NO123158B - - Google Patents

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Publication number
NO123158B
NO123158B NO0870/69A NO87069A NO123158B NO 123158 B NO123158 B NO 123158B NO 0870/69 A NO0870/69 A NO 0870/69A NO 87069 A NO87069 A NO 87069A NO 123158 B NO123158 B NO 123158B
Authority
NO
Norway
Prior art keywords
lime
preheating
coke
limestone
carbide
Prior art date
Application number
NO0870/69A
Other languages
Norwegian (no)
Inventor
W Moore
W Gruver
Original Assignee
Meehanite Metal Corp
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 Meehanite Metal Corp filed Critical Meehanite Metal Corp
Publication of NO123158B publication Critical patent/NO123158B/no

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Classifications

    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06BFIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B7/00Special arrangements or measures in connection with doors or windows
    • E06B7/16Sealing arrangements on wings or parts co-operating with the wings
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/04Cast-iron alloys containing spheroidal graphite
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/10Cast-iron alloys containing aluminium or silicon
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05CBOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C19/00Other devices specially designed for securing wings, e.g. with suction cups
    • E05C19/16Devices holding the wing by magnetic or electromagnetic attraction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Manufacture Of Iron (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Description

Fremgangsmåte ved fremstilling av kalsiumkarbid. Method for the production of calcium carbide.

Ved de vanlige prosesser for forvarming By the usual processes for preheating

av beskikning til elektriske smelteovner for smeltning av rujern, ferrolegeringer, karbid o. 1. er man utsatt for at det faste reduk-sjonsmiddel oksyderes i forvarmningsan-legget av de varme gasser. Oksydasjonen medfører tap av reduksjonsmateriale slik at det må tilsettes mer reduksjonsmateri-aler i selve smelteovnen. På denne måten blir verdien av den kraftmengden som spa- of coating to electric melting furnaces for melting pig iron, ferroalloys, carbide etc. 1. one is exposed to the solid reducing agent being oxidized in the preheating system by the hot gases. The oxidation causes a loss of reducing material so that more reducing material must be added in the melting furnace itself. In this way, the value of the amount of power that spa-

res ved forbehandlingen mer eller mindre utlignet. res during the pre-treatment more or less equalised.

Ifølge oppfinnelsen kan koksen beskyt- According to the invention, the coke can protect

tes mot forbrenning ved at man gir den et overtrekk av en kalsiumforbindelse, for-trinnsvis kalkhydrat. Overtrekkingen kan utføres ved at man blander koksen med kalkhydrat, f. eks. kalkslam fra fremstilling av acetylen. Om nødvendig kan kalklaget herdes, f. eks. ved behandling med CO2-holdige gasser. Belegget blir da meget sterkt. against burning by giving it a coating of a calcium compound, preferably lime hydrate. The coating can be carried out by mixing the coke with hydrated lime, e.g. lime sludge from the production of acetylene. If necessary, the lime layer can be hardened, e.g. when treated with CO2-containing gases. The coating then becomes very strong.

Eventuelt kan belegget også bestå av andre kalsiumforbindelser som kalk eller kalksten. Man må da anvende et binde-middel. Optionally, the coating may also consist of other calcium compounds such as lime or limestone. You must then use a binding agent.

Ved anvendelse av slik beskyttet koks, kan man uten fare for avbrenning av kull-stoffet, drive forvarmingen til så høy temperatur, (ca. 8—900° C), at eventuell kalksten i chargen brennes helt eller delvis før chargen når smelteovnen. When using such protected coke, the preheating can be run to such a high temperature (approx. 8-900° C) that any limestone in the charge is completely or partially burned before the charge reaches the melting furnace, without danger of burning the coal.

