Jun 02, 2017· Basic oxygen furnace slag (BOF slag) is an unavoidable by-product of steelmaking process of basic oxygen furnace. The main chemical constituents of BOF slag are CaO, FeO, Al 2 O 3, SiO 2 and MgO. Due to its high metallic value (FeO: 16-20%) and lime content (CaO: 45-50%), it is possible to use in iron making and steelmaking process to replace lime and recover iron and CaO.
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About us We supply high quality calcined dolomite, which mainly used as deoxidization, dephosphorization of molten steel as well as desulfurization during the process of steel making.
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Notes. Dolomite as a ceramic material is a uniform calcium magnesium carbonate. In ceramic glazes it is used as a source of magnesia and calcia. Other than talc, dolomite is the principle source of MgO in high temperature raw glazes. 'Dolomite matte' stoneware glazes, for example, are highly prized for their pleasant 'silky' surface texture. Dolomite by itself is refractory, but when combined ...
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Mar 23, 2021· The proper process parameter of dephosphorization is a key problem in actual steelmaking production. This article presents a rule set model combining a k‐means method and a decision tree model, which can extract the rule set from the actual production data to optimize the dephosphorization process.
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Oct 26, 2011· Steel slag is a byproduct of the steelmaking and steel refining processes. This paper provides an overview of the different types of steel slag that are generated from basic-oxygen-furnace (BOF) steelmaking, electric-arc-furnace (EAF) steelmaking, and ladle-furnace steel refining processes. The mineralogical and morphological properties of BOF and electric-arc-furnace-ladle [EAF(L)] …
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May 01, 2009· The use of double converters is associated with considerable high cost. Phosphorus can also be removed from steel after converter processing to obtain the ultra-low phosBiography:TIAN Zhi-hong(l979-), , Doctor; phorus steel[7-11). However, the dephosphorization treatment must be carried out before deoxidation and alloying.
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Aug 01, 2018· The double-slag converter steelmaking process can smelt low- and ultra-low-phosphorus steel and reduce lime and dolomite consumption and the amount of final slag simultaneously. Industrial steelmaking tests on a 150-metric ton converter at the Tangsteel Company were carried out to study this principle and its effect on the dephosphorization …
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Dephosphorization reaction is the slag steel interface re-action, and the catalytic effect of the early slag making pro- ... amount of dolomite) was added after the start of the smel-ting process, while the remaining lime and other slag ma-terials were added after blowing for 8 min.
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The operating parameters which affect dephosphorization of steel include temperature, basicity of slag, ferrous oxide activity or iron content of slag, activity, silica content of the slag, slag volume, the following operating parameters are desirable for dephosphorization of steel: ... The fluxes may include lime and dolomite in burnt or ...
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Apr 01, 2016· Keywords: dephosphorization, temperature of the first deslagging, thermodynamic analysis, slag composition Introduction High phosphorus content in final steel products usually cause embrittlement largely induced by the segregation of phosphorus at grain boundaries [1], and low ductility, poor mechanical and welding performances [2].
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Mar 23, 2021· The proper process parameter of dephosphorization is a key problem in actual steelmaking production. This paper presents a rule set model combining k‐means method and decision tree model, which can extract the rule set from the actual production data to optimize the dephosphorization process.
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electric furnace, EBT, steel, phosphor content, dephosphorization process. 1. INTRODUCTION . The reduction content of phosphor content from steel it was and will remain a concern of steel makers, indifferent of steel processing method. In Romanian steel industry are operating four main producers of
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Test data on the use of Ca-CaF2 and CaC2-CaF2 fluxes are shown, and the importance ofthe post-treatmentof spent fluxes is pointed out for environmental reasons. Any dephosphorization step must satisfy the requirements of present processes For the production of stainless steel in terms of the carbon and chromium contents. The
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Jun 06, 2018· After high efficiency dephosphorization, about 60% slag is poured out, then smelting in the decarburization stage continues, and the steel residue remains and enters the next furnace cycle; as the slag is reused, the consumption of lime and dolomite and slag discharge are greatly reduced.
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Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical composition of CaMg (CO 3) 2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Limestone that contains some dolomite is known as dolomitic limestone.
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Dephosphorization of molten carbon saturated iron with CaO-FeCl 2 flux was investigated in a laboratory scale test. By using CaO-FeCl 2 flux of 100 kg/t, 90% dephosphorization is possible together with desulphurization of 8090% when the molten carbon saturated iron has silicon, manganese and chromium content less than 0.05%, respectively. In a graphite crucible test, dephosphorization of …
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May 07, 2012· Blowing slag generated in the two left in the furnace for use early next furnace steel dephosphorization. Changes in the process of blowing molten pool of metal components shown in Figure 2. Spray lime powder and steel-making method of a typical furnace slag down and blowing the finish line of metal and slag composition in Table 1 and Table 2.
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Dololime is mainly produced through the heating of Dolomite rocks. The process may entail some selected special sizes that undergo high temperature ranging between 900°C & 1100°C in specialized Kilns. Ca, Mg (C03)2 + HEAT → CaO, MgO + CO2. In this process, Calcium Carbonate and Magnesium Carbonate will get disintegrated, and then turned ...
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The slag is convenient for the dephosphorization of the next furnace, and the slag can be reused, which can reduce the amount and consumption of raw materials such as dolomite and lime. Since the final process has a small amount of slag and no slag dumping, it can improve the yield of molten steel and oxygen. Utilization rate.
