WO2005090614A1 - Nouveaux agents de desulfuration permettant de diminuer la teneur en soufre de coulees de fonte a un niveau ultra bas - Google Patents

Nouveaux agents de desulfuration permettant de diminuer la teneur en soufre de coulees de fonte a un niveau ultra bas Download PDF

Info

Publication number
WO2005090614A1
WO2005090614A1 PCT/HU2005/000030 HU2005000030W WO2005090614A1 WO 2005090614 A1 WO2005090614 A1 WO 2005090614A1 HU 2005000030 W HU2005000030 W HU 2005000030W WO 2005090614 A1 WO2005090614 A1 WO 2005090614A1
Authority
WO
WIPO (PCT)
Prior art keywords
desulphurating
metallic
agents
metallic component
agent
Prior art date
Application number
PCT/HU2005/000030
Other languages
English (en)
Inventor
István TAMÁS
Original Assignee
Tamas Istvan
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 Tamas Istvan filed Critical Tamas Istvan
Publication of WO2005090614A1 publication Critical patent/WO2005090614A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C21C1/025—Agents used for dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C21C7/0645—Agents used for dephosphorising or desulfurising

Definitions

  • the invention relates to new desulphurating agents to decrease sulphur content of iron melts to an ultra low level (to at least 0,001% or lower), and a method to produce desulphurating agents.
  • CaSi(Fe) and CaAI(Fe) alloys are currently used to decrease sulphur content of hot steel batches.
  • CaSi(Fe) alloy in the form of powder is burdened to the steel in a ladle by means of argon carrier gas.
  • argon carrier gas Such a solution is described in the article "Purity requirements of steel types X65-X80 ERW on producing pipes for long-distance conduits - I.D. Simpson-Z. Tritsiolis-L.G. More (Dunaferr M ⁇ - szaki Gazdasagi K ⁇ zlemenyek, 2002/3 pp. 129-137).
  • Admissible upper limit for sulphur content in these types of steel is 0,003%, therefore these steels belong to the group of steels having extremely low sulphur content.
  • the rapidly growing metal-vapour bubbles will be combined with each other and they create great bubbles with a diameter of 1-10 cm causing a very intensive bath motion and a spattering of steel, while spouting out of the bath before the calcium would be utilised.
  • Their calcium content combine the oxygen in the air bringing about a high generation of heat, glare light and dense white fume, consequently, the yield of the calcium will be reduced. Thence, using conventional materials, the yield of the calcium is only between 70 and 80 %.
  • the process using CaSi(Fe) alloys to remove sulphur from the steel melt always pertains increasing silicon content thereof, since burdening calcium of 1 kg into the steel melt increases the silicon content by 3,1 kg (rate of Si/Ca is 2,1). Considering a calcium yield of 70 % in the case of conventional CaSi(Fe) alloy the rate of Si/Ca may increase above 3. The silicon content increased above a predetermined limit may cause an adverse effect in most steels. Therefore, these steels cannot be desulphurated by conventional CaSi(Fe) alloys.
  • the burdening of sulphur into the steel by pig-iron batch material of 80% will be less than 0,0008%. Therefore, the above condition of 0,000 ⁇ S% ⁇ 0,001 (which is a requirement for the steel having ultra low sulphur content) can be achieved if the sulphur content burdened by scrap steel of 20% is lower than 0,0002%. In this case the sulphur content of the scrap steel must be lower than 0,01 %. If it is not the case, also the steel melt has to be desulphurated. It is clear, that a part of the sulphur content in the scrap being above 0,01% must be eliminated. This quantity of sulphur can be decreased by assorting the steel scrap, and this is an operation that repays doing.
  • the Mg containing materials are more and more frequently used in reducing sulphur content of liquid pig-iron.
  • the most frequently used materials contain 85 w% CaC 2 powder with 15 w% Mg powder, or 80 w% CaO powder with 20 w% Mg powder, respectively.
  • the CaC 2 or CaO powder acts as primary desulphurating agent, not disturbed by the Mg powder. Since this action will be followed by a desulphurization process using injected Mg powder only in order to further decrease the S content, some reduction can be obtained in the amount of CaC 2 or CaO powder used.
  • the rapidly growing Mg-vapour bubbles will be combined with each other causing a very intensive bath motion and a spattering of steel, while spouting out of the bath before the Mg would be utilised, and their Mg content burns out bringing about a high generation of heat, glare light and dense white fume. Consequently, using conventional materials, the utilisation factor of the Mg is only between 50 and 80 % depending on the temperature and initial S content of the iron melt.
  • first object of this invention is to eliminate any risk of spouting the melt out of the bath and generation of excess heat, glare light, dense white fume and adverse environmental effects accompanying the use of conventional treating alloys.
  • the second object of the invention is to provide desulphurating agents the use of which is not more expensive than that of the conventional solutions, but suitable for producing iron melts (liquid steel, liquid pig-iron, cast iron melt) having especially good quality and a S content less than 0,001 %.
  • Further aspect of the invention is to provide a method to produce desulphurating agents according to the invention at an industrial scale.
  • the invention relates to new desulphurating agents for decreasing sulphur content of iron melts to ultra low level (to at least 0,001 % or lower), and said agents contain 30-60 w% of non-metallic and 70-40 w% of metallic components, the non-metallic component being tricalciumaluminate (3CaO.AI 2 0 3 ) complex oxide compound, and the metallic component being a Mg or Ca based alloy constituting stable sulphides (CaS or MgS), and wherein the least metallic and non-metallic components form molecular pairs with each other.
  • the non-metallic component being tricalciumaluminate (3CaO.AI 2 0 3 ) complex oxide compound
  • the metallic component being a Mg or Ca based alloy constituting stable sulphides (CaS or MgS)
  • the least metallic and non-metallic components form molecular pairs with each other.
  • % means mass % if it is not otherwise indicated.
  • said metallic component is a Ca based metallic alloy, and for liquid pig-iron or cast iron melt a Mg based metallic alloy is used.
  • Desulphurating agent for decreasing sulphur content of steel melt to ultra low level contains advantageously a least metallic component belonging to the least non-metallic component (3CaO.AI 2 0 3 molecule), which is a Ca based metallic alloy 3[CaAI 2 ](Fe), and it contains Ca in a range between 30-40 %, preferably 33-37 %, Al between 40-54 %, preferably 46-50 %, and Fe 6-30 %, preferably 13-21 %.
  • This kind of desulphurating agent may be produced according to the reaction scheme (1):
  • reaction scheme (1) denotes an Al-Fe alloy containing 20 % of Fe and 80 % of Al
  • reaction scheme (2) denotes a Ca-AI-Fe alloy containing 35 % of Ca and 48% of Al in the form of a compound CaAI 2 , as well as 17 % of Fe.
  • Fe does not participate in the reaction, but its presence is absolutely necessary, namely - according to my experience - the reaction equation
  • said metallic component belonging to the non-metallic component is a Ca based metallic alloy 3[CaSi 2 ](Fe), and containing Ca in a range between 30-38 %, preferably 32-36 %, Si between 42-53 %, preferably 47-51 %, and Fe 9-28 %, preferably 13-21%.
  • This kind of desulphurating agent may be produced according to the reaction scheme (2):
  • said metallic component belonging to the non-metallic component is Ca based metallic alloy 5Ca6Si(Fe), and containing Ca in a range between 48-52 %, Si between 40-44 %, and Fe 4-12%.
  • This kind of desulphurating agent (or desulphurating agent 3) may be produced according to the reaction scheme (3):
  • [a5] denotes an alloy containing 10,4 % of Fe, 16 % of Al, 23,7 % of Ca and 49,9 % of Si.
  • the desulphurating agent as a product [a6] contains 8 % of Fe, and (in the form of 5Ca6Si) 42 % of Si and 50 % of Ca.
  • said least metallic component belonging to the least non-metallic component (3CaO.AI 2 O 3 molecule) is a Mg based metallic alloy 3(Mg 2 Si)(Fe), or 4(Mg 2 Si)(Fe), or 5(Mg 2 Si)(Fe), each containing Mg in a range between 56- 60 %, Si between 31-35 %, and Fe 5-13%, but the rate of sizes as well as masses of these metallic components is 3 : 4 : 5.
  • These kinds of desulphurating agent (or desulphurating agent 4, 5 or 6) may be produced according to the reaction schemes (4), (5) and (6):
  • [a10] denotes an alloy containing 11 ,34 % of Fe, 13,1 % of Al, 41 ,4 % of Mg and 34,16 % of Si.
  • Each desulphurating agent as a product [a8] includes a metallic component having the same composition and containing 10,86 % of Fe, and (in the form of Mg 2 Si) 32,58 % of Si and 56,56 % of Mg, only the ratio of [a8] to the non-metallic component differs in the three reaction schemes, respectively.
  • desulphurating agents for use in liquid pig-iron or cast iron melt wherein we varied the ratio of metallic component to the non-metallic component
  • this ratio may be varied in case of desulphurating agents for use in steel melts as well.
  • desulphurating agents containing as metallic component 5[CaAI 2 ](Fe) or 5[CaSi 2 ](Fe) besides the non-metallic component 3CaO.AI 2 0 3 may be prepared.
  • said components are evenly distributed in said desulphurating agent, and a metallic component is attached to each non-metallic component forming of a pair therewith (which can be considered as a metallic - non-metallic pair of molecules). It can be assumed, that these pairs of molecules are attached to each other by its opposite sides. Reactions take place in atomic order, therefore, the dimensional order of this components is in the range between 10 - 30 . 10 "10 m.
  • This invention also discloses a method for preparing new desulphurating agents.
  • the method includes the following steps: - metering adequate quantity of ingoing materials of each desulphurating agents, namely: - calcined limestone and metallic alloy (a1), in the case of desulphurating agent 1 , - calcined limestone and metallic alloys (a1) and (a3), in the case of desulphurating agent 2, - calcined limestone and metallic alloy (a5), in the case of desulphurating agent 3, - burnt dolomite and metallic alloy (a7), (a9), or (a10), in the case of desulphurating agent 4, 5 or 6, then - individually mixing each reactive components metered in the first step, crushing and homogenizing the mixture by further mixing, - briquetting and optionally preheating the powder obtained, - vacuum sintering briquettes in a temperature between 850 - 1100 °C, and in a pressure between 10 ⁇ 6 - 10 "5 bar, and - optionally crushing and milling sintered briquettes of desulphurating agents before using.
  • Cost effective calcined limestone (CaO) or burnt dolomite (CaO.MgO) may be used as ingoing material, instead of using most expensive pure CaO or a mixture of pure CaO and MgO.
  • Metallic alloys reacting with said ingoing materials can be purchased commercially or can be prepared by methods well known in the art.
  • the adequate quantity of reagents will firstly be metered depending on the composition of the desulphurating agent to be produced in accordance with reaction schemes (1) - (6), namely metering for the preparation of steel desulphurating agents (agents 1 , 2 and 3) calcined limestone and metallic alloy [a1] in the case of desulphurating agent 1 , metallic alloy [a1] and [a3] in the case of desulphurating agent 2, metallic alloy [a5] in the case of desulphurating agent 3; furthermore, metering to produce pig-iron desulphurating agents burnt dolomite containing CaO.MgO and metallic alloy [a7] in the case of desulphurating agent 4, metallic alloy [a9] in the case of desulphurating agent 5, metallic alloy [a10], in the case of desulphurating agent 6, then mixing each reactive component - calcined limestone or burnt dolomite and appropriate metallic component - metered in the first step, and crushing the particles in the
  • desulphurating agents according to the invention are cooled, then optionally crushed and milled the briquettes of desulphurating agents into granules having a maximal particle size of 20 mm, and the crushed material is assorted in two size fractions containing particles of at most 2 mm and between 2-20 mm, respectively.
  • the above mentioned chemical processes according to the different reaction schemes take place during the vacuum sintering step of the method according to the invention.
  • the invention involves all desulphurating agents produced by the method described above.
  • the desulphurating agents according to the invention are solid, they may be broken (crushed, milled), their softening temperature is above 850 °C, in the air they do not ignite even at that temperature, their powder is neither inflammable nor explosive, their colour is between dark grey and black and their density is between 1 ,8 and 2,6 kg/cm 3 . Contrary to conventional desulphurating agents, the desulphurating agents according to the invention may also be applicable without crushing, i.e. in the form of greater pieces of material, since the reaction takes place slowly, and the component -Ca or Mg vapour - necessary to the desulphurization will be evolved discontinuously or in a moderated manner from the desulphurating agent.
  • the goal to be achieved is that the uplift time be longer than the time necessary to the complete deperition of the bubble.
  • a Ca metal vapour bubble having a diameter of 2 cm has an uplift time of 0,0045 s, according to the Stokes formula. If its diameter is 2 . 10 ⁇ 3 cm, the uplift time is 4500 s. As the dimension of the bubble is getting smaller so the uplift time is getting longer at a quadratic rate. It is essential for this reason, that the bubble be as small as possible: having a diameter of 10 "9 - 10 ⁇ 8 m, approximately.
  • the melting of the 3CaO.AI 2 0 3 starts at a temperature of 1535 °C, thence when this one is chosen, it will be transformed to such a melt at a temperature of 1640 °C, which has a melting point decreasing by joining together with the oxysulphide.
  • a liquid oxysulphide slag having a chemical composition of CaS.CaO.AI 2 0 3 .3CaO.AI 2 0 3 obtained this way is able to grow by virtue of further coagulation, thence it uplifts onto the surface of the steel melt at a gradually increasing speed and decontaminating the steel also from the solid oxysulphides.
  • the reaction of the components achieves during vacuum reduction sintering step as follows: Reactive materials compacted as briquettes transform into metallic and non-metallic molecules, according to the reaction schemes (1) - (6). Reaction does not commence all at once in each part of the material, but always on the surface of a briquette, when the temperature and vacuum pressure reach an adequate value.
  • Reactive materials CaO and CaO.MgO are always in solid state in the temperature of sintering, therefore its position is fixed.
  • the reactive metallic alloys have to have a melting temperature, that makes it possible these alloys to melt in the temperature of sintering, and becoming liquid, to be able to displace.
  • the metallic components of different kinds of desulphurating agents according to the invention are formed at the place of this alloying process, such as 3[CaAI 2 ](Fe), 3[CaSi 2 ](Fe), 5Ca6Si(Fe), 3[Mg 2 Si](Fe), 4[Mg 2 Si](Fe), 5[Mg 2 Si](Fe).
  • These desulphurating agents can be differentiated from each other by their typical metallic components.
  • the temperature of sintering has to be chosen in such a way, that the melting temperature of each metallic components be higher of that sintering temperature.
  • the metallic component just being formed at the temperature of sintering solidifies by joining to and forming a pair with a non-metallic molecule developed close beside it just a moment earlier.
  • This pair will be isolated from the following metallic component by a newly created non- metallic component, and the chemical reaction continues up to the end of the transformation of all reactive material into metallic and non-metallic components each having a molecular range.
  • Chemical reaction starting on the surface of the briquettes advances in the direction of the core of the briquette in such a way, that an elevated temperature level advances from the outer shell already solidified and having a higher temperature into the core of the briquette.
  • the period of time necessary to the transformation is determined by time passed between the moment of commence of the process in the surface and meeting the initial temperatures starting on the opposite sides of the briquette. Thence the temperature of all briquette will start rising onto the temperature of sintering. Nevertheless, as I mentioned, the sintering temperature must be lower than the melting point of the metallic component created, since in the case the metallic component becomes molten, said pair of molecules formed with the non- metallic component decomposes and the metallic component segregates and joins further metallic components, its dimension gets bigger, therefore the whole bulk of material will be damaged.
  • the exact sintering temperature to be applied in the method according to the invention has to be determined experimentally, taking into account above conditions.
  • Well known equilibrium diagrams (describing CaO- Al 2 0 3 , Ca-Si, Al-Ca, Al-Fe and Mg-Si systems) may assist the person skilled in the art in determining this temperature.
  • This material being highly fluid at the temperature of the treatment (1640 °C) and having a molar weight of 428 is able to solve also the solid CaS having a molar weight of 72.
  • the product of this reaction is a fluid oxysulphide slag CaS.2(2CaOAI 2 0 3 ), which can grow by coagulation, therefore it uplifts from the steel bath with a speed rising in accord with the square function of its radius, then dissolves in the slag floating on the surface of the bath, hence enriching CaS, CaO and Al 2 0 3 content of the slag. Consequently, the desulphurating agents according to the invention can clear away said modified, solid oxysulphide inclusions, in contrast with conventional materials.
  • the steel purified from the oxysulphides will have enhanced ductile properties like elongation, contraction, impact strength and endurance limit.
  • the application of new desulphurating agents according to the invention offers also a solution of easily making up the shortage relating to evaporation of Ca due to cooling during transportation of the ladle into the casting position as well as in the course of casting after desulphuration of the steel melt. This recovery may be owed to the fact, that desulphurating agents according to the invention do not bring about bath motion and it is very easy to solve burdening them into the steel melt during transportation of the ladle into the casting position as well as in the course of casting, too.
  • Reducing sulphur content of steel melt by the desulphurating agents according to the invention has several advantages: desulphuration takes place in few minutes during drawing, no separate time to do it, the yield of the desulphurating Ca and Mg is practically 100 %, it is not dangerous, no pollution and adverse effects to the health.
  • the invention will now be further described by way of examples. The structures of the desulphurating agents produced in the examples was confirmed by X-ray diffraction procedure. Examples Example 1. Producing desulphurating agent (1) containing 3CaO.AI?Q 3 as non- metallic component and 3FCaAI?l (Fe) as metallic component.
  • Homogenous mixture having a particle size of up to 1 ,00 mm was prepared using 336 kg of calcined limestone and 270 kg of reactive alloy (containing 216 kg of Al, and 54 kg of Fe), and briquetting this mixture at a pressure of 1 ,2 t/cm 2 . Briquettes were preheated at 300 °C, then a vacuum reduction sintering process took place at a temperature of 1050 °C and at a pressure of 3.10 "6 bar. The reaction described by the reaction scheme (1) takes place in this process. This way 606 kg of desulphurating agent containing 44,55 % non- metallic component (270 kg) and 55,45 % metallic component (336 kg) was obtained. Comparative Example 1.
  • a comparative test was made using a conventional desulphurating agent and the agent according to the Example 1.
  • Steel containing 0,1 % C, 0,415 % Mn, 0,186 % Si, 0,010 % S, 0,012 % P, 0,009 % Al, and 0,000 % Ca was treated by a conventional alloy CaAI(Fe) by means of which 0,22 kg/ton of Ca was burdened into the batch.
  • the S content of the steel decreased to 0,003 % from 0,01 %
  • Al content increased to 0,025 % from 0,009 %
  • Ca content to 0,0062 % from 0,000 %.
  • Yield of Ca was 72,5 %.
  • Homogenous mixture having a particle size of up to 1 ,00 mm was prepared using 336 kg of calcined limestone and 291 ,5 kg of reductive alloy (containing 54 kg of Al, and 69,5 kg of Fe, and 168 kg of Si) forming metallic component, and briquetting this mixture at a pressure of 1 ,0 t/cm 2 . Briquettes were preheated at 100 °C, then a vacuum reduction sintering process took place at a temperature of 1000 °C and at a pressure of 1 .10 "6 bar. The reaction described by the reaction scheme (2) takes place in this process.
  • Homogenous mixture (670 kg) having a particle size of up to 1 ,00 mm was prepared from 336 kg of calcined limestone and 334 kg of reactive alloy (containing 54 kg of Al, 80 kg of Ca, 168 kg of Si and 32 kg of Fe), and briquetting this mixture at a pressure of 1 ,0 t/cm 2 . Briquettes were preheated at 100 °C, then a vacuum reduction sintering process took place at a temperature of 1100 °C and at a pressure of 10 ⁇ 5 bar. The reaction described by the reaction scheme (3) takes place in this process.
  • each desulphurating agent to desulphurate liquid steel described in above Examples has a feature of comprising metallic and non- metallic components being in such an arrangement, that non-metallic molecules isolate metallic molecules being close beside and attached thereto, from which the metal vapour bubble evolutes.
  • the Si/Ca 3 ratio featuring conventional alloys CaSi(Fe) - taking into account the 70 % yield of the Ca, too - might be reduced to a value of 1 ,4 or 0,84, and therefore the treatment of steel melt by desulphurating agents becomes possible in a wider range due to their lower Si content in comparison to conventional CaSi(Fe) alloys.
  • Above theory and observations relating to the evolution of Ca metallic vapour during desulphuration of steel melt also apply to the evolution of metallic vapour of Mg in the case of liquid pig-iron. The problem concerning sudden evaporation of Mg and its consequences may be solved by the same way.
  • Homogenous mixture (613,86 kg) having a particle size of up to 1 ,00 mm was prepared by using 289 kg of burnt dolomite and 324,86 kg of reactive alloy (containing 54 kg of Al, 121 ,56 of Mg, 112 kg of Si and 37,3 kg of Fe), and briquetting and vacuum reduction sintering this mixture at a temperature of 870 °C and at a pressure of 2 .10 "6 bar. The reaction takes place according to the reaction scheme (5). This way 613,86 kg of desulphurating agent containing 44 % non- metallic component 3CaO.AI 2 O 3 (270 kg) and 56 % metallic component 4[Mg 2 Si] (Fe) (343,86 kg) was obtained.
  • a powder mixture (699,784 kg) having a particle size of up to 1 ,00 mm was prepared by using 289 kg of burnt dolomite and 410,784 kg of reactive alloy (containing 54 kg of Al, 170,184 kg of Mg, 140 kg of Si and 46,6 kg of Fe), briquetting this mixture, then a sintering process took place at a temperature of 905 °C and at a pressure of 5.10 "6 bar. The reaction takes place according to the reaction scheme (6).
  • above melt was treated by desulphurating agent according to the Example 6, and the quantity of Mg burdened into the batch was only 0,299 kg/ton to achieve the same result of desulphuration. The yield of Mg was 99,1 %.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

La présente invention concerne de nouveaux agents de désulfuration permettant de diminuer la teneur en soufre de coulées de fonte à un niveau ultra bas (jusqu'au moins 0,001 % ou en-dessous), lesdits agents contenant entre 30 et 60 % en poids d'un composant non métallique et entre 70 et 40 % en poids d'un composant métallique, le composant métallique étant un oxyde complexe d'aluminate de tricalcium (3CaO. Al2O3) et le composant métallique étant un alliage à base de Mg ou de Ca constituant des sulfures stables (CaS ou MgS), les composants métallique et non métallique formant des paires moléculaires stables les uns avec les autres. L'invention concerne également un procédé de production des agents de désulfuration selon l'invention. Ledit procédé comprend les étapes consistant à mesurer une quantité adéquate de matériaux entrants de chacun des agents de désulfuration, puis à mélanger individuellement chacun des composants réactifs mesurés lors de la première étape, à écraser et à homogénéiser le mélange par malaxage supplémentaire, à briqueter et éventuellement à préchauffer la poudre obtenue, à fritter sous vide des briquettes à une température comprise entre 850 et 1100 °C et à une pression comprise entre 10-6 et 10-5 bars, et éventuellement à écraser et à moudre les agents de désulfuration frittés avant utilisation.
PCT/HU2005/000030 2004-03-23 2005-03-23 Nouveaux agents de desulfuration permettant de diminuer la teneur en soufre de coulees de fonte a un niveau ultra bas WO2005090614A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HUP0400630 2004-03-23
HU0400630A HUP0400630A2 (en) 2004-03-23 2004-03-23 New, molecule-size desulphurizing agents consisting of non metallic and metallic components for reducing the sulphur content of iron melts to an ultra low level (0<s%<0,001) and a method for producing said material

Publications (1)

Publication Number Publication Date
WO2005090614A1 true WO2005090614A1 (fr) 2005-09-29

Family

ID=89982074

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/HU2005/000030 WO2005090614A1 (fr) 2004-03-23 2005-03-23 Nouveaux agents de desulfuration permettant de diminuer la teneur en soufre de coulees de fonte a un niveau ultra bas

Country Status (2)

Country Link
HU (1) HUP0400630A2 (fr)
WO (1) WO2005090614A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103468343A (zh) * 2013-09-06 2013-12-25 鞍钢股份有限公司 一种含碳球团用固硫剂及其制备方法
CN109748326A (zh) * 2019-03-22 2019-05-14 西南石油大学 一种利用溶胶-凝胶法制备铁铝酸四钙的工艺

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4154605A (en) * 1978-03-08 1979-05-15 Skw Trostberg Aktiengesellschaft Desulfurization of iron melts with fine particulate mixtures containing alkaline earth metal carbonates
US4209325A (en) * 1977-12-16 1980-06-24 Foseco International Limited Desulphuration of metals
US4435210A (en) * 1982-02-12 1984-03-06 Showa Denko Kabushiki Kaisha Refining agent of molten metal and methods for producing the same
EP0257718A1 (fr) * 1986-08-25 1988-03-02 The Dow Chemical Company Agents insufflables pour métaux fondus
US4956009A (en) * 1988-08-17 1990-09-11 Reactive Metals And Alloys Corporation Calcium alloy steel additive and method thereof
US5407459A (en) * 1993-09-23 1995-04-18 Alcan International Limited Process for the preparation of calcium aluminates from aluminum dross residues
WO2000011227A1 (fr) * 1998-08-25 2000-03-02 Partek Nordkalk Aktiebolag Produit long utilise pour la desulfuration d'un bain d'acierage
EP1146131A2 (fr) * 2000-04-10 2001-10-17 Rossborough Manufacturing Co., L.P. Agent de désulfuration à base du magnésium
EP1146130A2 (fr) * 2000-04-10 2001-10-17 Rossbourugh Manufacturing Co., L.P. Agent d'injection à base du magnésium et procédé pour le traitement de la fonte et de l'acier en fusion

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4209325A (en) * 1977-12-16 1980-06-24 Foseco International Limited Desulphuration of metals
US4154605A (en) * 1978-03-08 1979-05-15 Skw Trostberg Aktiengesellschaft Desulfurization of iron melts with fine particulate mixtures containing alkaline earth metal carbonates
US4435210A (en) * 1982-02-12 1984-03-06 Showa Denko Kabushiki Kaisha Refining agent of molten metal and methods for producing the same
EP0257718A1 (fr) * 1986-08-25 1988-03-02 The Dow Chemical Company Agents insufflables pour métaux fondus
US4956009A (en) * 1988-08-17 1990-09-11 Reactive Metals And Alloys Corporation Calcium alloy steel additive and method thereof
US5407459A (en) * 1993-09-23 1995-04-18 Alcan International Limited Process for the preparation of calcium aluminates from aluminum dross residues
WO2000011227A1 (fr) * 1998-08-25 2000-03-02 Partek Nordkalk Aktiebolag Produit long utilise pour la desulfuration d'un bain d'acierage
EP1146131A2 (fr) * 2000-04-10 2001-10-17 Rossborough Manufacturing Co., L.P. Agent de désulfuration à base du magnésium
EP1146130A2 (fr) * 2000-04-10 2001-10-17 Rossbourugh Manufacturing Co., L.P. Agent d'injection à base du magnésium et procédé pour le traitement de la fonte et de l'acier en fusion

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"Slag Atlas, 2nd Edition", 1995, VERLAG STAHLEISEN GMBH, DÜSSELDORF, ISBN: 3-514-00457-9, XP002335664 *
DATABASE COMPENDEX [online] ENGINEERING INFORMATION, INC., NEW YORK, NY, US; ANDERSSON M ET AL: "The influence of different calcium-based additions on desulphurisation and inclusion characteristics", XP002335186, Database accession no. E2001266562556 *
SCAND J METALL; SCANDINAVIAN JOURNAL OF METALLURGY JUNE 2001, vol. 30, no. 3, June 2001 (2001-06-01), pages 127 - 135, XP002335184 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103468343A (zh) * 2013-09-06 2013-12-25 鞍钢股份有限公司 一种含碳球团用固硫剂及其制备方法
CN109748326A (zh) * 2019-03-22 2019-05-14 西南石油大学 一种利用溶胶-凝胶法制备铁铝酸四钙的工艺

Also Published As

Publication number Publication date
HU0400630D0 (en) 2004-05-28
HUP0400630A2 (en) 2006-01-30

Similar Documents

Publication Publication Date Title
AU579275B2 (en) Magnesium calcium oxide composite
US4139369A (en) Desulphurization of an iron melt
US4209325A (en) Desulphuration of metals
US5873924A (en) Desulfurizing mix and method for desulfurizing molten iron
WO1998045484A9 (fr) Melange de desulfuration et procede de desulfuration de fonte en fusion
JP2956022B2 (ja) 金属溶融物の処理剤、および金属溶融物を均質化、精錬、冷却および合金する方法
US4279643A (en) Magnesium bearing compositions for and method of steel desulfurization
AU605049B2 (en) Solid steel product
JP2007302961A (ja) 含Ｃｒ溶銑の脱硫精錬剤および脱硫方法
WO2005090614A1 (fr) Nouveaux agents de desulfuration permettant de diminuer la teneur en soufre de coulees de fonte a un niveau ultra bas
US9187792B2 (en) Agent for treating molten metals, method for the production and use thereof
US5037609A (en) Material for refining steel of multi-purpose application
RU2102495C1 (ru) Металлотермическая реакционная смесь
US4786322A (en) Magnesium and calcium composite
CN1206373C (zh) 用硝酸钙使炼钢渣起泡的方法及硝酸钙的这种应用
SU1693081A1 (ru) Способ производства электротехнической стали
JP2689837B2 (ja) 黒鉛球状化処理合金
SU1239162A1 (ru) Модифицирующа смесь
RU2234539C2 (ru) Проволока для присадки магния в расплавы на основе железа
RU2073735C1 (ru) Способ получения сплавов металлов с фосфором
RU2009207C1 (ru) Композиционный шихтовый материал для производства высококачественной стали
JPH10317035A (ja) 鉄系溶融合金の脱硫方法および脱硫剤
JP2020105571A (ja) スラグのフォーミング抑制方法および転炉精錬方法
HU194947B (en) Desulphurizing alloy containing magnesium foriron r iron-base melts
JPS58167712A (ja) 溶鋼の脱硫方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 69(1) EPC

122 Ep: pct application non-entry in european phase

Ref document number: 05718162

Country of ref document: EP

Kind code of ref document: A1