EP1808231A1 - Séparation de minéraux - Google Patents

Séparation de minéraux Download PDF

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Publication number
EP1808231A1
EP1808231A1 EP07000053A EP07000053A EP1808231A1 EP 1808231 A1 EP1808231 A1 EP 1808231A1 EP 07000053 A EP07000053 A EP 07000053A EP 07000053 A EP07000053 A EP 07000053A EP 1808231 A1 EP1808231 A1 EP 1808231A1
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EP
European Patent Office
Prior art keywords
jet mill
grinding
fluidized bed
fraction
fine
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Withdrawn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
EP07000053A
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German (de)
English (en)
Inventor
Josef Fischer
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Lehigh Technologies Inc
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1808231A1 publication Critical patent/EP1808231A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • B02C19/068—Jet mills of the fluidised-bed type

Definitions

  • the invention relates to a method for obtaining a mineral substance in a fine-grained end product fraction of high purity from a contaminated, the substance containing low purity bulk material according to the preamble of claim 1 and a device suitable therefor according to the preamble of claim 8.
  • clay mineral bentonite has been used in construction engineering, e.g. as a lubricant when driving through tunnels and pipes, or as support fluid in unsupported holes and diaphragm walls.
  • clay mineral bentonite is more and more used as a paper and paint or color additive in paper and printing technology and as a filler for whitening tablets in drug production or as a food additive.
  • bentonite contains as the most important constituent in a concentration of 60 to 80% of the clay mineral montmorillonite (A 2 [(OH) 2 Si 4 O 10 ] nH 2 O) which is particularly swellable and considerable amounts of water, alcohols, glycols , Ammonium compounds, etc., and is therefore suitable for use as a binder, gelling agent, dye, etc. in the abovementioned fields of use.
  • bentonite also contains other accompanying minerals, in particular quartz, mica, feldspar or pyrite, which have neither the high swelling capacity nor the white color of montmorillonite, but a high hardness and low surface area, so that they can be used in the end product the above-mentioned applications are not suitable.
  • Air separators serve to separate a coarse material fraction from a fine material fraction from a heterogeneous mixture of different particle size.
  • the discontinued bulk material is already a relatively finely ground mixture, ie a u. U. in a further process step pre-milled mixture.
  • the granules to be applied to the separator are obtained by a milling process on a ball mill, whereas jet mills have hitherto been used for grinding high-purity substances such as phosphor powder or metal powder.
  • a fluidized bed counter-jet mill with which heterogeneous compositions such as bentonite can be ground is the German patent application DE 195 48 869 A1 refer to.
  • a nozzle at the bottom of the grinding chamber and an annular nozzle around the grinding chamber around the abandoned millbase is repeatedly blown into the grinding area, where it is crushed by clashing of the individual grains and entrained in the upward air flow.
  • a sifter unit is arranged above the grinding chamber. If the entrained single grain is fine enough that it does not sink back into the grinding area due to its gravity and diameter below the classifier separation limit, it will be discharged as fines on the classifier.
  • the entrained single grain is too heavy, because it was not grinded far enough in the previous grinding, it is blown through the floor nozzle again and again into the grinding area until grains from a hard-to-grind fabric fraction reach the necessary fineness Classifier to be discharged.
  • German patent application DE 38 25 469 A1 has already proposed a method for dispersing, selective comminution and screening of solids, and a sifting mill on which this method can be carried out.
  • the classifier jet mill has a dispersing space with nozzles arranged annularly around it.
  • the bottom of the dispersion chamber has a gap through which secondary gas is supplied.
  • the Mahlgutteilchen be accelerated concentrically by the grinding gas from the annularly arranged nozzles and thereby crushed on impact with each other.
  • the exhaust air is removed with the resulting fines upwards.
  • agglomerates also fall through the gap, which were not adequately dispersed in the first grinding operation or which did not even get into the grinding. Once these agglomerates have landed in the collecting container, no further processing takes place. In particular with coarser bulk material, this selection of agglomerates results in a high loss of material, since the agglomerates can contain a high proportion of the substance to be recovered, which is now discharged with the coarse material.
  • the residence time of a particle in the dispersion chamber depends on how far away from the gap it ends up after the grinding process, or whether it lands on the gap or next to it and then possibly. is whirled up again. This leads to a fuzzy selection, since actually perspectivesselektierende particles are fed to the re-grinding.
