[go: up one dir, main page]

WO2011067400A1 - Installation et procédé de traitement de matière en fusion produite par une usine métallurgique, en particulier pour le traitement de laitier de haut-fourneau - Google Patents

Installation et procédé de traitement de matière en fusion produite par une usine métallurgique, en particulier pour le traitement de laitier de haut-fourneau Download PDF

Info

Publication number
WO2011067400A1
WO2011067400A1 PCT/EP2010/068898 EP2010068898W WO2011067400A1 WO 2011067400 A1 WO2011067400 A1 WO 2011067400A1 EP 2010068898 W EP2010068898 W EP 2010068898W WO 2011067400 A1 WO2011067400 A1 WO 2011067400A1
Authority
WO
WIPO (PCT)
Prior art keywords
slurry
dewatering
unit
dewatering unit
overflow
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.)
Ceased
Application number
PCT/EP2010/068898
Other languages
English (en)
Inventor
Thomas Sgarbi
Marc Schweitzer
Bob Greiveldinger
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.)
Paul Wurth SA
Original Assignee
Paul Wurth 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 Paul Wurth SA filed Critical Paul Wurth SA
Priority to CN2010900009389U priority Critical patent/CN202626211U/zh
Publication of WO2011067400A1 publication Critical patent/WO2011067400A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B5/00—Treatment of  metallurgical  slag ; Artificial stone from molten  metallurgical  slag 
    • 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
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/032—Separating slag from liquid, e.g. from water, after quenching
    • 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
    • C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag
    • 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
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/072—Tanks to collect the slag, e.g. water tank

