EP0116272B1 - Procédé de fabrication d'un matériau de grenaillage exempt de fer et de silice et destiné au traitement de surface - Google Patents

Procédé de fabrication d'un matériau de grenaillage exempt de fer et de silice et destiné au traitement de surface Download PDF

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Publication number
EP0116272B1
EP0116272B1 EP84100095A EP84100095A EP0116272B1 EP 0116272 B1 EP0116272 B1 EP 0116272B1 EP 84100095 A EP84100095 A EP 84100095A EP 84100095 A EP84100095 A EP 84100095A EP 0116272 B1 EP0116272 B1 EP 0116272B1
Authority
EP
European Patent Office
Prior art keywords
iron
raw material
magnetic separation
weight
maximum
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
EP84100095A
Other languages
German (de)
English (en)
Other versions
EP0116272A2 (fr
EP0116272A3 (en
Inventor
Willy Dr.-Ing. Ulrich
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.)
ASIKOS STRAHLMITTEL GMBH TE DINSLAKEN, BONDSREPUBL
Original Assignee
Krupp-Steag Strahlmittel 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 Krupp-Steag Strahlmittel GmbH filed Critical Krupp-Steag Strahlmittel GmbH
Priority to AT84100095T priority Critical patent/ATE42055T1/de
Publication of EP0116272A2 publication Critical patent/EP0116272A2/fr
Publication of EP0116272A3 publication Critical patent/EP0116272A3/de
Application granted granted Critical
Publication of EP0116272B1 publication Critical patent/EP0116272B1/fr
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
    • B24B31/14—Abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • abrasives are used for the surface treatment, especially of austenitic steels, which are almost iron-free, such as aluminum oxide, zircon sand and glass beads.
  • the iron oxide content is limited to a maximum of 0.1% by weight.
  • the object of the invention is to enable the production of a further silicon-free and iron-free abrasive which is also particularly suitable for the surface treatment of austenitic steels and is not very expensive.
  • the melting chamber slag granulate obtained in hard coal furnaces is to be used as the starting material.
  • the melting chamber slag granules are comminuted to the desired grain size before the resulting raw material with a total iron content of at most about 7% by weight, in the present mainly in the form of iron silicate and iron aluminate, is essentially freed from the iron present in metallic form by magnetic separation becomes.
  • Magnetic separation in which a thin raw material layer is preferably passed over magnetic drums, can be carried out in one or more stages depending on the layer thickness and the grain size distribution present; in many cases, a single-stage magnetic separation is sufficient to achieve or fall below the required metallic iron content of at most 0.1% by weight.
  • the surprising result achieved with the proposed method is that the above-mentioned maximum proportion of metallic iron can be maintained with the specified, less complex measures, although the total iron content of the raw material present after comminution is several times the factor 10 greater than the maximum proportion to be observed.
  • the surface effect achieved by means of the blasting agent can be adjusted by changing the grain size distribution of the blasting agent; a lower roughness depth can be achieved in particular by reducing the maximum permissible grain size.
  • the process can in particular be carried out in such a way that the desired grain fractions are sieved off only after magnetic separation; However, it is also possible to screen the raw material before carrying out the magnetic separation and to separate the resulting grain fractions from one another using suitable magnetic separators. Grain screening can take place, in particular, in the fractions that comply with the regulation according to DIN 8201 for aluminum oxide.
  • the method can in particular also be carried out in such a way that the melt chamber slag granules are comminuted into a raw material with a grain size of at most 0.25 mm before magnetic separation (claim 2); the melting chamber slag granulate is preferably comminuted as a raw material to a grain size which is predominantly in the range between 0.06 and 0.25 mm (claim 3).
  • An expedient development of the method according to the invention consists in that the layer of raw material subjected to magnetic separation has a thickness of at most five times, preferably two to three times, the maximum grain size (claim 5).
  • the layer in question should be set as thin as possible in order to be able to carry out the deposition of metallic iron as effectively as possible and, if possible, already in a single deposition stage.
  • the layer thickness can be adjusted in particular by suitable coordination between the amount of comminuted raw material fed in and the speed of the magnetic separator (s).
  • the abrasive produced from hard coal furnaces according to the teaching of the invention using melting chamber slag granules has the following typical chemical composition; the individual components are each given in% by weight:
  • the particle size distribution of the abrasive is as follows:
  • the abrasive therefore consists of approximately 70% grains in the range between 0.5 mm and 0.1 mm.
  • an abrasive of the listed composition has a significantly larger total iron content than, for example, zircon sand used for comparison (total iron content only about 0.2% by weight), its use for blasting stainless steels on these does not lead to extraneous rust formation if the melt chamber slag granulate serving as the starting material , which has been converted into a sufficiently comminuted raw material, the metallic iron is essentially removed beforehand by magnetic separation.
  • the manufacturing method according to the invention described at the outset can in particular be further developed in that the raw material is additionally subjected to a drying process at a suitable point in time, in particular also simultaneously with or after the magnetic deposition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Processing Of Solid Wastes (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Glass Compositions (AREA)

