EP0549136A2 - Method for grinding particulate material in a roller press and apparatus for carrying out the method - Google Patents

Method for grinding particulate material in a roller press and apparatus for carrying out the method Download PDF

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Publication number
EP0549136A2
EP0549136A2 EP92310714A EP92310714A EP0549136A2 EP 0549136 A2 EP0549136 A2 EP 0549136A2 EP 92310714 A EP92310714 A EP 92310714A EP 92310714 A EP92310714 A EP 92310714A EP 0549136 A2 EP0549136 A2 EP 0549136A2
Authority
EP
European Patent Office
Prior art keywords
water
roller press
carrying
grinding
added
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Withdrawn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
EP92310714A
Other languages
German (de)
French (fr)
Other versions
EP0549136A3 (en
Inventor
Karl Johan Kromann
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.)
FLSmidth and Co AS
Original Assignee
FLSmidth and Co AS
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 FLSmidth and Co AS filed Critical FLSmidth and Co AS
Publication of EP0549136A2 publication Critical patent/EP0549136A2/en
Publication of EP0549136A3 publication Critical patent/EP0549136A3/en
Withdrawn legal-status Critical Current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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/20—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using rotary pressing members, other than worms or screws, e.g. rollers, rings, discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/06—Selection or use of additives to aid disintegrating

Definitions

  • the present invention relates to a method for grinding particulate material in a roller press.
  • the invention also relates to an apparatus for carrying out the method.
  • a roller press comprises two oppositely rotating rollers, which are forced against one another and against the layer of particulate grinding material between the rollers, this layer being also referred to as the material bed.
  • this object is obtained by a method of the kind mentioned in the introduction, being characterized in that water is added to the grinding material.
  • the present invention is based on the fact that dry, fine-grained materials which contain air, causing them to behave as a liquid, have favourable agglomeration characteristics, and, at the same time, enhanced ability to form a uniform material bed if only a small amount of water is added.
  • a number of tests with grinding of particulate material in a roller press has shown that material bed formation can be improved by adding water to the material and that the vibration level of the roller press is substantially reduced, whereby the roller speed, and hence the capacity of the roller press, can be increased.
  • the tests have shown that the vibration level of the roller press can be halved by adding merely 1.2 per cent water corresponding to 12 litres of water per tonne of material, which is generally equivalent to the effect achievable by a 50 per cent reduction of the roller speed.
  • water is sprayed onto the material at a specific location before the material is introduced into the roller press. It would be advantageous to do this while the material is deposited on a feed belt conveyor or in a supply hopper carrying the material to the roller press.
  • water is continuously added to the material in a smooth, uniform flow, and that the addition of water is controlled as a function of the material feed or alternatively as a function of the vibration level.
  • the quantity of water which should be added depends on the fineness of the material. Therefore, it is a general rule that the greater the fineness of the material, the greater the quantity of water to be added. According to the invention it is preferred that water is added in a quantity between 0 and 30 litres per tonne of material, substantially between 5 and 15 litres per tonne of material.
  • the grinding apparatus should comprise, in addition to a roller press, a supply hopper and/or a feed belt conveyor, also a number of nozzles for addition of water.
  • the illustrated grinding apparatus 1 comprises a roller press 3, a supply hopper 5 and a feed belt conveyor 7.
  • the material to be ground is extracted from a silo 9 onto the feed belt conveyor 7, but the material may also be led directly into the hopper 5 from the silo 9.
  • the apparatus also incorporates a number of nozzles 11 which may be fitted above the feed belt conveyor 7 for water spraying of the material before the material drops into the hopper 5, or a number of nozzles 13 being installed directly in the hopper 5 for water spraying of the material contained in the hopper.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)

Abstract

In order to improve the operation of a roller press, a method is described according to which water is added to the material to be ground.
By this method it is obtained that the material bed formation is improved and that the vibration level of the roller press is reduced, thus making it possible to increase the roller speed and hence the utilization of the roller press capacity.

