EP0125384B1 - Verfahren zur Regenerierung von Giessereialtsand und Vorrichtung zur Durchführung des Verfahrens - Google Patents

Verfahren zur Regenerierung von Giessereialtsand und Vorrichtung zur Durchführung des Verfahrens Download PDF

Info

Publication number
EP0125384B1
EP0125384B1 EP84101090A EP84101090A EP0125384B1 EP 0125384 B1 EP0125384 B1 EP 0125384B1 EP 84101090 A EP84101090 A EP 84101090A EP 84101090 A EP84101090 A EP 84101090A EP 0125384 B1 EP0125384 B1 EP 0125384B1
Authority
EP
European Patent Office
Prior art keywords
sand
container
thermal
working
burner
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
EP84101090A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0125384A1 (de
Inventor
Dieter S. Leidel
Hubert Eirich
Paul Eirich
Walter Eirich
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0125384A1 publication Critical patent/EP0125384A1/de
Application granted granted Critical
Publication of EP0125384B1 publication Critical patent/EP0125384B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S241/00—Solid material comminution or disintegration
    • Y10S241/10—Foundry sand treatment

Definitions

  • the invention relates to a method for regenerating foundry sand by thermal and mechanical processing according to the preamble of claim 1 and also relates to a device for carrying out such a method according to the preamble of claim 7.
  • molding sand systems in the foundry, namely those in which inorganic binders, e.g. B. clay, the other, in which organic binder, for. As synthetic resin, and including those in which binders containing a volatile solvent are used.
  • the latter sand system mainly serves the mask molding process; that with synthetic resin as a binder mainly serves for core molding; and for the areas outside the core, prefabricated sand with clay is mainly used as a binding agent.
  • a molding sand system with clay is the cycle in which the finished sand is put into the mold, does its actual molding work during casting, is emitted as waste sand after emptying and is at least partially mixed with new sand, bentonite, water and coal dust, so that at correct dosage and mixing the finished sand is created again.
  • the aim of the experts and also of the present invention is to process the waste sand as well as possible in order to obtain a new sand with such good quality that the core can also be formed therewith, and there is obviously great economic interest in the treatment of the waste sand because of this Transport and storage incur additional costs.
  • DE-OS-31 03 030 describes such a method in which used sand is metered into a fluidized bed furnace and is thermally treated and heated by hot gases in such a way that the fine grain can already be separated. All of the old sand is dried in this fluidized bed oven, and the clay or bentonite is stripped of its binding capacity and plasticity. The embrittled bentonite crusts lying around the quartz grains are fed to an impact mill with a downstream sifter after cooling the thermally treated sand mixture in accordance with the known method. The solid binder residues or crusts are removed in this impact mill and the quartz grains are, so to speak, rubbed bright, whereby the rubbed-off fine material is separated from the heavier quartz grains in the classifier.
  • the disadvantage is the high energy consumption of the known system, which essentially results from tests in that the entire amount of sand in the fluidized bed furnace has to be heated to about 870 ° C. In other words, each quartz grain is heated up to the core. This is understandable because the thermal conductivity of the quartz is higher than that of the bentonite shell. In order to ensure that all binder constituents or bentonite casings around the quartz grains have the required temperature even during the mechanical processing, it is necessary in the separate, previous heating stage with its entire mass (through and through) to the required final temperature bring. But this means the supply of a disadvantageously large amount of heat.
  • a process is known from DE-A-23 07 773, which forms the preamble of claims 1 and 7 and a device is known in which castings and molding sand are placed together in a rotating drum.
  • the mechanical energy acting on the sand which is supposed to cause the abrasion of the binder layers on the grain of sand, comes exclusively from the rolling movements of the castings.
