EP0535699B1 - Procédé de mélange et de granulation d'une matière pulvérulente - Google Patents

Procédé de mélange et de granulation d'une matière pulvérulente Download PDF

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Publication number
EP0535699B1
EP0535699B1 EP19920116911 EP92116911A EP0535699B1 EP 0535699 B1 EP0535699 B1 EP 0535699B1 EP 19920116911 EP19920116911 EP 19920116911 EP 92116911 A EP92116911 A EP 92116911A EP 0535699 B1 EP0535699 B1 EP 0535699B1
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EP
European Patent Office
Prior art keywords
drum
powder materials
cylinder
cylinders
materials
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
EP19920116911
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German (de)
English (en)
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EP0535699A1 (fr
Inventor
Takazo Kawaguchi
Masaru Matsumura
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.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
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Publication date
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Publication of EP0535699A1 publication Critical patent/EP0535699A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating

Definitions

  • the present invention relates to a method for mixing and granulating powder materials, such as in the preparation of sintering mixes which are used to produce sintered ores. More particularly, it is concerned with a mixing and granulating method and apparatus which are capable of granulating two or more classes or sets of powder materials Simultaneously and separately using a multi-cylinder drum mixer having a plurality of coaxially rotating cylinders.
  • a sintering mix which primarily comprises a fine iron ore is initially prepared by mixing the fine iron ore with various additives such as limestone, coke breeze, and return fines and granulating (pelletizing) the mixture by aid of moisture.
  • Some sintering mixes contain slaked lime or quicklime as a binder and various iron-containing dusts collected in a steelwork may be added to sintering mixes as an iron source. The granulated sintering mix is then fired to produce a sintered ore.
  • a sintering mix used in the production of a sintered ore consists of a wide variety of powder materials, which are mixed and granulated together in a mixing and granulating apparatus such as a peg mill, pan pelletizer, drum mixer, or Eirich mixer.
  • the double-layer sintering method comprises forming an upper layer of a coke-rich sintering mix and a lower layer of a coke-lean sintering mix on a sintering pallet to be placed into a firing furnace.
  • the separated granulation method comprises granulating a high-CaO sintering mix and a low-CaO sintering mix separately and mixing the resulting granulated sintering mixes in preparation for firing them together.
  • the fine ores be separated into two or more classes depending on the degree of water absorption and each class of fine ores be granulated separately while water is added in an amount sufficient to form a sintering mix having an optimum moisture content.
  • the resulting two or more granulated sintering mixes are then mixed and fired together.
  • each of the sintering mixes which are prepared separately requires at least one mixer or pelletizer (hereinafter collectively referred to as a mixer) in which raw powder materials are mixed and granulated to form the sintering mix.
  • a mixer a mixer or pelletizer
  • the number of mixers to be installed is equal to or larger than the number of sintering mixes to be prepared.
  • Drum mixers which comprise an inclined rotating cylindrical drum, are the most popular due to their high production efficiency. In a drum mixer, while the fine iron ore and other materials charged are being tumbled in the rotating drum from the higher end to the opposite lower end, they are mixed uniformly and granulated.
  • Figure 3(a) is a schematic vertical sectional view of a conventional drum mixer having an inclined rotating drum 2. Fine iron ore and other powder materials 6 are fed through a hopper 1 into the rotating drum 2 at one end thereof and an appropriate amount of water is added to the materials through a water nozzle 3 for moistening. While the moist powder materials are being tumbled in the rotating drum 2 toward the opposite outlet end 19, they are granulated into pellets and discharged from the drum through the outlet end. The drum 2 is inclined such that the outlet end 19 is slightly lower than the opposite inlet end.
  • Figure 3(b) is a cross-section taken along line B-B in Figure 3(a), which shows the rolling of materials 6 in the rotating drum 2.
  • Such a conventional drum mixer used to granulate sintering mixes in the production of sintered ores usually has a drum diameter of about 2 - 5 meters and an angle of drum inclination of about 1° - 5° and is operated at a rotational speed of about 5 - 10 rpm.
  • the space factor of the drum i.e., the proportion of the space within the drum occupied by the materials being processed, is usually on the order of 10% since a larger space factor causes a loss in mixing and granulating efficiency in the drum. Therefore, the remaining approximately 90% of the space is not used at all.
  • the granulating efficiency is improved with an increasing diameter of the drum since the rolling distance of the powder materials therein is increased.
  • a large drum requires an increased costs and space for installation and an increased power for operation.
  • an apparatus for sintering ores having an outer cylinder and an inner cylinder which are coaxially arranged and rotate synchronously. Powder materials are fed into the cylinders by means of separate hoppers and moved toward the lower end of the cylinders where they are fed into a common cylinder where they are mixed together.
  • the main purpose of the inner and the outer cylinders is to preheat the fed charges whereas granulations substantially take place in the mixing cylinder.