Description

  • The present invention relates to a method for grinding particulate material in a roller press. The invention also relates to an apparatus for carrying out the method.
  • A roller press comprises two oppositely rotating rollers, which are forced against one another and against the layer of particulate grinding material between the rollers, this layer being also referred to as the material bed.
  • When grinding the material, certain operational problems may occur, involving i.a. vibrations in the roller press, instability in the formation of the material bed and variations in the power consumption of the roller press, and these problems tend to grow as the degree of fineness of the grinding material increases.
  • In practice, the mentioned problems are resolved by reducing the roller speed to a level where the vibration level and other operating parameters of the roller press are acceptable. In connection with the grinding of very fine material, where the greatest problems occur, it is, however, a disadvantage that the roller speed has to be reduced so much that the capacity utilization of the roller press is reduced to an unacceptable extent.
  • Therefore it is the object of the present invention to provide a method whereby the aforementioned problems can be avoided, hence resulting in optimum utilization of the roller press capacity.
  • According to the invention this object is obtained by a method of the kind mentioned in the introduction, being characterized in that water is added to the grinding material.
  • The present invention is based on the fact that dry, fine-grained materials which contain air, causing them to behave as a liquid, have favourable agglomeration characteristics, and, at the same time, enhanced ability to form a uniform material bed if only a small amount of water is added.
  • A number of tests with grinding of particulate material in a roller press has shown that material bed formation can be improved by adding water to the material and that the vibration level of the roller press is substantially reduced, whereby the roller speed, and hence the capacity of the roller press, can be increased.
  • In fact, the tests have shown that the vibration level of the roller press can be halved by adding merely 1.2 per cent water corresponding to 12 litres of water per tonne of material, which is generally equivalent to the effect achievable by a 50 per cent reduction of the roller speed.
  • To ensure that the water is properly mixed with the grinding material, it is preferred that water is sprayed onto the material at a specific location before the material is introduced into the roller press. It would be advantageous to do this while the material is deposited on a feed belt conveyor or in a supply hopper carrying the material to the roller press.
  • In order to achieve the optimum effect of the water addition, it is preferred that water is continuously added to the material in a smooth, uniform flow, and that the addition of water is controlled as a function of the material feed or alternatively as a function of the vibration level.
  • The quantity of water which should be added depends on the fineness of the material. Therefore, it is a general rule that the greater the fineness of the material, the greater the quantity of water to be added. According to the invention it is preferred that water is added in a quantity between 0 and 30 litres per tonne of material, substantially between 5 and 15 litres per tonne of material.
  • In order that water can be added, it is preferred that the grinding apparatus should comprise, in addition to a roller press, a supply hopper and/or a feed belt conveyor, also a number of nozzles for addition of water.
  • The invention will now be described in further details in the following with reference to the accompanying drawing, being diagrammatical and showing a grinding apparatus for carrying out the method according to the invention.
  • The illustrated grinding apparatus 1 comprises a roller press 3, a supply hopper 5 and a feed belt conveyor 7. The material to be ground is extracted from a silo 9 onto the feed belt conveyor 7, but the material may also be led directly into the hopper 5 from the silo 9.
  • According to the invention the apparatus also incorporates a number of nozzles 11 which may be fitted above the feed belt conveyor 7 for water spraying of the material before the material drops into the hopper 5, or a number of nozzles 13 being installed directly in the hopper 5 for water spraying of the material contained in the hopper.

Claims (8)

  1. A method for grinding particulate material in a roller press, characterized in, that water is added to the material to be ground.
  2. A method according to claim 1, characterized in, that the water is sprayed onto the material at a specific location before the material is introduced into the roller press.
  3. A method according to claims 1 or 2, characterized in, that water is sprayed onto the material while the material is deposited on a feed belt conveyor carrying the material to the roller press.
  4. A method according to claims 1 or 2, characterized in, that water is sprayed onto the material while the material is deposited in a supply hopper carrying the material to the roller press.
  5. A method according to claims 1-4, characterized in, that water is continuously added to the material in a smooth uniform flow, and that the addition of water is controlled as a function of the material supply.
  6. A method according to claims 1-4, characterized in, that water is continuously added to the material in a smooth uniform flow, and that the water injection is controlled as a function of the vibration level.
  7. A method according to claim 5 or 6, characterized in, that the water addition rate is between 0 and 30 litres per tonne of material, preferably between 5 and 15 litres per tonne of material.
  8. An apparatus for carrying out the method as claimed in any of the preceding claims comprising a roller press, a supply hopper and/or a feed belt conveyor, characterized in, that it incorporates also a number of nozzles (11, 13) for addition of water to the material to be ground.
EP19920310714 1991-12-23 1992-11-24 Method for grinding particulate material in a roller press and apparatus for carrying out the method Withdrawn EP0549136A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK2055/91 1991-12-23
DK205591A DK205591A (en) 1991-12-23 1991-12-23 PROCEDURE FOR GRINDING PARTICULATED MATERIAL IN A ROLLING PRESSURE, AND DEVICE FOR EXERCISING THE PROCEDURE