  • foundry sand binders e.g. B. synthetic resins for the mask molding process, which have an ignition temperature of 800 ° C.
  • To remove the binder layer it is necessary to heat the sand to this temperature. Depending on whether this temperature is generated by the hot castings themselves or whether this temperature is generated by a burner, this automatically leads to the castings also adopting a correspondingly high temperature or not falling below them.
  • the strength of the castings is extremely low in this state.
  • the forms often consist of a combination of molding masks with synthetic resin binding and filling material with clay binding.
  • the clay contained in the sand burns or chamottes at temperatures above 600 ° C. In order to rub this fired clay from the grain of the sand surface, extremely high impact and rubbing effects are necessary. To do this, the sand must be processed with high-speed tools.
  • the present invention has for its object to provide a method and an apparatus for generating foundry sand, in which not only a sand of very good quality is obtained, but also less energy is consumed than in known methods.
  • This object is achieved in that essentially only the binder casings are heated and, during this heating, the material to be treated is comminuted with abrasion of the binder casings by a high-speed comminution tool, the very fine fraction being separated off during this processing.
  • thermal treatment is not carried out separately and mechanical treatment is carried out separately, which was previously considered indispensable in most cases, but instead, while the material to be treated is being heated, it is distributed and rubbed off at the same time.
  • the comminution takes place during the heating, so that the heating of a strongly moving mass is carried out, with all the advantages which result from this.
  • the energy saving with the method according to the invention can be explained by the fact that not the entire grain of sand, including the binder casing, but only the casing is heated, so that obviously a smaller amount of heat is sufficient for the required minimum treatment of the used sand.
  • the mechanical processing or reprocessing of the used sand is preferably carried out in the event of a stormy movement while achieving friction and impact effects.
  • freshly embrittled shell parts or binder parts are chipped off by the heating and are ready for removal. Even before the heat can penetrate the grain of sand, as it were during the supply of heat, the abrasion effect occurs through the simultaneous shredding.
  • the sand end product only has a temperature of 100 ° to 400 ° C., preferably 250 ° to 300 ° C. Obviously, it is on average a much smaller amount of heat that must be supplied for thermal treatment in the sense of the invention compared to that of the known method.
  • the very fine fractions are separated off during the thermal and mechanical processing. Since with this simultaneous separation, for. B. by suction, the fines continuously prepare only the remaining parts and are to be thermally treated, the mass to be heated is becoming less and less while increasing the efficiency.
  • the sludge the grain diameter of which is generally less than 20 j.1.m, is considered to be a very fine fraction.
  • the temperature and / or the degree of purity of the sand mixture being processed is or are measured during the thermal and mechanical treatment, and the measurement result is used as a control signal for setting the intensity of the thermal and / or mechanical action on the sand mixture used.
  • the moisture and temperature measurement can be carried out contactlessly or by means of sensors and the measurement signal can be used to draw conclusions for the generation of control signals which are used, for example, to increase the performance of the burner or increase the speed of the comminution tool, but on the other hand a change in the dwell time can also be expedient .
  • the degree of purity of the sand mixture being processed is measured by removing a portion of the sand mixture being processed and testing it separately during the processing operation.
