EP1161567A1 - Procede de granulation de scories liquides - Google Patents

Procede de granulation de scories liquides

Info

Publication number
EP1161567A1
EP1161567A1 EP00984611A EP00984611A EP1161567A1 EP 1161567 A1 EP1161567 A1 EP 1161567A1 EP 00984611 A EP00984611 A EP 00984611A EP 00984611 A EP00984611 A EP 00984611A EP 1161567 A1 EP1161567 A1 EP 1161567A1
Authority
EP
European Patent Office
Prior art keywords
water
slag
granulating
pipe
tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00984611A
Other languages
German (de)
English (en)
Inventor
Alfred Edlinger
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.)
Holcim Ltd
Original Assignee
Holcim Ltd
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 Holcim Ltd filed Critical Holcim Ltd
Publication of EP1161567A1 publication Critical patent/EP1161567A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/06—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a liquid medium
    • 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
    • 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
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/072—Tanks to collect the slag, e.g. water tank

Definitions

  • the invention relates to a method for granulating liquid slags, e.g. molten blast furnace slag, in which the liquid slag is introduced into a water bath and on a device for carrying out the method.
  • liquid slags e.g. molten blast furnace slag
  • Molten blast furnace slag is usually produced at temperatures between 1350 and 1600 ° C.
  • cold water granulation is currently mostly used to achieve solidified slag particles, in which the liquid blast furnace slag is granulated with 6 to 12 m 2 of water per ton of slag.
  • the water used heats up to temperatures of around 85 ° C and is cooled down in cooling doors to temperatures below 40 ° C, whereby only the sensible heat of the water between around 40 and around 85 ° C is available as the cooling enthalpy ,
  • the water phase there is salting and, in part, evaporation of the water.
  • the aqueous phase must therefore be drained off at regular intervals and make-up water added.
  • the wastewater Due to the slag chemistry, the wastewater has relatively high pH values, with pH values of up to about 12 being observed. Such cooling water can therefore not be given to a receiving water without pretreatment, and it must therefore be neutralized and usually also additionally cooled. The suspended matter in the wastewater must also be sedimented.
  • the slag granulate discharged from such wet granulation has a residual moisture content of 8 to 24% by weight and must therefore be mechanically dewatered and thermally dried at a further cost.
  • the granulate is obtained with grain sizes between 10 and 1500 ⁇ as a relatively dense grain and has only low porosity, so that a subsequent further comminution process, and in particular especially a grinding process that is relatively energy consuming.
  • High amounts of hydrogen sulfide are obtained during the granulation, the H2S emission originating from a slag-water reaction and having to be eliminated by means of complex gas scrubbers.
  • calcium sulfide is converted with water to calcium oxide and hydrogen sulfide, which is present in the gas phase in a corresponding dilution with air.
  • the invention now aims to create a method of the type mentioned at the outset with which the cooling medium water can be used thermally more efficiently and at the same time H2S can be drawn off in a higher concentration.
  • the invention further aims to increase the slag and glass content and to improve the slag grindability compared to cold water granulation.
  • the method according to the invention essentially consists in that the cooling water is introduced at boiling temperature. By providing the cooling water at boiling temperature, the latent enthalpy of evaporation of the cooling water is available for rapid cooling, thereby maximizing the slag and glass content.
  • the granules surprisingly have a very low apparent density and float on the boiling water, whereby the slag grindability is significantly improved compared to grindability when using cold water granulation.
  • the granulate itself is discharged from the boiling water at a temperature which exceeds the boiling point of the water, the adhesive water during the granulation lataustrages already evaporates, so that a dry granulate is immediately formed. Since water is only discharged together with the granulate in vapor form, there is no waste water problem. Steam is then condensed and returned to the granulator together with make-up water to cover the water vapor losses.
  • the H2S formed in the slag-water reaction remains in the gas phase during the condensation of the water and is present here in a concentrated form, so that it can be worked up sensibly and economically.
  • the process according to the invention is advantageously carried out in such a way that the evaporated water is circulated after condensation and, after recirculation, is brought to the boiling point by controlled addition of slag or by introducing steam, the residence time of the slag granules in the boiling water being able to be reduced considerably.
  • it can advantageously be carried out in such a way that the boiling water is stirred during the granulation or is moved by blowing in steam. Due to the very short residence time of the slag granulate in the boiling water, the fine slag fraction practically does not hydrate. Due to the high water temperature, the solubility of H2S in boiling water is almost negligible.
  • the glass content of the coarse fraction is significantly higher than that of cold water granulation, the overall cement technology properties are improved, and it has been shown in particular that the early strength of corresponding mixed cements is almost 20% higher than the early strength of corresponding mixed cements, which is achieved using blast furnace granulated with cold water - slags are produced.
  • the boiling temperature can be adjusted in particular by means of the slag melt / water flow ratio so that the cooling water is always approximately at the boiling point.
  • the slag heat is sufficient, which is approx. 350 kW h thermal energy / t liquid slag.
  • Stirring the hot water by means of an agitator or by blowing steam leads to a further improvement in the heat transfer and at the same time to a reduction in the size of the granulate particles, which further maximizes the glass content.
  • H2S Due to the high concentration of H2S in the gas phase after condensation, sulfur can be recovered economically, as is possible, for example, with the Claus process.
  • the process according to the invention is therefore advantageously carried out in such a way that the H2S which accumulates in the gas phase above the condensing water from the circuit by chemical reaction, such as e.g. the Claus process is separated under oxidation to elemental sulfur.
  • sulfur is obtained from hydrogen sulfide, and in the Claus process, hydrogen sulfide is oxidized to sulfur in two stages. After a first oxidation of H2S to SO2, the SO2 formed can then react with further H2S to form elemental sulfur by means of a catalyst, such as a bauxite catalyst.
  • the sulfur obtained in this way is usually already very pure and the economics of the process result in particular from the relatively high sulfur-hydrogen concentration of the gas phase above the condensing steam.
  • the invention further relates to a device which is suitable for carrying out the method according to the invention.
  • the device has a pelletizing tank, with a pipe open on both sides being arranged at a distance from the bottom of the pelletizing tank.
  • the granulating basin contains the water bath into which the liquid slag to be granulated is introduced, whereby in the granulating basin a pipe open on both sides is arranged at a distance from the bottom of the granulating basin, the granulating basin and the pipe open on both sides are connected in the manner of communicating vessels are.
  • the open pipe protrudes from the water bath contained in the pelletizing tank.
  • the liquid slag is opened from the top Pipe introduced, the specific weight of the water bath enclosed by the pipe is reduced due to the heat and gas development, so that a buoyancy force arises within the pipe, which promotes the water bath contained in the pipe together with the granulated slag in height. In this way, the granulated slag can be conveyed above the level of the water bath located in the granulating basin, which considerably simplifies the discharge of the granulated slag.
  • the device is preferably developed in such a way that the tube is surrounded by a perforated sheet.
  • the granulated slag conveyed out of the pipe reaches the perforated plate and can be collected there and transported in a simple manner.
  • the design is advantageously designed such that an annular nozzle with nozzle openings directed towards the tube opening for water is arranged concentrically to the tube, furthermore the Ring nozzle can be connected to a drain in the bottom of the granulating tank via a pump.
  • a water jacket directed towards the pipe opening is then formed over the ring nozzle, with which the liquid slag can be introduced into the water bath.
  • the pump can be used to regulate the flow rate and thus to adjust the extent of the buoyancy within the tube by means of the pump with which the ring nozzle receives the water drawn from the outlet in the bottom of the granulating tank.
  • the slag 1 is a pelletizing tank, in which a pipe 2 open on both sides is arranged. There is a in the pelletizing tank Submitted water bath with boiling temperature, the water level is designated 3. The upper edge of the tube 2 protrudes above the water level 3, the granulated slag being conveyed onto a perforated plate 4 surrounding the tube 2 due to the buoyancy prevailing within the tube 2.
  • the slag which is denoted schematically by 5
  • the pipe 2 an annular nozzle 6 being arranged concentrically to the slag jet 5 and being drawn off from a drain in the bottom of the granulating basin 1 via a line 7 and a pump 8 Water is supplied.
  • the introduction of the slag leads to an evaporation of the boiling water and thus to a gas development, which causes a buoyancy in the direction of arrow 10 within the tube 2.
  • This buoyancy is used to convey the granulated slag to a level exceeding water level 3 and thus to facilitate the discharge of the granulated slag.
  • the constant escape of steam or boiling water from the tube 2 creates a circuit in which the water contained in the pelletizing tank 1 flows continuously into the area of the tube 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'invention concerne un procédé de granulation de scories liquides,(5) telles que des scories de haut fourneau fondues, selon lequel les scories liquides sont introduites dans un bain d'eau, l'eau de refroidissement étant à la température d'ébullition.
EP00984611A 2000-01-13 2000-12-18 Procede de granulation de scories liquides Withdrawn EP1161567A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0004400A AT408436B (de) 2000-01-13 2000-01-13 Verfahren zum granulieren von flüssigen schlacken
AT442000 2000-01-13
PCT/AT2000/000347 WO2001051674A1 (fr) 2000-01-13 2000-12-18 Procede de granulation de scories liquides

