Determination of titanium dioxide in limestone by diantipyrine methane photometric method
Zhu, Jiawen (2020)
Zhu, Jiawen
2020
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2020062219213
https://urn.fi/URN:NBN:fi:amk-2020062219213
Tiivistelmä
Iron ore contains useless gangue (useless rock or tailings containing useful metals or minerals) in iron-making, the main component of gangue is silica dioxide. In the process of ironmaking, iron is changed into liquid state at high temperature. Because the melting point of silica is very high, this particle im-purity is mixed in molten iron. In order to remove this impurity, limestone is chosen as the agent of fusion. The reason for choosing limestone as flux is that limestone will decompose into calcium oxide and carbon dioxide at high temperature. Calcium oxide reacts with silica at high temperature to form calcium silicate with lower melting point than that of molten iron. Because the density of liquid calcium silicate is smaller than that of molten iron, and molten iron and liquid calcium silicate are insoluble. Liquid calcium silicate floats on the molten iron.
Because micro alloyed steel and pure steel (steel with few non-metallic inclusions and gases, or steel with few harmful elements such as oxygen, sulfur, phosphorus, hydrogen and nitrogen) have higher requirements for non-metallic inclusion control (in the process of steelmaking, a small amount of slag, refractories and reaction products are formed by entering the molten steel) of steel. Titanium is one of the important alloy elements. In addition to its strong deoxidizing ability, it can also denature non-metallic inclusions in steel, thus improving the mechanical properties of steel. Therefore, adding proper amount of titanium into steel has an important influence on the quality of steel, what kind of inclusions are formed and the shape of inclusions. Therefore, the accurate determination of titanium dioxide in limestone is of great significance to the control of inclusions in steel.
The spectrophotometer is a common device. This method does not have high requirements on the laboratory. The diantipyryl methane (DAPM) photometric method is a color reagent with less interference and has strong adaptability. In this experiment, the DAPM photometric method will be used to measure titanium dioxide in limestone.
Because micro alloyed steel and pure steel (steel with few non-metallic inclusions and gases, or steel with few harmful elements such as oxygen, sulfur, phosphorus, hydrogen and nitrogen) have higher requirements for non-metallic inclusion control (in the process of steelmaking, a small amount of slag, refractories and reaction products are formed by entering the molten steel) of steel. Titanium is one of the important alloy elements. In addition to its strong deoxidizing ability, it can also denature non-metallic inclusions in steel, thus improving the mechanical properties of steel. Therefore, adding proper amount of titanium into steel has an important influence on the quality of steel, what kind of inclusions are formed and the shape of inclusions. Therefore, the accurate determination of titanium dioxide in limestone is of great significance to the control of inclusions in steel.
The spectrophotometer is a common device. This method does not have high requirements on the laboratory. The diantipyryl methane (DAPM) photometric method is a color reagent with less interference and has strong adaptability. In this experiment, the DAPM photometric method will be used to measure titanium dioxide in limestone.