Definitions

  • the present invention generally relates to the field of processing molten material in metallurgical plants, and more specifically to granulation of molten slag such as blast furnace slag.
  • These systems typically comprise a granulation unit for granulating a stream of slag received from the skimmer by quenching the stream with water jets.
  • the granulation unit usually comprises a runner tip from which the molten stream is poured into high-pressure water jets produced by one or more spray heads (usually called "blowing box").
  • the resulting slurry drops into a basin from where slurry is taken for dewatering.
  • the granulation unit normally also comprises a condensation tower above the basin for condensation of produced water vapor.
  • the slurry of granulated material and water produced by the granulation unit is fed to the inlet of a dynamic dewatering unit via a supply conduit, e.g. via a runner or a pipe conduit.
  • the dewatering unit includes a rotary dewatering drum having a drum shell designed to have a sieving filter function and internal buckets for lifting the granulated slag upwards from where it drops onto a belt conveyor.
  • the dewatering drum is configured to separate slurry into a granulated material fraction (phase) to be fed by the belt conveyor to a slurry outlet and into a water fraction (phase), discharged at the bottom of the sieving drum, to be fed to a water outlet for recovery as process water.
  • a design, in which the dewatering drum is arranged inside the granulation unit, i.e. in which granulation and dewatering are performed in a single unitary structure, is known from US patent no. 4,909,821 .
  • Alternative dynamic dewatering units, which instead of a rotary drum suggest other kinds of mobile dewatering components are known e.g. from international patent applications WO 2006/108517, WO 2005/031008 or from Japanese patent application JP 01 079044, which suggest using a dewatering screw conveyor, or from German patent application DE 4 214 948, which proposes a dewatering scoop wheel with external dewatering scoops.
  • a dewatering bucket elevator as a further alternative, is known from US patent no. 3,615,329.
  • dynamic dewatering units still leave room for further improvement.
  • a particular limitation of such dynamic dewatering units is their inherent processing capacity, i.e. the maximum incoming volume flow rate of slurry at which reliable separation is still warranted.
  • the dewatering capacity is usually determined by the maximum operating speed (e.g. rotational speed of the drum / wheel / conveyor) and the dimensions of the mobile component, both setting an upper limit to capacity of reliable treatment.
  • US patent no. 6'610'243 proposes an installation for processing molten material with a granulation unit for aqueous quenching of blast furnace slag, with a dewatering drum as a first dynamic dewatering unit and with a hydrocyclone as a second dynamic dewatering unit.
  • US 6'610'243 suggests installing a distributor/separator downstream of the granulation tank and upstream of the dewatering units.
  • This distributor has various hopper shaped concentration tanks, in which granules settle according to their specific weight.
  • This distributor/separator is designed for separately feeding a slurry with coarser granules to the dewatering drum and separately feeding slurry with finer particles to the hydrocyclone. When used as a retrofit, this approach might allow increasing capacity. However, reliable operation of the specifically designed distributor/separator is difficult achieve among others because the slurry production is far from being constant. It may show peak values of more than four times the average rate during a cycle. Moreover, a suitable separator according to US 6'610'243 also requires considerable floor space.
  • the invention relates to an installation for processing molten material that is produced by a metallurgical plant, in particular for processing blast furnace slag.
  • the installation comprises one or more granulation units for granulating a stream of molten material by quenching the stream with water, in particular with comparatively cold high- pressure water jets to produce a slurry of granulated material and water.
  • It further has a main dynamic dewatering unit with a slurry inlet connected to the granulation unit(s) via a supply conduit, e.g. via an open runner or closed pipeline, for receiving slurry produced by the granulation unit(s).
  • This unit has a material outlet from which granulated material can be recovered and a water outlet from which process water can be recovered, in particular for recycling the process water to the granulation unit(s).
  • the main dynamic dewatering unit comprises a mobile component, preferably but not necessarily a rotary dewatering drum (e.g. as in an INBA® installation), that allows separating received slurry into a granulated material fraction that is fed, directly or indirectly, to the slurry outlet and into a water fraction that is fed, directly or indirectly, to the water outlet.
  • the installation comprises: a slurry overflow configured for draining excess slurry in excess of the dewatering capacity of the main dynamic dewatering unit before slurry cannot enter "clean water" portions of the installation.
  • the slurry overflow is arranged either upstream the slurry inlet, e.g. in the supply conduit or, alternatively, at (e.g. underneath) the slurry inlet, i.e. adjacent the slurry inlet.
  • a secondary dewatering unit that is also configured for separating slurry into a secondary dewatered fraction and a secondary water fraction.
  • the secondary dewatering unit has an inlet connected for receiving excess slurry drained via the slurry overflow, a first outlet connected for feeding the secondary dewatered fraction back to the main dynamic dewatering unit, in particular onto or into its mobile component, and a second outlet connected to allow independent recovery of the secondary water fraction.
  • the installation is configured to drain excess slurry upstream of the water outlet of the main dynamic dewatering unit and to separate drained excess slurry into a secondary dewatered fraction that returns to the main dynamic dewatering unit and into a secondary water fraction that is recovered without passing through the main dynamic dewatering unit.
  • the proposed arrangement especially of the overflow and connections to secondary dewatering - precludes slurry from "contaminating" the "clean water” portions of the installation. This is an incontestable benefit of the proposed configuration, when compared to the theoretical possibility of operating an existing installation with an excess of slurry over a certain time.
  • the installation thereby enables continuous processing a flow of slurry that exceeds the dewatering capacity of the main dynamic dewatering unit.
  • auxiliary (secondary) dewatering unit of comparatively lower dewatering capacity
  • auxiliary dewatering unit of comparatively lower dewatering capacity
  • the proposed overflow arrangement enables considerable increases of the combined dewatering capacity.
  • only the minor secondary dewatered fraction is returned to the main dynamic dewatering unit whereas the major water fraction is directly available for further use without passing through the main dewatering unit.
