EP0368035A1 - Appareillage d'épuration en discontinu de bains de sels - Google Patents

Appareillage d'épuration en discontinu de bains de sels Download PDF

Info

Publication number
EP0368035A1
EP0368035A1 EP89119225A EP89119225A EP0368035A1 EP 0368035 A1 EP0368035 A1 EP 0368035A1 EP 89119225 A EP89119225 A EP 89119225A EP 89119225 A EP89119225 A EP 89119225A EP 0368035 A1 EP0368035 A1 EP 0368035A1
Authority
EP
European Patent Office
Prior art keywords
desludging
filter unit
discontinuous
salt
conveyor tube
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.)
Granted
Application number
EP89119225A
Other languages
German (de)
English (en)
Other versions
EP0368035B1 (fr
Inventor
Georg Dipl.-Ing. Wahl
Klaus Dipl.-Ing. Breitwieser
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.)
Houghton Durferrit degussa-Huels AG GmbH
Original Assignee
Degussa GmbH
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 Degussa GmbH filed Critical Degussa GmbH
Priority to AT89119225T priority Critical patent/ATE89326T1/de
Publication of EP0368035A1 publication Critical patent/EP0368035A1/fr
Application granted granted Critical
Publication of EP0368035B1 publication Critical patent/EP0368035B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/44—Methods of heating in heat-treatment baths
    • C21D1/46—Salt baths
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions

Definitions

  • the invention relates to a device for the discontinuous desludging of salt baths used for metal treatment, consisting of a delivery pipe, an air supply line and a filter unit.
  • the quality of the treated components is significantly influenced by the sludge content and the cleanliness of the molten salt.
  • the sludge formation can be attributed to various causes, such as grinding dust brought in with the material to be treated, processing chips, rust and scale, as well as contamination from charging racks. Iron contamination in the bath also influences the formation of the connection layer of parts nitrocarburized in the salt bath.
  • a device for continuous desludging of salt baths which consists of a delivery pipe, an air supply and a filter unit that is completely or partially immersed in the salt bath.
  • This device has the disadvantage that part of the bath is lost for use. On the other hand, it is not suitable for discontinuous operation, since the time required for a salt bath throughput is relatively large.
  • a bottom plate is left open the conveyor tube opening, which is provided in the direction of the salt bath crucible bottom with spacers that an intake port is arranged in the conveyor tube, which can move telescopically down and up in the conveyor tube , and that the filter unit is attached to the conveyor tube at a height that ensures complete or partial immersion of the filter unit in the salt bath.
  • the device according to the invention has the advantage that the narrow gap width from the base plate to the crucible base ensures a high suction speed of the molten salt and good turbulence underneath the base plate, whereby the soil sludge is also captured. Furthermore, it is ensured that the salt melt to be filtered is conveyed from the lowest point of the crucible through the conveyor tube into the filter unit by the movable suction nozzle.
  • the high delivery capacity of the device enables multiple volume changes of the molten salt during the desludging period of about 20 to 30 minutes. Wire fabrics with mesh sizes of 0.05 to 0.5 mm or glass wool are preferably used as filter materials.
  • the figure schematically shows an exemplary embodiment of the device according to the invention in longitudinal section.
  • the device consists of a conveyor pipe (2), in which there is an air supply line (1) and at the lower end a telescopically displaceable suction nozzle (5). Furthermore, a bottom plate (7) is attached to the lower end of the conveyor tube (2), which leaves the suction opening of the conveyor tube (2) free and is provided with spacers (4) against the crucible bottom.
  • the filter unit (3) is attached in the upper area of the delivery pipe (2). In this area, the delivery pipe (2) is provided with slots (6).
  • the device o C good pre-heated at about 350 in a preheating furnace and absolutely dry slowly in the salt bath retracted.
  • the desludging device should stand centrally on the crucible bottom. Then the air supply is connected to the air supply line (1) and turned up until the liquid salt runs continuously through the slots (6) of the delivery pipe (2) into the filter unit (3). Depending on the degree of contamination of the bath, the filter clogs up during the desludging process. This leads to an increase in the salt level in the filter unit. In general, the desludging process ends after 30 minutes if no further rise in the bath level is observed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Treatment Of Sludge (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Seasonings (AREA)
EP89119225A 1988-10-29 1989-10-17 Appareillage d'épuration en discontinu de bains de sels Expired - Lifetime EP0368035B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89119225T ATE89326T1 (de) 1988-10-29 1989-10-17 Vorrichtung zur diskontinuierlichen entschlammung von salzbaedern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3836939 1988-10-29
DE3836939A DE3836939C1 (fr) 1988-10-29 1988-10-29

