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WO2024136793A1 - Conditionneur de scorie comprenant la scorie obtenue à partir de fours à ferrochrome en tant que composant - Google Patents

Conditionneur de scorie comprenant la scorie obtenue à partir de fours à ferrochrome en tant que composant Download PDF

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Publication number
WO2024136793A1
WO2024136793A1 PCT/TR2023/051204 TR2023051204W WO2024136793A1 WO 2024136793 A1 WO2024136793 A1 WO 2024136793A1 TR 2023051204 W TR2023051204 W TR 2023051204W WO 2024136793 A1 WO2024136793 A1 WO 2024136793A1
Authority
WO
WIPO (PCT)
Prior art keywords
slag
ferrochrome
furnaces
conditioner
component
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/TR2023/051204
Other languages
English (en)
Inventor
Gokhan BASMAN
Tugce OZCAN
Hande ARDICOGLU
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.)
Eti Krom AS
Original Assignee
Eti Krom AS
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
Priority claimed from TR2022/019839 external-priority patent/TR2022019839A2/tr
Application filed by Eti Krom AS filed Critical Eti Krom AS
Priority to EP23907986.6A priority Critical patent/EP4638808A1/fr
Publication of WO2024136793A1 publication Critical patent/WO2024136793A1/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
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/54—Processes yielding slags of special composition
    • 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
    • C21C7/076—Use of slags or fluxes as treating agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2200/00—Recycling of non-gaseous waste material
    • 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
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings

Definitions

  • the invention relates to a slag conditioner comprising the slag obtained from the ferrochrome furnaces as a component and thus enabling the production of the products with low costs and high added value.
  • Ferrochrome is a metal compound generally used in the production of the stainless and heat-resistant steel.
  • the ferrochrome and silicoferrochrome slag are one of the materials resulting from the processes in the electric-arc furnaces of the ferrochrome production facilities.
  • the unreduced oxides and a part of SiOs form a slag layer on the metal surface, and this slag is removed by pouring into the molds. It is known that said slags are used as the raw materials in the applications of the base and sub-base material, earth embankment, filling, main road shoulders and hot asphalt mixtures.
  • the slag conditioners are generally used as the auxiliary components to obtain the technical properties expected from the slags in the production of the metals.
  • Said “slag conditioners” have the functions of reducing the viscosity of the slag, absorbing phosphorus and sulphur and removing them from the molten metal, increasing the basicity of the slag, maintaining and regulating its fluidity, reducing the fuel consumption, ensuring less slag formation, forming less dust loss, and regulating the gas permeability of the charging material.
  • By adding the slag conditioners it is possible to carry out the process at lower costs and with higher efficiency.
  • the acidic components such as SiOs
  • limestone is used as the flux materials in the production of the raw iron in the blast furnace in order to remove both silica and phosphorus into the slag.
  • Limestone is a basic flux and dolomite (MgCO3.CaCO3) is an example of other basic fluxes.
  • An example of the acidic fluxes is silica (SiOs). This flux material is generally used in the steel production.
  • Alumina (AI2O3) is also rarely used as a flux material. It can act as acidic or basic depending on the conditions.
  • the slag conditioners are expected to comprise the high amounts of magnesium and silicon oxide compounds.
  • the olivine minerals are mostly used as the slag conditioners that provide this and have relatively low costs.
  • the slag conditioners that were widely used in the past have been replaced by the mineral olivine due to their harmful effects on the human health and environment.
  • the olivine minerals have relatively high costs, causing the costs to increase in further processes.
  • the invention is related to the use of the slags obtained from the ferrochrome furnaces as the slag conditioners for the storage and disposal of the slags that are harmful to the environment.
  • An aspect of the invention relates to the use of the relatively worthless slag obtained from the ferrochrome furnaces as a component in the slag conditioner production with higher added value and lower costs.
  • An object of the invention is to create a new market by creating added value for the inert slag obtained from the ferrochrome furnaces.
  • Another object of the invention is to provide a slag conditioner that increases the melting temperature with a high amount of MgO, which allows the slag to adhere to the refractory surface and prolongs the refractory life.
  • Another important object of the invention is to reduce the stock amount of the slag obtained from the ferrochrome furnaces and to prevent the storage problems that may occur in the future.
  • the invention relates to a slag conditioner comprising the slag obtained from the ferrochrome furnaces as a component and thus enabling the production of the products with low costs and high added value, and is described only with the examples that will not create any limiting effect for a better understanding of the subject.
  • ferrochrome refers to the alloys consisting of chromium and iron and containing small amounts of elements such as carbon and silicon.
  • the ferrochrome known in the art is divided into three groups as “high, medium and low carbon ferrochrome” depending on the amount of carbon therein.
  • high carbon ferrochrome is the most common alloy comprising 60% to 70% by weight or by mass of chromium and 4% to 6% by weight or by mass of carbon.
  • the “slag conditioners” are the compositions that have the functions of reducing the viscosity of the slag, absorbing phosphorus and sulphur and removing them from the molten metal, increasing the basicity of the slag, maintaining and regulating its fluidity, reducing the fuel consumption, ensuring less slag formation, forming less dust loss, and regulating the gas permeability of the charging material.
  • the ores such as dolomite and olivine are used as the slag conditioners. These and similar ores comprise high percentages of CaO, MgO, SiOs and/or AI2O3 compounds by weight. It is expected that the slag conditioners to be used instead of these ores known in the art will have at least a similar chemical composition. In particular, the slag conditioners are expected to have high amounts of MgO, AI2O3 and SiO2. Limestone (CaCO3) and dolomite (MgCO3.CaCO3) are used as the flux materials in the production of the raw iron in the blast furnace in order to remove both silica and phosphorus in the metal into the slag.
  • Limestone CaCO3
  • dolomite MgCO3.CaCO3
  • the present inventors propose the use of the slags obtained from the ferrochrome furnaces as the slag conditioners at lower costs for the relevant technical field. It has been determined that the slags obtained from said ferrochrome furnaces comprise high amounts of Mg and Si oxides as the components. Accordingly, the slags obtained from the ferrochrome furnaces suitable for use as the slag conditioners comprise at least 30% by weight of MgO and at least 20% by weight of SiO2 compounds.
  • the slags obtained from the ferrochrome furnaces according to the invention preferably comprise a chemical composition as in Table 1 .
  • the slag obtained from the ferrochrome furnaces according to the invention comprises MgO and SiO2 compounds in high weight ratios.
  • the slag obtained from the ferrochrome furnaces absorbs the high amount of MgO compound therein and the sulfur and phosphorus in the metal, removes them from the metal and allows them to pass into the slag and changes the characteristics depending on the conditions with the AI2O3 ratio.
  • the MgO ratio increases the melting temperature of the slag, increasing the adhesion of the slag to the refractory surface and creating a protective layer on the refractory surface.
  • the slags obtained from the ferrochrome furnaces according to the invention do not undergo any sizing treatment or pre-treatment in order to be used as a slag conditioner and can be used directly. In this respect, it is advantageous in terms of cost.
  • the chemical content of the slag obtained from the ferrochrome furnaces according to the invention is similar to the chemical content of dolomite used as flux in the iron and steel industry, and at the same time, it has a refractory protection feature compared to the flux materials known in the art, due to the high MgO content therein. In addition, since it is an inert product, it is more cost-effective than the fluxes used in the market.
  • the slag obtained from the ferrochrome furnaces has better results than the fluxes used in the industry in terms of the slag conditioner and refractory protection properties.