  • Another object of the invention is to provide a drum mixer-type apparatus for mixing and granulating powder materials in which the space factor and hence the granulation efficiency are increased, thereby making it possible to process an increased amount of powder materials in a single drum mixer having the same outer dimensions as conventional drum mixers.
  • the present invention as characterized in claim 1 provides a method of mixing and granulating powder materials, using a multi-cylinder drum having a plurality of concentric cylinders connected to one another, the multi-cylinder drum being rotating around the common longitudinal axis of the concentric cylinders which is downwardly inclined with respect to the horizontal in the moving direction of materials, and separately feeding a plurality of sets of powder materials which may have different properties into a plurality of sections defined by the plurality of cylinders within the multi-cylinder drum through one end of the drum, thereby forcing the powder materials to move to the opposite end of the rotating drum while rolling therein to mix and granulate the plurality of sets of powder materials separately in the individual sections.
  • the difference in properties between the plurality of sets of powder materials is the CaO contents.
  • the multi-cylinder drum is a double-cylinder drum having an inner and an outer cylinders, and the difference in properties between the plurality of sets of powder materials are the CaO contents wherein a set of powder materials of a high-CaO content are fed into the inside of the inner cylinder and another set of powder materials of a low-CaO content are fed into the space between the inner and outer cylinders.
  • a water nozzle for moistening the powder materials fed into the drum is preferably provided for each section within the multi-cylinder drum.
  • all of the plurality of concentric cylinders extend for the entire length of the drum.
  • the multi-cylinder drum has a front zone located on the material feeding side and a rear zone located on the material discharging side wherein the front zone of the drum is comprised of the plurality of concentric cylinders and the rear zone of the drum is comprised solely of the cylinder having the largest diameter among the plurality of cylinders.
  • the outermost cylinder extends for the entire length of the drum and the other cylinders do not extend to the rear zone.
  • FIGS 1(a) and 1(b) schematically show a mixing and granulating apparatus according to the present invention.
  • the apparatus is a drum mixer having a double-cylinder structure, i.e., a double-cylinder drum which comprises an outer cylinder 2 and an inner cylinder 9 arranged such that the two cylinders are concentric, i.e., have a common longitudinal axis 5 and define a cross section of concentric circles.
  • both the cylinders 2, 9 extend for the entire length of the drum.
  • the inner cylinder 9 is secured to the outer cylinder 2 by supporting rods 8.
  • the inner cylinder 9 and the outer cylinder 2 define two sections in the drum, i.e., the section inside the inner cylinder 9 indicated by a (hereinafter referred to as inner section) and the section between the two cylinders indicated by b (hereinafter referred to as outer section).
  • the end of the double-cylinder drum on the material feeding (inlet) side is provided with hoppers 11, 12, which are adapted to feed two sets of powder materials 13, 14 separately into the individual sections of the drum defined by the inner and outer cylinders, i.e., the inner section a and the outer section b , respectively.
  • each of the inner and outer sections is provided with a hopper and a water nozzle such that two sets of powder materials can be mixed and granulated in the inner and outer sections separately.
  • the outer cylinder 2 is supported by a supporting roller 10 and a driving gear 4 and it is rotatable by rotating the driving gear 4 by means of a motor 7.
  • the powder materials 13, 14 fed into the respective sections and moistened therein are forced to move toward the opposite ends of the inner and outer cylinders while being rolled.
  • both the inner and outer cylinders 9, 2 are slightly inclined such that their common longitudinal axis 5 has a downward inclination toward the material discharging (outlet) ends 15, 16 of the cylinders.
  • Figure 1(b) shows the rolling of the two sets of powder materials 13, 14 within the two sections a , b defined by the inner and outer cylinders 9, 2.
  • the two sets of powder materials may have different CaO contents, i.e., one being powder materials of a high CaO content and the other being powder materials of a low CaO content.
  • the high-CaO powder materials be fed into the inner section a and the low-CaO powder materials be fed into the outer section b .
  • the outer cylinder 2 and the inner cylinder 9 are rotated synchronously and the rolling distance of material in the inner section a is shorter than that in the outer section b .
  • the granulation ability of powder materials tends to depend on the CaO content thereof.
  • the granulation ability of the powder materials of a low-CaO formulation is relatively poor compared to that of the powder materials of a high-CaO formulation.
  • both sets of the powder materials can be granulated sufficiently and relatively evenly.
  • the space factor of the drum mixer is as low as about 10% when it is used to granulate powder materials and there is no appreciable adverse effect on granulation of the use of a double-cylinder drum.
  • a multi-cylinder drum having three or more cylinders can be used to mix and granulate three or more sets of powder materials separately at the same time.
  • the use of a multi-cylinder drum mixer enables a central space in the drum which is idle in a conventional single-cylinder drum to be effectively used for granulation of powder materials, thereby increasing the granulation efficiency of the drum mixer without increasing the diameter thereof.
  • the multi-cylinder drum mixer may be used in such a manner that the same powder materials are fed into each section of the drum defined by the plurality of cylinders. In such a case, there is the benefit over conventional single-cylinder drum mixers that the granulation efficiency of the powder materials and hence the productivity of sintered ores are improved.