  • the clay content can be determined with great accuracy in a very short time. If these measurement or test results are converted into control signals, the performance of the heat supply devices or the mechanical preparation tools can be changed as well as the dwell time or processing time of the material to be treated. Such sampling can be carried out at short intervals so that optimal preparation is achieved.
  • the efficiency of the regeneration method according to the invention can be when processing Old sand containing lumps can be further improved by pre-grinding prior to thermal and mechanical processing for crushing large lumps in the sand mixture at a lower temperature than the temperature reached during thermal processing. Then you get better access to the heat supply to the individual bentonite shells of the grains of sand, to which a thermal shock is supplied by the process according to the invention, so that the sheath jumps off and is immediately sucked off as a fine fraction, preferably during processing.
  • the sand mixture is mixed with a volatile solvent or a low-melting binder in the final stage of the thermal treatment.
  • This type of coating of the grains of sand is already known, for example for the mask molding process.
  • the solvent must be heated by subsequently introduced hot air or by hot gases and brought to evaporation.
  • the heat still available from the regeneration can be used immediately to evaporate the solvent in an accelerated manner.
  • binders in powder form with a low melting point preferably below 400 ° C.
  • the device for carrying out the method according to the invention has a comminution tool rotating in a container at high speed and devices for supplying heat, preferably a burner or a gas line, and for separating the fine particles, preferably blowers, and is characterized in that at least one Burner or a gas line is provided on the same container in which the comminution tool is also arranged.
  • the economical regeneration method according to the invention described above can be carried out in this way with a very simple device. As a result, capital expenditure and maintenance are advantageously ensured even when the process is carried out with high efficiency.
  • the use of the high-speed or high-speed comminution tool enables great turbulence to be created in the material to be treated, which is not only advantageous for suction after the embrittled binder casings have been knocked off.
  • the burner gas flame or the hot gases generated by an oil burner can act on a turbulently moving material to be processed, so that it is ensured with great certainty that the heat used acts primarily on the binder casing and ensures embrittlement, so that the heat of the sand grain which has been thermally prepared shortly thereafter opens up the comminution tool allows the desired mechanical processing, after which the very fine fraction is separated and is expediently removed immediately.
  • the regeneration process can be carried out continuously or in batches.
  • the processing or dwell time is only very short and is usually only a few seconds.
  • the dwell time can be set much higher; it is a few minutes even in continuous operation if this is desired. Batch operation can be particularly cheap because machines with high turbulence generation can then be used, high mechanical energy can be introduced with intensity and the residence time can nevertheless be set more precisely.
  • the quality (degree of purity) of the end product in the manner described above allows the possibility of control and precise adjustability of the residence time.
  • the burner and / or the comminution tool are attached such that they can be folded out of the container.
  • simple, easy-to-use and maintainable machines can be used.
  • the axis of the tube introducing the fuel or hot gas into the container is parallel to the axis of rotation of the comminution tool and the gas introduction tube is fastened to the closure lid of the container at a distance from the comminution tool.
  • the axial direction of the burner flame is parallel to The axis of rotation of the shredding tool lies. It is favorable to use cylindrical containers in which the processing takes place, the container axis then also lying parallel to the axis of rotation of the comminution tool and to the burner flame.