  • the prior necessity for either large buffering capacities, e.g. according to Luxembourg patent no 86 943, or for replacement by a more expensive larger capacity main dewatering unit is overcome.
  • the secondary dewatering unit is also preferably of the dynamic type, i.e. - as opposed to gravity-induced static dewatering tanks or settling basins - a device that dewaters by virtue of either motion of a driven dewatering component (e.g. a dewatering drum) or by motion of the slurry itself (e.g. in a hydrocyclone).
  • a driven dewatering component e.g. a dewatering drum
  • motion of the slurry itself e.g. in a hydrocyclone
  • the proposed installation, especially the proposed slurry overflow and secondary dewatering unit enable for cost-efficient upgrades (retrofitting) of existing installations that increase the overall dewatering capacity without major and costly constructional changes of the existing main components.
  • the invention enables new installations to reliably process higher slurry input flow rates exceeding the nominal capacity of the main dewatering unit as such, i.e. the use of main dewatering units having reduced capacity compared to the prior art.
  • the invention also relates to a method for processing molten material produced by a metallurgical plant, in particular for processing blast furnace slag.
  • the proposed method comprises: granulating a stream of molten material by quenching the stream to produce a slurry of granulated material and water;
  • a main dynamic dewatering unit that comprises a mobile component, in particular a rotary dewatering drum,
  • the method comprises:
  • the proposed installation and method are particularly suitable for industrial application in the field of wet granulation of molten products and byproducts in metallurgical industry both ferrous, e.g. pig iron slag, and non-ferrous, e.g. copper matte.
  • FIG.1 is a schematic layout and flow diagram of a first embodiment illustrating a main dynamic dewatering unit of the dewatering-drum type equipped with a secondary dynamic dewatering unit and with a first variant of a slurry overflow;
  • FIG.2 is a schematic layout and flow diagram of the main dynamic dewatering unit of FIG.1 showing the rotatable dewatering drum in perspective view and illustrating recovery of granulated material from an outlet of the secondary dewatering unit into the dewatering drum;
  • FIG.3 is a schematic vertical cross-section through the main dynamic dewatering unit of FIG.1 illustrating a level sensor used as overflow detection device;
  • FIG.4 is a schematic perspective view of an exemplary collecting tank for use in the main dynamic dewatering unit of FIGS.1 -3;
  • FIG.5A&5B are schematic layout and flow diagrams of a second embodiment equipped with a second variant of a slurry overflow, FIG.5A illustrating a normal mode of operation and FIG.5B illustrating a higher-capacity mode of operation ("continuous overflow mode");
  • FIG.6 is a schematic layout and flow diagram of a third embodiment, in which a main dynamic dewatering unit of the scoop-wheel type is equipped with a secondary dynamic dewatering unit and with a third variant of a slurry overflow;
  • FIG. is a schematic layout and flow diagram of a fourth embodiment, in which a main dynamic dewatering unit of the dewatering-screw type is equipped with a secondary dynamic dewatering unit and with a slurry overflow as in FIG.6.
  • an installation for processing molten material is generally identified by reference numeral 100.
  • the installation 100 according to the first embodiment is designed to process pig iron slag into vitrified granulated slag ("slag sand").
  • Unprocessed pig iron slag is a low value by-product of pig iron produced in a blast furnace (not shown).
  • Slag sand is a higher-value product suitable for further exploitation, e.g. in the cement industry.
  • the installation 100 is intended to be an integral part of a larger-scale metallurgical plant.
  • the installation 100 comprises two granulation units 1 10, 120 configured to quench a stream of molten slag with water, and more specifically, to inject a high-pressure jet of comparatively cold water, e.g. at ⁇ 100°C, into a falling stream of liquid hot slag, e.g. >1200°C.
  • each granulation unit 1 10, 120 has a respective runner tip 1 12, 122 with an associated spray head 1 14, 124 (also called “blowing box”) arranged below the runner tip 1 12, 122.
  • Each spray head 1 14, 124 can provide a high-pressure water jet that impacts slag falling from the associated runner tip 1 12, 122 so as to achieve granulation.
  • a suitable spray head is disclosed e.g.
  • Molten slag is typically fed to the granulation units 1 10, 120 in intermittent manner, i.e. in more or less regular intervals at which the blast furnace (not shown) is tapped, via a respective slag runner (not shown) that originates at the skimmer (not shown).
  • the runner tips 1 12, 122 are the downstream ends of the slag runners.
  • Each granulation unit 1 10, 120 has a water- filled basin 1 16, 126 below its spray head 1 14, 124 for collecting the slurry (also called "pulp") resulting from water quenching of the molten slag and a hood for collecting fume and vapor emissions.
  • the general configuration of a suitable granulation unit 1 10, 120 is well known.
  • each granulation unit 1 10, 120 preferably comprises an auxiliary spray head 1 18, 128, which can be operated optionally in addition to the main spray head 1 14, 124.
  • the auxiliary spray heads 1 18, 128 allow for granulating slag at higher input flow rates (above normal).
  • the installation 100 includes a main dynamic dewatering unit 130 equipped with a mobile dewatering component, more specifically with a cylindrical rotary dewatering drum 132 that is motor-driven and has a colander-like filtering function for dewatering slurry.
  • a suitable general configuration of the dewatering unit 130 is well known from existing INBA® installations and described e.g. in US 4,204,855. Only features relevant to the present invention are thus discussed hereinafter.
  • Main advantages of a dynamic dewatering unit 130, especially of the type with a rotary drum 132 lie in that it enables continuous dewatering, compact construction, high availability as well as low maintenance and operating costs.
  • the main dynamic dewatering unit 130 is connected downstream the granulation units 1 10, 120 for further treatment of slurry.
  • the main dynamic dewatering unit 130 continuously separates the solid fraction of granulated material, i.e. coarse and fine slag sand, from the liquid fraction, i.e. process water, to facilitate separate recovery of each fraction.
  • the preferred main dynamic dewatering unit 130 equipped with a dewatering drum 132 allows recovering granulated slag with comparatively low water content, e.g. ⁇ 15% by volume, from slurry ("pulp") that has a much higher water proportion, e.g. >85% by volume.
  • the main dynamic dewatering unit 130 has a slurry inlet, generally identified by reference numeral 134.
  • a slurry inlet In the embodiment of FIG.1 , the upstream open front face of the rotary dewatering drum 132 forms the slurry inlet 134.
  • the slurry inlet 134 is independently connected to each granulation unit 1 10, 120 by means of a respective supply conduit, e.g. a sloping gravity-feed open runner or a closed pipeline 136, 138 equipped with a respective pump as shown in FIG.1.
