EP1401583B1 - Verfahren und vorrichtung zum feinschleifen von mineralteilchen - Google Patents

Verfahren und vorrichtung zum feinschleifen von mineralteilchen Download PDF

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Publication number
EP1401583B1
EP1401583B1 EP02760362A EP02760362A EP1401583B1 EP 1401583 B1 EP1401583 B1 EP 1401583B1 EP 02760362 A EP02760362 A EP 02760362A EP 02760362 A EP02760362 A EP 02760362A EP 1401583 B1 EP1401583 B1 EP 1401583B1
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EP
European Patent Office
Prior art keywords
pellets
fine grinding
balls
grinding method
grinding
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 - Lifetime
Application number
EP02760362A
Other languages
English (en)
French (fr)
Other versions
EP1401583A1 (de
Inventor
Philippe Artru
Merien Ould Rouis
Edouard Landao
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.)
Winoa SA
Original Assignee
Wheelabrator Allevard SA
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 Wheelabrator Allevard SA filed Critical Wheelabrator Allevard SA
Publication of EP1401583A1 publication Critical patent/EP1401583A1/de
Application granted granted Critical
Publication of EP1401583B1 publication Critical patent/EP1401583B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/20—Disintegrating members

Definitions

  • the invention relates to a method of fine grinding of mineral particles by means of a grinder containing grinding bodies comprising steel balls or cast iron, having dimensions of between 20 mm and 120 mm.
  • variable energy In a rotary mill, most of the variable energy is that which is necessary to put the load of the grinding bodies in motion, while the rotational driving energy of the mill itself is predetermined. In case of reduction of the load of the grinding bodies, the necessary energy will be reduced (with equal productivity). This reduction of the load is possible with a smaller grinding medium, which allows more efficient grinding, all other things being equal.
  • the object of the invention is to develop a fine grinding process of mineral particles to obtain optimum performance of the mill with energy saving and increased productivity.
  • the proportion by weight of the balls in the mixture increases in case of decrease of the particle size of the particles at the inlet, and conversely decreases in case of increase of said particle size.
  • the steel or cast iron has a carbon content in the range of 0.6% to 3.5% and can be combined with Cr and / or Mo.
  • the balls undergo, after atomization, a heat treatment for core quenching intended to reinforce the mechanical strength and the corrosion resistance.
  • the invention relates to the fine grinding of mineral particles, in particular rocks, ores, sulphide concentrate or other minerals with a high metallic content, or industrial minerals which have undergone a first size reduction in a primary mill.
  • the dimensions of the mineral particles obtained as a result of this preliminary grinding are generally greater than 50 or 100 microns.
  • the subsequent fine grinding is subsequently carried out in a secondary recirculating rotary mill 12 (closed circuit) to reduce the particle size of the particles at the outlet 14. It is also possible to make use of a mill without recirculation (open circuit, not shown in Figure 1).
  • the primary crusher 10 of the autogenous type is associated with a screen 16 surmounted by a spray bar 18 to separate the solid fragments of rocks by size. The largest fragments are recycled in the primary mill 10, and the finest are sent to the secondary grinding circuit.
  • the base of the screen 16 is connected by a pipe 18 to a recovery tank 20, which is connected by a pump 22 to at least one cyclone separating device 24.
  • Cyclone 24 has a recycling underflow 26 and a discharge overflow 28 for the finished product corresponding to a fine grinding having a particle size of less than 100 microns.
  • a pipe 30 connects the underflow 26 to a feed hopper 32 of the secondary mill 12 to ensure the recycling of too large particles.
  • the secondary crushing mill 12 with a rotating horizontal drum 33 has an inlet 34 connected to the hopper 32, and a longitudinal chamber 35 containing grinding bodies or media constituted by a mixture of balls 36 and steel balls 38.
  • the outlet 14 of the secondary mill 12 is shifted downwardly relative to the level of the inlet 34, and comprises a grid 40 disposed above the recovery tank 20.