  • the gas introduction tube is fastened in the lower edge region of the container in the case of a container rotatably driven about an axis set at an angle to the perpendicular.
  • a container rotatably driven about an axis set at an angle to the perpendicular are already known in processing and mixing machines. Its axis of rotation is set at an angle to the plumb line, for example 10 ° to 60 °, preferably 20 to 50 ° -30 °, is an advantage that has been tried and tested in many machines, resulting in a lower area and an upper area when the container is viewed from above .
  • wall wipers are used, they are usually arranged in the upper region, while according to the invention the burner or a hot gas pipe is fastened in the lower edge region of the container.
  • the burner gas outflow pipe or the oil burner hot gas pipe ends at a distance from the bottom of the container, and the container has charging and emptying openings, preferably in the lid and bottom.
  • the burner or the gas line is arranged in front of the comminution tool as seen in the direction of rotation of the container. This ensures that the sand grain is rubbed off before the heat can penetrate into the interior of the sand grain, because after heating, the sand grain reaches the engagement area of the comminution tool in the shortest possible time. This also improves efficiency further.
  • the comminution tool can be driven at an adjustable speed, so that it can be adapted to the respective task (e.g. recovery of different old sands or recovery for different reuse).
  • the suction can take place through at least one tube which projects into the container of the comminution machine.
  • the tube can be designed to be pivotable and the immersion depth can be adjusted in order to carry out the suction at the most favorable point with the desired turbulence.
  • the device for regenerating or reprocessing foundry sand has a machine frame 6 fastened to a base frame 15, which carries a rotatable container 3, the axis of rotation 16 of which is set against the solder 17 at an angle of 25 °.
  • This container is cylindrical with a cylinder-wall-shaped side wall, which is closed at the bottom by a fixed base 18 and at the top by a cover 19 fixed to the machine frame 6.
  • the container 3 is driven by a motor 13, which can only be partially seen in FIGS. 1, 3 and 4.
  • the angular inclination of the container axis of rotation 16 results in an upper region inside the container 3, which is located on the right in the figures, and an opposite lower region.
  • a wall scraper with deflector 14 is fastened to the cover 19, the guide plate of which can be arranged in an L-shape (and extending over the container bottom 18 in an arc) along the walls.
  • Eccentric to the axis of rotation 16 of the container 3 is the axis of rotation 20 of the comminution tool 4, which is as parallel to the axis 16 as the axis 21 of the burner flame 2 or axis 21 'of the hot gases 2'.
  • These axes 21 and 21 ' are also those of the gas introduction pipes 22 and 22' of the burner 1 on the one hand and the hot gas line 12 on the other hand.
  • the bottom 18 of the container 3 can be closed by a closure lid 5 or can be opened by pivoting the bottom closure lid 5 about the axis of rotation 23 in the direction of the dash-dotted, curved line 24.
  • the comminution tool 4 is driven by the electric motor 7.
  • the bottom closure cover 5 is driven by a hydraulic unit 8.
  • the axis 21 of the burner hot gas introduction tube 22 is arranged in the lower edge region of the container 3 at a distance from the comminution tool 4.
  • a hot gas line 12 with the hot gas introduction pipe 22 ′ is provided instead of the burner, the hot gases being generated by the combustion chamber 11 will. This in turn is connected to the oil burner 10. This achieves a full. more constant combustion of the oil.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Processing Of Solid Wastes (AREA)
EP84101090A 1983-03-16 1984-02-03 Verfahren zur Regenerierung von Giessereialtsand und Vorrichtung zur Durchführung des Verfahrens Expired EP0125384B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3309379 1983-03-16
DE3309379A DE3309379A1 (de) 1983-03-16 1983-03-16 Verfahren zur regenerierung von giessereialtsand und vorrichtung zur durchfuehrung des verfahrens