  • the different grinding properties of the substance contained in the fine-grained end product fraction with a high degree of purity and the impurities contained in the starting bulk material used for a selection or fractionation of the bulk material during a grinding operation The inventor has recognized that the grindability, ie the fineness of the final product after milling with a given force is well suited to select mineral mixtures, especially bentonite in the fractions contained.
  • the process according to the invention has proved to be effective, in particular in experiments with a raw bentonite starting material, in order to obtain a fine-grained end product with a high degree of purity of montmorillonite.
  • inventive method for separating other mineral mixtures and granules containing ingredients of different grindability.
  • mixtures of silicates, quartzes and other clay minerals are suitable.
  • the grinding is carried out on a fluidized bed counter-jet mill, which has a separating section above a separating device and in deviation from known fluidized bed counter-jet mills of this type and a Grobgutaustrag.
  • the bulk material to be ground is applied to a Mahlgutiergabe and passes from there into a grinding area around which are arranged compressed air nozzles whose compressed air jets detect the discontinued bulk particles and accelerate in a concentric direction so that they collide against each other and thereby crushed ,
  • a riser region adjoins the grinding region, wherein above the riser region, for example, an air classifier wheel is arranged as a separating device, which produces an upward air flow which entrains the comminuted particles.
  • Finely ground particles having a large mass-related surface are discharged through a fines exit at the top of the jet mill via a fines separator, whereas particles having a lower fineness begin to sink back to the normal range at a height corresponding to their weight or mass surface.
  • the very heavy particles entrained upward in the air stream are already reversing in the riser area and drop back into the grinding area and are fed to a new grinding process for further dispersion.
  • the remaining particles reach the separating device which, depending on the set separation limit, supplies particles below the set particle size to the fine material discharge.
  • the coarser particles are returned to the milling area.
  • the heavier and the coarser particles are subjected to a new grinding in the grinding area and sucked again into the riser area, etc., until particles of particularly heavy fractions settle down in the grinding area and are discharged at the coarse material discharge.
  • a multiple selection is achieved: In the riser region, a gravity direction which precedes the separation device takes place, which is more or less strong depending on the height of the riser region. This is followed by an upper grain boundary in the above separating device, depending on the set separation limit. In the milling area, further separation of particles of particularly heavy substance fractions into the coarse material discharge takes place.
  • agglomerates reliably become so far grind until the soft and thus more easily grindable fractions are present in particulates which are small and light enough to pass to the fines effluent and the hard and difficult to grind particles hard enough to fall from the grind area into the coarse crop effluent. In this way, in addition to a particularly high yield of the fine-grained end product fraction to be obtained excellent selectivity and a particularly high degree of purity of the final product with respect to the impurities still contained succeed.
  • montmorillonite particles having a density of 1.7-2.7 g / cm 3 and a hardness of 1-2 become stronger on impact with particles accelerated in the opposite direction by the compressed air and into smaller units atomized as contained in the bentonite starting bulk quartets with a hardness (Mohs) of 7 or pyrite (Mohs hardness of 6 to 6.5, density 4.95 to 5.2 g / cm 3 ) or the like.
  • the particles of these hard materials produced after the impact have not only a comparatively large dimension or large volumes due to the greater hardness and therefore relatively low atomization due to the impact, but also a relatively high density, so that the maximum rise in height Rising range of the jet mill is limited. In this way, it is possible to selectively mill a mineral mixture with different ingredients, especially for smaller batch sizes.
  • the Grobgutaustragen be carried out continuously or intermittently, what advantageous a Grobgutaustragsorgan is connected to the Grobgutaustrag, such as a rotary valve. It is particularly advantageous if the Speed of the rotary valve and thus the flow rate at the coarse material discharge can be controlled. This is because the coarse material throughput, together with further mill parameters, such as, for example, air pressure at the compressed air nozzles, rise height of the riser area and speed of the air classifier determine the result of the grinding and, in particular, the selection effect of the proposed selective grinding method.
  • a control unit for controlling or regulating the throughput of Grobgutaustragsorgans and / or the other mill parameters is provided with the example, the speed of the rotary valve is controlled or regulated according to the desired end product.
  • samples can be taken from the final product and checked for their degree of fineness, whereupon the throughput of coarse material discharge and the speed of the rotary valve is controlled accordingly.