Kalsiumkarbid fremstilles som kjent normalt ved smeltning av brent kalk med koks. Ved anvendelse av den beskrevne me-tode, vil man helt eller delvis kunne er-statte den brente kalk med kalksten. Der-ved spares den separate kalkbrenning som er kostbar både i installasjon og drift. Ved den beskrevne direkte fremstilling av karbid ut fra koks og ubrent kalksten kan oppnåes ytterligere besparelser hvis man som nevnt ovenfor anvender for overtrekkingen det kalkhydrat som dannes ved spaltning av karbid med vann ved produk-sjon av acetylen. En del kalk vil da altså sirkulere gjennom ovnen. As is known, calcium carbide is normally produced by melting quicklime with coke. By using the described method, it will be possible to completely or partially replace the burnt lime with limestone. Thereby, the separate burning of lime is saved, which is expensive both in installation and operation. In the described direct production of carbide from coke and unburnt limestone, further savings can be achieved if, as mentioned above, the lime hydrate formed by splitting carbide with water in the production of acetylene is used for the coating. Some lime will therefore circulate through the oven.

Kalkhydratslammet fra acetylenfrem-stillingen er nå et avfallsprodukt som det volder karbidindustrien store vanskelighe- The lime hydrate sludge from acetylene production is now a waste product which causes great difficulties for the carbide industry.

ter å bli kvitt. Man har forsøkt å brikettere det og returnere det til karbidovnen. Dette blir imidlertid dyrt og slike metoder er hittil bare anvendt i liten målestokk. ter to get rid of. Attempts have been made to briquette it and return it to the carbide furnace. However, this becomes expensive and such methods have so far only been used on a small scale.

Ved anvendelse av kalkhydratslam til overtrekking av koksen er det imidlertid en fare for at sirkulasjon av for meget kalk vil medføre en akkumulering av for-urensningene i karbiden. Man bør derfor begrense mengden av kalkhydrat slik at en vesentlig kvalitetsforringelse av karbiden unngåes. When lime hydrate sludge is used to coat the coke, however, there is a danger that circulation of too much lime will lead to an accumulation of impurities in the carbide. One should therefore limit the amount of lime hydrate so that a significant deterioration in the quality of the carbide is avoided.

Man får gunstigere forhold ved å anvende ca. 30—60 pst. av den nødvendige kalkmengde i form av kalkhydratovertrekk på koksen. Den nødvendige tilsats av ny kalk blir da 40—70 pst. av den nødvendige kalkmengde. Dette kan eventuelt helt el- You get more favorable conditions by using approx. 30-60 per cent of the required amount of lime in the form of lime hydrate coating on the coke. The necessary addition of new lime is then 40-70 per cent of the required amount of lime. This can possibly be entirely e-

ler delvis tilsettes som kalksten. clay is partly added as limestone.

Et tynt men meget tett og sterkt be-legg kan oppnås ved behandling av reduk-sjonsmidlet med kalkhydrat og/eller fin-pulverisert kalkstein i en blandetrommel, A thin but very dense and strong coating can be achieved by treating the reducing agent with lime hydrate and/or finely powdered limestone in a mixing drum,

f. eks. en alminnelig betongblander. Man kan også anvende en pelletiserings-trommel eller tallerken. Etter en tids lagring i luft, karboniseres kalken og belegget herdner til et hårdt skall. e.g. an ordinary concrete mixer. A pelletizing drum or plate can also be used. After a period of storage in air, the lime is carbonized and the coating hardens into a hard shell.

Ved anvendelse av overtrukket koks When using coated coke

økes den elektriske motstand i chargen the electrical resistance in the charge is increased

sterkt slik at man kan kjøre med høyere strongly so that you can drive with higher

ovnsspenning. Herved økes produksjonen, furnace voltage. This increases production,

og de elektriske forhold i ovnen bedres vesentlig slik at ovnsstørrelsen kan økes. and the electrical conditions in the oven are significantly improved so that the size of the oven can be increased.

Metoden kan anvendes både ved forvarming i separat ovn og ved forvarming i The method can be used both for preheating in a separate oven and for preheating in

selve ovnssjaktene. the furnace shafts themselves.