  • a multi-cylinder drum has a front zone located on the inlet side and a rear zone located on the outlet side and the rear zone is comprised of a single cylinder, which corresponds to the outermost cylinder having the largest diameter among the plurality of cylinders. Thus, only the outermost cylinder extends for the entire length of the drum.
  • FIG. 2 An example of such an apparatus is schematically shown in Figure 2.
  • the apparatus is the same as that shown in Figures 1(a) and 1(b) except that a rear zone of the drum on the outlet side is comprised solely of the outer cylinder 2 rather than the double cylinders.
  • a front zone of the drum is comprised of the inner and outer cylinders 2, 9.
  • the front zone of the drum mainly serves to mix and granulate the two sets of powder materials separately in the individual sections and the resulting two sets of granulates are mixed in the rear zone of the drum.
  • the ratio of length of the inner cylinder to the outer cylinder i.e., the length of the front zone to the entire length of the drum is approximately 7 : 10.
  • a lower ratio may result in insufficient granulation within the inner cylinder, while a higher ratio may result in insufficient mixing of the two sets of granulates.
  • the double-cylinder structure may be replaced by a multi-cylinder structure having three or more cylinders.
  • Both the above-described drum mixers according to the present invention can be advantageously fabricated by relatively simple alterations of a conventional drum mixer.
  • the method and apparatus of the invention can be applied to mixing and granulation of any powder materials which require separate granulation two or more different sets of powder materials, although the powder materials fed to the individual sections in the drum may be the same.
  • the method and apparatus are particularly suitable for use in the preparation of granulated sintering mixes in the combined granulation processes.
  • the powder materials used in the preparation of sintering mixes for the production of sintered ores comprise a fine iron ore and at least one powdery additive selected from limestone, coke breeze, slaked lime, quicklime, and iron-containing dust.
  • the apparatus shown in Figures 1(a) and 1(b) is particularly suitable for use in the preparation of sintering mixes for the double-layer sintering method and other methods in which the separately granulated sintering mixes are not mixed before sintering. It is useful in the separated granulation method and similar methods as well.
  • the apparatus shown in Figure 2 is particularly suitable for use in the preparation of sintering mixes for the separated granulation method and other methods in which the separately granulated sintering mixes are mixed before sintering.
  • Formulation C was a conventional formulation for a sintering mix used in the production of sintered ores and it contained limestone powder, return fines, and coke breeze as additives to a fine iron ore.
  • Formulations A and B totally had the same formulation as Formulation C and each additive used in Formulation C was added to one of Formulations A and B so as to make a difference in the CaO content between these formulations.
  • Formulation A gave powder materials of a high CaO content
  • Formulation B gave powder materials of a low CaO content.
  • each drum mixer was set such that the angle of inclination of the common longitudinal axis of the cylinders was 5°, the rotational speed was 6 rpm, and the total feed rate of powder materials was 800 ton/hour. The granulation period was about 4 minutes.
  • the pot sintering tests were performed using 70 kg of a sintering mix for each test.
  • Runs Nos. 1 and 2 illustrate granulation of Formulation C.
  • a conventional Single-cylinder drum mixer was used in Run No. 1, while a double-cylinder drum mixer according to the present invention was used in Run No. 2 in which the powder materials were fed into the inner and outer sections of the drum at a weight ratio of inner to outer of 3 : 7.
  • the granulation efficiency was improved over that in Run No. 1 where a conventional single-cylinder drum mixer was used, thereby resulting in improvement in productivity in the pot sintering test.
  • Runs Nos. 3 to 6 illustrate granulation of two classes of powder materials having different CaO contents, i.e., the high-CaO Formulation A and low-CaO Formulation B.
  • the two classes of powder materials (Formulations A and B) were sequentially granulated in a conventional single-cylinder drum mixer and the resulting two classes of granulates were mixed manually for 1 minute and subjected to the pot sintering test.
  • Double-cylinder drum having a 7 m-long front zone on the inlet side and a 3 m-long rear zone on the outlet side in which the front zone is a double-cylinder drum consisting of an outer cylinder 5 m in diameter and an inner cylinder 3 m in diameter and the rear zone is a single-cylinder drum 5 m in diameter; the entire length of the drum is 10 m Fig. 2 TABLE 3 Run No.
  • Type 1 2 3 (Conventional) (Present Invention) (Conventional) Type of drum mixer used Type 1 Type 2 Type 1 Formulations used Single cylinder C (70 kg) A (21 kg) B (49 kg) Double cylinder Outer section C (49 kg) Inner section C (21 kg) Productivity of sintered ore (ton/day-m 2 ) 28.2 31.0 30.5 Reduction degradation index (RDI, %) 37.1 36.9 34.6 Run No.
  • the present invention it is possible to mix and granulate a plurality of sets of powder materials, such as those for sintering mixes used in the production of sintered ores, separately and simultaneously using a single drum mixer.
  • the resulting granulates can be mixed in the mixer when the mixer is of the type shown in Figure 2. Since the space factor of the drum mixer can be increased, the granulation efficiency can be improved without increasing the diameter of the drum.
  • the simultaneous and separate granulation of a plurality of powder materials can be readily achieved by using a multi-cylinder type of mixing and granulating apparatus of the present invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Glanulating (AREA)