  • the sampling and determination of the degree of purity can also be provided continuously, so that it can be made the basis of a regulation of the coarse material throughput.
  • the sample purity can be determined for example by a hydrochloric acid bath of the respective sample.
  • the fluidized bed counter-jet mill is recessed on the underside, for example funnel-shaped or dome-shaped, so that the material sinking from the riser area can settle there without being immediately exposed to renewed turbulence in the grinding area of the fluidized bed counterjet mill.
  • the subject of claim 7, however, is the conversion of a conventional fluidized bed counter jet mill on a selectively working fluidized bed counter-jet mill according to the invention, as well as the implementation of the inventive method on such a converted fluidized bed counter-jet mill.
  • the single FIGURE shows a vertical section through a fluidized bed opposed jet mill according to the invention with coarse material discharge.
  • Fluid bed counter-jet mills are conventionally used for crushing various soft and / or brittle and / or hard bulk materials, such as various minerals and mineral mixtures, glass, rock, wax, resin, metal and the like.
  • the basic structure and the mode of action of such arrangements are known per se.
  • the figure underlying fluidized bed counter-jet mill consists in a conventional manner of a arranged with a vertical axis, pot-like housing 1 containing a lower Mahl Scheme 2, an upper separation region 3 and between the distance between Mahl Society 2 and 3 Separationsberich bridging riser area 4.
  • the said areas are arranged coaxially one above the other.
  • the grinding area 2 are associated with the radial axis and coplanar arranged, attached to the peripheral boundary of the grinding area 2 grinding nozzles 5. These can be acted upon with compressed air.
  • the housing 1 is suitably provided in the region of the riser 4 comprehensive, connectable to a compressed air source ring line 6, depart from the nozzle 5 leading stub lines 7.
  • the compressed air is expediently compressed to a pressure of 3 to 6 bar.
  • the grinding area expediently has a circular cross section. But other cross-sectional shapes, such as ellipsoidal or polygonal are conceivable.
  • the separation region 3 contains a separating device 8, which is arranged with an expediently arranged above the housing 1 and not shown in greater detail here.
  • This separating device is preferably designed as an air classifier.
  • the separating device 8 contains an outwardly leading outlet nozzle 9 for the finely ground and separated from the impurities in the starting bulk material.
  • the riser 4 is formed as a simple shaft.
  • the product feed takes place above the grinding area 2.
  • a feed nozzle 10 opening into the riser area 4 is provided.
  • This may be assigned to a shut-off device, not shown here, which is controllable so that the existing material in the housing 1 remains largely constant.
  • the housing 1 can be easily accommodated on load cells 11, by which said shut-off device can be controlled. It would also be conceivable to provide other level detectors, such as capacitive or inductive probes.
  • the grinding area 2 has in its lower region a funnel-shaped recess 17 which serves as a "sump" for receiving the falling down from the starting bulk material during grinding down impurities, so that this settling can be whirled up again without further in the course of the further grinding process and further to become. Furthermore, the grinding area below the recess 17 is provided with a Grobgutaustragflansch or -stutzen 23, to which a rotary valve 24 is connected, through which the separated as contamination of the fine coarse material is discharged.
  • the contained montmorillonite particles upon impact with other montmorillonite particles but especially on impact with the harder quartz, pyrite or other particles, while the particles of hard material do not fragment into smaller particles than the montmorillonite particles upon impact with other particles of hard material, especially soft montmorillonite particles.
  • the individual particles of the ground material therefore hit each other in the effective range of the compressed air jets 12 with relatively strong pulse and are accordingly intensively crushed, so that the desired atomization of the end product forming substance and its separation from the other ingredients of the starting orfact guts with a high Throughput is achieved.
  • the indicated in the figure by the flow arrows 22, via the inlet cross section 13 in the riser 4 entering air decreases the fine-grained end product with and this leads to the separating device 8.
  • the fine grain fraction of the flow reaching the riser region 4 is very high, so that a comparatively small overall height of the riser region 4 is advantageously sufficient.
  • the substance which is to be present in the final product in a high degree of purity is obtained at the coarse material discharge, in other words that a mineral substance is separated from a feed bulk material (a material mixture containing at least one mineral), which is inferior is grindable as its accompanying substances.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP07000053A 2006-01-14 2007-01-03 Séparation de minéraux Withdrawn EP1808231A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610001937 DE102006001937A1 (de) 2006-01-14 2006-01-14 Trennen von Mineralien