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A steelmaking technique, wherein the desiliconization and dephosphorization take place in the molten pig iron stage, and wherein in the molten steel stage not only the removal of non-metallic inclusions but also the refining occur simultaneously, is believed to be more efficient than the prior art techniques.
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Feb 25, 2019· AbstractTo achieve reuse of converter slag, the influence of the P2O5 content on the component activity of dephosphorization slag, the basicity of the slag, and the phosphorus content in liquid steel were studied and the influence of temperature on the end phosphorus content in liquid steel was analyzed. The results show that the slag remaining in the last heat still exhibited strong ...
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use of dolomite on dephosphorization steel – Grinding Mill China. Jun 26, 1984 · (ii) The pig iron dephosphorization, i.e., hot metal dephosphorization is a process in ... dephosphorization … raw materials ore, lump ore, ...
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Jul 17, 2019· 10%· Industrial experiments were carried out to investigate the effect of the direct charging of hot recycled slag (DCHRS) on hot metal pretreatment dephosphorization in a dephosphorization furnace. The bulk compositions of semi-steel and slag show that a better dephosphorization effect could be achieved by applying the DCHRS process in the dephosphorization …
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After dephosphorization, the thus desiliconized and dephosphorized pig iron is charged into a converter and a sufficient amount of quicklime is added to the bath so as to suppress the re-phosphorization in the converter. The addition of another large amount of quicklime is also effective in furthering the dephosphorization during steel refining.
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Dolomite Walkers and Rollators are lightweight alternatives to standard folding walkers. Easy-to-use handbrakes, a seat for resting and a large capacity cargo basket provide safety and convenience. These are some of the nicest walkers available. Dolomite walkers are designed and carefully manufactured to be reliable and easy to maintain.
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process of making stainless steel, cheaper scrap metal with higher phosphorus content would lower the costs. Although there is no deliberate focus on dephosphorization in 's steel production, the dephosphorization process is taking place in the interface between the slag and the melt. [3].
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Oct 04, 2018· How Growth will Unfold. The mining & metallurgy sector would materially shape the global dolomite market, wherein, dolomite is used in the smelting of iron and steel. Procuring over 80% share of overall market stack, manufacturers cite this end-use sector as the immediate adopter of dolomite mineral. Going forward, dolomite will be increasingly ...
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2.2.2 Dephosphorization Kinetics During Post-Blow Stir The rate at which the steel is dephosphorized during the post-blow stirring with e.g. nitrogen or argon is controlled by where k c = mass transfer coefficient of P in molten steel A = cross sectional area at the slag-metal interface (m2) V = steel volume (m3) %P = P content in the steel at ...
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Steelmaking has played a crucial role in the development of ancient, medieval, and modern technological societies. Early processes of steel making were made during the classical era in Ancient Iran, Ancient China, India, and Rome.. Cast iron is a hard, brittle material that is difficult to work, whereas steel is malleable, relatively easily formed and a versatile material.
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The global dolomite powder market size was USD 25.41 billion in 2019 and is projected to reach USD 33.44 billion by 2027, exhibiting a CAGR of 3.8% during the forecast period. Dolomite powder is an anhydrous carbonate mineral which comprises calcium magnesium carbonate. This powder is used in applications such as steel-making, cement ...
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Jun 28, 2017· Dolomite is an anhydrous carbonate mineral. It is a double carbonate of calcium and magnesium (CaCO3.MgCO3). It is one of the important raw materials used in production of iron and steel. Dolomite contains theoretically 54.35 % of CaCO3 and 45.65 % of MgCO3 or 30.41 % of CaO, 21.86 % of MgO, and 47.73 % of CO2.
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Additionally, dephosphorization and desulfurization were improved by higher flux addition. Flexibility in raw materials, the lower natural gas prices, and the increased use of nonconventional Electric Arc Furnace (EAF) steelmaking using up to Direct Reduced Iron (DRI) have prompted a renewed interest in better control of phosphorus.
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The most professional mineral encyclopedia knowledge base, Collecting more than 500 mineral and Rock, datum and tens of thousands of minerals photos!
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dolomite uses in steel industries. Dolomite is used in iron and steel industry as refractory raw materials and a flux. The BIS (IS: 10346–1982) has prescribed following specifications of dolomite for use in the manufacture of refractory bricks, felting materials and for the blast furnace and sintering plants.Dolomite – Its Processing and Application in Iron and .Hence generally the rock ...
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May 17, 2008· Merallurgtsz, Vol 4I, ~ 7. I997 USE OF PITCH-DOLOMITE REFRACTORIES EN STEEL-POURING LADLES B. A. Chumaria, V. V. Chuikov, UDC 621.746.329 G. 1~. II'in, A. G. Gur'ev, and D. D. Kozlov In modern metaliurgicat production, steel-pouring ladies not only serve as vessels to receive molten metal from the steelmaking furnace, but are also used to treat the steel outside the furnace. …
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Jan 09, 2013· A basic and highly reactive slag is necessary to attain desulphurization and dephosphorization in LD steel making at the turndown stage. Hence the physical and chemical characteristics of the lime used are of utmost importance. ... First an inner layer of magnesite or burnt dolomite brick is made. Gaps between the brick and the shell are filled ...
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