WO2015154109A1 - Procédé et dispositif pour la granulation et le broyage de matériau en fusion - Google Patents

Procédé et dispositif pour la granulation et le broyage de matériau en fusion Download PDF

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Publication number
WO2015154109A1
WO2015154109A1 PCT/AT2015/000049 AT2015000049W WO2015154109A1 WO 2015154109 A1 WO2015154109 A1 WO 2015154109A1 AT 2015000049 W AT2015000049 W AT 2015000049W WO 2015154109 A1 WO2015154109 A1 WO 2015154109A1
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WO
WIPO (PCT)
Prior art keywords
mill
grinding media
grinding
water
material particles
Prior art date
Application number
PCT/AT2015/000049
Other languages
German (de)
English (en)
Inventor
Alfred Edlinger
Original Assignee
Alfred Edlinger
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 Edlinger filed Critical Alfred Edlinger
Publication of WO2015154109A1 publication Critical patent/WO2015154109A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
    • 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
    • B02C17/02—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 with perforated container
    • 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
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy
    • 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
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/30—Passing gas through crushing or disintegrating zone the applied gas acting to effect material separation
    • 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
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/36—Adding fluid, other than for crushing or disintegrating by fluid energy the crushing or disintegrating zone being submerged in liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/04—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot slag, hot residues, or heated blocks, e.g. iron blocks
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/052—Apparatus features including rotating parts
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/064—Thermally-conductive removable bodies, e.g. balls
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the invention relates to a method for granulating and comminuting molten material, such as e.g. Blast furnace slags, as well as an apparatus for carrying out this method.
  • molten material such as e.g. Blast furnace slags
  • Molten blast furnace slag is usually granulated with water with the aid of 10 to obtain an amorphous product
  • the energy initially contained is essentially used to store the originally contained energy in the form of the metastable glass phase of the final product and to prevent its transformation into a stable crystalline state.
  • WO 2012/034897 A2 a dry granulation process is described in which the slag is first filled in a molten state into a trough. In the slag bath then metal balls are filled, which solidify the slag. The solid slag-metal ball cake is finally broken into pieces, thereby recycling balls from the cake and further crushing and solidifying the pieces.
  • AT 407525 B describes a process in which molten slag is introduced into a pressure-resistant granulation chamber containing a water bath, wherein the slag granules which form are withdrawn together with wet steam and passed into a mill in which the granules are comminuted using a grinding media bed.
  • MahlSystem can be present as a fluidized bed or as a fixed bed.
  • Granulatable minerals are not only produced as blast furnace slag, but generally in metallurgy, in the alumina melting and portland clinker cement production,. in the production of synthetic slags (marl slag, RecoDust, Reco-Phos, RecoResh) and in the environmental technology.
  • Mineral melts for example blast furnace slags, must be cooled extremely rapidly (about 10 3 K / sec) below their recrystallization point (between about 600 and 850 ° C., depending on their basicity) in order to obtain a cement-containing amorphous product. Below this recrystallization temperature, the extent can be found with a much lower cooling gradient. Quench tests with water in the high temperature range have not led to any success, since the ratio water / melt flow is not technically feasible to reach a target temperature of 600 - 850 ° C.
  • the invention now aims to provide a method of the type mentioned above, with which it is possible to use the melting heat of slags thermodynamically much better and to reduce the specific grinding work. Furthermore, it should be possible in a simple manner to quench the feed below the recrystallization temperature.
  • the otherwise non-granulatable slags in particular slags with a high basicity (CaO / SiO 2 ratio) of> 1.5 and steelworks slags, should also be processable.
  • the invention according to a first aspect provides, in a method of the type initially mentioned, that the molten material is introduced into a grinding mill mill and quenched in contact with metallic grinding bodies of the grinding mill mill, and the stared material particles are ground by the action of grinding media.
  • the solidifying melt particles are comminuted by the grinding action of the grinding bodies, which likewise causes an enlargement of the surface available for heat transfer.
  • the simultaneous quenching and comminution by the grinding media also means that a substantial part of the comminution work already takes place in the molten state, so that the specific grinding work in the solid state reduces to about half compared to comminution.
