US3802677A - Device for the permeability control of the layer of material to be sintered in plants for sintering ores, in particular iron ores - Google Patents

Device for the permeability control of the layer of material to be sintered in plants for sintering ores, in particular iron ores Download PDF

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Publication number
US3802677A
US3802677A US00281501A US28150172A US3802677A US 3802677 A US3802677 A US 3802677A US 00281501 A US00281501 A US 00281501A US 28150172 A US28150172 A US 28150172A US 3802677 A US3802677 A US 3802677A
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Prior art keywords
probes
layer
sintering
gas
permeability
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US00281501A
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English (en)
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G Sironi
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CONTRO SPERIMENTALE METALLURG
CONTRO SPERIMENTALE METALLURGICO SPA IT
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CONTRO SPERIMENTALE METALLURG
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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
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • C22B1/205—Sintering; Agglomerating in sintering machines with movable grates regulation of the sintering process
    • 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

Definitions

  • ABSTRACT The permeability of a layer of ore to be sintered is controlled by inserting a plurality of gas-injecting probes into the layer of ore with the probes extending horizontally and parallel to each other and spaced apart, and feeding gas to the probes from a manifold.
  • the gas pressure and/or flow rate are monitored as a measure of permeability of the layer and water is automatically supplied to the feed hopper for the material to be sintered, in response to the monitored values.
  • the present invention covers a device for the permeability control of the layer of the material to be sintered in plants for sintering ores, in particular iron ores.
  • the invention covers a device which allows one to measure and regulate, in a continuous way, the permeability of the mixture to be sintered, by maintaining continuously said permeability at about its maximum value, thus securing a high sintering speed, and permitting one to obtain both a larger production and a sintered product of improved quality.
  • the productivity of the sinter plant, the processing speed and the quality of the final product are functions of the permeability of the sintering bed which, in turn, is a function of the moisture of the mixture to be sintered. Because of this close dependence, many attempts have been made to regulate the permeability of the sintering layer, by acting upon the moisture. The simplest solution may appear that of maintaining the mixture moisture constantly equal to the value corresponding to the maximum permeability, but it is not possible to do so because the moisture of the mixture varies in accordance with the composition of the ore, its granulometry, and the amount of fines recycled.
  • the device of the present invention aims to eliminate the aforementioned drawbacks, allowing a continuous and reliable measurement of the permeability of the sinter mixture eliminating, in particular, the said air infiltrations along the edges of the suction box.
  • a specific object of the present invention is a device for the control of the permeability of the layer of sintering material in plants for the sinteringof ores, in particular iron ores, which comprises, in combination:
  • a collector system connected with one of the ends of the said probes a system to measure the pressure or the flow rate variations
  • a group of probes with an elongated shape, connected at one of their ends to a single collector or manifold and supplied, at the opposite end, with a series of holes, the said probes being set longitudinally, paralleling the motion direction of the moving belt, with their main axis at a constant distance from the said moving belt, and in the neighborhood of the horizontal central plane of the said sintering layer.
  • the probes are fed with a gas, preferably air, at a constant pressure and flow rate.
  • the said gas outflows from the said holes and crosses the sintering layer, meeting a resistance which is a function of the permeability of the said layer. Because of this resistance, variations either in the flow rate (if the operation is performed at a constant pressure), or in the pressure (if the operation is performed at a constant flow rate), are set up, the said variations being continuously measured with instruments and methods already known. After the first measurement of the said variation has been performed, a variation of the amount of water added from a water delivery conduit to the sintering mixture is effected automatically by means of a known device and subsequently another measurement of the said flow rate or pressure variations is performed.
  • the new variation of the amount of moistening water is maintained constant in the same direction as the first one while, if a decrease of permeability is detected, the variation of the moistening water is effected in an opposite direction with respect to the first one.
  • the said measurement operations of the gas flow rate variations and of the amount of moistening water variations are repeated continuously until the maximum value of the permeability of the layer is attained and, thereafter, they are continued in order to maintain the said permeability value at about its maximum.
  • the said probes penetrate inside the sintering layer for a distance ranging from 1.5 to 2.5 times the thickness of the said layer, as measured in a direction away from the device which makes the sintering layer thickness constant, and besides this penetration distance must not allow the probes themselves to reach into the zone covered by the ignition hood.
