EP0245744A2 - Procédé et dispositif pour séparer des poudres fines solides suivant leur granulométrie - Google Patents

Procédé et dispositif pour séparer des poudres fines solides suivant leur granulométrie Download PDF

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Publication number
EP0245744A2
EP0245744A2 EP87106418A EP87106418A EP0245744A2 EP 0245744 A2 EP0245744 A2 EP 0245744A2 EP 87106418 A EP87106418 A EP 87106418A EP 87106418 A EP87106418 A EP 87106418A EP 0245744 A2 EP0245744 A2 EP 0245744A2
Authority
EP
European Patent Office
Prior art keywords
suspension
fine powder
grain size
fractions
height
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.)
Withdrawn
Application number
EP87106418A
Other languages
German (de)
English (en)
Other versions
EP0245744A3 (fr
Inventor
Otto Volz
Enrique Mechau
Werner Lohfink
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.)
Alfred Hempel & Co KG GmbH
Original Assignee
Alfred Hempel & Co KG 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 Alfred Hempel & Co KG GmbH filed Critical Alfred Hempel & Co KG GmbH
Publication of EP0245744A2 publication Critical patent/EP0245744A2/fr
Publication of EP0245744A3 publication Critical patent/EP0245744A3/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D3/00—Differential sedimentation

Definitions

  • the invention relates to a method and a device for separating solid fine powders into particle size fractions.
  • Micro-grains of silicon carbide and electro-corundum in the range from 0 ⁇ m to 1 ⁇ m are currently used to produce so-called "modern ceramics". Obtaining such grain classes by sieving or processes using centrifugal force is extremely complex. In addition, such a grain size distribution is not yet optimal for the desired purposes, because grain classes which are subdivided again are required within this range, for example with grain sizes of 0 ⁇ m to 0.5 ⁇ m and 0.5 ⁇ m to 1 ⁇ m.
  • the object on which the invention is based is therefore to create a method and a device with which large quantities of sub-micro-grain separated according to grain classes can be produced from powdery solid fine powders in an economical manner.
  • This object is achieved in that the fine powder is suspended in a liquid, the suspension is allowed to sediment in a suspension column, suspension fractions are drawn off successively from top to bottom at certain heights of the suspension column after certain sedimentation times and the fine powder contained in each suspension fraction is obtained.
  • This method is carried out with a device which has a columnar suspension container, which has on its upper side a connection for the suspension feed and staggered in height height of slide openings for the respective suspension fraction.
  • the particle size of disperse particles in the size range from approximately 1 to 100 ⁇ m it is already known to produce a uniform slurry of a small amount of the powder to be examined in a suitable dispersion medium and then to allow it to sediment. Since there is a clear connection between the size and density of spherically conceived particles and their sinking speed according to Stokes' law, the percentage distribution of the grain sizes is inferred from the temporal course of the sedimentation (Römpp's Chemistry Lexicon, 7th edition, pages 3151 and 3152) . With this so-called sedimentation analysis, the grain sizes of powders can be determined with the aid of sedimentation, but the extraction of grain size fractions according to the invention cannot be derived from this in an obvious manner.
  • sub-micro-grain can be obtained economically in large quantities from pulverulent ceramic fine powders by grain size class fractions with reasonable effort.
  • micropowder made of silicon carbide, high-grade corundum and tetrasodium diphosphate with a grain size distribution of 0 to 1.5 ⁇ m can be separated into grain size fractions of 0 to 0.5 ⁇ m, 0.5 to 1.0 ⁇ m and 1.0 to 1.5 ⁇ m.
  • the columnar sedimentation container 1 shown in FIG. 1 has an inlet 2 at its height H, an outlet 3 on its underside, an outlet 4 closable by a slide 5 at height H 1 and a slide 7 at height H 2 lockable drain 6.
  • the columnar sedimentation container 1 is filled via the inlet 2 over its entire height H with a suspension which has been produced from a liquid and a solid-fine powder or fine powder mixture of known grain size distribution, for example in the range from 0 to 1.5 ⁇ m.
  • the slide 5 is opened at the outlet 4 at the height H 1 and the suspension fraction located at the height H - H 1 is allowed to run off.
  • the sub-micro-grain obtained from this suspension fraction essentially contains grains with a size of 0 to 0.5 ⁇ m.
  • the suspension column located above the outlet 6 with the height H1-H2 is allowed to run off by opening the slide 7 and further treated.
  • a fine powder with a grain size in the range from 0.5 to 1.0 ⁇ m is obtained.
  • the suspension located in the sedimentation area under the outlet 6 above the height H 2, which contains the coarse fractions containing the grains is withdrawn through outlet 3.
  • Fig. 2 the separation of fine corundum fine dust in grain size fractions is shown schematically.
  • the fine corundum dust stored in a container 10 is emulsified in a high-speed mixer 12 with a suspension liquid which is supplied from a container 11 and can consist of water with additives.
  • additives are, for example, 0.5% of an emulsifier in the form of a sodium salt of a polyalkylnaphthalenesulfonic acid and 0.2% of a sequestering agent.
  • the emulsion or suspension discharged from the mixer 12 passes through the inlet 2 into the columnar sedimentation container 1. After a sedimentation time t 1, the suspension column H - H 1 of FIG.
  • a centrifuge 16 via the outlet 4, which still contains water and drying agent can be supplied from a container 13.
  • the filtrate leaving centrifugation enters a container 14 and is returned to the container 11 via a line 15 for recycling.
  • the particle sludge obtained in the centrifuge 16 is dried in an oven 17 and disintegrates there into a granular powder which is packaged in suitable containers in the station 18 in compliance with the safety regulations for inert dusts.
  • the suspension fraction discharged after the sedimentation time t 1 + t 2 at the outlet 6 by opening the slide 7 with the liquid height H 1 - H 2 is then treated in the same way in the centrifuge 16 and the particle sludge obtained is dried in the oven 17 and in place of a station 18 after determination packed in the grain size distribution.
  • the oversized grain withdrawn from the outlet 3 reaches a container 13 for further processing.
  • ultrasound can be used in the production of the suspension from liquid and fine powder and in the powder extraction after drying.
  • Fine grain fine dust is to be separated into grain size fractions consisting of 40% with a grain size of 0.1 to 0.5 ⁇ m, 35% of 0.5 to 1 ⁇ m, 20% of 1 to 2 ⁇ m, 3% of 2 to 3 ⁇ m and 2% of over 3 ⁇ m.
  • a columnar sedimentation container 1 with a height H of 3 m is used.
  • the drain 4 is at a height H1 of 92 cm, the drain 6 at a height H2 of 33 cm.
  • the suspension column H - H 1 is allowed to run without vortex after a sedimentation time of 30 minutes by opening the slide 5.
  • the fine powder of fine corundum obtained according to the treatment of FIG.

Landscapes

  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
EP87106418A 1986-05-14 1987-05-04 Procédé et dispositif pour séparer des poudres fines solides suivant leur granulométrie Withdrawn EP0245744A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3616300 1986-05-14
DE19863616300 DE3616300A1 (de) 1986-05-14 1986-05-14 Vorrichtung zum trennen von feststoff-feinpulvern in korngroessenfraktionen

Publications (2)

Publication Number Publication Date
EP0245744A2 true EP0245744A2 (fr) 1987-11-19
EP0245744A3 EP0245744A3 (fr) 1989-07-05

Family

ID=6300853

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106418A Withdrawn EP0245744A3 (fr) 1986-05-14 1987-05-04 Procédé et dispositif pour séparer des poudres fines solides suivant leur granulométrie

Country Status (2)

Country Link
EP (1) EP0245744A3 (fr)
DE (1) DE3616300A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645771A1 (fr) * 1989-04-17 1990-10-19 Air Liquide Procede de restructuration d'un ensemble de poudres fines

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869903A (en) * 1972-07-19 1975-03-11 Permutit Co Settling rate tester
US4077874A (en) * 1975-06-19 1978-03-07 Conley Robert F Method removing radioactivity from kaolin
AT371375B (de) * 1980-01-04 1983-06-27 Ruthner Othmar Verfahren und einrichtung zur verarbeitung von muell

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645771A1 (fr) * 1989-04-17 1990-10-19 Air Liquide Procede de restructuration d'un ensemble de poudres fines
EP0394091A1 (fr) * 1989-04-17 1990-10-24 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de restructuration d'un ensemble de particules fines
US5030278A (en) * 1989-04-17 1991-07-09 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Process of restructuring a group of finely divided particles

Also Published As

Publication number Publication date
DE3616300C2 (fr) 1988-02-18
DE3616300A1 (de) 1987-11-19
EP0245744A3 (fr) 1989-07-05

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