Energy conserving process for purifying iron oxide
AssigneeCities Service Company
InventorJames E. Barker
Life of this patent
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Abstract
Chemical waste by products are used in place of conventional heating fuels both for induration and chloridization of impure iron oxide. Pelletized iron oxide is hardened and purified simultaneously by exposure to the heat and combustion products generated from burning chlorinated organic by-products. Hydrogen chloride produced during this combustion reacts with trace metal impurities in the iron oxide to effectively remove substantially all such impurities as volatile metal chlorides. Conventional fuel and binder requirements are substantially reduced or completely eliminated through use of such by-products, while remedying the problem of their disposal.
Claims27
In a process of the purification of iron oxide normally using conventional fuels and conventional chlorinating agents and having the steps of:
- a. Adding to the iron oxide a sufficient amount of binder,
- b. Pelletizing the resulting mixture,
- c. Drying the pellets and
- d. Indurating the pellets to a temperature ranging from about 1200.degree. C to about 1250.degree. C and concurrently chlorinating the pellets using a conventional chlorinating agent:
- the improvement comprising indurating and concurrently chlorinating the pellets using heat and chlorine valves generated by combustion of a chlorinated hydrocarbon fuel having a heat of combustion of at least about 11,000 BTU/pound, said fuel comprising a mixture of chlorinated organic compounds having a combined elemental analysis of about 56% to about 87% carbon and about 9% to about 15% hydrogen and about 1% to about 35% chlorine.
In a process for the purification of iron oxide normally using conventional fuels and conventional chlorinating agents and having the steps of:
- a. Adding to the iron oxide a sufficient amount of binder,
- b. Pelletizing the resulting mixture,
- c. Drying the pellets and
- d. Indurating the pellets to a temperature ranging from about 1200.degree. C to about 1250.degree. C and concurrently chlorinating the pellets using a conventional chlorinating agent:
- the improvement comprising indurating and concurrently chlorinating the pellets using heat and chlorine values generated by combustion of a blended fuel mixture, said mixture comprising a highly chlorinated hydrocarbon fuel having a heat of combustion of under about 11,000 BTU/pound, and a sufficient amount of partially chlorinated hydrocarbon fuel to increase the heat of combustion of the final blended fuel mixture to at least about 12,000 BTU/pound, the highly chlorinated hydrocarbon fuel being comprised of a mixture of chlorinated organic compounds having a combined elemental analysis of about 28% to about 56% carbon, about 2% to about 8% hydrogen and about 36% to about 70% chlorine, the partially chlorinated hydrocarbon fuel being comprised of a mixture of chlorinated organic compounds having a combined elemental analysis of about 56% to about 87% carbon, about 9% to about 12% hydrogen and about 1% to about 35% chlorine.
In a process for the purification of iron oxide normally using conventional fuels and conventional chlorinating agents and having the steps of:
- a. Adding to the iron oxide a sufficient amount of a binder,
- b. Pelletizing the resulting mixture,
- c. Drying the pellets and
- d. Indurating the pellets to a temperature ranging from about 1200.degree. C to about 1250.degree. C and concurrently chlorinating the pellets using a conventional chlorinating agent:
- the improvement comprising indurating and concurrently chlorinating the pellets using heat and chlorine values generated by the combustion of a blended fuel mixture, said fuel mixture being comprised of a highly chlorinated hydrocarbon fuel having a heat of combustion of at least about 4,000 BTU/pound and a sufficient amount of fuel oil to provide the final blended fuel mixture with a heat of combustion of at least about 12,000 BTU/pound, said highly chlorinated hydrocarbon fuel being comprised of a mixture of chlorinated organic compounds having a combined elemental analysis of about 20% to 56% carbon, about 2% to about 8% hydrogen and about 36% to about 70% chlorine.
A method for disposing of chlorinated hydrocarbon by-products, which comprises burning said by-products as fuel in the presence of iron oxide having trace metal impurities to chloridize and indurate the iron oxide, said fuel providing a heat of combustion of at least about 11,000 BTU/pound and comprising a mixture of chlorinated organic compounds having a combined elemental analysis of about 56% to about 87% by weight carbon, about 9% to about 15% by weight hydrogen and about 1% to about 35% by weight chlorine.
A method for disposing of chlorinated hydrocarbon by-products, which comprises burning said byproducts as fuel in the presence of iron oxide having trace metal impurities to chloridize and indurate the iron oxide, said fuel being a mixture comprising (1) a highly chlorinated hydrocarbon fuel having a heat of combustion of under about 11,000 BTU/pound and (2) a sufficient amount of a partially chlorinated hydrocarbon fuel to increase the heat of combustion of the final blended fuel to at least about 12,000 BTU/pound, the highly chlorinated hydrocarbon fuel being comprised of a mixture of chlorinated organic compounds having a combined elemental analysis of about 28% to about 56% carbon, about 2% to about 8% hydrogen and about 36% to about 70% chlorine, the partially chlorinated hydrocarbon fuel comprising a mixture of chlorinated organic compounds having a combined elemental analysis of about 56% to about 87% carbon, about 9% to about 15% hydrogen and about 1% to about 35% chlorine.
Dependencies are inferred from the claim text.