  • the device of this invention permits one to obtain very good results, it being possible to regulate the moisture of the mixture in an exceedingly good way (in fact, variations of the mixture permeability corresponding to variations of the humidity of the said mixture of the order of 0.1 0.2 percent are detected) that error being practically eliminated, with the use of several probes each supplied with several holes, which may occur with only a single probe, due to the fact that a fissure or a zone of a suddenly and casually lesser resistance than that of the remainder of the layer, may give rise to a completely abnormal permeability measurement and hence to abnormal additions of humidification water.
  • Another advantage of the device of the invention is its independence from the errors caused by air infiltrations, which are a characteristic of the aspiration hoods used for this purpose and which have rendered ineffectual other techniques previously suggested.
  • FIG. 1 represents a longitudinal, sectional view of the device according to the invention applied to sintering plant with a continuous sintering strand.
  • FIG. 2 represents a cross section of the device mentioned in FIG. 1.
  • the device according to the invention applied to a sintering plant of the type with a continuous conveyor belt 3, movable in the direction of arrow A, upon which, from hopper 1 1, an initial thin layer 12 of material, with a coarse size is unloaded; upon the said initial layer 12, the material with a finer grain size is placed when unloaded from hopper 13, until forming the final sintering layer 5, with a thickness s, inside which there penetrate the terminal lengths 15 of the probes 1, supplied with holes 6, arranged in a series in correspondence with some generatrices of the cylindrical mantle of the said probes 1.
  • the said terminal lengths are parallel to the motion direction of the continuous belt 3, and are closed at their ends 4.
  • the probes 1 are connected to the gas (air) inlet manifold, supplied with fittings 8 for connecting the pipes 9 with the said probes 1.
  • FIG. 2 represents a cross section of the agglomeration belt, at the probes level.
  • the probes five probes, supplied with holes 6 (see FIG. 1), located, as already mentioned for FIG. 1, along the terminal lengths 15, closed at their ends 4, and paralleling the continuous belt 3, in respect of which they are located above, at the height ht s/2.
  • the probes l are connected to the air inlet manifold 2, supplied with fittings 8 for connecting the pipes 9 with the said probes l.
  • the manifold 2 is fed with gas, preferably air, through the control flowmeter 16, along pipe 17, there being also a metallic pipe 18, ending at one end in an apparatus, already known, for the measurement and the recording of the said pressure variations and connected at the other end, to the manifold 2.
  • gas preferably air
  • the device of the invention is essentially constituted by the said group of probes 1, by the said manifold 2, connected to one of the ends 7 of said probes, and by a system for measuring the pressure, or the flow rate variations, which governs, for example through computing units, a system for the regulation of the amount of the water for moistening the material to be sintered.
  • the said probes 1 have the shape of an elongated cylindrical body, closed at the end 4, opposite to the said manifold 2, and with an external diameter ranging from 1 to 5 cm; the said probes 1 are, furthermore, placed with their main axis paralleling the said moving belt 3, and pointing towards the motion direction of the said moving belt, at a distance h from it s/2, and penetrating inside the layer for a length ranging from 1.5 to 2.5 times the values of the thickness s of the layer, however, in such a way as not to reach the zone covered by the ignition hood 19.
  • the said probes can vary in number, according to the width of the sintering layer, and they are located in a propor tion of one for each 0.3 to 0.7 m of width of the said layer, the outermost probes being displaced from the lateral walls of the said layer 5, by a distance no less than the thickness 5 of the layer itself. Furthermore, the probes are supplied, towards the end 4 opposite to the said manifold 2, with holes arranged in series, in correspondence with some generatrices, of the cylindrical mantle of the said. probes, for a length, measured from the closed end 4 of the said probes, ranging from 0.3 to 1.5 timesthe total thickness s of the sintering layer 5. The said holes 6 are arranged at least along four generatrices of the said cylindrical mantle and, furthermore, areequidistant from each other.
  • the said manifold 2 carries also the system for the measurement of flow rate or pressure variations, already known in the art and not shown in detail in the figures, which for example governs by means of a computing unit and in a way already known, e.g. through conduit 21 controlled by valve 22, the regulation of the amount of moistening water of the mixture to be agglomerated.
  • the device of the present invention allows one to attain many advantages in respect to similar known devices.
  • the great number of holes for the gas flow, and the plurality of the probes makes almost negligible the probability that either a zone with a casually greater permeability of the agglomeration layer, or the occlusion of one or more holes, may cause unreliable measurements and, therefore, erroneous estimates of the variations of the amount of moistening water.
  • the device is of small dimensions and easily assembled in any type of sinter plant and therefore its use is simple as it requires no important or substantial modification of the preexisting plant.
  • a device for the control of the permeability of a layer of material in plants for the sintering of ores comprising in combination 'a plurality of gas-injecting probes penetrating into said layer of material, a gas manifold having a plurality of outputs, a plurality of conduits connecting said manifold outputs with said plurality of gas probes, means feedling gas to said manifold, gas flow measurement means for said gas feed means, gas pressure measurement means connected to said manifold, means delivering water to the sintering mixture, and means responsive to said flow and pressure measurement means for automatically regulating the amount of water added to said layer of material.

