In situ observation of the direct and indirect dissolution ...

The dissolution of magnesia particles in synthetic CaO–Al 2 O 3 –SiO 2 (CAS)-based slags with and without MgO addition was investigated in situ with a confocal scanning laser microscope (CSLM) at 1500 and 1600 °C. The dissolution process was recorded. The effects of slag composition and temperature on the dissolution process and the time dependency of the MgO particle size during ...

Dissolution of dolomite and doloma in silicate slag -

Dolomite dissolution is believedto give a basic slag for the removal of oxidation productsto be retarded since the evolution of CO 2 gas initiallyand sulphur. Dolomite and doloma enhance the dissolutionprevents direct contact and reaction between the slag andof lime into the molten slag by forming an early basic slaglime/periclase in the ...

Effect of CO2 Content in Quicklime on Dissolution Rate of ...

In steelmaking processes, a CaO-based slag is used to remove impurities from steel. Various solid oxides, such as quicklime and dolomite, are used for producing the slag. The dissolution rates of these oxides in the molten slag play an important role for increasing the reaction rate between the steel and slag, decreasing the amount of flux ...

Study on the dissolution of lime and dolomite in converter ...

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.

DISSOLUTION KINETICS OF MGO-CAO AND MGO-CR2O3 …

content in the slag, the corrosion of the periclase phase in Mag-Chrome refractories will decrease. If C m = 0, then the value of (C s – C m) reaches a maximum and thus, so does the dissolution rate. Dissolution kinetics of MgO-CaO and Magnesitechrome refractories in secondary steel slag -

Kinetics of Flux Dissolution in Oxygen Steelmaking | M ...

Input Data decarburization reaction, Ts is temperature of slag (K), Ms The dissolution rate of lime and dolomite is predicted as is weight of slag (kg), h is height of slag (m), Pa is the am- a function of stirring intensity, physicochemical properties bient pressure of the system (Pa).

Dissolution of Dense Lime in Molten Slags under Static ...

is influenced strongly by temperature and slag composition. Mechanisms of lime dissolution into slag under different conditions have been studied previously.1–9) Umakoshi et al.,2) studied the dissolution of a rotating burnt dolomite cylinder in Fe t O–CaO–SiO 2 slag as a func-tion of temperature (1350–1400°C) and rotational speed.

Activation of ground granulated blast furnace slag by ...

after acid dissolution with 1 mol/L HNO 3 by inductively coupled plasma optical emission spectroscopy (ICP-OES, Perkin Elmar 7000) in triplicate, are also shown in Table 1. The Ca to Mg molar ratio of the dolomite is 1.07. For calcination, approximately 50 g of raw dolomite was placed

Mineral precipitation and dissolution at two slag-disposal ...

Mineral precipitation and dissolution at two slag-disposal sites in northwestern Indiana, USA E. R. Bayless Æ M. S. Schulz Abstract 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.

Study on the dissolution of lime and dolomite in converter ...

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Limestone dissolution and decomposition in steelmaking slag

Owing to high-activity lime product and CO2 from limestone decomposition, the dissolution rate of limestone is greater than that of lime under the same conditions in slag, and the calculated activation energy of limestone dissolution is 226.8 kJ mol−1.

Dissolution mechanism of dolomite in converter slag at ...

Dolomite is a natural mineral with a main chemical composition of CaMg(CO 3) 2. Both dolomite and doloma (the product of dolomite after calcinations, mainly containing CaO and MgO) are employed as slag additives in primary steel making process. All the dissolution experiments were carried out below ...

Role of Slag in Converter Steelmaking | ispatguru.com

Role of Slag in Converter Steelmaking. The oxygen converter process is the primary steelmaking process for the production of carbon and low-alloy steels. The process is essentially an oxidizing process of refining of the high carbon hot metal (HM) to low carbon liquid steel. The oxidizing process is carried out by blowing oxygen in the converter.

