GB775380A - Improvements in or relating to exothermic mixtures - Google Patents

Improvements in or relating to exothermic mixtures

Info

Publication number
GB775380A
GB775380A GB30520/54A GB3052054A GB775380A GB 775380 A GB775380 A GB 775380A GB 30520/54 A GB30520/54 A GB 30520/54A GB 3052054 A GB3052054 A GB 3052054A GB 775380 A GB775380 A GB 775380A
Authority
GB
United Kingdom
Prior art keywords
mixture
per cent
aluminium
sleeve
self
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
GB30520/54A
Inventor
David Valentine Atterton
Francis Walter Pursall
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.)
Foundry Services Ltd
Original Assignee
Foundry Services 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 Foundry Services Ltd filed Critical Foundry Services Ltd
Priority to GB30520/54A priority Critical patent/GB775380A/en
Publication of GB775380A publication Critical patent/GB775380A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/06—Dry methods smelting of sulfides or formation of mattes by carbides or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • B22C1/08—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for decreasing shrinkage of the mould, e.g. for investment casting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/04—Dry methods smelting of sulfides or formation of mattes by aluminium, other metals or silicon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24V—COLLECTION, PRODUCTION OR USE OF HEAT NOT OTHERWISE PROVIDED FOR
    • F24V30/00—Apparatus or devices using heat produced by exothermal chemical reactions other than combustion

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Cookers (AREA)

Abstract

An exothermic mixture comprises aluminium, an amount of oxidizing agent well below that needed to completely oxidize the aluminium, 1-10 per cent by weight of a fluoride to facilitate burning of the aluminium and lowering the temperature at which reaction starts, and a small quantity of alkali aluminate sufficient when moistened to set up a reaction with the free aluminium in the mixture. When the mixture is moulded with water into a sleeve or other shape, sufficient heat is generated to dry off the mixture and render the sleeve &c. self-drying. The alkali aluminate may be sodium aluminate in an amount between 0.5 and 1.5 per cent by weight of the mixture, and it may be added to the mixture before moistening or to the water used for moulding. The time delay before the self-drying action commences may be increased by the addition of small quantities of an acidic material such as boric acid, or according to the Provisional Specification, of base metals e.g. up to 5 per cent magnesium powder, with or without 0.01-0.25 per cent of salts of noble metals, e.g. copper sulphate. Specification 627,678 is referred to.
GB30520/54A 1954-10-22 1954-10-22 Improvements in or relating to exothermic mixtures Expired GB775380A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB30520/54A GB775380A (en) 1954-10-22 1954-10-22 Improvements in or relating to exothermic mixtures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB30520/54A GB775380A (en) 1954-10-22 1954-10-22 Improvements in or relating to exothermic mixtures

Publications (1)

Publication Number Publication Date
GB775380A true GB775380A (en) 1957-05-22

Family

ID=10308950

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30520/54A Expired GB775380A (en) 1954-10-22 1954-10-22 Improvements in or relating to exothermic mixtures

Country Status (1)

Country Link
GB (1) GB775380A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001971A1 (en) * 1980-01-19 1981-07-23 Foseco Int Self drying aluminium-containing compositions
JPH04123841A (en) * 1990-09-14 1992-04-23 Masamitsu Miki Production of exothermic neck-down core and exothermic neck-down core
JPH04123843A (en) * 1990-09-14 1992-04-23 Masamitsu Miki Formation of exothermic material for casting
US5285798A (en) * 1991-06-28 1994-02-15 R. J. Reynolds Tobacco Company Tobacco smoking article with electrochemical heat source
US5538020A (en) * 1991-06-28 1996-07-23 R. J. Reynolds Tobacco Company Electrochemical heat source

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001971A1 (en) * 1980-01-19 1981-07-23 Foseco Int Self drying aluminium-containing compositions
JPH04123841A (en) * 1990-09-14 1992-04-23 Masamitsu Miki Production of exothermic neck-down core and exothermic neck-down core
JPH04123843A (en) * 1990-09-14 1992-04-23 Masamitsu Miki Formation of exothermic material for casting
JPH0763799B2 (en) 1990-09-14 1995-07-12 正光 三木 Manufacturing method of pyrogenic neck-down core
JPH0763800B2 (en) 1990-09-14 1995-07-12 正光 三木 Molding method for heat-generating materials for castings
US5285798A (en) * 1991-06-28 1994-02-15 R. J. Reynolds Tobacco Company Tobacco smoking article with electrochemical heat source
US5357984A (en) * 1991-06-28 1994-10-25 R. J. Reynolds Tobacco Company Method of forming an electrochemical heat source
US5538020A (en) * 1991-06-28 1996-07-23 R. J. Reynolds Tobacco Company Electrochemical heat source
US5593792A (en) * 1991-06-28 1997-01-14 R. J. Reynolds Tobacco Company Electrochemical heat source

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