Publications (2)

Publication Number Publication Date
EP0125384A1 EP0125384A1 (de) 1984-11-21
EP0125384B1 true EP0125384B1 (de) 1988-08-17

Family

ID=6193621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84101090A Expired EP0125384B1 (de) 1983-03-16 1984-02-03 Verfahren zur Regenerierung von Giessereialtsand und Vorrichtung zur Durchführung des Verfahrens

Country Status (10)

Country Link
US (1) US4681267A (ja)
EP (1) EP0125384B1 (ja)
JP (1) JPS59169644A (ja)
AU (1) AU563107B2 (ja)
BR (1) BR8401188A (ja)
CA (1) CA1210561A (ja)
DE (2) DE3309379A1 (ja)
ES (1) ES530003A0 (ja)
IN (1) IN161746B (ja)
MX (1) MX161637A (ja)

Families Citing this family (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5354038A (en) * 1989-09-29 1994-10-11 Consolidated Engineering Company, Inc. Heat treatment of metal castings and in-furnace sand reclamation
CH680498A5 (ja) * 1989-11-28 1992-09-15 Fischer Ag Georg
IT1237296B (it) * 1989-11-28 1993-05-27 Metodo per il recupero delle sabbie di fonderia esauste mediante arrostimento.
CH681283A5 (ja) * 1990-08-16 1993-02-26 Fischer Ag Georg
CH681067A5 (ja) * 1990-09-05 1993-01-15 Fischer Ag Georg
CH687858A5 (de) * 1992-07-01 1997-03-14 Fischer Georg Giessereianlagen Einrichtung zur Regenerierung von Giesserei-Sand.
DE4237838A1 (de) * 1992-11-10 1994-05-11 Badische Maschf Gmbh Verfahren und Vorrichtung zum Regenerieren von Gießereialtsand
DE4306007A1 (de) * 1993-02-26 1994-09-01 Dietmar Domnick Fa Verfahren zur Regenerierung wasserglasgebundener Gießerei-Altsande
US5363779A (en) * 1993-12-01 1994-11-15 Praxair Technology, Inc. Systems and processes for pyrolyzing contaminants on foundry sand and combusting the resulting gas
FR2733302B1 (fr) * 1995-04-21 1997-05-23 Air Liquide Procede de traitement par combustion de solides a faible pouvoir calorifique
US6217317B1 (en) 1998-12-15 2001-04-17 Consolidated Engineering Company, Inc. Combination conduction/convection furnace
US6336809B1 (en) 1998-12-15 2002-01-08 Consolidated Engineering Company, Inc. Combination conduction/convection furnace
DE19919039C2 (de) * 1999-04-27 2003-09-04 Foerder & Anlagentechnik Gmbh Anordnung zur Aufbereitung von Formsand
US6672367B2 (en) 1999-07-29 2004-01-06 Consolidated Engineering Company, Inc. Methods and apparatus for heat treatment and sand removal for castings
US7275582B2 (en) * 1999-07-29 2007-10-02 Consolidated Engineering Company, Inc. Methods and apparatus for heat treatment and sand removal for castings
US6910522B2 (en) * 1999-07-29 2005-06-28 Consolidated Engineering Company, Inc. Methods and apparatus for heat treatment and sand removal for castings
DE19945569A1 (de) * 1999-09-23 2001-03-29 Eirich Maschf Gustav Verfahren zur Aufbereitung von Gießereiformsand und Vorrichtung hierfür
US6622775B2 (en) 2000-05-10 2003-09-23 Consolidated Engineering Company, Inc. Method and apparatus for assisting removal of sand moldings from castings
EP1222978A3 (en) * 2001-01-15 2007-10-17 Sintokogio, Ltd. A method for making sand covered with bentonite, the sand, and a method for recycling molding sand for a mold using the sand covered by bentonite
CN1526027A (zh) * 2001-02-02 2004-09-01 ̹�� 综合性金属加工设备
US7338629B2 (en) * 2001-02-02 2008-03-04 Consolidated Engineering Company, Inc. Integrated metal processing facility
US6514302B2 (en) * 2001-05-15 2003-02-04 Saint-Gobain Abrasives, Inc. Methods for producing granular molding materials for abrasive articles