(PDF) Kinetics of Flux Dissolution in Oxygen Steelmaking

A mathematical model has been developed to predict the dissolution rate of added fluxes such as lime and dolomite as a sub-model of an overall kinetic model of top-blown oxygen steelmaking process.

Dissolution mechanism of dolomite in converter slag at ...

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.

Dissolution of dolomite and doloma in silicate slag

Dolomite and doloma enhance the dissolution gas initially of lime into the molten slag by forming an early basic slag prevents direct contact and reaction between the slag and lime/periclase in the resulting doloma and both CO

Quality of Lime for Steelmaking in Converter | ispatguru.com

Quality of Lime for Steelmaking in Converter. ... careful selection of the lime quality is important to improve its dissolution in the slag and to cope up with the speed of reactions. ... The CaO of calcined lime and CaO + MgO of calcined dolomite react with the oxidized impurities and iron oxide to form a slag. The slag is thus composed of ...

Dissolution of Magnesite and Dolomite in Simulated EAF Slags

from the slag which will make the slag highly viscous. This may explain why the slag could not fill the pores in the porous layer at the particle/slag interface in the case of dolomite. High dissolution.

How Calumite Slag Works

The use of Calumite Slag provides between 15% and 40% of the CaO in the new glass from the batch. As the Calumite Slag is glassy and, therefore, liquid at glass melting temperatures, it is available to take part in the batch reactions at lower temperatures than the decomposition of limestone and dolomite.

Refractory Lining | Steel Industry | Jobs: Dissolution ...

Naturally, to minimize rate of dissolution, it is necessary to minimize (C s – C m). For example, with increasing MgO content in the slag, the corrosion of the periclase phase in Mag-Chrome refractories will decrease. If C m = 0, then the value of (C s – C m) reaches a maximum and thus, so does the dissolution rate.

Additon Of Dolomite In Slag - cz-eu.eu

Slag is the glass-like by-product left over after a desired . It was also ground into powder to add to glazes for use in . limestone and/or dolomite are . Get Price And Support Online; Dissolution mechanism of dolomite in converter slag at . While addition of small amounts of dolomite directly . Dissolution mechanism of dolomite in converter slag .

7 Soil chemistry - Springer

7 Soil chemistry S. AUGUSTIN, M. MINDRUP and KJ. MElWES ... content in dolomite. The formula for slag lime from Table 7.2.2-1 characterizes the ... dissolution of dolomite and of enstatite, as an example of a magnesium-rich mineral in basalt powder. From pK2 and pK3, it can be seen that the dissolution reaction of ...

Study on lime dissolution in converter slag

The dissolution of lime and dolomite into different slag systems has been the topic of many researchers [1]-[9]. Russell [1] studied lime reactivity as well as dissolution rates and reported that the dissolution of lime could be determined at room temperature by ASTM water reactivity test.

Dissolution of Magnesite and Dolomite in Simulated EAF ...

Dissolution of Magnesite and Dolomite in Simulated EAF Slags. Uploaded by Agustine Setiawan. Steelmaking. Save . Dissolution of Magnesite and Dolomite in Simulate... For Later. save. Related. Info.

Comparative Analysis of Dolomitic Lime and Chinese ...

3. Slag characteristics required for foamy slag in the EAF: 1, 2,4,13,15 • Slag chemistry as determined by the basicity ratio is required to retain CO gas bubbles. Sufficient FeO is required to react with carbon to produce bubbles. • If slag viscosity is too thin, bubbles cannot be retained. (Watery)

Study on the dissolution of lime and dolomite in converter ...

In the present study, the dissolution mechanism and rate of lime, limestone and dolomite in converter slag was studied. 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.

dolomite mineral ca - shaheenpublicschool.com

Dolomite The mineral dolomite information and pictures. Dolomite is used to describe both a mineral and a rock. The mineral is the pure form with a defined crystal structure and chemical formula, whereas dolomite rock is composed chiefly of the mineral Dolomite, but also contains impurities such as Calcite, Quartz, and feldspar.