Publications (2)

Publication Number Publication Date
EP0368035A1 true EP0368035A1 (fr) 1990-05-16
EP0368035B1 EP0368035B1 (fr) 1993-05-12

Family

ID=6366189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89119225A Expired - Lifetime EP0368035B1 (fr) 1988-10-29 1989-10-17 Appareillage d'épuration en discontinu de bains de sels

Country Status (5)

Country Link
EP (1) EP0368035B1 (fr)
JP (1) JP2904825B2 (fr)
AT (1) ATE89326T1 (fr)
DE (2) DE3836939C1 (fr)
ES (1) ES2040436T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4400755A1 (de) * 1993-01-26 1994-07-28 Leybold Durferrit Gmbh Filtereinheit und Vorrichtung zum Entschlammen von Salzbädern
ES2138638T3 (es) * 1994-01-13 2000-01-16 Houghton Durferrit Gmbh Unidad de filtro y dispositivo para desenlodar baños salinos.
KR101144400B1 (ko) * 2011-06-21 2012-05-10 현대위아 주식회사 열처리 염욕용 솔트 운반 장치
CN104671060A (zh) * 2015-02-11 2015-06-03 河南东风新研材科技有限公司 一种砂轮托架
CN106744238A (zh) * 2015-11-25 2017-05-31 桃江县扬洋机电科技有限公司 一种细长零件盐浴表面处理吊具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH374378A (de) * 1958-06-03 1964-01-15 Degussa Verfahren und Vorrichtung zum Entschlammen von Warmbädern in der Härtetechnik
GB2046611A (en) * 1979-03-22 1980-11-19 Degussa Process and apparatus for desludging salt baths
DE2923028A1 (de) * 1979-06-07 1980-12-18 Volkswagenwerk Ag Verfahren und vorrichtung zum entschlammen von salzschmelzen, insbesondere von nitrierbaedern
DE3733721C1 (de) * 1987-10-06 1988-04-21 Degussa Vorrichtung zur kontinuierlichen Entschlammung von Salzbaedern

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2731167C3 (de) * 1977-07-09 1980-12-04 Degussa Ag, 6000 Frankfurt Verwendung von anorganischen Faserwerkstoffen zur Reinigung von Salzbädern und Vorrichtung zur Verwendung dieser Faserwerkstoffe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH374378A (de) * 1958-06-03 1964-01-15 Degussa Verfahren und Vorrichtung zum Entschlammen von Warmbädern in der Härtetechnik
GB2046611A (en) * 1979-03-22 1980-11-19 Degussa Process and apparatus for desludging salt baths
DE2923028A1 (de) * 1979-06-07 1980-12-18 Volkswagenwerk Ag Verfahren und vorrichtung zum entschlammen von salzschmelzen, insbesondere von nitrierbaedern
DE3733721C1 (de) * 1987-10-06 1988-04-21 Degussa Vorrichtung zur kontinuierlichen Entschlammung von Salzbaedern

Also Published As

Publication number Publication date
ES2040436T3 (es) 1993-10-16
JPH02170912A (ja) 1990-07-02
DE58904341D1 (de) 1993-06-17
ATE89326T1 (de) 1993-05-15
EP0368035B1 (fr) 1993-05-12
DE3836939C1 (fr) 1989-06-15
JP2904825B2 (ja) 1999-06-14

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