  • the process according to the invention is particularly suitable for the granulation and comminution of blast furnace slags, marl slags or synthetic slags.
  • Mergel slag is understood to mean a melt which is obtained by Drying, preheating and calcining clayey marl or a mixture of marl and clay with a basicity of ⁇ 2.0 and then melting the product obtained in a separate melting furnace at higher temperatures than in the first stage of the process. Reference is made, for example, to WO 2001/046081 A2.
  • Synthetic slags are hereby understood to mean slags which are formed in the processing of metallurgical dusts or grinding dusts, in particular converter and electric arc dusts from steel or stainless steel production, or of sewage sludge.
  • slags which are formed in the processing of metallurgical dusts or grinding dusts, in particular converter and electric arc dusts from steel or stainless steel production, or of sewage sludge.
  • WO 2012/065798 A2 In connection with the processing of sewage sludge, reference is made to WO 2012/065798 A2.
  • the process according to the invention is also particularly suitable for the granulation and comminution of steelworks slags.
  • steelworks slag as well as the risk of explosion is avoided; it forms highly reactive, very fine-grained alite (C3S) and belite (C2S), the iron oxide and possibly chromium oxide-rich fraction can then be removed by magnetic separation.
  • C3S very fine-grained alite
  • C2S belite
  • the high, very disturbing magnesium oxide content of the steelworks slag combines with the iron oxide-rich fraction under spinel formation and is thus also deposited.
  • This iron oxide-rich fraction can advantageously be used in the blast furnace (sinter plant) as artificial ore, since there is practically no phosphorus.
  • a mixture of such processed blast furnace and steelworks slags is superior to the known composite and cement cements in terms of cement technology.
  • a preferred method provides that the molten material in contact with the grinding media is quenched to a temperature below the recrystallization temperature of the material.
  • the molten material is in contact with brought the Mahl Eisenn to a temperature of 600 - 850 ° C, in particular with a cooling rate of at least 10 3 K / sec.
  • a further preferred procedure provides that metal balls, in particular steel balls, whose diameter is preferably at least 15 mm, in particular at least 20 mm, are used as grinding bodies. In this way, the balls provide sufficient mass to ensure the required grinding performance.
  • all metal balls can be the same size.
  • an optimization of the grinding action can preferably be achieved by the metal balls having a predetermined size distribution. In this case, a size bandwidth is preferred in which the ball diameter is between 15 and 30 mm.
  • the method is preferably developed in such a way that the metal balls are set in motion to form a moving ball bed.
  • the formation of the moving ball bed can be done here in various ways.
  • the balls may be moved by the action of the flow of a gaseous medium, such as air or steam.
  • the movement of the metal balls can be produced by the balls being set in motion by moving drivers, for example by a stirrer, blades, guide plates or the like.
  • the grinding chamber of a rotating driven drum be formed on the wall, the balls rise and fall down due to gravity thereafter.
  • the invention preferably provides for the grinding media mill to be in the form of a ball mill, tumble mill, drum mill, tube mill, stirred ball mill or sieve drum mill.
  • media and media are moved in the ball mill. This results in collisions between the grinding bodies with each other and between grinding media and walls. The ground material is crushed when it is between the bodies. The comminution of the particles is thus done by impact, shear and impact stress.
  • the media mill may in this case be designed so that it has at least two adjoining each other in the axial direction grinding chambers, which are connected by a sieve with each other, and whose grinding media are sized so that in each grinding chamber to the previous grinding chamber higher Mahlfhard is achieved.
  • Mahlfö a Mühlekaska ⁇ de conceivable.
  • the grinding media In order that the grinding media can provide a constant cooling capacity even during continuous operation of the media mill, the media must be cooled continuously, preferably to a temperature below the recrystallization temperature of the molten material used. In particular, the grinding media are cooled to a temperature of 100-300 ° C.
  • the grinding media are cooled continuously in the interior of the grinding media mill.
  • the cooling of the grinding media is preferably carried out in this case by a endother ⁇ men process, such as by evaporating into the grinding Body mill incorporated water.