Claims (5)

1. Procédé de fabrication d'un matériau de grenaillage exempt de silice et de fer destiné au traitement de surface, notamment d'aciers austénétiques, d'une grosseur de grain maximale de 0,5 mm constitué d'un granulat de laitier de fonderie fragmenté, provenant de la chauffe au charbon, d'une teneur totale en fer d'environ 7% en poids au maximum, se présentant principalement sous la forme de silicate de fer et d'aluminate de fer, caractérisé en ce qu'il est procédé à la fragmentation du granulat de scories de four de fonderie pour l'amener à la grosseur de grain souhaitée, avant que la matière première ne soit amenée par séparation magnétique, à une teneur en fer métallique de 0,1% en poids au maximum. 2. Procédé selon la revendication 1, caractérisé en ce que le granulat de scories de four de fonderie est fragmenté avant la séparation magnétique, en une matière première d'une grosseur de grain maximale de 0,25 mm.
3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que le granulat de scories de four de fonderie est fragmenté avant la séparation magnétique de la matière première, pour obtenir une grosseur de grain qui se situe principalement entre 0,06 et 0,25 mm.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la teneur totale de la matière première avant la séparation magnétique, n'est pas supérieure à environ 6, de préférence 5,5% en poids.
5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la couche de matière première soumise à la séparation magnétique a dans tous les cas une épaisseur qui est de l'ordre de cinq fois, de préférence de deux à trois fois, la grosseur de grain maximale.
EP84100095A 1983-01-15 1984-01-07 Procédé de fabrication d'un matériau de grenaillage exempt de fer et de silice et destiné au traitement de surface Expired EP0116272B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84100095T ATE42055T1 (de) 1983-01-15 1984-01-07 Verfahren zur herstellung eines silikose- und eisenfreien strahlmittels fuer die oberflaechenbehandlung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3301172A DE3301172C1 (de) 1983-01-15 1983-01-15 Verfahren zur Herstellung eines silikose- und eisenfreien Strahlmittels zur Oberflaechenbehandlung
DE3301172 1983-01-15

Publications (3)

Publication Number Publication Date
EP0116272A2 EP0116272A2 (fr) 1984-08-22
EP0116272A3 EP0116272A3 (en) 1986-08-20
EP0116272B1 true EP0116272B1 (fr) 1989-04-12

Family

ID=6188344

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100095A Expired EP0116272B1 (fr) 1983-01-15 1984-01-07 Procédé de fabrication d'un matériau de grenaillage exempt de fer et de silice et destiné au traitement de surface

Country Status (3)

Country Link
EP (1) EP0116272B1 (fr)
AT (1) ATE42055T1 (fr)
DE (1) DE3301172C1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4343371C1 (de) * 1993-12-18 1994-09-29 Mineralienwerke Kuppenheim Gmb Verfahren zur Trockenreinigung von Fassaden
JP4049848B2 (ja) * 1997-07-29 2008-02-20 Ｊｆｅマテリアル株式会社 研削材
IT201800005627A1 (it) * 2018-05-23 2019-11-23 Procedimento per ottenere materiali abrasivi da aggregati inerti derivanti da scorie metallurgiche
US20220332994A1 (en) * 2021-04-14 2022-10-20 Harsco Technologies LLC Demetallized slag for abrasives and/or roofing granules and related methods

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9082C (fr) * 1900-01-01
NL297592A (fr) * 1900-01-01
GB1136396A (en) * 1965-07-23 1968-12-11 Fisons Ltd Treating steel making slag
JPS54146096A (en) * 1978-05-08 1979-11-14 Sumitomo Metal Ind Ltd Sand material for sand blast use

Also Published As

Publication number Publication date
EP0116272A2 (fr) 1984-08-22
ATE42055T1 (de) 1989-04-15
DE3301172C1 (de) 1984-08-16
EP0116272A3 (en) 1986-08-20

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