Claims (7)

  1. Procédé de mélange et de granulation de matériaux en poudre utilisant un tambour à plusieurs cylindres comprenant une pluralité de cylindres concentriques reliés les uns aux autres, le tambour à plusieurs cylindres tournant autour de l'axe longitudinal commun des cylindres concentriques, cet axe étant incliné vers le bas par rapport à l'horizontale dans le sens du déplacement des matériaux, et recevant séparément une pluralité d'ensembles de matériaux en poudre dans une pluralité de sections définies par la pluralité de cylindres dans le tambour à plusieurs cylindres par une extrémité du tambour, caractérisé en ce que les divers ensembles de matériaux en poudre présentent des propriétés distinctes, la différence de propriétés entre les ensembles de matériaux en poudre résidant dans leur contenu en CaO, forçant ainsi les matériaux en poudre à se déplacer vers l'extrémité opposée du tambour tournant tandis qu'ils roulent dans celui-ci pour mélanger et granuler séparément les ensembles de matériaux en poudre dans les sections individuelles.
  2. Procédé selon la revendication 1, dans lequel le tambour à plusieurs cylindres est un tambour à double cylindre comportant un cylindre interne et un cylindre externe et dans lequel un ensemble de matériaux en poudre de contenu élevé en CaO est fourni à l'intérieur du cylindre interne et un autre ensemble de matériaux en poudre à faible contenu en CaO est fourni dans l'espace entre les cylindres interne et externe.
  3. Procédé selon la revendication 1 ou 2, dans lequel les matériaux en poudre sont des matériaux pour des mélanges de frittage utilisés pour la fabrication de minéraux frittés.
  4. Procédé selon la revendication 3, dans lequel les matériaux en poudre comprennent un minerai de fer fin et au moins un additif en poudre choisi parmi un poussier de coke, de la chaux vive et de la poussière contenant du fer.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'une buse à eau pour humidifier les matériaux en poudre fournis dans le tambour est prévue pour chaque section du tambour à plusieurs cylindres.
  6. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel tous les cylindres concentriques s'étendent sur toute la longueur du tambour.
  7. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel le tambour à plusieurs cylindres comprend une zone avant disposée du côté d'alimentation en matériau et une zone arrière disposée du côté de décharge des matériaux, et dans lequel la zone avant du tambour est constituée de la pluralité de cylindres concentriques et la zone arrière du tambour est constituée seulement des cylindres ayant le plus grand diamètre parmi la pluralité de cylindres.
EP19920116911 1991-10-02 1992-10-02 Procédé de mélange et de granulation d'une matière pulvérulente Expired - Lifetime EP0535699B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP255098/91 1991-10-02
JP25509891A JP2658671B2 (ja) 1991-10-02 1991-10-02 原料の混合造粒方法およびその装置