Publications (1)

Publication Number Publication Date
EP1161567A1 true EP1161567A1 (fr) 2001-12-12

Family

ID=3563757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00984611A Withdrawn EP1161567A1 (fr) 2000-01-13 2000-12-18 Procede de granulation de scories liquides

Country Status (4)

Country Link
EP (1) EP1161567A1 (fr)
AT (1) AT408436B (fr)
AU (1) AU2126301A (fr)
WO (1) WO2001051674A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT410219B (de) * 2001-05-10 2003-03-25 Tribovent Verfahrensentwicklg Verfahren zum zerstäuben von schmelzflüssigem material, wie z.b. flüssigen schlacken, glasschmelzen und/oder metallschmelzen sowie vorrichtung zur durchführung dieses verfahrens
AT516906A1 (de) 2015-03-13 2016-09-15 Radmat Ag Verfahren und Vorrichtung zum Granulieren von schmelzflüssigem Material
AT521769B1 (de) 2018-12-18 2020-06-15 Dipl Ing Alfred Edlinger Verfahren zum Verarbeiten von schmelzflüssigem Material

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB991600A (en) * 1960-08-16 1965-05-12 Stewarts & Lloyds Ltd Improvements relating to the granulation of iron or slag
DE2341847C2 (de) * 1973-08-18 1975-05-15 Hoesch Werke Ag, 4600 Dortmund Einrichtung zur Entwässerung von Schlacken
JPS5431097A (en) * 1977-08-13 1979-03-07 Sumitomo Metal Ind Ltd Production of metallurgical slag sand
DE3220624A1 (de) * 1982-05-03 1983-11-10 Klöckner-Humboldt-Deutz AG, 5000 Köln Vorrichtung zur kontinuierlichen granulierung von schlacken mittels kuehlfluessigkeit
AT405511B (de) * 1997-10-29 1999-09-27 Holderbank Financ Glarus Verfahren zum granulieren und zerkleinern von schmelzflüssigem material sowie vorrichtung zur durchführung dieses verfahrens

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0151674A1 *

Also Published As

Publication number Publication date
AT408436B (de) 2001-11-26
ATA442000A (de) 2001-04-15
AU2126301A (en) 2001-07-24
WO2001051674A1 (fr) 2001-07-19

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