Landscapes

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

Abstract

L'invention concerne un conditionneur de scorie comprenant la scorie obtenue à partir des fours à ferrochrome en tant que composant et permettant ainsi la production des produits à faibles coûts et avec une valeur ajoutée élevée.
PCT/TR2023/051204 2022-12-20 2023-10-26 Conditionneur de scorie comprenant la scorie obtenue à partir de fours à ferrochrome en tant que composant Ceased WO2024136793A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23907986.6A EP4638808A1 (fr) 2022-12-20 2023-10-26 Conditionneur de scorie comprenant la scorie obtenue à partir de fours à ferrochrome en tant que composant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2022/019839 TR2022019839A2 (tr) 2022-12-20 Ferrokrom firinlarindan elde edi̇len cüruflarini bi̇leşen olarak bi̇r cüruf düzenleyi̇ci̇
TR2022019839 2022-12-20

Publications (1)

Publication Number Publication Date
WO2024136793A1 true WO2024136793A1 (fr) 2024-06-27

Family

ID=91589769

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2023/051204 Ceased WO2024136793A1 (fr) 2022-12-20 2023-10-26 Conditionneur de scorie comprenant la scorie obtenue à partir de fours à ferrochrome en tant que composant

Country Status (2)

Country Link
EP (1) EP4638808A1 (fr)
WO (1) WO2024136793A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB747496A (en) * 1953-03-12 1956-04-04 Marvin J Udy Improvements in ferrochromium recovery
US3396010A (en) * 1965-09-16 1968-08-06 Northwest Olivine Company Slag conditioner
US20060105901A1 (en) * 2004-11-17 2006-05-18 Stein Joseph L Slag conditioner composition, process for manufacture and method of use in steel production

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB747496A (en) * 1953-03-12 1956-04-04 Marvin J Udy Improvements in ferrochromium recovery
US3396010A (en) * 1965-09-16 1968-08-06 Northwest Olivine Company Slag conditioner
US20060105901A1 (en) * 2004-11-17 2006-05-18 Stein Joseph L Slag conditioner composition, process for manufacture and method of use in steel production

Also Published As

Publication number Publication date
EP4638808A1 (fr) 2025-10-29

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