Sinziana Ittu | Independent Researcher (original) (raw)
Papers by Sinziana Ittu
The characterization of iron ore particles is vital importance for the studies of the mineral com... more The characterization of iron ore particles is vital importance for the studies of the mineral composition. The specific surface area of iron ore particles can be measured by laser diffraction, and mathematical models (based on the size distribution). Particle size fractions and chemical composition were determined of several types of iron ore (symbolically marked A, B, C, D, E, F). These features have direct influence on the sintering process by particle size analysis, permeability, reducibility, porosity, CaO/SiO ratio, influence of MnO in sinter. The granulation experiment show that these minerals (more than 50% with diameters of <1mm) can be successfully used in the sintering process, or by alloying with other minerals in Europe. Large irregularly shaped and adhesive particles can get a higher efficiency of granulation easily. The usage of iron ore with big and rough particles can improve the permeability while the iron ore with smooth and sphere particles has poor ability of ...
The Annals of "Dunarea de Jos" University of Galati. Fascicle IX, Metallurgy and Materials Science, 2013
In the tundish, purification of steel is given by the use of an oxide powder on the steel surface... more In the tundish, purification of steel is given by the use of an oxide powder on the steel surface. This powder perform several important functions, such as thermal insulation, protection against liquid steel surface oxidation and capturing inclusions from the bath. This paper presents an experiment carried out with an acid powder based on thermal power plant ash to the casting of steel with carbon content from 0.30 to 0.33% and 1.00 - 1.15% manganese. Powder behavior during casting can be summarized as follows: rapid spreading of liquid steel surface, good thermal insulation, revealed by the gradient temperature from the slag. The average specific consumption recorded was very low, 0.4 kg/t liquid steel. It has been analyzed the chemical composition of the slag from the tundish during casting, to prelevate 6 consecutive samples taken during casting. The compositions of these slags were compared to the oxide powder composition initially given on the liquid steel. There was a good abs...
In the tundish, purification of the steel is given by utilisation of an oxide powder on the steel... more In the tundish, purification of the steel is given by utilisation of an oxide powder on the steel surface. This powder perform several important functions, such as thermal insulation, protection against liquid steel surface oxidation and capturing inclusions from the bath. This paper presents an experiment achievement with a acid powder based on thermal power plant ash to the casting of steel with carbon content from 0.30 to 0.33% and 1.00 - 1.15% manganese. Powder behavior during casting can be summarized as follows: rapid spreading of liquid steel surface, good thermal insulation, revealed by the gradient temperature from the slag. The average specific consumption recorded was very low, 0.4 kg / t liquid steel. It has been analyzed the chemical composition of the slag from the tundish during casting, to prelevate 6 consecutive samples taken during the sequence of the casting. The compositions of these slags were compared with the oxide powder composition initially given on the liqueed steel. There was a good absorption of inclusions, as evidenced by last composition of analyzed slag sample. There was a strong increase of MnO content and changes in values of the other oxide compounds, such as SiO2. The paper highlights the experimental slag capacity, a hard acid slag based on thermal power plant ash, to capture the MnO type inclusions, up to 38%. This process can be interpreted as negative, meaning that the acid slag is absorbed from the steel alloying element, manganese.
The native vermiculite deposit in Orsova area was used in casting powder technologies and experim... more The native vermiculite deposit in Orsova area was used in casting powder technologies and experimental tests were performed in the laboratory but also in steelwork. Physical and chemical characteristics of experimental tundish powder created the assumption of good behavior. The powders based on raw vermiculite ore had an effective good behavior at the industrial testing, meaning that they had good thermal insulation and a low specific consumption.
The characterization of iron ore particles is vital importance for the studies of the mineral com... more The characterization of iron ore particles is vital importance for the studies of the mineral composition. The specific surface area of iron ore particles can be measured by laser diffraction, and mathematical models (based on the size distribution). Particle size fractions and chemical composition were determined of several types of iron ore (symbolically marked A, B, C, D, E, F). These features have direct influence on the sintering process by particle size analysis, permeability, reducibility, porosity, CaO/SiO ratio, influence of MnO in sinter. The granulation experiment show that these minerals (more than 50% with diameters of <1mm) can be successfully used in the sintering process, or by alloying with other minerals in Europe. Large irregularly shaped and adhesive particles can get a higher efficiency of granulation easily. The usage of iron ore with big and rough particles can improve the permeability while the iron ore with smooth and sphere particles has poor ability of ...
The Annals of "Dunarea de Jos" University of Galati. Fascicle IX, Metallurgy and Materials Science, 2013
In the tundish, purification of steel is given by the use of an oxide powder on the steel surface... more In the tundish, purification of steel is given by the use of an oxide powder on the steel surface. This powder perform several important functions, such as thermal insulation, protection against liquid steel surface oxidation and capturing inclusions from the bath. This paper presents an experiment carried out with an acid powder based on thermal power plant ash to the casting of steel with carbon content from 0.30 to 0.33% and 1.00 - 1.15% manganese. Powder behavior during casting can be summarized as follows: rapid spreading of liquid steel surface, good thermal insulation, revealed by the gradient temperature from the slag. The average specific consumption recorded was very low, 0.4 kg/t liquid steel. It has been analyzed the chemical composition of the slag from the tundish during casting, to prelevate 6 consecutive samples taken during casting. The compositions of these slags were compared to the oxide powder composition initially given on the liquid steel. There was a good abs...
In the tundish, purification of the steel is given by utilisation of an oxide powder on the steel... more In the tundish, purification of the steel is given by utilisation of an oxide powder on the steel surface. This powder perform several important functions, such as thermal insulation, protection against liquid steel surface oxidation and capturing inclusions from the bath. This paper presents an experiment achievement with a acid powder based on thermal power plant ash to the casting of steel with carbon content from 0.30 to 0.33% and 1.00 - 1.15% manganese. Powder behavior during casting can be summarized as follows: rapid spreading of liquid steel surface, good thermal insulation, revealed by the gradient temperature from the slag. The average specific consumption recorded was very low, 0.4 kg / t liquid steel. It has been analyzed the chemical composition of the slag from the tundish during casting, to prelevate 6 consecutive samples taken during the sequence of the casting. The compositions of these slags were compared with the oxide powder composition initially given on the liqueed steel. There was a good absorption of inclusions, as evidenced by last composition of analyzed slag sample. There was a strong increase of MnO content and changes in values of the other oxide compounds, such as SiO2. The paper highlights the experimental slag capacity, a hard acid slag based on thermal power plant ash, to capture the MnO type inclusions, up to 38%. This process can be interpreted as negative, meaning that the acid slag is absorbed from the steel alloying element, manganese.
The native vermiculite deposit in Orsova area was used in casting powder technologies and experim... more The native vermiculite deposit in Orsova area was used in casting powder technologies and experimental tests were performed in the laboratory but also in steelwork. Physical and chemical characteristics of experimental tundish powder created the assumption of good behavior. The powders based on raw vermiculite ore had an effective good behavior at the industrial testing, meaning that they had good thermal insulation and a low specific consumption.