EP0025417B1 - Einschlagvorrichtung zum Brechen der erstarrten kruste eines Elektrolyseofens - Google Patents

Einschlagvorrichtung zum Brechen der erstarrten kruste eines Elektrolyseofens Download PDF

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Publication number
EP0025417B1
EP0025417B1 EP80810284A EP80810284A EP0025417B1 EP 0025417 B1 EP0025417 B1 EP 0025417B1 EP 80810284 A EP80810284 A EP 80810284A EP 80810284 A EP80810284 A EP 80810284A EP 0025417 B1 EP0025417 B1 EP 0025417B1
Authority
EP
European Patent Office
Prior art keywords
chisel
crust
breaking device
recess
bottom face
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
Application number
EP80810284A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0025417A1 (de
Inventor
Thomas Haggenmacher
Edwin Gut
Hans Friedli
Gottfried Maugweiler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rio Tinto Switzerland AG
Original Assignee
Schweizerische Aluminium AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schweizerische Aluminium AG filed Critical Schweizerische Aluminium AG
Priority to AT80810284T priority Critical patent/ATE1824T1/de
Publication of EP0025417A1 publication Critical patent/EP0025417A1/de
Application granted granted Critical
Publication of EP0025417B1 publication Critical patent/EP0025417B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/02—Percussive tool bits
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/14—Devices for feeding or crust breaking

Definitions

  • the present invention relates to an impact device for breaking the solidified crust of an electrolysis furnace by means of a chisel, in particular for the production of aluminum.
  • the electrolyte becomes poor in aluminum oxide.
  • aluminum oxide in the electrolyte there is an anode effect, which results in a voltage increase of, for example, 4 to 4.5 V to 30 V and above.
  • the crust must be hammered in and the aluminum oxide concentration increased by adding new aluminum oxide (alumina).
  • the cell is usually operated periodically in molar operation, even if there is no anode effect.
  • the bath crust has to be hammered in and the alumina concentration increased by adding new aluminum oxide, which corresponds to a cell operation.
  • the inventors have therefore set themselves the task of creating an impact device for breaking the solidified crust of an electrolysis furnace by means of a chisel, in which the force required for impact is considerably reduced.
  • the object is achieved in that at least parts of the edge region of the chisel underside protrude beyond the remaining areas and are formed as punched edges, and that the chisel underside has no outwardly inclined surfaces which cause outward side forces when the crust is pierced.
  • this acts like a punching or shearing tool when the electrolyte crust is hammered in.
  • the lower expenditure of force for perforating the crust reduces the expenditure of energy and on the other hand allows the use of less massive impact devices, which also makes it possible to keep the investments lower.
  • the chisels are made of common material, preferably St 45-50, a hard and weldable steel.
  • cross or point control are chisels with elongated rectangles in cross-section, e.g. B. 150 x40 mm, particularly cheap because when converting existing furnaces, the anode distance in the longitudinal axis of the furnace (central control) or transverse axis of the furnace (transverse control) does not have to be changed or only to a minor extent.
  • conical, frustoconical or dome-shaped recesses are preferred for chisels with a round cross section, and wedge-shaped recesses for chisels with a rectangular cross section.
  • the impact device which in principle consists of a pressure cylinder, piston rod and chisel, is attached directly or indirectly to the cell structure or is part of an operating vehicle or furnace manipulator.
  • a cylindrical chisel 10 which has a conical recess 12 instead of a flat lower end face.
  • the outer surface of this conical recess 12 and the outer surface of the cylinder 10 form a circular sectional surface which is visible from below and which represents the punched surface.
  • the surface lines of the conical recess 12 form an angle ⁇ with the horizontal, which is preferably in the range of 15-45 °. At smaller angles, the effect of the chisel used as a punching tool decreases increasingly, larger angles than 45 ° are increasingly uninteresting for economic and mechanical reasons.
  • the outer surface 14 of the truncated cone acts in the same way as the outer surface 12 of the cone of FIG. 1.
  • the horizontal surface 16 only exercises it the force below does not work until the chisel has already been pushed a little into the crust.
  • FIG. 5 and 6 show a chisel 18 which is rectangular in cross section and which has a wedge-shaped recess 20 instead of a horizontal, flat end face.
  • the recessed triangular part in the sectional plane of FIG. 5 can also be trapezoidal in a variant not shown, similar to that in FIG. 3.
  • FIG. 1 An embodiment variant of the punched edge is shown in an enlarged scale in FIG.
  • the recess regardless of whether it is conical or wedge-shaped, initially runs at a steeper angle 22 and then merges into a flatter angle 24.
  • This has the advantage that the chisel can be punched into the crust with less force.
  • only very hard and wear-resistant chisel material is suitable for this variant.
  • FIG. 1 A further embodiment variant of the punched edge of the chisel is shown in FIG.
  • the recess does not begin at the circumference of the chisel, but is slightly indented, as a result of which a horizontal surface 26 is formed in the edge region.
  • the recess 28 follows on the inside of this horizontal surface, preferably with the values given above for ( X. In this embodiment of the chisel, more force has to be applied when the crust is pressed in during the initial phase, but the wear on the chisel material is less.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Materials For Medical Uses (AREA)
  • Organic Insulating Materials (AREA)
  • Discharge Heating (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Shovels (AREA)
  • Crushing And Grinding (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
  • Conductive Materials (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP80810284A 1979-09-10 1980-09-09 Einschlagvorrichtung zum Brechen der erstarrten kruste eines Elektrolyseofens Expired EP0025417B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80810284T ATE1824T1 (de) 1979-09-10 1980-09-09 Einschlagvorrichtung zum brechen der erstarrten kruste eines elektrolyseofens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH815079 1979-09-10
CH8150/79 1979-09-10