KR20070052361A (ko) * 2002-07-11 2007-05-21 콘솔리데이티드 엔지니어링 캄파니, 인크. 주조품으로부터 샌드 주형의 제거를 보조하기 위한 방법
US6901990B2 (en) * 2002-07-18 2005-06-07 Consolidated Engineering Company, Inc. Method and system for processing castings
US20060054294A1 (en) * 2004-09-15 2006-03-16 Crafton Scott P Short cycle casting processing
US20060103059A1 (en) * 2004-10-29 2006-05-18 Crafton Scott P High pressure heat treatment system
WO2008121671A2 (en) * 2007-03-29 2008-10-09 Consolidated Engineering Company, Inc. Vertical heat treatment system
RU2582165C2 (ru) * 2012-08-24 2016-04-20 Общество с ограниченной ответственностью "ИСМ Технолоджис" Устройство для смешивания и измельчения
RU2589952C2 (ru) * 2014-07-14 2016-07-10 Алексей Гавриилович Афанасьев Устройство для смешивания и измельчения
RU2570048C1 (ru) * 2014-07-14 2015-12-10 Алексей Гавриилович Афанасьев Устройство для смешивания и измельчения
KR102076897B1 (ko) 2015-04-28 2020-02-12 콘솔리데이티드 엔지니어링 캄파니, 인크. 알루미늄 합금 주물을 열처리하는 시스템 및 방법
RU169721U1 (ru) * 2016-03-14 2017-03-29 Федеральное государственное бюджетное образовательное учреждение высшего образования "Рыбинский государственный авиационный технический университет имени П.А. Соловьева" Центробежно-лопаточный смеситель
CN106141080A (zh) * 2016-05-20 2016-11-23 许云东 一种滚筒式混砂机及其混砂方法
RU2624286C1 (ru) * 2016-06-01 2017-07-03 Алексей Гавриилович Афанасьев Устройство для смешивания и измельчения
CN109848366B (zh) * 2019-03-19 2023-10-27 芜湖诚拓汽车部件股份有限公司 铸造废砂回收系统及其控制方法
JP6948090B2 (ja) 2019-03-28 2021-10-13 太洋マシナリー株式会社 鋳物砂の再生システムと鋳物砂の再生方法
CN110076288A (zh) * 2019-04-30 2019-08-02 安徽全柴天和机械有限公司 一种旧砂机械再生的砂粒摩擦器
RU2711120C1 (ru) * 2019-05-06 2020-01-15 Игорь Феликсович Шлегель Устройство измельчения
RU193693U1 (ru) * 2019-07-12 2019-11-11 Федеральное государственное бюджетное образовательное учреждение высшего образования "Рыбинский государственный авиационный технический университет имени П.А. Соловьева" Центробежно-лопаточный смеситель
CN110918874A (zh) * 2019-12-30 2020-03-27 新兴铸管阜康能源有限公司 一种环保砂芯生产系统
JP7171944B2 (ja) * 2020-04-27 2022-11-15 ヤマハ発動機株式会社 鋳物砂再生方法
CN112719209A (zh) * 2020-12-24 2021-04-30 安徽永恒泰环保科技有限公司 树脂沙回收利用加工方法
CN113333434B (zh) * 2021-05-13 2022-12-13 洛阳易普特智能科技有限公司 一种生产磁性材料砂型的破碎收集机
CN114192740B (zh) * 2021-12-13 2023-09-08 马鞍山市绿科环保科技有限公司 一种保湿模砂造型工艺固体废弃物再生的方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456769A (en) * 1944-02-16 1948-12-21 Herbert S Simpson Method of reclaiming foundry sand
US2515194A (en) * 1946-05-02 1950-07-18 Herbert S Simpson Method of and apparatus for sand recovery
US3173794A (en) * 1961-12-26 1965-03-16 Reckon Edward Process and apparatus for treating grain
US3144244A (en) * 1963-02-01 1964-08-11 Pettibone Mulliken Corp Apparatus for heating foundry sand or similar granular material
CH402293A (de) * 1963-05-02 1965-11-15 Fischer Ag Georg Vorrichtung zum ununterbrochenen Aufbereiten von Giessereisand
CH490110A (de) * 1969-02-28 1970-05-15 Spemag Ag Mischmaschine
NL7201998A (ja) * 1972-02-16 1973-08-20
DE2514062C2 (de) * 1975-03-29 1982-04-01 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe Vorrichtung zur Überwachung des Regenerationszustandes von Formsand
DE3103030C2 (de) * 1981-01-30 1984-05-03 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren zur Gewinnung von Gießereisand aus gebrauchtem Gießereisand

