCTION OF CRYSTALLINE SELENIUM OXIDE AND TELLURIUM OXIDE FROM A MATERIAL CONTAINING ELEMENTAL SULFUR, SELENIUM AND TELLURIUM, THE PROCESS WHICH COMPRISES ADJUSTING THE WATER CONTENT TO BETWEEN ABOUT 2% TO 10% IN THE STARTING MATERIAL, FEEDING SAID STARTING MATERIAL INTO A FIRST COMBUSTION CHAMBER AND BURNING IT AT A TEMPERATURE ABOVE ABOUT 500*C. IN THE PRESENCE OF AN OXYGEN RICH OXIDIZING GAS, LEADING THE RESULTANT PRODUCTS INTO A SECOND COMBUSTION CHAMBER LIKEWISE MAINTAINED AT A TEMPERATURE ABOVE ABOUT 500*C. IN THE PRESENCE OF AN OXYGEN RICH OXIDIZING GAS WHERE ANY SULFUR, SELENIUM AND TELLURIUM PRESENT IN SAID RESULTANT PRODUCTS ARE FURTHER OXIDIZED, THEN LEADING THE OUTPUT FROM SAID SECOND COMBUSTION CHAMBER INTO CONDENSERS HAVING OUTLETS MAINTAINED AT A TEMPERATURE ABOVE ABOUT 70*C., THE SELENIUM OXIDE AND TELLURIUM OXIDE BEING RECOVERED FROM SAID OUTLETS, RECOVERING ELEMENTAL SULFUR, SELNIUM AND TELLURIUM FROM SUCCEEDING DUST COLLECTING EQUIPMENT HAVING OUTLETS MAINTAINED AT A TEMPERATURE BELOW ABOUT 70*C., AND SUBJECTING THE ELEMENTAL SULFUR, SELENIUM AND TELLURIUM SO RECOVERED TO A SECOND TREATMENT CARRIED OUT BY THE PROCESS OF THE FIRST TREATMENT, THE CONCENTRATION OF THE ELEMENTAL SULFUR IN THE STARTING MATERIAL FED INTO THE FURNACE IN EACH TREATMENT BEING MORE THAN ABOUT 30% BY WEIGHT, AND THE CONCENTRATION OF THE ELEMENTAL SELENIUM AND TELLURIUM IN THE STARTING MATERIALS FED INTO FIRST COMBUSTION ZONE IN EACH TREATMENT BEING RESPECTIVELY AT LEAST ABOUT 3.3% AND 1.4% BY WEIGHT.

Claim 4

IN THE PRODUCTION OF CRYSTALLINE SELENIUM OXIDE AND TELLURIUM OXIDE FROM A MATERIAL CONTAINING ELEMENTAL SULFUR, SELENIUM AND TELLURIUM, THE PROCESS WHICH COMPRISES ADJUSTING THE WATER CONTENT TO BETWEEN ABOUT 2% TO 10% IN THE STARTING MATERIAL, FEEDING SAID STARTING MATERIAL INTO A FIRST COMBUSTION CHAMBER AND BURNING IT AT A TEMPERATURE ABOVE ABOUT 500*C. IN THE PRESENCE OF AN OXYGEN RICH OXIDIZING GAS, LEADING THE RESULTANT PRODUCTS INTO A SECOND COMBUSTION CHAMBER LIKEWISE MAINTAINED AT A TEMPERATURE ABOVE ABOUT 500*C. IN THE PRESENCE OF AN OXYGEN RICH OXIDIZING GAS WHERE ANY SULFUR, SELENIUM AND TELLURIUM PRESENT IN SAID RESULTANT PRODUCTS ARE FURTHER OXIDIZED, THEN LEADING THE OUTPUT FROM SAID SECOND COMBUSTION CHAMBER INTO CONDENSERS HAVING OUTLETS MAINTAINED AT A TEMPERATURE ABOVE ABOUT 70*C., THE SELENIUM OXIDE AND TELLURIUM OXIDE BEING RECOVERED FROM SAID OUTLETS, RECOVERING ELEMENTAL SULFUR, SELNIUM AND TELLURIUM FROM SUCCEEDING DUST COLLECTING EQUIPMENT HAVING OUTLETS MAINTAINED AT A TEMPERATURE BELOW ABOUT 70*C., AND SUBJECTING THE ELEMENTAL SULFUR, SELENIUM AND TELLURIUM SO RECOVERED TO A SECOND TREATMENT CARRIED OUT BY THE PROCESS OF THE FIRST TREATMENT, THE CONCENTRATION OF THE ELEMENTAL SULFUR IN THE STARTING MATERIAL FED INTO THE FURNACE IN EACH TREATMENT BEING MORE THAN ABOUT 30% BY WEIGHT, AND THE CONCENTRATION OF THE ELEMENTAL SELENIUM AND TELLURIUM IN THE STARTING MATERIALS FED INTO FIRST COMBUSTION ZONE IN EACH TREATMENT BEING RESPECTIVELY AT LEAST ABOUT 3.3% AND 1.4% BY WEIGHT.