  • the main dynamic dewatering unit 130 further has a material outlet 140 from which dewatered granulated material from the rotary dewatering drum 132 is recovered.
  • the material outlet 140 is formed by a delivery end, which is usually arranged above a stockyard, of a belt conveyor - a typical part of the main dynamic dewatering unit 130 - that has a receiving end inside the dewatering drum 132.
  • the main dynamic dewatering unit 130 has a water outlet 142 from which filtered process water that has a low or very low content of suspended fine (granulated) material particles can be recovered.
  • the water outlet 142 emanates from a collecting tank 144 (so called "hot water tank” - another typical part of an INBA® type main dynamic dewatering unit 130). More specifically, the water outlet 142 emerges from a clean water compartment 145 of or at the collecting tank 144.
  • the clean water compartment 145 is connected, e.g. by means of a spillover weir, downstream a main settling compartment 146 of the collecting tank 144 (see below). As best seen in FIG.2, the main settling compartment 146 is arranged vertically underneath the rotary drum 132.
  • a process-water-recycling circuit 148 is connected to the water outlet 142 and equipped with pumps and a cooling tower 149.
  • the water-recycling circuit 148 recirculates comparatively hot water recovered at the water outlet 142, after cooling to a suitable quenching temperature in the cooling tower 149, as needed to the spray heads 1 14, 1 18; 124, 128 of either or both granulation units 1 10, 120.
  • the installation 100 has a slurry overflow with a first collecting gutter 150 that is arranged at the slurry inlet 134.
  • the first collecting gutter 150 is arranged immediately at and underneath the open upstream front face of the dewatering drum 132.
  • the slurry overflow may have a second collecting gutter 152 that is similarly arranged at the open downstream front face of the dewatering drum 132.
  • the collecting gutters 150, 152 form a slurry overflow that enables draining any excess slurry, i.e. any proportion of the slurry received via the supply conduits 136, 138 that exceeds the dewatering capacity of the rotary dewatering drum 132 (i.e.
  • the slurry overflow may comprise respective upwardly open collecting troughs or gutters 150, 152 arranged below and along the width of the corresponding front face of the dewatering drum 132 so as to receive any spillover of slurry.
  • each gutter 150, 152 is connected to a drain conduit 154 that leads drained slurry into a separate dedicated slurry compartment or, preferably, into an integrated slurry compartment 147 that is arranged within the volume of the collecting tank 144 but separated from the main settling compartment 146 and from the clean water compartment 145, e.g. as will be detailed below in relation to FIG.4.
  • the installation 100 further includes an auxiliary secondary dynamic dewatering unit 160 configured for separating slurry into a secondary dewatered fraction (sludge) and a secondary water fraction.
  • the preferred dynamic secondary dynamic dewatering unit 160 includes a hydrocyclone (or a set of parallel hydrocyclones), which is of per se known configuration and connected in forward mode. In principle, any motion-induced continuously filtering (dynamic) dewatering device may be employed. Dynamic dewatering devices that have the benefit of comparatively high throughput (flow rate), even if not achieving optimal dehydration, i.e. very low moisture content in the dewatered fraction (dense fraction), are preferred.
  • the secondary dynamic dewatering unit 160 may comprise other dewatering devices e.g. one or more motor-driven true centrifuges of suitable type, e.g. a tubular bowl centrifuge, a chamber bowl centrifuge, an imperforate basket centrifuge, a disk stack separator or a decanter centrifuge (not illustrated).
  • dewatering devices e.g. one or more motor-driven true centrifuges of suitable type, e.g. a tubular bowl centrifuge, a chamber bowl centrifuge, an imperforate basket centrifuge, a disk stack separator or a decanter centrifuge (not illustrated).
  • the secondary dynamic dewatering unit 160 has an inlet 162 that is connected for receiving slurry from the collecting tank 144, especially excess slurry drained via the slurry overflow 150, 152 into the slurry compartment 147.
  • the secondary dynamic dewatering unit 160 has a first outlet 164, e.g. the reject side of the hydrocyclone(s), that is connected with conduits for returning the secondary dewatered fraction (dense fraction / sludge) to the main dynamic dewatering unit 130, and a second outlet 166, e.g. the accept side of the hydrocyclone(s), that is connected with conduits for recovering the filtered secondary water fraction (light/fluid fraction).
  • the secondary dewatered fraction i.e. the sludge obtained at the first outlet 164, not necessarily but normally requires post-treatment in the main dewatering unit 130 to reach satisfying moisture content of the ultimately recovered granulated material.
  • a recirculation conduit 172 e.g. an abrasion resistant piping, is connected to the inlet 162 to feed slurry from a bottom portion of the collecting tank 144, in particular excess slurry that has been drained via the slurry overflow 150, 152, to the secondary dynamic dewatering unit 160.
  • the first outlet 164 in turn is connected to a first return conduit 174, e.g. an abrasion resistant piping, that feeds the dense secondary dewatered fraction, i.e. sludge with a considerably lower water content than the input slurry, from the secondary dynamic dewatering unit 160 back to the main dynamic dewatering unit 130.
  • the first return conduit 174 preferably leads onto an inside surface of the dewatering drum 132.
  • the return conduit 174 discharges onto the side at which concave blade-like filtering members, i.e. buckets 173 inside the dewatering drum 132 rotate upwards. Accordingly, the secondary dewatered fraction is fed onto a layer of granulated material on the filtering buckets 173 for additional dewatering and for discharge via the belt conveyor to the material outlet 140.
  • the first return conduit 174 may also lead into either of the supply conduits 136, 138 or the basins 1 16, 126.
  • a bypass conduit 175 is provided to connect the recirculation conduit 172 directly to the first return conduit 174 without passing through the secondary dynamic dewatering unit 160, e.g. in the absence of excess slurry or for maintenance purposes.
  • Suitable valves (not shown) in the bypass conduit 175 and the recirculation conduit 172 direct the flow as required through or in bypass of the secondary dynamic dewatering unit 160.
  • the second outlet 166 in turn is connected via a second return conduit 176, e.g.
  • a piping to feed the secondary water fraction (light/fluid fraction), in a manner avoiding the solid-laden components of the main dynamic dewatering unit 130, into a reservoir with filtered "clean" process water, preferably directly upstream of the water outlet 142, e.g. into the clean water compartment 145 of the collecting tank 144.
  • the recirculation conduit 172 is equipped with a first pump 177 dimensioned for normal load and a second pump 178 dimensioned for excess load.