Also Published As

Publication number Publication date
CA1210561A (en) 1986-09-02
AU563107B2 (en) 1987-06-25
IN161746B (ja) 1988-01-30
ES8500778A1 (es) 1984-11-01
US4681267A (en) 1987-07-21
BR8401188A (pt) 1984-10-23
ES530003A0 (es) 1984-11-01
JPH0338014B2 (ja) 1991-06-07
DE3309379A1 (de) 1984-09-20
MX161637A (es) 1990-11-27
DE3473417D1 (en) 1988-09-22
JPS59169644A (ja) 1984-09-25
AU2564084A (en) 1984-09-20
EP0125384A1 (de) 1984-11-21

Similar Documents

Publication Publication Date Title
EP0125384B1 (de) Verfahren zur Regenerierung von Giessereialtsand und Vorrichtung zur Durchführung des Verfahrens
DE2550879C3 (de) Vorrichtung zur bekannten Wiederverwertung des Abfalls von wärmegehärtetem Kunststoff
DE3103030C2 (de) Verfahren zur Gewinnung von Gießereisand aus gebrauchtem Gießereisand
DE2650919C2 (de) Verfahren und Vorrichtung zum Trocknen eines Produktes, wie Dünger oder Schlamm
DE4109167A1 (de) Verfahren zum aufbereiten von (giesserei-)altsand
EP0243819B1 (de) Verfahren zum Trennen in Fraktionen einer heterogenen Menge aus festem Material und Vorrichtung zur Durchführung des Verfahrens
DE2628916A1 (de) Verfahren und vorrichtung zur rueckgewinnung von feinstverteilten feststoffen aus schlaemmen
DE4132906C2 (de) Verwendung einer Maschine zur Gipskartonplattenwiederaufarbeitung
DE2802941A1 (de) Anordnung zum herstellen von brechsanden aus mittels wasser granulierter hochofenschlacke
EP0597335A1 (de) Verfahren und Vorrichtung zum Regenerieren von Giessereialtsand
DE2907727A1 (de) Vorrichtung zum zerbrechen und zerkleinern von gussformen in rueckgewinnbares teilchenmaterial
DE4032798C2 (de) Verfahren zur Regenerierbehandlung von überwiegend tongebundenem Gießerei-Altsand
DE2108181C3 (de) Vorrichtung zum Aufbereiten, Mischen, Auflockern, Zerteilen oder Kühlen von körnigem Material, insbesondere Gießsand
EP0705795B1 (de) Verfahren zur Aufbereitung von mit organischen und/oder schwermetallhaltigen Verbindungen kontaminierten Schlämmen
DE4010377A1 (de) Verfahren zur formsandrueckgewinnung aus altsand von giessereibetrieben und system zu seiner durchfuehrung
EP0767019B1 (de) Verfahren und Vorrichtung zur Regenerierung von Giesserei-Altsand
DE2751500C2 (de) Verfahren und Vorrichtung zum Kühlen, Trocknen und Trennen von Gußstücken und Formsand in einer Kühltrommel
DE2730941C2 (de) Vorrichtung zum Granulieren von pulverförmigem, faserigem, pastösem oder breiigem Gut und zum Trocknen der erhaltenen Granulate
DE2745179A1 (de) Verfahren und vorrichtung zum chargenweisen mischen, trocknen und/oder granulieren von schuettguetern
EP0447366A1 (de) Granulat sowie Verfahren und Vorrichtung zu seiner Herstellung
EP0917921B1 (de) Verfahren und Vorrichtung zur Rückgewinnung von Kern- oder Formsand
DE2422434C3 (de) Verfahren zur Herstellung einer Asbestzement-Suspension und Vorrichtung zur Durchführung des Verfahrens
DE3838500C2 (ja)
DE2656098C2 (ja)
AT209785B (de) Verfahren und Vorrichtung zum Herstellen und Abpacken von trockenem, vorgemischtem Beton od. dgl.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19841020

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed

Owner name: STUDIO INGG. FISCHETTI & WEBER

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE FR GB IT LI

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3473417

Country of ref document: DE

Date of ref document: 19880922

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19910117

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19920228

BERE Be: lapsed

Owner name: EIRICH WALTER

Effective date: 19920228

Owner name: EIRICH PAUL

Effective date: 19920228

Owner name: EIRICH HUBERT

Effective date: 19920228

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19940112

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19950116

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19950120

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19950228

Ref country code: CH

Effective date: 19950228

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19950322

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19960203

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19960203

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19961031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19961101

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST