IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0868024
(1992-04-13)
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발명자
/ 주소 |
- Morgenthaler George W. (Boulder CO) Struthers Jeffrey L. (Falls Church VA) Carter George W. (Gloucester CAX)
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| 출원인 / 주소 |
- Columbia Ventures Corporation (Vancouver WA 02)
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| 인용정보 |
피인용 횟수 :
62 인용 특허 :
0 |
초록
▼
Spent potliner from aluminum reduction cells includes carbon, inorganic brick and refractory material, and fluoride, sulfur, and cyanide compounds, and is considered hazardous. It is treated by introducing it into a vessel, and exposing it to the heat of a plasma torch at a temperature of at least 1
Spent potliner from aluminum reduction cells includes carbon, inorganic brick and refractory material, and fluoride, sulfur, and cyanide compounds, and is considered hazardous. It is treated by introducing it into a vessel, and exposing it to the heat of a plasma torch at a temperature of at least 1000°C. As a result, carbon is gasified and converted to combustible carbon monoxide or hydrocarbons, or to carbon dioxide; inorganic material is melted form slag; fluoride compounds are melted, vaporized, or reduced to gaseous HF; cyanide compounds are destroyed; and all other materials, including sulfur compounds, are either melted or gasified. As a result, the spent potliner is rendered non-hazardous, and the quantity of remaining slag has both its solid volume and mass substantially reduced by a factor of at least 1.5:1 in mass and at least 3:1 in volume relative to the input spent potliner. The process allows gaseous fluoride compounds to be captured and thermal energy produced in the process to be extracted. The molten slag material produced within the vessel is removed from the vessel, and cooled to form a solid slag which is substantially free of cyanide compounds, resistive to leaching, and safe for disposal. The slag has commercial utility. Combustible carbon compounds can be captured and used. When carried out at an aluminum smelting site, adequate electrical power is readily available, and there is an in situ demand for recovered fluoride compounds, combustible gases, and extracted heat.
대표청구항
▼
A method of treating hazardous solid spent potliner material from aluminum reduction cells, which solid spent potliner material has an initial volume and mass, and includes solid carbon material, solid inorganic material, fluoride compounds, sulfur compounds, and cyanide compounds, including the ste
A method of treating hazardous solid spent potliner material from aluminum reduction cells, which solid spent potliner material has an initial volume and mass, and includes solid carbon material, solid inorganic material, fluoride compounds, sulfur compounds, and cyanide compounds, including the steps of: a. introducing said solid spent potliner materials into a vessel; and then b. exposing said spent potliner materials to the heat of a plasma torch within said vessel for a time and at a temperature such that: i. said solid carbon material portion of said spent potliner material is substantially completely gasified and converted to a carbon compound selected from the group consisting of combustible carbon monoxide, carbon dioxide, or combustible hydrocarbons, and mixtures of the same; ii. said solid inorganic material is substantially completely melted within said vessel to form slag; iii. said fluoride compounds are either melted, reduced or vaporized within said vessel; iv. said cyanide compounds are all substantially completely destroyed by pyrolysis, dissociation, or oxidation; and v. any and all other spent potliner materials, including said sulfur compounds, are either substantially completely melted to form slag, or gasified, pyrolized, dissociated, or oxidized; with the result that said hazardous solid spent potliner material from aluminum reduction cells is rendered non-hazardous, and the remaining slag has both its solid volume and mass substantially reduced relative to the mass and volume of the input solid spent potliner material, thereby avoiding many of the equipment and operating complexities associated with the non-plasma torch combustion or incineration of spent potliner.
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