  • the pumps 177, 178 are connected in parallel for alternating operation and have their respective intake connected to the bottom of the collecting tank 144 at the side of the slurry compartment 147. Alternating operation of the pumps 177, 178 by suitable process control is based on the operating condition determined by an overflow detection device as described below in relation to FIG.3, for delivering slurry either to the secondary dynamic dewatering unit 160 or through the bypass conduit 175 as required.
  • the installation 100 is capable of draining any excess of slurry received by the main dynamic dewatering unit 130 upstream of the water outlet 142 and upstream of its clean water carrying components (such as the clean water compartment 145) to thereby avoid contamination of recovered "clean" process water.
  • the installation 100 can continuously separate drained excess slurry into a dense fraction that returns to the main dynamic dewatering unit 130 and into a water that is recovered without passing through the main dynamic dewatering unit 130 and its solids-laden components (such as the main settling compartment 146).
  • the installation 100 enables operation in two modes, namely a normal mode of operation at which the input flow rate of slurry fed to the main dynamic dewatering unit 130 does not exceed its maximum dewatering capacity and, - as will be noted - a novel "continuous overflow" mode of operation, in which slurry at an input flow rate that exceeds the maximum dewatering capacity is fed to the main dynamic dewatering unit 130 over a comparatively long period (i.e. quasi-continuously).
  • bypass 175 open; inlet 162: closed;
  • bypass 175 closed; inlet 162: open;
  • recirculation flow rate via recirculation conduit 172 700m 3 /h;
  • the proposed installation allows operation at flow rates that considerably exceed (e.g. >125%) the nominal maximum capacity for which the main dynamic dewatering unit 130 is designed, the actual increase in total capacity being dependent mainly on the capacity of the secondary dynamic dewatering unit 160.
  • an exemplary overflow detection device 180 is illustrated for detecting whether the flow rate of slurry received via the slurry inlet 134 (see arrows 181 in FIG.3) exceeds the dewatering capacity of the main dynamic dewatering unit 130, i.e. whether "excess slurry" is fed.
  • a preferred overflow detection device 180 is e.g. a level transmitter, as seen in FIG.3, which is connected to a signal line 182 of the plant process control system and arranged inside the lowermost portion of the dewatering drum 132.
  • the overflow detection device 180 of FIG.3 determines whether the level of slurry inside the drum 132 remains within upper and lower limits 183, 184.
  • overflow detection devices including a radar probe measuring the slurry level inside the dewatering drum 132 or inside the supply conduit(s) 136, 138, or including an unbalance-sensor for measuring the imbalance (unbalanced mass), or a torque-meter for measuring the moment of inertia, of the slurry- containing drum 132.
  • the choice of overflow detection device 180 depends mainly on the type of the main dynamic dewatering unit 130. Irrespectively of its configuration the overflow detection device 180 provides data, e.g.
  • FIG.4 illustrates an exemplary configuration of a collecting tank 144 for collecting filtered water dripping from the rotary dewatering drum 132.
  • the collecting tank 144 has an upper portion 190, which is arranged underneath the rotary dewatering drum 132 and is adapted to the dimensions of the drum 132, i.e. has an upper surface sufficiently large to collect all water that drips down through the barrel of the dewatering drum 132.
  • the collecting tank 144 further has a generally downwardly tapering, e.g. conical, lower portion 192, in which solid slag particles can settle to densely accumulate at the bottom tip.
  • the collecting tank 144 of FIG.4 has an internal partition 194, e.g.
  • the partition 194 divides the internal volume of the collecting tank 144 into the main settling compartment 146 and into the slurry compartment 147 arranged laterally to the shorter side of the main settling compartment 146. Since the partition does not entirely divide the lower portion 192, the compartments 146, 147 communicate via in the lowermost region of the lower portion 192. Integrating the slurry compartment 147 into the collecting tank 144 has the benefit of easily allowing retrofitting an existing installation with a priming volume for secondary dewatering without major modifications of an existing concrete collecting tank 144 and also simplifies connection of the collecting gutters 150, 152 of the slurry overflow.
  • the existing "hot water tank” serves as a priming volume with sufficient suction head for the pumps 177, 178.
  • solids settled during normal operation (see above) in the main settling compartment 146 can also easily be recovered via the secondary dynamic dewatering unit 160 by operating the normal load pump 177.
  • the clean water compartment 145 is arranged as a separate tank or by means of a partition, laterally of the collecting tank 144, e.g. on the long side.
  • the clean water compartment 145 communicates with the main settling compartment 146, and optionally with the slurry compartment 147, only via an uppermost edge, e.g. via a spillover weir or spillover runners, so that due to gravity little if any solids spill over.
  • the slurry overflow 150, 152 are connected to feed drained excess slurry directly into the slurry compartment 147, according to arrow 193 of FIG.4. Accordingly, all slurry i.e. settled solids from the main settling compartment 146 and mainly, in case of excess slurry ("continuous overflow" mode), drained excess slurry from the slurry compartment 147 is pumped off, according to arrow 195, from the lowermost tip of the main settling tank 144 into the recirculation conduit 172 for recirculation into the process.
  • abrasion-resistant layers 196 e.g. with a coating of abrasion-resistant concrete.
  • Substantially clean water on the other hand spills over, according to arrows 197, from the main settling compartment 146 into the clean water compartment 145, from which it is pumped, according to arrow 199, via the water outlet 142 into the water-recycling circuit 148.
  • FIGS.5A&5B which partially illustrate a second embodiment of an installation 200 according to the invention, reference sings that identify identical or functionally similar parts are incremented by one hundred.
  • the installation 200 mainly differs from that of FIGS.1 -4 by the configuration of the slurry overflow 250.
  • the installation 200 has one slurry overflow 250 arranged upstream of the slurry inlet 234 of the main dynamic dewatering unit 230 in a single supply conduit 236, e.g. an upwardly open sloping runner or a pipeline. Upstream of the supply conduit 236, one granulation unit (not shown) or a pair of granulation units (not shown) are connected directly or by means of a Y-piece respectively.
  • the second variant of slurry overflow 250 comprises a spillway 251 arranged within the supply conduit 236 to draw off excess slurry. More specifically, the slurry overflow 250 comprises a skimmer-like spillway 251 configured so that any amount of inflowing slurry above the lip or crest of the spillway 251 flows out off the supply conduit 236, as best illustrated by arrows 255 in FIG.5B.
