Iron zirconium is an iron alloy composed of zirconium, iron, silicon and aluminum. The ferrozirconium used for steel making is ferrozirconium silicon, containing Zr15% ~ 45%, Si30% ~ 65%. The products produced by aluminothermic method are called zirconium aluminum iron because they contain aluminum, containing Zr>15%. In 1789, a new oxide called "Zircomia" was discovered at m.h.kelproth in Germany. Zirconium was first made by j.j.berzelius of Sweden in 1824 by reducing K2ZrF6 by potassium. In 1923, the experiment of using ferrozirconium and ferrosilicon as deoxidizer was carried out for the first time in American steel mills, and good results were obtained. After that, ferrozirconium silicon and ferroaluminium zirconium were produced by metal thermal process. China nanjing special alloy factory, in 1987, trial production of iron zirconium silicon, containing zr 20% ~ 40%, si45% ~ 55%; Used as deoxidizer in steelmaking. The atomic weight of zirconium is 91.22. The e outer electronic structure is ztdz5s. Melting point is 1852 ℃. The boiling point of 4400 ℃. 6.49 g/cm3 density (20 ℃). The ferrozirconium phase diagram shows an FN. Zirconium and iron form a stable compound, FeZr2(45.1%zr), with a melting point of 1650℃. At 16%Zr, the eutectic melting point is 1330℃. The eutectic melting point is about 940℃ at 84%Zr. Zirconium and silicon form a variety of zirconium silicide. There are Zr: Si(Si13.65%), ZrSi3(Si15.55%), ZrSi(Si23.55%) and ZrSi2(si38.12%). The density of commercial iron zirconium silicon is about 3.5g/cm3, and the melting temperature ranges from 1260 ℃ to 1345℃. Zirconium is a rare metal. It's a carbide forming element. Zirconium is a powerful deoxidizing and denitrifying element in steelmaking. Zirconium can refine the austenite grain of steel. It combines with sulfur to form zirconium sulfide and thus prevents hot brittleness of steel. Zirconium also has the advantages of reducing the strain aging and improving the low temperature toughness of steel.
Zirconium ACTS like titanium in cast iron. Zirconium carbide can be formed, which combines with sulfur to form sulfide. It promotes the formation of graphite during cooling. A small amount of zirconium is conducive to the graphitization of white cast iron, so that the white iron mouth gray mouth. The annealing time is shortened in the production of ductile cast iron. Zirconium resources there are more than a dozen kinds of zirconium ores. Only zircon and baddeleyite are available in industry. Zirconium, also known as zircon, is the most widely distributed zirconium mineral. The main production for the United States, Brazil, India, Australia, China and the commonwealth of independent states and other countries. Its main composition is ZrO2•SiO2. The theoretical components are: ZrO267.01% and SiO233.99%. The contents of various impurities in zirconium ore are: Fe2O3)0.5% ~ 5.0% and a small amount of CaO,.MgO, TiO2, etc. The main sources of oblique zircon are Brazil and Sri Lanka. China's reserves are small. The main component is ZrO2. Industrial oblique zircon contains ZrO275% ~ 85%, the main impurities are Fe2O32% ~ 5%, SiO210% ~ 20%, and a small amount of A1203 and TiO2. The mineral density was 5.7g/cm3 mohs hardness 6.5.