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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)
US00281501A 1971-09-13 1972-08-17 Device for the permeability control of the layer of material to be sintered in plants for sintering ores, in particular iron ores Expired - Lifetime US3802677A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT52860/71A IT939417B (it) 1971-09-13 1971-09-13 Dispositivo di controllo della permeabilita dello strato di materiale da agglomerare in impian ti di agglomerazione di materiali in particolare di minerali di ferro

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US3802677A true US3802677A (en) 1974-04-09

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US (1) US3802677A (enrdf_load_stackoverflow)
JP (1) JPS5542305B2 (enrdf_load_stackoverflow)
BE (1) BE788748A (enrdf_load_stackoverflow)
DE (1) DE2245119A1 (enrdf_load_stackoverflow)
FR (1) FR2153970A5 (enrdf_load_stackoverflow)
GB (1) GB1390040A (enrdf_load_stackoverflow)
IT (1) IT939417B (enrdf_load_stackoverflow)
LU (1) LU66049A1 (enrdf_load_stackoverflow)
NL (1) NL7212393A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949974A (en) * 1972-11-08 1976-04-13 Kawasaki Steel Corporation Apparatus for preventing raw mix from being unevenly sintered by a sintering machine
FR2636138A1 (fr) * 1988-09-08 1990-03-09 Siderurgie Fse Inst Rech Procede de mesure en continu de la permeabilite d'un melange sur chaine d'agglomeration et dispositif permettant sa mise en oeuvre
CN104441371A (zh) * 2014-11-28 2015-03-25 中科院广州化学有限公司 一种浇注成型块状多孔树脂材料的孔隙检测方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49114502A (enrdf_load_stackoverflow) * 1973-03-07 1974-11-01
JPS5433804A (en) * 1977-08-23 1979-03-12 Nippon Kokan Kk <Nkk> Method of controlling sintering of metallurgical raw mathrials
JPS5824090B2 (ja) * 1979-11-28 1983-05-19 末崎 康永 木登機
JPS58141374U (ja) * 1982-03-19 1983-09-22 セイレイ工業株式会社 自昇型枝打機における変速装置
JPS5925625A (ja) * 1982-08-04 1984-02-09 奥島　謙司 枝打機
JPH0628536B2 (ja) * 1983-07-18 1994-04-20 セイレイ工業株式会社 枝打機の上昇下降切替装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2162782A (en) * 1935-04-11 1939-06-20 Smidth & Co As F L Nodulizing apparatus
US2767074A (en) * 1951-06-22 1956-10-16 Bethlehem Steel Corp Method of increasing sinter rate
US2914395A (en) * 1955-10-31 1959-11-24 United Steel Companies Ltd Preparation of material for sintering
US2931718A (en) * 1958-01-15 1960-04-05 Mckee & Co Arthur G Method and apparatus for automatically measuring and controlling moisture in a sinter mix or the like
GB1010488A (en) * 1962-09-29 1965-11-17 Metallgesellschaft Ag A method of regulating the water content of a blended charge to be fed into a sinter machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2162782A (en) * 1935-04-11 1939-06-20 Smidth & Co As F L Nodulizing apparatus
US2767074A (en) * 1951-06-22 1956-10-16 Bethlehem Steel Corp Method of increasing sinter rate
US2914395A (en) * 1955-10-31 1959-11-24 United Steel Companies Ltd Preparation of material for sintering
US2931718A (en) * 1958-01-15 1960-04-05 Mckee & Co Arthur G Method and apparatus for automatically measuring and controlling moisture in a sinter mix or the like
GB1010488A (en) * 1962-09-29 1965-11-17 Metallgesellschaft Ag A method of regulating the water content of a blended charge to be fed into a sinter machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949974A (en) * 1972-11-08 1976-04-13 Kawasaki Steel Corporation Apparatus for preventing raw mix from being unevenly sintered by a sintering machine
FR2636138A1 (fr) * 1988-09-08 1990-03-09 Siderurgie Fse Inst Rech Procede de mesure en continu de la permeabilite d'un melange sur chaine d'agglomeration et dispositif permettant sa mise en oeuvre
CN104441371A (zh) * 2014-11-28 2015-03-25 中科院广州化学有限公司 一种浇注成型块状多孔树脂材料的孔隙检测方法

Also Published As

Publication number Publication date
NL7212393A (enrdf_load_stackoverflow) 1973-03-15
JPS4839319A (enrdf_load_stackoverflow) 1973-06-09
GB1390040A (en) 1975-04-09
DE2245119A1 (de) 1973-03-22
JPS5542305B2 (enrdf_load_stackoverflow) 1980-10-29
BE788748A (fr) 1973-01-02
FR2153970A5 (enrdf_load_stackoverflow) 1973-05-04
LU66049A1 (enrdf_load_stackoverflow) 1973-01-17
IT939417B (it) 1973-02-10

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