  • the limit at which slurry flows over i.e. the maximum rate of slurry inflow into the main dynamic dewatering unit 230, as illustrated by arrows 257, is chosen by properly setting the level (height) of the crest of the spillway 251 within the cross-section of the conduit 236.
  • the slurry overflow 250 of FIGS.5A&5B carries off any proportion of excess slurry that exceeds the maximum dewatering capacity even before such excess slurry can enter the dewatering drum 232.
  • a diversion conduit 253 Downstream the spillway 251 , a diversion conduit 253, in particular a piping or a runner, is connected to lead excess slurry directly into the slurry compartment 247 of the collecting tank 244.
  • the diversion conduit 251 similar to the drain conduit 154 of FIG.2, thus indirectly connects the spillway 251 to the inlet 262 of the secondary dynamic dewatering unit 260, e.g. a (set of) hydrocyclone(s).
  • FIG5A further illustrates a normal mode of operation without excess slurry, in which the secondary dynamic dewatering unit 260 is not operating. Hence, a typical load of solids settled in the main settling compartment 246 is re-circulated via the recirculation conduit 272 and via the bypass 275 back inside the dewatering drum 232.
  • FIG.5B illustrates a "continuous overflow" mode of operation, in which secondary dynamic dewatering unit 260 is operating. Hence, in "continuous overflow” mode, excess slurry is drained by virtue of the slurry overflow 250 and fed into the slurry compartment 247.
  • FIG.6 illustrates an installation 300 for processing molten material according to a third embodiment.
  • the installation 300 differs from the preceding embodiments mainly by a different type of main dynamic dewatering unit 330 and by a third variant of a slurry overflow 350.
  • Other components in FIG.6, which are substantially identical in function are not repeatedly described and have reference signs based on FIGS.1 -4 incremented to three hundred.
  • the main dynamic dewatering unit 330 in FIG.6 is of the scoop-wheel type. Accordingly, its mobile dewatering component is a vertical rotary scoop wheel 332 with colander-like external dewatering scoops (shovels) 373.
  • the dewatering scoops 373 shovel slurry out of a slurry tank 343, dewater the slurry and feed dewatered material onto a feeder such as a conveyor belt toward the material outlet 340. Due to a colander-like configuration of the dewatering scoops 373 and possibly the wheel 332 itself, water drips out of the dewatering scoops 373 downwardly, e.g. into the scoop wheel 332.
  • Filtered process water may then be recovered from inside the scoop wheel 332 and fed via a suitable conduit to a separate clean water tank 345 as seen in FIG.6.
  • the outlet of the clean water tank 345 also forms the water outlet 342 of the main dynamic dewatering unit 330.
  • a suitable scoop-wheel 332 is detailed e.g. in German patent DE 4 214 948 C1 and thus not further discussed.
  • the slurry overflow 350 in the installation 300 of FIG.6 comprises an overflow bin or overflow surge tank 353 that is arranged immediately upstream the slurry tank 343 of the main dynamic dewatering unit 330. Both supply conduits 336, 338 are arranged to feed slurry from the granulation units 310, 320 at first into the overflow surge tank 353.
  • the overflow surge tank 353 is provided with a drain in the form of an overfall 355, e.g. a lowered overflow edge, via which excess slurry naturally drains from the overflow surge tank 353 into an overflow collector 357.
  • the overflow surge tank 353 has an outlet opening 359 leading into the slurry tank 343.
  • the outlet opening 359 hence forms the slurry inlet 334 of the main dynamic dewatering unit 330.
  • the cross-section of the outlet opening 359 is dimensioned to have a maximum throughput that corresponds to the maximum admissible slurry inflow, i.e. to the dewatering capacity of the main dynamic dewatering unit 330. Accordingly, excess slurry cannot enter the slurry tank 343. No more than the admissible maximum inflow is received into the slurry tank 343 while any excess slurry necessarily spills via the overfall 355 into the overflow collector 357.
  • the outlet opening 359 may have a valve-like configuration in order to control the flow rate of slurry overflow into the overflow collector 357 in function of the processing capacity of the dynamic dewatering units 330, 360.
  • Suitable configurations of the schematically illustrated secondary dynamic dewatering unit 360 have been described above.
  • the secondary dynamic dewatering unit 360 may also include other types of motion-based i.e. dynamic dewatering units, preferably of reduced capacity, e.g. a dewatering capacity in the range of 20-50% of the dewatering capacity of the main dynamic dewatering unit 330.
  • the overflow collector 357 is connected via the recirculation conduit 372 with pumps 377 to the inlet 362 of the secondary dynamic dewatering unit 360.
  • the first outlet 364 is connected via a first return conduit 374 to return dewatered slurry (sludge) back to the main dynamic dewatering unit 330 and more specifically directly onto the dewatering scoops 373 of the scoop wheel 332 upstream their point of discharge onto the belt conveyor.
  • the second outlet 366 is also connected to a second return conduit 376 for returning water recovered by the secondary dynamic dewatering unit 360 immediately into the clean water tank 345.
  • FIG.7 illustrates a fourth embodiment of an installation 400, which essentially corresponds to that of FIG.6 except for the use of yet another different type of main dynamic dewatering unit 430.
  • the main dynamic dewatering unit 430 comprises a dewatering screw conveyor 433, e.g. according to WO 2006/108517 or WO 2005/031008.
  • the dewatering screw conveyor 433 has a mobile dewatering screw 435 arranged to rotate and thereby take slurry upwards out of the slurry tank 443 and to dewater the slurry during upward motion towards the material outlet 440.
  • the first return conduit 474 feeds sludge from the secondary dynamic dewatering unit 460 directly onto the dewatering screw 435, preferably onto a portion immediately above the level of slurry in the slurry tank 443.
  • the slurry overflow 450 has an identical configuration to that of FIG.6.
  • Other components of the installation 400 of FIG.7 are substantially identical in function and/or structure to those of FIGS.1 -5B and thus have reference signs based on FIGS.1 -4 incremented to four hundred.
  • operation of the installations 300, 400 of FIGS.6-7 corresponds to that described in relation to FIGS.1 -5B, and thus also includes the possibility of operating in "continuous overflow" mode, i.e. processing slurry in excess of the dewatering capacity of the main dynamic dewatering units 330, 430.
  • an installation according to the invention may also comprise other known types of motion-based main dewatering units, such as a horizontal dewatering disc according to US patent no. 3,912,487 or a dewatering bucket elevator according to US patent no. 3,615,329.
  • a horizontal dewatering disc according to US patent no. 3,912,487 or a dewatering bucket elevator according to US patent no. 3,615,329.
  • FIGS.1-4 182 signal line