Publications (2)

Publication Number Publication Date
EP0025417A1 EP0025417A1 (de) 1981-03-18
EP0025417B1 true EP0025417B1 (de) 1982-11-17

Family

ID=4335924

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80810284A Expired EP0025417B1 (de) 1979-09-10 1980-09-09 Einschlagvorrichtung zum Brechen der erstarrten kruste eines Elektrolyseofens

Country Status (14)

Country Link
US (1) US4416489A (cs)
EP (1) EP0025417B1 (cs)
JP (1) JPS5647581A (cs)
AT (1) ATE1824T1 (cs)
AU (1) AU539637B2 (cs)
CA (1) CA1150188A (cs)
DE (2) DE2943292A1 (cs)
ES (1) ES258161Y (cs)
GR (1) GR69697B (cs)
IS (1) IS1172B6 (cs)
NO (1) NO154434C (cs)
NZ (1) NZ194873A (cs)
YU (1) YU230980A (cs)
ZA (1) ZA805337B (cs)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH644156A5 (de) * 1979-09-10 1984-07-13 Alusuisse Vorrichtung zur bedienung von elektrolyseoefen.
JPH0664610B2 (ja) * 1987-10-12 1994-08-22 工業技術院長 アフィン逆変換による図形パターンの姿勢角・位置の計測法
WO1997011818A1 (de) * 1995-09-29 1997-04-03 Bodo Hoppe Hammer
US5873423A (en) * 1997-07-31 1999-02-23 Briese Industrial Technologies, Inc. Frustum cutting bit arrangement

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US560500A (en) * 1896-05-19 Rock-drill
US1174433A (en) * 1913-05-13 1916-03-07 Thomas D Mowlds Stone-channeling tool.
US1880623A (en) * 1930-03-15 1932-10-04 Ingersoll Rand Co Broaching tool
US2423787A (en) * 1944-11-01 1947-07-08 Aluminum Co Of America Crust breaking apparatus
NL129766C (cs) * 1962-09-14
AT237909B (de) * 1962-12-07 1965-01-11 Vmw Ranshofen Berndorf Ag Elektropneumatische Vorrichtung zur automatischen periodischen Tonerdezugabe bei Aluminiumelektrolyseöfen
US3319899A (en) * 1963-03-04 1967-05-16 Alcan Aluminium Ltd Crust breaking device for electrolysis furnaces
CH496100A (de) * 1967-04-07 1970-09-15 Alusuisse Verfahren und Vorrichtung zum Betreiben eines Ofens für die schmelzelektrolytische Gewinnung von Aluminium
BE757943A (fr) * 1969-10-24 1971-04-01 Alusuisse Machine mobile pour le service des cuves d'electrolyse
US3681229A (en) 1970-07-17 1972-08-01 Aluminum Co Of America Alumina feeder
US4280573A (en) * 1979-06-13 1981-07-28 Sudnishnikov Boris V Rock-breaking tool for percussive-action machines

Also Published As

Publication number Publication date
NZ194873A (en) 1984-12-14
EP0025417A1 (de) 1981-03-18
US4416489A (en) 1983-11-22
ES258161U (es) 1981-11-16
NO154434C (no) 1986-09-17
YU230980A (en) 1983-02-28
AU539637B2 (en) 1984-10-11
ATE1824T1 (de) 1982-12-15
ES258161Y (es) 1982-05-16
ZA805337B (en) 1981-09-30
AU6211080A (en) 1981-03-19
GR69697B (cs) 1982-07-08
IS2582A7 (is) 1981-03-11
CA1150188A (en) 1983-07-19
DE3061110D1 (en) 1982-12-23
DE2943292A1 (de) 1981-03-19
NO802644L (no) 1981-03-11
JPS5647581A (en) 1981-04-30
NO154434B (no) 1986-06-09
IS1172B6 (is) 1984-12-28

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