Publications (2)

Publication Number Publication Date
EP0535699A1 EP0535699A1 (fr) 1993-04-07
EP0535699B1 true EP0535699B1 (fr) 1997-01-22

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EP19920116911 Expired - Lifetime EP0535699B1 (fr) 1991-10-02 1992-10-02 Procédé de mélange et de granulation d'une matière pulvérulente

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EP (1) EP0535699B1 (fr)
JP (1) JP2658671B2 (fr)
DE (1) DE69216973T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109988905A (zh) * 2019-04-28 2019-07-09 中冶长天国际工程有限责任公司 一种用于造球机的物料调节方法及装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0992594A1 (fr) * 1998-10-08 2000-04-12 Sidmar N.V. Procédé de réduction des émissions de dioxines et de furanes par les installations d'agglomération de minerais de fer
CN111151194B (zh) * 2019-12-30 2022-04-12 中冶长天国际工程有限责任公司 一种复合型多通道高效制粒机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2052329A (en) * 1931-09-12 1936-08-25 American Lurgi Corp Process of and apparatus for granulating fine material by adhesion to moistened nuclear fragments
US2506618A (en) * 1945-01-31 1950-05-09 Nicolas A Sainderichin Apparatus for sintering ores
DE915072C (de) * 1952-03-27 1954-07-15 Polysius Gmbh Vorrichtung zum Granulieren von pulver- oder griessfoermigem Gut
DE1164308B (de) * 1962-11-28 1964-02-27 Georg Behringer Portland Zemen Verfahren und Vorrichtung zur Herstellung von Zementklinker
DE2843434C2 (de) * 1978-10-05 1982-08-19 Steag Ag, 4300 Essen Vorrichtung zum Herstellen von Steinkohlenpellets für einen Druckvergaser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109988905A (zh) * 2019-04-28 2019-07-09 中冶长天国际工程有限责任公司 一种用于造球机的物料调节方法及装置

Also Published As

Publication number Publication date
DE69216973D1 (de) 1997-03-06
JP2658671B2 (ja) 1997-09-30
DE69216973T2 (de) 1997-06-12
EP0535699A1 (fr) 1993-04-07
JPH0598360A (ja) 1993-04-20

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