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Manufacture Of Iron (AREA)

Abstract

L'invention concerne une installation (100) pour traiter un bain métallurgique, en particulier du laitier de haut-fourneau, comprenant au moins une unité de granulation (110; 120), qui produit une boue de granulés et d'eau, et une unité de déshydratation dynamique principale (130) qui est connectée en aval de l'unité de granulation. L'unité de déshydratation principale (130) comprend un composant mobile, en particulier un tambour de déshydratation rotatif (132), pour séparer la boue en granules et en eau. Selon l'invention, l'installation comprend: - un trop-plein de boue (150) qui est agencé en amont ou à l'entrée de l'unité de déshydratation principale (130) et en amont de la sortie d'eau (142), à partir duquel l'eau est récupérée à partir de l'unité de déshydratation principale (130), ce trop-plein étant configuré de manière à drainer l'excédent de boue qui dépasse la capacité de déshydratation de l'unité; - une unité de déshydratation secondaire (160) qui présente une entrée (162) qui est connectée pour recevoir l'excédent de boue en provenance du trop-plein, une première sortie (164) pour renvoyer une fraction déshydratée secondaire vers l'unité de déshydratation principale, et une deuxième sortie (166) pour récupérer de l'eau. L'installation est configurée de manière à drainer l'excédent de boue de façon à empêcher l'excédent de boue d'atteindre la sortie d'eau (142) et à séparer l'excédent de boue drainé en une fraction déshydratée secondaire qui est renvoyée vers l'unité de déshydratation principale (130) et une fraction d'eau secondaire qui est récupérée sans passer à travers l'unité de déshydratation dynamique principale (130). L'invention concerne également un procédé correspondant pour traiter une matière en fusion, en particulier pour granuler du laitier de haut-fourneau.
PCT/EP2010/068898 2009-12-03 2010-12-03 Installation et procédé de traitement de matière en fusion produite par une usine métallurgique, en particulier pour le traitement de laitier de haut-fourneau Ceased WO2011067400A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010900009389U CN202626211U (zh) 2009-12-03 2010-12-03 用于处理由冶金厂产生的熔融物质的设备和高炉设备

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU91626A LU91626B1 (en) 2009-12-03 2009-12-03 Installation and method for processing molten material produced by a metallurgical plant, in particular for processing blast furnace slag
LU91626 2009-12-03

Publications (1)

Publication Number Publication Date
WO2011067400A1 true WO2011067400A1 (fr) 2011-06-09

Family

ID=42270457

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/068898 Ceased WO2011067400A1 (fr) 2009-12-03 2010-12-03 Installation et procédé de traitement de matière en fusion produite par une usine métallurgique, en particulier pour le traitement de laitier de haut-fourneau

Country Status (3)

Country Link
CN (1) CN202626211U (fr)
LU (1) LU91626B1 (fr)
WO (1) WO2011067400A1 (fr)

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3615329A (en) 1969-03-18 1971-10-26 American Smelting Refining A recirculatory system for the granulation of molten slag
US3645708A (en) 1969-12-04 1972-02-29 Int Steel Slag Corp Steel slag handling system and method for using
US3912487A (en) 1974-06-24 1975-10-14 Mikhail Alexeevich Sharanov Apparatus for producing granulated slag
JPS53127393A (en) * 1977-04-12 1978-11-07 Kansai Kousetsu Kk Production device for waterr crushed slag
US4204855A (en) 1978-04-18 1980-05-27 SIDMAR Maritieme Staalnihverheid N.V. Siderurgie Maritime S.A. Apparatus for dewatering granulated-slag slurry
US4230477A (en) 1979-01-02 1980-10-28 Sharonov Mikhail A Apparatus for granulating molten slag
JPS5611238U (fr) * 1979-07-05 1981-01-30
US4758260A (en) 1985-04-02 1988-07-19 Ajo Stahlbau Gmbh & Co. Kg Process and device for producing granulated slag sand from blast furnace slag
LU86943A1 (fr) * 1987-07-17 1989-03-08 Wurth Paul Sa Procede de traitement de laitier metallurgique et installation pour la mise en oeuvre de ce procede
JPS6479044A (en) 1987-09-21 1989-03-24 Kawasaki Steel Co Device for producing water-granulated slag
US4909821A (en) 1984-12-28 1990-03-20 Olginsky Felix Y Apparatus for granulating metallurgical melt
DE4214948A1 (de) 1992-05-06 1993-11-11 Ajo Anlagentechnik Gmbh & Co K Entwässerungsanlage
EP0573769A1 (fr) 1992-06-02 1993-12-15 Paul Wurth S.A. Procédé pour la désulfuration de gaz formé lors de la granulation du laitier de haut fourneau
WO1996011286A1 (fr) 1994-10-06 1996-04-18 Paul Wurth S.A. Procede pour la granulation humide de laitier
DE10216415A1 (de) 2002-04-12 2003-10-23 Ajo Tec Gmbh Verfahren zur Trennung von Wasser und Feststoffen bei der Granulierung von Schmelzen sowie Vorrichtung zur Durchführung des Verfahrens
EP1422299A1 (fr) 2002-11-25 2004-05-26 Paul Wurth S.A. Tête de pulvérisation pour appareil de granulation
WO2005031008A1 (fr) 2003-09-25 2005-04-07 Voest-Alpine Industrieanlagenbau Gmbh & Co Procede et installation pour granuler des scories
WO2006005653A1 (fr) 2004-07-14 2006-01-19 Paul Wurth S.A. Procede et appareil pour une granulation de matiere fondue
WO2006108517A1 (fr) 2005-04-11 2006-10-19 Siemens Vai Metals Technologies Ltd. Procede et installation de granulation de scories

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3045380B2 (ja) * 1996-09-17 2000-05-29 順三 豊田 高炉水砕スラグの固結防止方法および固結防止システム

