SK1522002A3 - Method of making a storage block for an electrical night-storage heating device and a storage block made by this method - Google Patents

Method of making a storage block for an electrical night-storage heating device and a storage block made by this method Download PDF

Info

Publication number
SK1522002A3
SK1522002A3 SK152-2002A SK1522002A SK1522002A3 SK 1522002 A3 SK1522002 A3 SK 1522002A3 SK 1522002 A SK1522002 A SK 1522002A SK 1522002 A3 SK1522002 A3 SK 1522002A3
Authority
SK
Slovakia
Prior art keywords
iron
binder
storage
iron scales
range
Prior art date
Application number
SK152-2002A
Other languages
Slovak (sk)
Inventor
Lutz Asperger
Helmut Bareuther
Original Assignee
Kulmbacher Klimageraete
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 Kulmbacher Klimageraete filed Critical Kulmbacher Klimageraete
Publication of SK1522002A3 publication Critical patent/SK1522002A3/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0056—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
    • 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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
    • F24H7/002—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release using electrical energy supply
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Resistance Heating (AREA)
  • Soft Magnetic Materials (AREA)
  • Mold Materials And Core Materials (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

Production of a storage stone comprises: (i) preparing an iron scale having a prescribed particle distribution; (ii) mixing with a binder; and (iii) molding a stone from the mixture produced. An Independent claim is also included for a storage stone produced containing more than 50% iron scale. Preferred Features: The iron scale is de-oiled in the first step. The binder is ceramic. The storage stone contains 85-99 wt.% iron scale and 1-15 wt.% binder.

Description

Oblasť technikyTechnical field

Vynález sa týka spôsobu výroby akumulačného bloku pre elektrické akumulačné vykurovacie zariadenie a akumulačného bloku vyrobeného týmto spôsobom.The present invention relates to a method for manufacturing an accumulation block for an electric storage heating device and an accumulation block made by this method.

Doterajší stav technikyBACKGROUND OF THE INVENTION

Akumulačné bloky sa v jadrách elektrických akumulačných vykurovacích zariadení používajú na akumuláciu tepelnej energie. Tepelná energia vyvíjaná vykurovacími odpormi, ktoré sú umiestnené v akumulačnom jadre, sa ukladá do akumulačných blokov a následne sa vydáva prostredníctvom vzduchu, ktorý je vedený okolo akumulačných blokov. Akumulačné bloky by mali mať maximálne vysokú akumulačnú kapacitu pri malom objeme. V súčasnosti sa na výrobu akumulačných blokov používajú minerály, napríklad magnezit (MgO) alebo magnetit (Fe2O4).Accumulation blocks are used in the cores of electrical storage heating devices to store thermal energy. The thermal energy generated by the heating resistors located in the storage core is stored in the storage blocks and then discharged via air that is guided around the storage blocks. The accumulation blocks should have a maximum high storage capacity at a small volume. At present, minerals such as magnesite (MgO) or magnetite (Fe 2 O 4) are used to produce storage blocks.

Úlohou vynálezu je hospodárna výroba akumulačných blokov pre elektrická akumulačné vykurovacie zariadenie z alternatívnych materiálov.SUMMARY OF THE INVENTION It is an object of the invention to economically manufacture storage blocks for an electric storage heating device from alternative materials.

Podstata vynálezuSUMMARY OF THE INVENTION

Uvedenú úlohu rieši a nedostatky známych riešení tohto druhu do značnej miery odstraňuje spôsob výroby akumulačného bloku pre elektrické akumulačné vykurovacie zariadenie, pri ktorom :This problem is solved and the deficiencies of known solutions of this kind are largely eliminated by the method of producing an accumulation block for an electric storage heating device, in which:

a) pripravia sa železné okoviny s vopred určeným rozložením veľkosti častíc,(a) iron scales are prepared with a predetermined particle size distribution;

b) železné okoviny sa zmiešajú so spojivom, a(b) the iron scales are mixed with a binder; and

c) z takto pripravenej zmesi sa vytvaruje akumulačný blok.c) forming an accumulation block from the mixture thus prepared.