  • the balls 36 and the balls 38 are distributed over the entire length of the chamber 35 while remaining stored by gravity at a level of filling set back with respect to the inlet 34 and the outlet 14, said level dependent on the load factor of the load.
  • the particles to be ground are injected into the chamber 35 in the axial direction indicated by the arrow F.
  • the balls 36 of the grinding charge are used in a conventional manner in grinders, and are generally made of steel or cast iron with sizes of between 20 mm and 120 mm.
  • the shape of the balls 36 can be spherical or cylindrical with precise diameters.
  • liquid phase grinding system described above can also be replaced by dry grinding in open or closed circuit with recirculation.
  • the fluid is air.
  • Such a device is particularly suitable for grinding cement.
  • the innovation consists in mixing the balls 38 of smaller sizes with the balls 36 to optimize the reduction ratio of the particles inside the secondary mill 12.
  • the balls 38 have spherical or slightly flattened shapes, with diameters of less than 15 mm.
  • the chemical composition of the balls 38 may be that of steel or cast iron shot, with a carbon content of the order of 0.6% to 3.5%.
  • the steel or cast iron may be alloyed with Cr and / or Mo, or any other element likely to enhance the resistance to wear, corrosion and mechanical shocks occurring during grinding.
  • the balls 38 of steel or cast iron are advantageously obtained by atomization with water or by centrifugation, with a range of variable particle sizes remaining less than 15 mm. After the atomization phase, the balls 38 undergo a selection of the shape, sorting by sizes, and then heat treatments to achieve core hardening intended to standardize the hardness at the periphery and in the center.
  • the minimum cooling rate in the mass of a ball 38 is preferably greater than 10 ° C / second.
  • the proportion by weight of the balls 38 in the mixture with the balls 36 depends on the particle size of the particles at the inlet 34 of the secondary mill 12. It will be larger than the particle size of the particles at the inlet is fine. Conversely, in the event of an increase in the particle size of the particles of the product to be ground, it is necessary to reduce the proportion of the balls 38 with respect to the balls 36. During the rotation of the grinding drum 33, the balls 38 attack the small particles , while the balls 36 are loaded larger particles. The grindability of the product to be milled can also affect the proportion of the beads 38.
  • the balls 38 and the balls 36 of the grinding bodies have an actual density greater than 7.5.
  • the smaller balls 38 will occupy the interstices between the balls 36 so as to increase the bulk density of the charge, and to release of the volume for the pulp 42.
  • the apparent density of the balls (38) must be greater than 4.
  • the diameter of the spherical balls (38) is preferably between 1 mm and 12 mm.
  • the pulp layer 42 exceeds the level of the grinding charge, at a level substantially coplanar with the outlet 14, and below the inlet 34.
  • FIG. 2 shows two diagrams of the reduction ratio of the particles of the product to be ground according to the proportion by weight of the balls 38 in the grinding mixture corresponding to two particle sizes of 160 microns and 370 microns of the particles, and at the same grinding time. of the order of 30 minutes.
  • the reduction ratio of the particles is optimum (about 7.5) when the percentage of beads 38 in the mixture is 60%.
  • the reduction ratio increases linearly by 40% (from 5.3 to 7.5) for a percentage of beads 38 ranging from 0 to 60%.
  • the reduction ratio of the particles is optimum (about 6.2) when the percentage of beads 38 in the mixture is 30%. It then decreases with a slight slope (up to 5.8) when the percentage of beads 38 varies from 30% to 60%. The reduction ratio increases linearly by 16% (from 5.3 to 6.2) for a percentage of beads 38 ranging from 0 to 30%.
  • the vertices A and B of the two curves correspond to the maximum grinding degree of the mill for predetermined particle sizes at the inlet.
  • the optimum final grain size at the outlet of the secondary mill 12 is then of the order of 20 microns following the reduction ratio of 7.5 for an input particle size of 160 microns, and 60 microns following the reduction ratio of 6. , 2 for an input particle size of 370 microns.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (11)