Claims (3)

1. Fremgangsmåte til fremstilling av1. Method for the production of kalsiumkarbid av kalk og koks i elektrisk ovn under forvarming av chargen, karak- terisert ved at hvert enkelt koksstykke før forvarmingen blir belagt med en kalsiumforbindelse som f. eks. kalk, kalkstein eller kalkhydrat for å unngå oksydasjon av koksen under forvarmingen. calcium carbide from lime and coke in an electric furnace while preheating the charge, characterized by the fact that each individual piece of coke before the preheating is coated with a calcium compound such as lime, limestone or lime hydrate to avoid oxidation of the coke during preheating. 2. Fremgangsmåte som i påstand 1, karakterisert ved at forvarmingen drives til så høy temperatur at eventuell kalkstein i chargen brennes før den når smelteovnen. 2. Method as in claim 1, characterized in that the preheating is operated to such a high temperature that any limestone in the charge is burnt before it reaches the smelting furnace. 3. Fremgangsmåte som i påstand 1, karakterisert ved at 30—60 pst. av den nød-vendige kalkmengde innføres som kalk-hydratbelgg mens resten innføres som kalk eller kalkstein.3. Method as in claim 1, characterized in that 30-60 per cent of the necessary amount of lime is introduced as lime hydrate pods while the rest is introduced as lime or limestone.
NO0870/69A 1968-03-11 1969-02-28 NO123158B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71218868A 1968-03-11 1968-03-11

Publications (1)

Publication Number Publication Date
NO123158B true NO123158B (en) 1971-10-04

Family

ID=24861100

Family Applications (1)

Application Number Title Priority Date Filing Date
NO0870/69A NO123158B (en) 1968-03-11 1969-02-28

Country Status (12)

Country Link
US (1) US3600159A (en)
BE (1) BE722918A (en)
CH (1) CH513985A (en)
DE (1) DE1911552B2 (en)
DK (1) DK120462B (en)
ES (1) ES359978A1 (en)
FI (1) FI50256C (en)
FR (1) FR1603522A (en)
GB (1) GB1196550A (en)
NL (1) NL149545B (en)
NO (1) NO123158B (en)
SE (1) SE338442B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5343126B2 (en) * 1972-12-16 1978-11-17
DE3147461C2 (en) 1981-12-01 1983-10-13 Goetze Ag, 5093 Burscheid Wear-resistant cast iron alloy of high strength with spherulitic graphite precipitation, its manufacturing process and its use
JPS60500217A (en) * 1983-01-24 1985-02-21 フオ−ド モ−タ− カンパニ− Method of manufacturing ductile iron with improved strength
US4484953A (en) * 1983-01-24 1984-11-27 Ford Motor Company Method of making ductile cast iron with improved strength
BR9200615A (en) * 1992-02-18 1993-08-24 Cofap NODULAR CAST IRON AND PROCESS OF OBTAINING NODULAR CAST IRON
US6342181B1 (en) 2000-03-17 2002-01-29 The Curators Of The University Of Missouri Corrosion resistant nickel-based alloy
JP3936849B2 (en) * 2001-05-16 2007-06-27 スズキ株式会社 Ferrite-based spheroidal graphite cast iron and exhaust system parts using the same
CN102688993B (en) * 2012-06-19 2015-02-25 西峡县众德汽车部件有限公司 Application of Sb element in high-strength nodular cast iron tile cover

Also Published As

Publication number Publication date
US3600159A (en) 1971-08-17
NL6902042A (en) 1969-09-15
FI50256B (en) 1975-09-30
GB1196550A (en) 1970-06-24
DE1911552A1 (en) 1969-10-09
DE1911552B2 (en) 1977-03-24
BE722918A (en) 1969-04-01
NL149545B (en) 1976-05-17
FI50256C (en) 1976-01-12
CH513985A (en) 1971-10-15
ES359978A1 (en) 1970-10-01
FR1603522A (en) 1971-05-03
DK120462B (en) 1971-06-01
SE338442B (en) 1971-09-06

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