Publications (2)

Publication Number Publication Date
EP0549136A2 true EP0549136A2 (en) 1993-06-30
EP0549136A3 EP0549136A3 (en) 1993-11-03

Family

ID=8109757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920310714 Withdrawn EP0549136A3 (en) 1991-12-23 1992-11-24 Method for grinding particulate material in a roller press and apparatus for carrying out the method

Country Status (5)

Country Link
EP (1) EP0549136A3 (en)
JP (1) JPH05245403A (en)
KR (1) KR930012283A (en)
DK (1) DK205591A (en)
MX (1) MX9207011A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104874469A (en) * 2015-06-16 2015-09-02 鞍钢集团矿业公司 Automatic spraying system and control method for crusher cavity and belt conveyor
CN105268509A (en) * 2015-11-03 2016-01-27 中建材（合肥）粉体科技装备有限公司 Vibrating and air exhausting device of roller press

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW466136B (en) * 2000-01-28 2001-12-01 F L Smidth & Amp Co As Method and apparatus for grinding of particulate material
CN106807527A (en) * 2015-12-01 2017-06-09 衡阳双雁运输机械有限公司 A kind of high capacity crusher
CN112403631A (en) * 2020-10-28 2021-02-26 衡阳圣堂科技有限公司 Palm type recording device for customer information

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1444809A (en) * 1965-05-24 1966-07-08 Stein & Roubaix Improvements to pendulum mills
US3697003A (en) * 1970-02-04 1972-10-10 Industrial Nucleonics Corp Grinding mill method and apparatus
FR2320138A1 (en) * 1975-08-04 1977-03-04 Dessau Zementanlagenbau Veb PROCESS AND DEVICE FOR THE FINE GRINDING OF MINERAL SUBSTANCES
FR2381569A1 (en) * 1977-02-24 1978-09-22 Schoenert Klaus FINE AND VERY FINE GRINDING PROCESS OF FRAGILE MATERIALS
EP0066392A2 (en) * 1981-06-02 1982-12-08 General Comminution Inc. Comminution process
DE3337615A1 (en) * 1983-10-15 1985-04-25 Klöckner-Humboldt-Deutz AG, 5000 Köln Process and plant for comminuting, grinding and treating raw mineral materials, such as ores and the like, which are wet from the mine or naturally
EP0238432A2 (en) * 1986-02-14 1987-09-23 Nordberg Inc. Method and apparatus for energy efficient comminution
EP0527333A1 (en) * 1991-08-14 1993-02-17 Krupp Polysius Ag Method and installation for breaking up brittle material

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1444809A (en) * 1965-05-24 1966-07-08 Stein & Roubaix Improvements to pendulum mills
US3697003A (en) * 1970-02-04 1972-10-10 Industrial Nucleonics Corp Grinding mill method and apparatus
FR2320138A1 (en) * 1975-08-04 1977-03-04 Dessau Zementanlagenbau Veb PROCESS AND DEVICE FOR THE FINE GRINDING OF MINERAL SUBSTANCES
FR2381569A1 (en) * 1977-02-24 1978-09-22 Schoenert Klaus FINE AND VERY FINE GRINDING PROCESS OF FRAGILE MATERIALS
EP0066392A2 (en) * 1981-06-02 1982-12-08 General Comminution Inc. Comminution process
DE3337615A1 (en) * 1983-10-15 1985-04-25 Klöckner-Humboldt-Deutz AG, 5000 Köln Process and plant for comminuting, grinding and treating raw mineral materials, such as ores and the like, which are wet from the mine or naturally
EP0238432A2 (en) * 1986-02-14 1987-09-23 Nordberg Inc. Method and apparatus for energy efficient comminution
EP0527333A1 (en) * 1991-08-14 1993-02-17 Krupp Polysius Ag Method and installation for breaking up brittle material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104874469A (en) * 2015-06-16 2015-09-02 鞍钢集团矿业公司 Automatic spraying system and control method for crusher cavity and belt conveyor
CN105268509A (en) * 2015-11-03 2016-01-27 中建材（合肥）粉体科技装备有限公司 Vibrating and air exhausting device of roller press

Also Published As

Publication number Publication date
DK205591A (en) 1993-06-24
DK205591D0 (en) 1991-12-23
KR930012283A (en) 1993-07-20
MX9207011A (en) 1993-06-01
JPH05245403A (en) 1993-09-24
EP0549136A3 (en) 1993-11-03

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