  1. Verfahren zur Feinzerkleinerung mineralischer Teilchen mittels eines Drehzerkleinerers (12), der Zerkleinerungskörper mit Kugeln (36) aus Stahl oder Gusseisen einschließt, deren Abmessungen 20 bis 120 mm betragen, gekennzeichnet durch folgende Schritte, die bestehen
    - in einer Herstellung durch Zerstäubung von Kügelchen aus Stahl (38) mit hohem Kohlenstoffgehalt oder Kügelchen aus Guseisen in einem Korngrößenbereich unter 15 mm
    - und einem Vermischen der Kügelchen (38) mit den Kugeln (36) innerhalb des Zerkleinerers (12) entsprechend einem vorbestimmten Gewichtsverhältnis, das von der Korngröße der zu zerkleinernden Mineralteilchen und vom gewünschten Verkleinerungsgrad abhängt.
  2. Feinzerkleinerungsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass sich der Gewichtsanteil der Kügelchen (38) in der Mischung bei einer geringeren Korngröße der Teilchen beim Eintritt erhöht und umgekehrt im Falle einer größeren Korngröße abnimmt.
  3. Feinzerkleinerungsverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Kohlenstoffgehalt der Kügelchen (38) etwa 0,6 bis 3,5 % beträgt.
  4. Feinzerkleinerungsverfahren nach Anspruch 3, dadurch gekennzeichnet, dass der Stahl oder das Gusseisen der Kügelchen (38) chrom- und/oder molybdänlegiert sein kann.
  5. Feinzerkleinerungsverfahren nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Kügelchen (38) nach dem Zerstäuben eine Wärmebehandlung zur Durchhärtung durchlaufen.
  6. Feinzerkleinerungsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Durchmesser der runden Kügelchen (38) vorzugsweise 1 bis 12 mm beträgt.
  7. Feinzerkleinerungsverfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die zu zerkleinernden Mineralteilchen an der Zuführöffnung (34) des Sekundärzerkleinerers (12) eine Korngröße von über 50 Mikron aufweisen, die nach einer ersten Größenreduzierung in einem Primärzerkleinerer (10) erhalten wurde.
  8. Feinzerkleinerungsverfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Zerkleinerung in einem horizontalen oder vertikalen Zerkleinerer erfolgt.
  9. Feinzerkleinerungsverfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Kügelchen (38) und die Kugeln (36) der Zerkleinerungskörper eine echte Dichte von über 7,5 haben.
  10. Feinzerkleinerungsverfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die sichtbare Dichte der Kügelchen (38) größer als 4 sein muss.
  11. Feinzerkleinerungsverfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass während der Zerstäubungsphase der Kügelchen (38) die Mindestabkühlungsgeschwindigkeit in der Masse vorzugsweise über 10°C/s liegt.
EP02760362A 2001-06-25 2002-06-25 Verfahren und vorrichtung zum feinschleifen von mineralteilchen Expired - Lifetime EP1401583B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0108350 2001-06-25
FR0108350A FR2826299B1 (fr) 2001-06-25 2001-06-25 Procede et dispositif de broyage fin de particules minerales
PCT/FR2002/002197 WO2003000427A1 (fr) 2001-06-25 2002-06-25 Procede et dispositif de broyage fin de particules minerales

Publications (2)

Publication Number Publication Date
EP1401583A1 EP1401583A1 (de) 2004-03-31
EP1401583B1 true EP1401583B1 (de) 2006-03-15

Family

ID=8864731

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02760362A Expired - Lifetime EP1401583B1 (de) 2001-06-25 2002-06-25 Verfahren und vorrichtung zum feinschleifen von mineralteilchen

Country Status (12)