Základnou myšlienkou vynálezu je použitie železných okovín na výrobu akumulačných blokov. Železné okoviny sú vo veľkom množstve produktom oxidácie v metalurgii železa a sú preto pomerne lacné. Pozostávajú zo zmesi oxidov železa, to je FeO, Fe3O4 a Fe2C>3. Podľa vynálezu sa pripravia železné okoviny s vopred určeným rozložením veľkosti častíc, zmiešajú sa so spojivom a z takto pripravenej zmesi sa vytvaruje akumulačný blok.The basic idea of the invention is the use of iron scales for the production of accumulation blocks. Iron scales are in large quantities a product of oxidation in iron metallurgy and are therefore relatively inexpensive. Consist of a mixture of iron oxides, that is FeO, Fe 2 O 4, and Fe3O> 3rd According to the invention, iron scales with a predetermined particle size distribution are prepared, mixed with a binder, and an accumulation block is formed into the thus prepared mixture.

Je výhodné, ak železné okoviny sa v kroku a) zbavujú oleja.Preferably, in step a), the iron scales are freed of oil.

Vopred určené rozloženie veľkosti častíc železných okovín sa výhodne dosahuje nastavením krivky preosievania. To znamená, že železné okoviny rozdrobujú, poprípade melú, a takto získané častice sa preosievajú, aby sa dosiahlo požadované rozloženie veľkosti častíc železných okovín.The predetermined particle size distribution of the iron scales is preferably achieved by adjusting the sieving curve. That is, the iron scales are comminuted or ground and the particles thus obtained are sieved to obtain the desired particle size distribution of the iron scales.

Železné okoviny majú výhodne rozloženie veľkosti častíc, v ktorom veľkosť častíc je v rozsahu 0,01 mm až 4 mm, pričom približne 40 až 50 % častíc má veľkosť v rozsahu 0,5 mm až 4 mm.The iron scales preferably have a particle size distribution in which the particle size is in the range of 0.01 mm to 4 mm, with approximately 40 to 50% of the particles having a size in the range of 0.5 mm to 4 mm.

V jednom z výhodných uskutočnení spôsobu podľa vynálezu sa v kroku b) pripravená zmes v kroku c) odlieva do formy a nechá vytvrdiť.In one preferred embodiment of the process according to the invention, in step b), the mixture prepared in step c) is cast into a mold and allowed to cure.

V alternatívnom uskutočnení spôsobu podľa vynálezu sa v kroku b) pripravená zmes v kroku c) plní do formy a lisuje.In an alternative embodiment of the process according to the invention, in step b), the prepared mixture in step c) is filled into a mold and pressed.

Zmes sa po lisovaní napríklad vypaľuje a vyberá z formy.For example, after pressing, the mixture is fired and removed from the mold.

Iná alternatíva spôsobu podľa vynálezu spočíva v tom, že takto vyrobený polotovar sa po lisovaní vyberá z formy a následne sa vypaľuje.Another alternative of the process according to the invention is that the blank thus produced is removed from the mold after pressing and subsequently fired.

Zmes alebo polotovar sa pritom vypaľujú výhodne pri teplote v rozsahu 800 až 1 000 °C.The mixture or blanks are preferably fired at a temperature in the range 800 to 1000 ° C.

Predmetom vynálezu je tiež akumulačný blok pre elektrické akumulačné vykurovacie zariadenie, predovšetkým vyrobený opísaným spôsobom, ktorý z viac ako 50 % pozostáva zo železných okovín.The invention also relates to an accumulation block for an electric storage heating device, in particular produced by the above-described process, which consists of more than 50% of iron scales.

Železné okoviny akumulačného bloku sú výhodne zbavené oleja.The iron scales of the storage block are preferably oil-free.

Akumulačný blok výhodne obsahuje spojivo, výhodne keramické spojivo.The storage block preferably comprises a binder, preferably a ceramic binder.

Akumulačný blok výhodne obsahuje 85 až 99 % hmotn. železných okovín a 1 až 15 % hmotn. spojiva.The storage block preferably contains 85 to 99 wt. % of iron scales and 1 to 15 wt. binder.