  • the cooling takes place here by the heat of vaporization at the surface of the grinding media.
  • the cooling power required for quenching the molten material is thus provided indirectly by evaporation heat.
  • the method according to the invention is comparable with other methods of the prior art, which also - for example by quenching in liquid water or by atomizing the melt with water or wet steam - use the heat of evaporation of water.
  • the grinding bodies are used as "intermediate carriers" which provide the required heat capacity and thermal conductivity, the required surface and the volume required to increase the heat transfer Heat of vaporization of the water cooled and take on the other hand, the corresponding amount of heat on the other hand in contact with the molten material for cooling the same again.
  • Another advantage of water vapor cooling is that the expanding water vapor supports the grinding work.
  • a first alternative envisages that the water in the grinding chamber of the grinding media mill is injected from above onto the grinding media. The water evaporates in contact with the grinding media and cools them in this way.
  • a second alternative is the provision of a water bath in the Grinding chamber into which at least a part of the grinding media dips.
  • the further alternative provides that water or steam is introduced via a plurality of openings in the grinding chamber of the grinding media mill, which are formed in an inner jacket bounding the grinding chamber.
  • the mill is in this case preferably double-walled, wherein an annular cavity is formed between the inner casing and an outer casing, which can be charged with water. This forms a water bath whose level is chosen so that a lower portion of the grinding media bed is arranged in a water bath. Due to the effect of heat, the water contained in the annular cavity is brought to evaporate and enters via the openings formed in the inner shell into the grinding chamber, where the required heat of evaporation removes heat from the grinding bodies and cools them.
  • the apertures can be designed to converge towards the grinding chamber in cross-section or to form nozzles, in particular slot dies extending over the axial length of the grinding chamber, which results in a pressure distribution and therefore in a uniformization of the water or steam inlet leads the grinding room.
  • a preferred side effect of the introduction of water or steam over the perforated inner jacket lies in the fact that the grinding bodies can be caused to vibrate thereby, which improves the grinding effect and reduces the occurrence of the Leidenfrost effect.
  • An effect of evaporative cooling is also that the resulting vapor serves as a driving medium for discharging the ground particles.
  • additional propellant in particular motive steam and / or compressed air, is introduced into the grinding chamber via the discharge opening of the media mill.
  • a second preferred method for cooling the grinding media it is provided that the grinding media is continuously discharged from the grinding media mill, cooled and then reintroduced into the grinding media mill.
  • the grinding media are cooled outside of the grinding media mill.
  • the media are preferably brought to a temperature of 20-140 ° C before being reintroduced into the media mill.
  • the heated media can be used to heat independent process gases or process fluids.
  • the heat transfer can take place in any heat exchangers.
  • the grinding media are introduced into a shaft-like device and cooled there by passing cold air.
  • the process according to the invention can work batchwise or continuously. Accordingly, the entry of the molten material and the discharge of the ground material particles take place at intervals or continuously. A continuous procedure is preferred. It is preferably provided that the ground material particles are discharged in powder or dust form with a temperature of 600-800 ° C from the MahlSystemmühle.
  • the discharge of the ground particles from the grinding chamber takes place in different ways, depending on the desired grinding fineness. If coarse material is to be discharged, this can be done by means of its own coarse material discharge at the bottom of the mill, as is the case with conventional ball mills using a diaphragm or sieve at the opening.
  • the ground particles can be discharged together with hot air or superheated steam, depending on whether the cooling of the grinding media in the grinding chamber takes place by means of heat of evaporation or in an external grinding medium cycle.
  • the method is preferably carried out in such a way that the milled material particles are discharged in a mixture with superheated steam and / or hot air and the material particles are separated off from superheated steam or hot air in a separator.
  • the discharge of the material particles / hot steam mixture takes place in the case of internal cooling of the grinding media by means of steam so that the grinding media remain in the mill.
  • the enthalpy of the superheated steam can be exer- tically used here.
  • an advantageous method procedure provides that the material particle / superheated steam mixture before the separator is e.g. is cooled in a heat exchanger to a temperature of 200-400 ° C.
  • the separated in the separator superheated steam can be fed to a condensation, the condensate of the grinding media mill can be fed in turn as a cooling medium.
  • the condenser can in this case be operated, for example, as a feedwater pre-heater. Any combustible gases (H 2 , H 2 S, CO, etc.) formed in the grinding chamber can also be used, either after steam condensation or by simultaneous combustion.
  • the inventive method is also advantageous in terms of halogen problem. Melting with fluoride and chloride contents is pyrolyzed by the steam and temperature regime, ie the halogens are converted into the corresponding acid anhydrites (HF, HCl) and thus removed from the corresponding slags: CaF 2 + H 2 0 - > CaO + 2 HF. The free lime formed reacts immediately with the acidic slag components (Si0 2 , Al2O3).
  • an apparatus for performing the method according to the invention comprising a filled with metallic grinding media grinding media mill with an entry port for molten material and a Austragso réelle for the ground solidified material particles.
  • the grinding body mill preferably has a housing formed by a drum which can be driven in rotation and is designed in particular as a ball mill, tumbling mill, drum mill, tube mill or sieve drum mill.
  • the grinding media are advantageously formed by metal balls, in particular steel balls, whose diameter is preferably at least 15 mm, in particular at least 20 mm.
  • the grinding media mill comprises a grinding chamber delimiting W
  • annular space is divided by axial dividing walls into a plurality of chambers which can be filled with water.
  • a favorable initial division of the molten material results when the molten material feed opening is located radially outward of the axis of rotation of the media mill and the direction of rotation of the media mill is selected to move the media disposed in the bottom area of the mill toward the entry port.
  • the molten material is introduced into the area of the mill, in which the grinding media are pulled upwards on the drum wall, so that it is equally divided during the subsequent falling down of the grinding media.
  • a spraying device directed towards the grinding media for water which is connected to a water feed, is arranged in the interior of the grinding media mill.
  • an external cooling device for the grinding media can be connected to the discharge opening of the mill.
  • the discharge opening is arranged coaxially to the axis of rotation of the grinding media mill, which brings constructive advantages.
  • the discharge opening is connected to a separator for separating the ground material particles from hot air and / or superheated steam.
  • the separator may be preceded by a heat exchanger in order to remove the material particles / superheated steam. Cool material particles / hot air mixture. As a result, the hot steam can be used energetically.
  • a further thermal utilization is made possible by the fact that the hot steam discharge of the separator is connected to a condenser whose condensate discharge feeds the water inlet for the spraying device or the water feed annular chamber. At the same time thereby a circulation of the water is made possible.
  • FIG. 2 shows a longitudinal section of the device according to FIG. 1
  • FIG. 3 shows an enlarged detail of the device according to FIGS. 1 and 2
  • FIG. 4 shows a circuit diagram of a granulating device according to FIG Fig. 1 and 2 integrating system
  • Fig. 5 shows an alternative embodiment of the system.
  • a ball mill 1 is shown in cross section, the cylindrical drum 2 is rotatably mounted about the rotation axis 3. In operation, the drum 2 is turned into rotation Direction of the arrow 4 driven.
  • the drum 2 has an outer casing 5 and an inner shell 7 delimiting the grinding chamber 6. Between the outer shell 5 and the inner shell 7, an annular cavity 8 is formed, which is connected via a plurality of regularly distributed over the circumference of the grinding chamber 6, preferably slot-shaped openings 9 with the grinding chamber 6.
  • the slag entry 10 Coaxially to the axis of rotation 3 opens a slag entry 10 into the grinding chamber 6, wherein the slag entry has a centrally disposed inside the grinding chamber 6 slag tundish 11, the slot-shaped entry opening 12 extends in the axial direction of the drum 2 and is disposed eccentrically within the grinding chamber 6 ,
  • the drum 2 has, on the side opposite the slag entry 10, a discharge opening 13 which is coaxial with the axis of rotation 3 and to which a discharge line 14 is connected (FIG. 2).
  • spray openings are directed downwards.
  • a metal ball bed 16 is provided, the metal, in particular steel balls, the grinding body of the ball mill 1 form.
  • the metal balls are in the operation of the ball mill 1 by the rotating in the direction of arrow 4 drum 2 as shown in Fig. 1 taken upwards (arrow 17) and fall after reaching a critical height due to gravity back down (arrow 18) ,
  • the ball mill 1 as indicated at 19, water passed into a arranged in the drum 2 water inlet annular chamber 20 which is separated by a diaphragm 21 from the grinding chamber 6.
  • the diaphragm 21 is liquid-permeable only in the area of the water inlet ring chamber 20, so that the water inlet ring chamber 20 feeds a water bath 22 formed in the grinding chamber 6, which always lies in the bottom area of the drum
  • the water of the water bath 22 fills the annular cavity 8 between the outer shell 5 and the inner shell 7 of the drum 2.
  • the annular cavity 8 has a plurality of dividing walls 23 extending in the axial direction of the drum 2, so that a large number of chambers 24 adjoining one another in the circumferential direction are formed in the annular cavity 8.
  • Each chamber 24 is in this case connected via a slot-shaped opening 9 with the grinding chamber 6, wherein the slot-shaped openings 9 to the grinding chamber 6 toward converging walls 25 have, so that there is a nozzle effect.
  • blast furnace slag 26 at a temperature of 1300-1600 ° C. is introduced into the grinding chamber 6 via the slag tundish 11, the blast furnace slag 26 reaching the ball bed 16, which has a temperature of at most 400-600 ° C. , The slag is abruptly cooled on the surface of the metal balls of the ball bed 16. At the same time, due to the movement of the balls, the slag is divided into solidifying particles. The solidifying particles are further comminuted by the grinding effect of the ball bed 16 until they have a minimum upper grain boundary of, for example, 60 pm in order to be able to be discharged from the ball mill 1.
  • the particles are cooled in the ball mill 1 so far that they at discharge a temperature of 600 - 800 ° C or lower.
  • the ball mill 1 can in this case be designed such that it has at least two mutually adjoining grinding chambers in the axial direction, which communicate with one another by a screening device, and whose grinding bodies are dimensioned such that a grinding fineness higher in each grinding chamber is achieved compared to the preceding grinding chamber becomes.
  • a mill cascade is conceivable. The longer the residence time of the particles in the mill, the deeper the ground particles are cooled, so that the exergetic utilization can be further improved.
  • FIG. 4 shows a plant scheme for the further treatment of the ground slag particles.
  • the ball mill is again denoted by 1.
  • the discharged from the ball mill 1 hot steam / dust mixture is supplied at a temperature of about 600- 800 ° C a heat exchanger 27, which may be formed, for example, as a steam generator.
  • the superheated steam / dust mixture is cooled, for example, to a temperature of 150-250 ° C., whereby no condensation of the superheated steam takes place.
  • the cooled hot steam / dust mixture is fed to a separator 28, in which the slag powder 29 is separated from the steam 31.
  • the slag powder 29 can be dried in the sequence with dry air 30, wherein the air also serves to further promote the slag powder.
  • the steam 31 is supplied to a condenser 32, which may serve, for example, as a feedwater pre-heater.
  • the condensate leaving the condenser 32 can be collected in a condensate tank 33 and, if necessary, fed to the ball mill 1 via 19. If a lower pressure is set at the point 34 than at the point 35, the resulting pressure difference is used to promote the superheated steam / dust mixture, so that can be dispensed with ventilation devices. While in the embodiment according to FIG.
  • the balls serving as grinding bodies in the ball mill 4 are cooled internally, ie in the grinding chamber 6, in the embodiment according to FIG. 5 an external ball cycle is provided.
  • the balls are discharged together with the hot air / slag particle mixture via the discharge opening 13 from the grinding chamber 6 of the ball mill 1. Due to gravity, the balls fall together with most of the ground material into a shaft ball cooler 36, which is charged with cold air 37 for cooling the balls. At Place of cold air can be injected for the cooling water and water, the heat of vaporization is used.
  • the balls sink down inside the shaft ball cooler 36 and are discharged via the lock 38 into a separating device 39.
  • the balls are separated from slag powder, wherein the separating device 39 may be formed, for example, as a sieve, air classifier or the like.
  • the separated slag particles are discharged at 40 and the liberated from slag particles and cooled to a temperature of about 20-140 ° C balls at 41.
  • the cooled balls are the ball mill on the entry port 10 abandoned.
  • the balls and the molten slag are placed on the same side of the ball mill 1 and pass through the ball mill 1 in the same flow.
  • the mixture of hot air and the finer fraction of the slag particles emerging from the grinding chamber 6 of the ball mill 1 via the discharge opening 13 reaches the region of the shaft 36 above the discharge opening.
  • the mixture can above the discharge opening lying region of the shaft have a cross-sectional widening, so that the flow velocity is reduced.
  • the hot air / slag dust mixture is fed to a hot dust separator 42, from which dedusted hot air (600-800 ° C) at 43 and hot slag powder at 44 (600-800 ° C) is removed.
  • the hot air 43 can be supplied to a further energy recovery.
  • the hot slag powder can, as indicated at 45, be fed to the shaft ball cooler 36.
  • a hot gas screw conveyor can be used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crushing And Grinding (AREA)

Abstract

Procédé et dispositif pour la granulation et le broyage de matériau en fusion, tel que par ex., du laitier de haut-fourneau (26), le matériau en fusion étant introduit dans un broyeur (1) à corps broyants et refroidi brusquement au contact avec les corps broyants métalliques du broyeur (1) à corps broyants, les particules solidifiées de matériau étant broyées par les corps broyants.
PCT/AT2015/000049 2014-04-08 2015-03-31 Procédé et dispositif pour la granulation et le broyage de matériau en fusion WO2015154109A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA266/2014 2014-04-08
ATA266/2014A AT515588A1 (de) 2014-04-08 2014-04-08 Verfahren zum Granulieren und Zerkleinern von schmelzflüssigem Material

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WO2015154109A1 true WO2015154109A1 (fr) 2015-10-15

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WO (1) WO2015154109A1 (fr)

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CN108315513A (zh) * 2017-01-16 2018-07-24 宝山钢铁股份有限公司 高炉水渣处理系统以及高炉水渣处理方法
CN108330235A (zh) * 2018-02-26 2018-07-27 西安交通大学 一种液态熔渣粒化及余热回收装置
CN108531670A (zh) * 2018-07-04 2018-09-14 上海宝钢节能环保技术有限公司 一种滚筒法渣处理多点喷淋装置
CN112958246A (zh) * 2021-04-02 2021-06-15 中冶节能环保有限责任公司 一种高温钢渣圆盘破碎余热回收装置及方法
CN113699287A (zh) * 2021-09-02 2021-11-26 南京华电节能环保股份有限公司 一种基于高温渣余热回收的高炉熔渣干法处理装置

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CN108315513A (zh) * 2017-01-16 2018-07-24 宝山钢铁股份有限公司 高炉水渣处理系统以及高炉水渣处理方法
CN108315513B (zh) * 2017-01-16 2020-03-27 宝山钢铁股份有限公司 高炉水渣处理系统以及高炉水渣处理方法
CN108330235A (zh) * 2018-02-26 2018-07-27 西安交通大学 一种液态熔渣粒化及余热回收装置
CN108330235B (zh) * 2018-02-26 2019-12-24 西安交通大学 一种液态熔渣粒化及余热回收装置
CN108531670A (zh) * 2018-07-04 2018-09-14 上海宝钢节能环保技术有限公司 一种滚筒法渣处理多点喷淋装置
CN112958246A (zh) * 2021-04-02 2021-06-15 中冶节能环保有限责任公司 一种高温钢渣圆盘破碎余热回收装置及方法
CN112958246B (zh) * 2021-04-02 2024-01-09 中冶节能环保有限责任公司 一种高温钢渣圆盘破碎余热回收装置及方法
CN113699287A (zh) * 2021-09-02 2021-11-26 南京华电节能环保股份有限公司 一种基于高温渣余热回收的高炉熔渣干法处理装置

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