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GB598146A - Removal of impurities from graphite electrodes - Google Patents

Removal of impurities from graphite electrodes

Info

Publication number
GB598146A
GB598146A GB22450/45A GB2245045A GB598146A GB 598146 A GB598146 A GB 598146A GB 22450/45 A GB22450/45 A GB 22450/45A GB 2245045 A GB2245045 A GB 2245045A GB 598146 A GB598146 A GB 598146A
Authority
GB
United Kingdom
Prior art keywords
solution
acid
rubber
impurities
hypochlorous acid
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
GB22450/45A
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of GB598146A publication Critical patent/GB598146A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H01J19/30—Non-electron-emitting electrodes; Screens characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • C25B11/042—Electrodes formed of a single material
    • C25B11/043—Carbon, e.g. diamond or graphene
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/002—Chemical composition and manufacture chemical
    • H01J2893/0021—Chemical composition and manufacture chemical carbon

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

Metallic impurities are removed from graphite electrodes by treating them with an aqueous solution of an acid such as hydrochloric acid and an oxidising agent such as hypochlorous acid or chlorine at temperatures up to the boiling point of the solution. If hypochlorous acid is used, periodic additions of sodium hypochlorite may be made to maintain the necessary concentration. Electrodes are placed on graphite or wooden strips in a rubber-lined steel tank, water and hydrochloric acid are added in amounts to give a 1 per cent. solution and sodium hypochlorite is added to produce a saturated solution of hypochlorous acid. Steam may be introduced and the solution circulated through rubber pipes and pump. A rubber vent pipe is provided in the tank cover which fits into a gas seal. Impurities removed are aluminium, iron, magnesium, titanium, nickel, chromium, vanadium, calcium and compounds such as oxides thereof. Specifications 366,973 and 542,363 are referred to.
GB22450/45A 1944-09-01 1945-08-31 Removal of impurities from graphite electrodes Expired GB598146A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA598146X 1944-09-01

Publications (1)

Publication Number Publication Date
GB598146A true GB598146A (en) 1948-02-11

Family

ID=4171906

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22450/45A Expired GB598146A (en) 1944-09-01 1945-08-31 Removal of impurities from graphite electrodes

Country Status (1)

Country Link
GB (1) GB598146A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914383A (en) * 1951-11-16 1959-11-24 Graphitwerk Kropfmuhl Ag Process of purifying graphite

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914383A (en) * 1951-11-16 1959-11-24 Graphitwerk Kropfmuhl Ag Process of purifying graphite

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