Akumulačný blok pritom výhodne obsahuje častice železných okovín s priemermi v rozsahu 0,01 mm až 4 mm, pričom 40 až 50 % železných okovín sú častice s priemermi v rozsahu 0,5 mm až 4 mm.The accumulator block preferably comprises iron scale particles with diameters in the range of 0.01 mm to 4 mm, with 40 to 50% of the iron scale being particles with diameters in the range of 0.5 mm to 4 mm.

Príklady uskutočnení vynálezuDETAILED DESCRIPTION OF THE INVENTION

Ďalej bude podrobnejšie opísaný výhodný spôsob výroby akumulačného bloku.In the following, the preferred method of manufacturing the storage block will be described in more detail.

Na výrobu akumulačného bloku sa najskôr pripravia železné okoviny a vhodné spojivo. Pokiaľ železné okoviny nemajú požadované rozloženie veľkosti častí, melú sa a/alebo vhodne preosievajú.For the production of the accumulation block, iron scales and a suitable binder are first prepared. If the iron scales do not have the desired particle size distribution, they are ground and / or suitably sieved.

Takto sa pred pridaním spojiva vyrobia železné okoviny, ktoré výhodne obsahujú častice železných okovín s priemermi v rozsahu 0,01 mm až približne 4 mm, pričom približne 40 až 50 % železných okovín sú častice s priemermi v rozsahu 0,5 mm až 4 mm. Železné okoviny sa potom intenzívne premiešajú so spojivom. Ako spojivo prichádzajú do úvahu íly, silikáty, fosfáty, napríklad monoalumíniumfosfát, a sulfáty, napríklad alumíniumsulfát. Pokiaľ je to treba, môžu sa primiešať ešte ďalšie prísady. Je výhodné, ak sa zmieša 85 až 99 % hmotn. železných okovín s 1 až 1 5 % hmotn. spojiva.Thus, prior to the addition of a binder, iron scales are produced which preferably comprise iron scarf particles with diameters in the range of 0.01 mm to about 4 mm, with about 40 to 50% of the iron scales being particles with diameters in the range of 0.5 mm to 4 mm. The iron scales are then intensively mixed with the binder. Suitable binders are clays, silicates, phosphates, for example monoaluminium phosphate, and sulfates, for example aluminum sulphate. If desired, further additives may be admixed. Preferably, 85 to 99 wt. % of iron scales with 1 to 15 wt. binder.

Surová hmota sa následne lisuje vo forme a zlisovaný polotovar sa vy paľuje pri teplote približne 800 až 1 000 °C.The crude mass is subsequently compressed in the mold and the compacted product is fired at a temperature of about 800 to 1000 ° C.

Claims (14)

PATENTOVÉ NÁROKYPATENT CLAIMS 1. Spôsob výroby akumulačného bloku pre elektrické akumulačné vykurovacie zariadenie, pri ktorom :A method for producing an accumulation block for an electrical storage heating device, wherein: a) pripravia sa železné okoviny s vopred určeným rozložením veľkosti častíc,(a) iron scales are prepared with a predetermined particle size distribution; b) železné okoviny sa zmiešajú so spojivom, a(b) the iron scales are mixed with a binder; and c) z takto pripravenej zmesi sa vytvaruje akumulačný blok.c) forming an accumulation block from the mixture thus prepared. 2. Spôsob podľa nároku 1, vyznačujúci sa tým, že železné okoviny sa v kroku a) zbavujú oleja.Method according to claim 1, characterized in that the iron scales are de-oiled in step a). 3. Spôsob podľa nároku 1 alebo 2, vyznačujúci sa tým, že vopred určené rozloženie veľkosti častíc železných okovín sa dosahuje nastavením krivky preosievania.Method according to claim 1 or 2, characterized in that the predetermined particle size distribution of the iron sheaths is achieved by adjusting the sieving curve. 4. Spôsob podľa nároku 3, vyznačujúci sa tým, že železné okoviny majú rozloženie veľkosti častíc, v ktorom veľkosť častíc je v rozsahu 0,01 mm až 4 mm, pričom približne 40 až 50 % častíc má veľkosť v rozsahu 0,5 mm až 4 mm.The method of claim 3, wherein the iron scales have a particle size distribution in which the particle size is in the range of 0.01 mm to 4 mm, wherein about 40 to 50% of the particles have a size in the range of 0.5 mm to 4 mm. 4 mm. 5. Spôsob podľa niektorého z nárokov 1 až 4, vyznačujúci sa tým, že v kroku b) pripravená zmes sa v kroku c) odlieva do formy a nechá sa vytvrdiť.Process according to any one of claims 1 to 4, characterized in that in step b) the mixture prepared in step c) is cast into a mold and allowed to cure. 6. Spôsob podľa niektorého z nárokov 1 až 4, vyznačujúci sa tým, že v kroku b) pripravená zmes sa v kroku c) plní do formy a lisuje sa.Process according to any one of claims 1 to 4, characterized in that in step b) the mixture prepared in step c) is filled into a mold and pressed. II 7. Spôsob podľa nároku 6, vyznačujúci sa tým, že zmes sa po, lisovaní vypaľuje a vyberá sa z formy.Method according to claim 6, characterized in that the mixture is fired after pressing and is removed from the mold. 8. Spôsob podľa nároku 6, vyznačujúci sa tým, že takto vyrobený polotovar sa po lisovaní vyberá z formy a následne sa vypaľuje.Method according to claim 6, characterized in that the blank thus produced is removed from the mold after the pressing and subsequently fired. 9. . Spôsob podľa nároku 7 alebo 8, vyznačujúci sa tým, že zmes alebo polotovar sa vypaľujú pri teplote v rozsahu 800 až 1 000 °C.9.. Method according to claim 7 or 8, characterized in that the mixture or semi-finished product is fired at a temperature in the range 800 to 1000 ° C. 10. Akumulačný blok pre elektrické akumulačné vykurovacie zariadenie, predovšetkým vyrobený spôsobom podľa niektorého z nárokov 1 až 9, vyznačujúci sa tým, že z viac ako 50 % pozostává zo železných okovín.Storage tank for an electric storage heating device, in particular produced by a method according to any one of claims 1 to 9, characterized in that it consists of more than 50% of iron scales. 11. Akumulačný blok podľa nároku 10, vyznačujúci sa tým, že železné okoviny sú zbavené oleja.The accumulation block according to claim 10, characterized in that the iron scales are free of oil. 12. Akumulačný blok podľa nároku 10 alebo 11, vyznačujúci sa tým, že obsahuje spojivo, výhodne keramické spojivo.Accumulation block according to claim 10 or 11, characterized in that it comprises a binder, preferably a ceramic binder. 13. Akumulačný blok podľa nároku 12, vyznačujúci sa tým, že obsahuje 85 až 99 % hmotn. železných okovín a 1 až 15 % hmotn. spojiva.13. An accumulation block according to claim 12, characterized in that it contains 85 to 99 wt. % of iron scales and 1 to 15 wt. binder. 14. Akumulačný blok podľa niektorého z nárokov 10 až 13, vyznačujúci sa tým, že obsahuje častice železných okovín s priemermi v rozsahu 0,01 mm až 4 mm, pričom 40 až 50 % železných okovín sú častice s priemermi v rozsahu 0,5 mm až 4 mm.An accumulation block according to any one of claims 10 to 13, characterized in that it contains iron sheath particles with diameters in the range of 0.01 mm to 4 mm, wherein 40 to 50% of the iron sheaths are particles with diameters in the range of 0.5 mm up to 4 mm.
SK152-2002A 2001-02-23 2002-01-29 Method of making a storage block for an electrical night-storage heating device and a storage block made by this method SK1522002A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10108738A DE10108738A1 (en) 2001-02-23 2001-02-23 Method of manufacturing a storage stone for an electric storage heater

Publications (1)

Publication Number Publication Date
SK1522002A3 true SK1522002A3 (en) 2003-03-04

Family

ID=7675240

Family Applications (1)

Application Number Title Priority Date Filing Date
SK152-2002A SK1522002A3 (en) 2001-02-23 2002-01-29 Method of making a storage block for an electrical night-storage heating device and a storage block made by this method

