Effect of Lime Dissolution Rate in Slag on Hot Metal Dephosphorization

The carburization of molten iron is close to saturation in the blast furnace process, while that in the flash ironmaking process is uncertain because there is no pressure from solid charge and no carburization reactions occurring between the deadman and hot metal. Some experiments were conducted to reveal the kinetic mechanism of coke dissolving in carbon-iron melts. Reduced iron powder, electrolytic iron as well as chemical pure graphite were used as experiment materials. With high-purity argon injected as the protective gas, the specimens were heated up to 1873 K in a tubular resistance furnace to study the isothermal mechanism. The results show that the composition of the ferrous sample affects the dissolution rate. When the FeO content of the iron-bearing material rises from 0% to 4.76%, the apparent dissolution rate constant, kt, falls from 7.98 × 10−6 m/s to 5.48 × 10−6 m/s. There are some differences amongst the dissolution rate coefficients of different cokes despite interacting with similar carbon-iron melts, with coke 1 of 7.98 × 10−6 m/s, coke 2 of 5.17 × 10−6 m/s, and coke 3 of 3.77 × 10−6 m/s. Besides, this index decreases with the increase of the dissolution time and solely depends on the procedure of the mass transfer. A negative correlation is demonstrated between kt and the sulfur content in the iron bath as well. The content of silicon dioxide in the coke has a significant influence on kt. Additionally, the dissolution rate coefficient increases with the increase of the graphitization degree of coke.

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Dissolution rate and stability study of flavanone aglycones, naringenin and hesperetin, by drug delivery systems based on polyvinylpyrrolidone (PVP) nanodispersions

Drug Development and Industrial Pharmacy ◽

10.1080/03639040903140589 ◽

2009 ◽

Vol 00 (00) ◽

pp. 090810023617078-10 ◽

Cited By ~ 2

Author(s):

F. I. Kanaze ◽

E. Kokkalou ◽

I. Niopas ◽

P. Barmpalexis ◽

E. Georgarakis ◽

...

Keyword(s):

Drug Delivery ◽

Dissolution Rate ◽

Drug Delivery Systems ◽

Delivery Systems ◽

Stability Study

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Increase of desulphurization potential of technological systems of hot metal injection desulphurization by various reagents

Ferrous Metallurgy Bulletin of Scientific Technical and Economic Information ◽

10.32339/0135-5910-2019-11-1237-1243 ◽

2019 ◽

Vol 75 (11) ◽

pp. 1237-1243

Author(s):

A. F. Shevchenko ◽

I. A. Manachin ◽

B. V. Dvoskin ◽

A. S. Vergun ◽

S. A. Shevchenko ◽

...

Keyword(s):

Technological Systems ◽

Hot Metal

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Review of methods of slag removal from melt surface in hot metal and steel ladles

Ferrous Metallurgy Bulletin of Scientific Technical and Economic Information ◽

10.32339/0135-5910-2020-12-1243-1252 ◽

2020 ◽

Vol 76 (12) ◽

pp. 1243-1252

Author(s):

B. A. Sivak ◽

A. V. Protasov ◽

L. A. Smirnov

Keyword(s):

Settling Tank ◽

Necessary Condition ◽

Hot Metal ◽

Slag Removal ◽

Production Scale ◽

Technical Parameters ◽

Ecological Requirements ◽

The Usa ◽

Work Done ◽

Technological Methods

The removal of slag from melt surface of hot metal and steel ladles is a necessary condition to provide a deep desulphurization and dephosphorization of hot metal and steel in the process of their processing. A review of methods of slag skimming presented, mainly based on slag mechanical shoveling and its removal out of ladles by vacuum sucking. It was shown, that manipulators design for the slag skimming working instrument moving depends on the production scale, mass of the processed heats, amount and properties of the slag to be removed, production process intensity and ecological requirements. Peculiarities of designs and technical parameters of machines for slag skimming presented, designed by Irkutsk plant of heavy machinery, Scientific and Production Enterprise n.a. M.I. Platov, VNIIMETMASH, Kuznetsk and Novolipetsk steel plants. Technological methods of control of slag composition and physical properties considered, first of all of viscosity and fluidity, which have significant effect on selection of a method of slag skimming. Advantages and drawbacks of actions, aimed at more complete slag removal from metal surface by a scraper noted including bath blowing off by an inert gas, liquid slag tapping into am intermediate settling tank following its removal into a slag bowl. In case of satisfactory fluidity it is possible to slag removal by vacuum sucking, which at the same time promoted the melt degassing. Work done in this area abroad noted. Methods of vacuum slag removal developed in the USA and Japan described.

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Solubility Enhancement of Poorly Soluble Drug Simvastatin by Solid Dispersion Technique

Research in Pharmacy and Health Sciences ◽

10.32463/rphs.2016.v02i02.16 ◽

2016 ◽

Vol 2 (2) ◽

pp. 91-95

Author(s):

Neelima Rani T ◽

Pavani A ◽

Sobhita Rani P ◽

Srilakshmi N

Keyword(s):

Dissolution Rate ◽

Drug Carrier ◽

Solid Dispersions ◽

Aqueous Solubility ◽

Onset Of Action ◽

Kneading Method ◽

Wetting Property ◽

Poorly Soluble ◽

Dispersion Technique ◽

Low Solubility

This study aims to formulate solid dispersions (SDs) of Simvastatin (SIM) to improve the aqueous solubility, dissolution rate and to facilitate faster onset of action. Simvastatin is a BCS class II drug having low solubility & therefore low oral bioavailability. In the present study, SDs of simvastatin different drug-carrier ratios were prepared by kneading method. The results showed that simvastatin solubility & dissolution rate enhanced with polymer SSG in the ratio 1:7 due to increase in wetting property or possibly may be due to change in crystallinity of the drug.

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