Patent Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3615329A (en) 1969-03-18 1971-10-26 American Smelting Refining A recirculatory system for the granulation of molten slag
US3645708A (en) 1969-12-04 1972-02-29 Int Steel Slag Corp Steel slag handling system and method for using
US3912487A (en) 1974-06-24 1975-10-14 Mikhail Alexeevich Sharanov Apparatus for producing granulated slag
JPS53127393A (en) * 1977-04-12 1978-11-07 Kansai Kousetsu Kk Production device for waterr crushed slag
US4204855A (en) 1978-04-18 1980-05-27 SIDMAR Maritieme Staalnihverheid N.V. Siderurgie Maritime S.A. Apparatus for dewatering granulated-slag slurry
US4230477A (en) 1979-01-02 1980-10-28 Sharonov Mikhail A Apparatus for granulating molten slag
JPS5611238U (fr) * 1979-07-05 1981-01-30
US4909821A (en) 1984-12-28 1990-03-20 Olginsky Felix Y Apparatus for granulating metallurgical melt
US4758260A (en) 1985-04-02 1988-07-19 Ajo Stahlbau Gmbh & Co. Kg Process and device for producing granulated slag sand from blast furnace slag
LU86943A1 (fr) * 1987-07-17 1989-03-08 Wurth Paul Sa Procede de traitement de laitier metallurgique et installation pour la mise en oeuvre de ce procede
JPS6479044A (en) 1987-09-21 1989-03-24 Kawasaki Steel Co Device for producing water-granulated slag
DE4214948A1 (de) 1992-05-06 1993-11-11 Ajo Anlagentechnik Gmbh & Co K Entwässerungsanlage
DE4214948C2 (de) 1992-05-06 1994-02-17 Ajo Anlagentechnik Gmbh & Co K Entwässerungsanlage
EP0573769A1 (fr) 1992-06-02 1993-12-15 Paul Wurth S.A. Procédé pour la désulfuration de gaz formé lors de la granulation du laitier de haut fourneau
WO1996011286A1 (fr) 1994-10-06 1996-04-18 Paul Wurth S.A. Procede pour la granulation humide de laitier
DE10216415A1 (de) 2002-04-12 2003-10-23 Ajo Tec Gmbh Verfahren zur Trennung von Wasser und Feststoffen bei der Granulierung von Schmelzen sowie Vorrichtung zur Durchführung des Verfahrens
EP1422299A1 (fr) 2002-11-25 2004-05-26 Paul Wurth S.A. Tête de pulvérisation pour appareil de granulation
WO2005031008A1 (fr) 2003-09-25 2005-04-07 Voest-Alpine Industrieanlagenbau Gmbh & Co Procede et installation pour granuler des scories
WO2006005653A1 (fr) 2004-07-14 2006-01-19 Paul Wurth S.A. Procede et appareil pour une granulation de matiere fondue
WO2006108517A1 (fr) 2005-04-11 2006-10-19 Siemens Vai Metals Technologies Ltd. Procede et installation de granulation de scories

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 197850, Derwent World Patents Index; AN 1978-90246A, XP002589532 *
LEYSER P ET AL: "INBA SLAG GRANULATION SYSTEM - ENVIRONMENTAL PROCESS CONTROL", IRON & STEEL TECHNOLOGY, AIST, WARRENDALE, PA, US, vol. 2, no. 4, 1 April 2005 (2005-04-01), pages 139 - 146, XP009051866, ISSN: 1547-0423 *

Also Published As

Publication number Publication date
CN202626211U (zh) 2012-12-26
LU91626B1 (en) 2011-06-06

Similar Documents

Publication Publication Date Title
US9593850B2 (en) Bottom ash dewatering system using a remote submerged scraper conveyor
JP2011005362A (ja) スラリー処理装置
CN108015094A (zh) 建筑垃圾分类装置
US3615329A (en) A recirculatory system for the granulation of molten slag
CN106976999A (zh) 混凝土搅拌站污水回收利用系统
US20150352467A1 (en) Remote submerged chain conveyor
KR20050009976A (ko) 응집 침전방법 및 장치
CN101223290B (zh) 炉渣粒化的方法和装置
CN2345265Y (zh) 一种污水净化器
WO2011067400A1 (fr) Installation et procédé de traitement de matière en fusion produite par une usine métallurgique, en particulier pour le traitement de laitier de haut-fourneau
US4230477A (en) Apparatus for granulating molten slag
CA1139940A (fr) Dispositif de granulation du laitier en fusion au jet d'eau
US20150192294A1 (en) Methods and Systems For Dewatering Bottom Ash Using A Remote Submerged Scraper Conveyor
CN1985009B (zh) 用于熔融物造粒的方法和装置
JP4077718B2 (ja) 廃棄物溶融処理における溶融物処理設備
WO2016115453A1 (fr) Procédés et systèmes de déshydratation de cendres résiduelles au moyen d'un entraîneur à raclettes immergé à distance
CN119588043A (zh) 一种长距离管输浆体浓缩系统异常工况在线调节处理系统及方法
WO2000012192A1 (fr) Appareil de separation des solides et des liquides
CN2589466Y (zh) 煤水净化煤泥回收机
CN205965271U (zh) 旋流沉砂分离装置
CN217773495U (zh) 一种用于煤矿井下沉淀池清淤的固液分离设备
CN111534653B (zh) 一种高炉水渣处理方法
CN210560514U (zh) 一种高炉渣处理装置
KR101147876B1 (ko) 용융체의 과립화 방법 및 장치
RU2766817C1 (ru) Установка для грануляции расплавов штейна, файнштейна и шлака

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 201090000938.9

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10787118

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10787118

Country of ref document: EP

Kind code of ref document: A1