Country Status (6)

Country Link
EP (1) EP1234892B1 (en)
CZ (1) CZ2002286A3 (en)
DE (2) DE10108738A1 (en)
PL (1) PL194942B1 (en)
SK (1) SK1522002A3 (en)
YU (1) YU12302A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100395358C (en) * 2006-11-20 2008-06-18 黄丹喜 Process for recovering and reusing industrial acid-washed metal sludge

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1948447A1 (en) * 1969-09-25 1971-04-01 Svenska Silika Gmbh Cold-bonded refractory stove for heat - storage
DE2851083C2 (en) * 1978-11-25 1981-01-29 Didier-Werke Ag, 6200 Wiesbaden Process for the production of a ceramic heat storage stone
DE3149013A1 (en) * 1981-12-10 1983-06-16 Wilhelm 2400 Lübeck Städing A process for producing mouldings from fine-grained raw materials for use in a shaft furnace
GB2137978B (en) * 1983-04-11 1987-01-07 Norton Co Heat storage blocks and manufacture thereof
DD254381A1 (en) * 1986-12-06 1988-02-24 Florin Stahl Walzwerk METHOD FOR USING HEXAGINE-EFFICIENT MATERIALS
GB2237628A (en) * 1989-11-01 1991-05-08 Norton Co Thermal storage blocks
ES2099033B1 (en) * 1995-09-19 1998-02-16 Univ Santiago Compostela PROCEDURE FOR OBTAINING CERAMIC BLOCKS OF HEAT ACCUMULATORS FROM RED MUDS OF THE BAYER PROCESS.

Also Published As

Publication number Publication date
EP1234892A2 (en) 2002-08-28
DE10108738A1 (en) 2002-09-12
PL194942B1 (en) 2007-07-31
CZ2002286A3 (en) 2002-10-16
DE50207044D1 (en) 2006-07-20
EP1234892B1 (en) 2006-06-07
EP1234892A3 (en) 2003-06-04
YU12302A (en) 2004-11-25

Similar Documents

Publication Publication Date Title
US7390567B2 (en) Soft magnetic composite powder comprising an inorganic insulating coating, production method of the same, and production method of soft magnetic compact
EP2908968B1 (en) Mould material mixtures on the basis of inorganic binders, and method for producing moulds and cores for metal casting
CN102007549A (en) Composite magnetic material and method of manufacturing the same
AU729604B2 (en) Molding sand suitable for manufacturing cores and chill- molds
EP0044592A1 (en) Synthetic resin-bonded electromagnetic component and method of manufacturing same
DE102012020510A1 (en) Forming substance mixtures based on inorganic binders and process for producing molds and cores for metal casting
CN102380576A (en) Mixed casting molding sand and preparation method thereof
CN102728780B (en) Water glass molding sand and producing method thereof
CN102380575A (en) Resin casting molding sand and preparation method thereof
CN102728775A (en) Molding sand containing wood fiber and production method thereof
CN102085561A (en) Composite curing agent for phosphate casting binder and preparation method of composite curing agent
KR20120068914A (en) Soft magnetic powder, powder granules, dust core, electromagnetic component, and method for producing dust core
CN101574725A (en) Molding sand for aluminum casting and preparation technology thereof
JP2007200962A (en) Composite material, method for manufacturing the same, magnetic core, and coil component
CN104837581B (en) Iron powder for dust core
CN102728781A (en) Molding sand using cement as binder and producing method thereof
EP1697273A2 (en) Production of aerogels containing fillers
SK1522002A3 (en) Method of making a storage block for an electrical night-storage heating device and a storage block made by this method
CN102389940A (en) Novel molding sand preparation method thereof
JP2003109812A (en) Dust core and its manufacturing method
CN102554118B (en) Molding sand for casting aluminum and preparation method of molding sand
JP2005311196A (en) Dust core for vehicle-mounted motor, and manufacturing method thereof
JPS6039135A (en) Manufacture of dust core of magnetic iron-silicon- aluminum alloy
CN105142823B (en) Iron powder for dust core
KR100499013B1 (en) Fe-Si alloy powder cores and fabrication process thereof