Publications (1)

Publication Number Publication Date
EP1808231A1 true EP1808231A1 (fr) 2007-07-18

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ID=37836982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07000053A Withdrawn EP1808231A1 (fr) 2006-01-14 2007-01-03 Séparation de minéraux

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EP (1) EP1808231A1 (fr)
DE (1) DE102006001937A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106076561A (zh) * 2016-07-28 2016-11-09 李绍光 一种粒度可连续调节的气流粉碎机
CN108672022A (zh) * 2018-06-29 2018-10-19 刘寒 一种适用于消石灰磨粉的雷蒙磨机及其工作方法
US10232381B2 (en) 2014-12-19 2019-03-19 Halliburton Energy Services, Inc. Purification of organically modified surface active minerals by air classification
CN110215994A (zh) * 2019-06-14 2019-09-10 安吉县宇宏粘土化工有限公司 膨润土加工工艺
WO2020034023A1 (fr) * 2018-08-15 2020-02-20 Hatch Ltd. Système et procédé de valorisation des minerais par ablation à sec
EP3613508A1 (fr) * 2018-08-23 2020-02-26 NETZSCH Trockenmahltechnik GmbH Procédé et dispositif de décharge des particules difficilement broyables d'un désintégrateur à jet hélicoïdal
CN114308318A (zh) * 2021-12-25 2022-04-12 河北光太路桥工程集团有限公司 一种带有减震装置的制砂机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013002237B3 (de) * 2013-02-11 2014-05-22 Microtec Gmbh Sichtermühle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19718668A1 (de) * 1997-05-02 1998-11-05 Hosokawa Alpine Ag Verfahren zum Trennen und kontinuierlichen Austragen von schwer dispergierbaren Bestandteilen
EP0888818A1 (fr) * 1997-07-03 1999-01-07 HOSOKAWA ALPINE Aktiengesellschaft Procédé et dispositif de broyage à jet à lit fluidisé
DE10045160A1 (de) 2000-08-14 2002-03-07 Ulf Noll Gmbh Multifunktionale Vorrichtung zum Mahlen, Sichten, Mischen und/oder Desagglomerieren
DE10116483A1 (de) * 2001-04-03 2002-10-17 Josef Fischer Vorrichtung zum Zerkleinern von Schüttgut

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3825469A1 (de) * 1988-07-27 1990-02-01 Basf Ag Verfahren zur dispergierung, zerkleinerung bzw. desagglomeration und sichtung von feststoffen
DE19548869A1 (de) * 1995-12-27 1997-07-03 Sueddeutsche Kalkstickstoff Fließbett-Gegenstrahlmühle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19718668A1 (de) * 1997-05-02 1998-11-05 Hosokawa Alpine Ag Verfahren zum Trennen und kontinuierlichen Austragen von schwer dispergierbaren Bestandteilen
EP0888818A1 (fr) * 1997-07-03 1999-01-07 HOSOKAWA ALPINE Aktiengesellschaft Procédé et dispositif de broyage à jet à lit fluidisé
DE10045160A1 (de) 2000-08-14 2002-03-07 Ulf Noll Gmbh Multifunktionale Vorrichtung zum Mahlen, Sichten, Mischen und/oder Desagglomerieren
DE10116483A1 (de) * 2001-04-03 2002-10-17 Josef Fischer Vorrichtung zum Zerkleinern von Schüttgut

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10232381B2 (en) 2014-12-19 2019-03-19 Halliburton Energy Services, Inc. Purification of organically modified surface active minerals by air classification
CN106076561A (zh) * 2016-07-28 2016-11-09 李绍光 一种粒度可连续调节的气流粉碎机
CN108672022A (zh) * 2018-06-29 2018-10-19 刘寒 一种适用于消石灰磨粉的雷蒙磨机及其工作方法
WO2020034023A1 (fr) * 2018-08-15 2020-02-20 Hatch Ltd. Système et procédé de valorisation des minerais par ablation à sec
EP3613508A1 (fr) * 2018-08-23 2020-02-26 NETZSCH Trockenmahltechnik GmbH Procédé et dispositif de décharge des particules difficilement broyables d'un désintégrateur à jet hélicoïdal
JP2020028877A (ja) * 2018-08-23 2020-02-27 ネッチュ トロッケンマールテヒニク ゲーエムベーハー 粉砕困難な粒子をスパイラルジェットミルから排出するための方法及び装置
CN110215994A (zh) * 2019-06-14 2019-09-10 安吉县宇宏粘土化工有限公司 膨润土加工工艺
CN114308318A (zh) * 2021-12-25 2022-04-12 河北光太路桥工程集团有限公司 一种带有减震装置的制砂机
CN114308318B (zh) * 2021-12-25 2023-07-04 河北光太路桥工程集团有限公司 一种带有减震装置的制砂机

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