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Jan 01, 2020 The dissolution reaction of dolomite mineral ideally represented as CaMgCO 3 2 in an alkaline aqueous environment e.g., take the NaOH solution as the approximate pore solution composition in AAS binder can be written as , , 1 CaMgCO 3 2 2NaOHNa 2 CO 3 CaCO 3 MgOH 2
The mechanism of dolomite dissolution in converter slag was studied and found to proceed by two steps decomposition of dolomite into CaO and MgO and dissolution of the product into the slag. The first step was found to be controlled by heat transfer, which was confirmed by theoretical calculation.
The mechanism of dolomite dissolution in converter slag was studied and found to proceed by two steps decomposition of dolomite into CaO and MgO and dissolution of
Jul 18, 2013 Abstract. Dissolution mechanisms of dolomite CaMg CO 3 2, and doloma CaO.MgO, in a model basic oxygen furnace BOF slag based on the CaOMgOSiO 2 FeOMnO system have been characterised with regard to the reaction product phases at the dolomiteslag and dolomaslag interfaces by post-mortem microstructural analysis.
Dec 08, 2013 Formation of slag. Fluxes lime and calcined dolomite that are charged early in the blow dissolve with the developing oxides to form a liquid slag. The rate of dissolution of these fluxes strongly affects the slag metal reactions occuring during the blow.
Slag is a ubiquitous byproduct of the iron- and steel-refining industries. In northwestern Indiana and northeastern Illinois, slag has been deposited over more than 52 km2 of land surface. Despite the widespread use of slag for fill and construction purposes, little is known about its chemical effects on the environment. Two slagdisposal sites were examined in northwestern Indiana where slag ...
Jul 17, 2019 Rich MgO dolomite bricks are used between the slag line and the steel line to reduce wear in this area. One advantage of the dolomite brick for ladle is the reaction capacity with molten steel.
A slag composition containing from about 85 to about 99 weight percent of steelmaking slag and from about 1 to about 15 weight percent of a foaming additive. The steelmaking slag is at a temperature of from about 2500 to about 3100 degrees Fahrenheit. The foaming additive contains from about 20 to about 80 weight percent of a source of elemental carbon, from about 5 to
The dissolution rate of chromite into a slag was found to be temperature dependent and controlled by the compositions of both the chromite ore and the slag. The dissolution rate increased with increasing basicity ratio of the slag, as well as with increasing Al2O3 and decreasing SiO2. An increase in the MgO content became more
May 08, 2013 Basically limestone is used as a slag former, while dolomite is used as a slag former, slag modifier and as a refractory material. The process of iron making is the reduction of iron ore to produce iron. Iron ore normally contain gangue materials such asSiO2, Al2O3 along with S and P. Removal of these impurities is done by combining the gangue ...
Through thermal simulation experiment and SEM analysis, limestone dissolution in a steelmaking slag was studied. The results showed that the dissolution rate of limestone is 5.4 times greater than lime under the same conditions in slag, the dissolution rate of limestone in slag increases rapidly with the increase of stirring gas flux. The rapid dissolution of limestone in the slag
Aug 26, 2003 Slag is a ubiquitous byproduct of the iron- and steel-refining industries. In northwestern Indiana and northeastern Illinois, slag has been deposited over more than 52 km2 of land surface. Despite the widespread use of slag for fill and construction purposes, little is known about its chemical effects on the environment. Two slag-disposal sites were examined in northwestern Indiana where slag ...
of lime dissolution into slag1-8. Umakoshi, Mori and Kawai9 studied the solution of a rotating burnt dolomite cylinder in Fe tO-CaO-SiO 2 slag as a function of temperature 1350 C1400 C and rotational speed. From their analysis, they found that a film of Ca 2SiO 4 formed at a short distance from the CaO interface and hinder the ...
In the steelmaking process, various solid oxides such as lime and dolomite are used as flux. It is well known that the dissolution rate of these oxides into the molten slag has an important role to increase the reaction rate between the steel and slag. Although CaO effectively removes phosphorus from iron, undissolved CaO remains in the slag.
Nov 01, 2015 During the operation of a basic oxygen furnace BOF, slag that contains a high percentage of MgO is formed by the addition of dolomite to decrease the dissolution rate of the refractory. Nevertheless, the refractory has a limited lifespan because dissolution of MgO from the dolomite and refractory occur competitively.
Slag is a by-product of steel manufacturing and a ubiquitous fill material in northwestern Indiana. Ground water associated with slag deposits generally is characterized by high pH and elevated concentrations of many inorganic water-quality constituents. The U.S. Geological Survey, in cooperation with the Indiana Department of Environmental Management, conducted a study in
Dec 03, 2013 Dolomite is also a sedimentary rock type. When dolomite is formed, several steps of dissolution and re-precipitation is passed where the structure of the mineral is modified into more stable forms and crystallizes in a trigonal-rhombohedral manner.
Aug 01, 2015 The most important mechanism is the dissolution of lining into the slag. Rapid slag formation in order to bind and neutralize acidic SiO2 forming in the blow beginning, is a key point. Highly oxidizing hot slag dissolves magnesia or dolomite lining readily. Use of calcined dolomite can greatly improve the lining life.
Slag by Definition, Purpose and Chemistry. The American Welding Society AWS defines slag as a nonmetallic byproduct of the mutual dissolution of flux with nonmetallic impurities in welding and brazing processes. In short, its the hardened layer left on the top of the weld made during flux-cored welding FCAW.
Limestone and dolomite decompose at 800-900 C, through an endothermic reaction releasing CO 2 and CaO and MgO that react and form part of the melt. However, it is known that limestone and CaO are poorly wetted by the primary melt. The use of Calumite Slag provides between 15 and 40 of the CaO in the new glass from the batch.
Modeling of lime and dolomite dissolution was developed as a function of temperature, slag composition and stirring intensity as proposed by Dogan et al. 156 The rate of lime dissolution is ...
2.2. Dissolution Mechanism of Dolomite MgO has a tendency to form a solid product with FeO in steelmaking slags with a low melting point.10 When dolomite dissolves in slag, slag penetrates to the dolomite through the pores of the dolomite particles. CaO and MgO diffuse out of the dolomite due to the concentration differ-ence.
Lime dissolution in stagnant slag was studied first and dissolution of lime, limestone and dolomite under forced convection were carried out by new experimental setup. Dissolution of different CaO samples into stagnant converter slags was carried out in a closed tube furnace at 1873K. In the case of CaO-FeO-SiO2 slag, the dissolution of ...
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