GB813834A - Recovery of fluoride material from used aluminum reduction cell lining - Google Patents
Recovery of fluoride material from used aluminum reduction cell liningInfo
- Publication number
- GB813834A GB813834A GB29194/55A GB2919455A GB813834A GB 813834 A GB813834 A GB 813834A GB 29194/55 A GB29194/55 A GB 29194/55A GB 2919455 A GB2919455 A GB 2919455A GB 813834 A GB813834 A GB 813834A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sodium
- lining
- cell lining
- reduction cell
- materials
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/48—Halides, with or without other cations besides aluminium
- C01F7/50—Fluorides
- C01F7/54—Double compounds containing both aluminium and alkali metals or alkaline-earth metals
Abstract
<PICT:0813834/III/1> Cryolite and/or sodium fluoride and, if desired, sodium metal are recovered from aluminium reduction cell linings by heating at at least 1000 DEG C. at a suitable pressure, and condensing said materials from the resulting vapour. Preferred temperature ranges are 1050 DEG to 1300 DEG C. and pressures of 0.001 to 0.1 atms. and higher are referred to. The reduction cell lining may consist of the inner carbon lining and/or an outer lining of alumina, insulating brick or magnesia, but when siliceous materials are used they are preferably mixed with the carbon lining; the materials need not be finely ground but often need only be roughly crushed. In the illustrated apparatus the cell lining material is placed in an evaporator 11, preferably of stainless steel which is arranged in the bottom of a vessel comprising an inner shell 10, also preferably made of steel though graphite is satisfactory, and an insulating outer layer 15 of zirconia or other refractory. The cell lining material is heated to the desired temperature by a high frequency current in water-cooled coil 19 or by direct passage of a current between electrodes in the material or by burning fuel around the evaporator. The vessel is connected at the top to a head chamber 16 having a connection to a vacuum pump, and baffles 20 and 21, respectively having a ring of holes and a central hole, are provided to assist condensation. The condensate may be removed by mechanical scraping, for which devices may be provided and if desired, the process may be made continuous by the provision of pressure locks for the addition and withdrawal of material. The apparatus shown can have an inside diameter of 3.5 ins. and a height of 18 or 28 ins. The fluoride compounds and sodium are separately collected, e.g. at 24 and 25 respectively, and it is stated to be generally desirable to keep the temperature of the condenser where the vapour contains only sodium at above 98 DEG C., the melting point of sodium. Examples are given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US463214A US2858198A (en) | 1954-10-19 | 1954-10-19 | Recovery of material from aluminum reduction cell lining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB813834A true GB813834A (en) | 1959-05-27 |
Family
ID=23839305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29194/55A Expired GB813834A (en) | 1954-10-19 | 1955-10-13 | Recovery of fluoride material from used aluminum reduction cell lining |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2858198A (en) |
| DE (1) | DE1065625B (en) |
| FR (1) | FR1137666A (en) |
| GB (1) | GB813834A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106423578A (en) * | 2016-09-21 | 2017-02-22 | 红河学院 | Method for separating elements in defluorination spent potlining distillation residues through flotation method |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3114611A (en) * | 1959-06-04 | 1963-12-17 | Nat Distillers Chem Corp | Apparatus for refining metal chlorides in molten salts |
| FR1271252A (en) * | 1960-07-29 | 1961-09-08 | Electrochimie Soc | Pyrohydrolysis process |
| FR1272119A (en) * | 1960-08-10 | 1961-09-22 | Electrochimie Soc | Fluorine recovery process |
| US3151934A (en) * | 1961-06-12 | 1964-10-06 | Kaiser Aluminium Chem Corp | Method of recovering lithium values |
| US4597953A (en) * | 1985-02-20 | 1986-07-01 | Aluminum Company Of America | Halogen recovery |
| US4889695A (en) * | 1985-02-20 | 1989-12-26 | Aluminum Company Of America | Reclaiming spent potlining |
| US5558847A (en) * | 1991-02-05 | 1996-09-24 | Kaaber; Henning | Process for recovering aluminium and fluorine from fluorine containing waste materials |
| DE102009042449A1 (en) * | 2009-09-23 | 2011-03-31 | Sgl Carbon Se | Process and reactor for the treatment of carbonaceous bulk material |
| US20110081284A1 (en) * | 2009-10-02 | 2011-04-07 | Mark Weaver | Treatment of bauxite residue and spent pot lining |
| CN105088274B (en) * | 2015-08-24 | 2017-06-16 | 沈阳北冶冶金科技有限公司 | A kind of device for processing and reclaiming aluminium electroloysis solid waste |
| WO2017031798A1 (en) * | 2015-08-24 | 2017-03-02 | 沈阳北冶冶金科技有限公司 | Apparatus for treating and recycling aluminum electrolysis solid waste |
| CN106868246B (en) * | 2017-03-21 | 2019-01-04 | 山东南山铝业股份有限公司 | A kind of phosphorous pig iron carbon increasing sulfur method |
| WO2018175753A1 (en) * | 2017-03-22 | 2018-09-27 | University Of Delaware | Centrifugal evaporation sources |
| CN108275684B (en) * | 2017-05-19 | 2022-07-26 | 上海彭浦特种耐火材料厂有限公司 | Method for recycling waste silicon nitride combined silicon carbide brick produced by aluminum electrolytic cell |
| CN109127655B (en) * | 2018-08-01 | 2021-05-07 | 湘潭大学 | Method and system for converting sodium-containing and fluorine-containing compounds in aluminum electrolysis waste carbon slag |
| CN109047285B (en) * | 2018-08-01 | 2021-05-07 | 湘潭大学 | Method and system for converting sodium-containing and fluorine-containing compounds in waste cathode carbon blocks of aluminum electrolytic cell |
| CN109108050B (en) * | 2018-08-01 | 2021-05-07 | 湘潭大学 | Method and system for converting sodium-containing and fluorine-containing compounds in aluminum electrolysis overhaul residues |
| CN209027266U (en) * | 2018-09-29 | 2019-06-25 | 沈阳北冶冶金科技有限公司 | A kind of device of aluminium electroloysis solid waste separation and recovery and petroleum coke high temperature desulfurizing |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2117497A (en) * | 1937-08-27 | 1938-05-17 | Dow Chemical Co | Method of purifying carbon or graphite |
| US2260746A (en) * | 1938-09-02 | 1941-10-28 | Dow Chemical Co | Method of treating carbon or graphite |
| US2624698A (en) * | 1947-09-08 | 1953-01-06 | Great Lakes Carbon Corp | Method of producing a purified coke |
| US2732283A (en) * | 1951-02-23 | 1956-01-24 | O minutes |
-
0
- DE DENDAT1065625D patent/DE1065625B/en active Pending
-
1954
- 1954-10-19 US US463214A patent/US2858198A/en not_active Expired - Lifetime
-
1955
- 1955-10-13 GB GB29194/55A patent/GB813834A/en not_active Expired
- 1955-10-18 FR FR1137666D patent/FR1137666A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106423578A (en) * | 2016-09-21 | 2017-02-22 | 红河学院 | Method for separating elements in defluorination spent potlining distillation residues through flotation method |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1065625B (en) | 1959-09-17 |
| FR1137666A (en) | 1957-06-03 |
| US2858198A (en) | 1958-10-28 |
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