Country Link
US (1) US7093782B2 (de)
EP (1) EP1401583B1 (de)
JP (1) JP4156510B2 (de)
AT (1) ATE320313T1 (de)
BR (1) BR0210639B1 (de)
CA (1) CA2450190C (de)
DE (1) DE60209921T2 (de)
ES (1) ES2260473T3 (de)
FR (1) FR2826299B1 (de)
MX (1) MXPA03011233A (de)
WO (1) WO2003000427A1 (de)
ZA (1) ZA200309746B (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2859722B1 (fr) * 2003-09-15 2006-02-03 Wheelabrator Allevard Materiau composite a haute resistance a l'abrasion, comprenant de la grenaille a base d'acier et procede de fabrication d'un tel materiau
JP5896270B2 (ja) * 2011-09-16 2016-03-30 新東工業株式会社 粉砕メディア、その粉砕メディアを用いた粉砕方法及び粉砕メディアの製造方法
CN103736570B (zh) * 2013-12-13 2015-10-21 郭斐 铁砂颗粒改性加工工艺、铁砂颗粒和破碎机研磨面板
US9943853B2 (en) * 2014-01-16 2018-04-17 Michael Marshall Pulverizing apparatus and method of pulverizing rocks
CN106391221A (zh) * 2016-11-18 2017-02-15 福州恒裕陶瓷有限公司 一种用于陶瓷釉料研磨的球磨机
CN109569809A (zh) * 2018-11-13 2019-04-05 北京国电龙源环保工程有限公司 一种基于大数据的脱硫磨制系统钢球调整方法及系统
CN113731299B (zh) * 2021-08-30 2022-10-18 安徽亚格盛电子新材料有限公司 三甲基铟的粒径控制工艺
CN114471845B (zh) * 2022-02-15 2023-02-10 福建长泰万泰矿物制品有限公司 一种硅土研磨方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE339733C (de) * 1919-12-16 1921-08-04 Martha Buettner Geb Zimmermann Fuellung fuer Rohrmuehlen zur Feinzerkleinerung
US1720024A (en) * 1927-12-03 1929-07-09 American Mangamese Steel Compa Ore mill and grinding element therefor
US1860393A (en) * 1930-05-26 1932-05-31 Allis Chalmers Mfg Co Comminuting body
US2021671A (en) * 1931-01-19 1935-11-19 Skinner Lewis Bailey Manufacture of superphosphates
US2332701A (en) * 1940-06-12 1943-10-26 Charles W Dowsett System and method of grinding
US3027105A (en) * 1960-12-16 1962-03-27 Newton L Hall Rotary grinding mill short-rod and ball type
US3028104A (en) * 1961-06-26 1962-04-03 Newton L Hall Horizontal rotary grinding mill and apparatus inclosing floating-impelling load-rotor
US3486706A (en) * 1967-02-10 1969-12-30 Minnesota Mining & Mfg Ceramic grinding media
DE2251099C3 (de) * 1972-10-18 1979-02-22 Pluess-Staufer Ag, Oftringen, Aargau (Schweiz) Mahlkörper für Mühlen zur Vermahlung von Mineralien
FR2228115B1 (de) * 1973-05-04 1975-11-21 Thome Cromback Acieries
US6070817A (en) * 1988-02-12 2000-06-06 Yanase; Shigeo Pulverizer
DE9410261U1 (de) * 1993-06-29 1994-10-27 Schäfer, Horst, 99762 Niedersachswerfen Anordnung zur Grießmahlung in einer Einkammerrohrmühle
AU2086700A (en) * 1999-01-19 2000-08-07 Magotteaux International S.A. Process of the production of high-carbon cast steels intended for wearing parts

Also Published As

Publication number Publication date
DE60209921D1 (de) 2006-05-11
CA2450190C (en) 2009-09-29
JP2004530551A (ja) 2004-10-07
EP1401583A1 (de) 2004-03-31
WO2003000427A1 (fr) 2003-01-03
ES2260473T3 (es) 2006-11-01
CA2450190A1 (en) 2003-01-03
US20040118954A1 (en) 2004-06-24
US7093782B2 (en) 2006-08-22
ZA200309746B (en) 2004-05-24
BR0210639A (pt) 2004-07-27
MXPA03011233A (es) 2004-10-28
JP4156510B2 (ja) 2008-09-24
FR2826299A1 (fr) 2002-12-27
FR2826299B1 (fr) 2003-09-26
ATE320313T1 (de) 2006-04-15
BR0210639B1 (pt) 2011-01-11
DE60209921T2 (de) 2006-12-14

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