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 …
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 …
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 ...
scale of steel formed through secondary route is alloy steel and plain carbon steel. [2] In the present work, our objective is to set up preliminary info for dephosphorization of steel in 150 kg induction furnace. As for the expulsion of phosphorous basic environment is desirable,
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)] …
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 ...
Jan 05, 2012· Dephosphorization pretreatment or decarburization and heating are completed in one converter. 1. The metal-slag is completely separated after the dephosphorization pretreatment, which is helpful for producing ultralow [P] steel. 2. The high temperature decarburization slags can be directly used in dephosphorization.
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.
Pathways to decarbonisation episode two: steelmaking technology. This episode is the second in our pathways to decarbonisation series. It is also the first of two articles on the global steel sector. Here, we focus on the technology options the steel industry has at its …
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.
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 ratio and material consumption.
The invention provides a slag forming agent for dephosphorization of medium-high-phosphorus semisteel and a preparation method of the slag forming agent. The slag forming agent comprises chemical components in percentage by mass as follows: 20-35% of CaO, 5-10% of MgO, at least 10% of FeO, 4-10% of Al2O3 and 10-20% of SiO2. The slag forming agent for the dephosphorization of the …
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].
Dolomite is a type of limestone. It is rich in magnesium and calcium carbonate. It also has smaller amounts of several other minerals. People take dolomite as a calcium and magnesium supplement.
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.
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 ...
The invention provides a composition for slag formation, which comprises the following components based on the total weight of the composition: 45-65wt% of CaO, 10-20wt% of SiO2, 1-5wt% of MnO, 9-25wt% of MgO and 1.5-5wt% of Al2O3. The invention also provides a preparation method and a use method of the composition. The composition for slag formation provided by the invention can promote ...
Jul 30, 2016· Use of synthetic slag can desulphurize steel up to 50 % to 60 % of the original sulphur level in the steel. The desirable properties of the synthetic slag are (i) slag is to have high sulphide capacity, (ii) it is to be basic in nature, (iii) it is to be fluid to obtain faster reaction rates, and (iv) it is not to cause excessive refractory wear.
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.
A kind of method of converter gasification dephosphorized slag circulation dephosphorization steel-making, the first stage slag splashing gasification dephosphorization of this method: second stage iron making charging: inclination converter is blended into steel scrap and molten iron improves converter scrap ratio, rear converter drop rifle oxygen blast, head batch slag material is added ...
steel - steel - Basic oxygen steelmaking: More than half the world's steel is produced in the basic oxygen process (BOP), which uses pure oxygen to convert a charge of liquid blast-furnace iron and scrap into steel. The basic oxygen furnace (BOF) is a refractory-lined, tiltable converter into which a vertically movable, water-cooled lance is inserted to blow oxygen through nozzles at ...
Aug 01, 2015· For the dephosphorization slag plays an important role in the oxygen converter steelmaking. The balance of oxygen activity in the steel and slag can be related in the oxidation phase as well as materials being used for dephosphorization. The equation of removing phosphorous from the steel is in simple terms is as follows.
Limestone & Dolomite Its use in furnaces in different countries and continents, allows the refining and manufacture of steel, as well as protecting the refractory lining of furnaces and converters. Calcinor also has specific products for this sector, for example REFRA DOL ®, designed for use in refractory gunning applications as it is a ...
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.
The lime consumption per ton steel decreased by 42.4%, the dolomite consumption per ton steel decreased by 12%. the limestone consumption per ton steel increased by 34.3% and the cost of steel ...
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, ...
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
83 Feb., 1 8 8 0 . ] Dephosphorization of Iron. DEPHOSPHORIZATION OF IRON. By F. GAvTI~.a. A paper read before the Society of Civil Engineers of Paris, July 4th, 1879. Translated by CItAS. E. t~ILLIN. Dephosphor/zat/on is a problem of great importance in metallurgy. In the proportion of one per cent. phosphorus renders iron easily fusi- ble, a ...