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- A standard iron solution was prepared by dissolving 0.0140 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.214 in a 1.00 cm cuvette. A 0.128 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to the mark with water. A 1.00 mL aliquot of the sample was transferred to a 25.00 mL volumetric flask, and diluted to the mark with water. A portion of the diluted sample was then transferred to a 1.00 cm cuvette and measured at a wavelength of 540 nm. The resulting absorbance was 0.216. Determine the % w/w of Fe in the iron ore.Write the Chemical reactions taking place in different zones in the blast furnace for the extraction of iron from its ore.The production of high-grade iron from hematite and magnetite using a blast furnace involves several reactions as described
- Write down the reactions taking place in different zones in the blast furnace during the extraction of iron. How is pig iron different from cast iron?Suggest and explain in detail one heat treatment procedure that can strengthen or harden (the medium- carbon steel). Sketch the microstructure of the steel after being hardened. Compare the mechanical behaviour of the hardened steel to the plain carbon steel based on their microstructures.Si is doped with 2x1017 boron (B) atoms/cm³ and 6x1017 phosphorous (P) atoms/cm³. (a) Is this n-type or p-type and why? (b) What are the electron and hole concentrations at 300K? (use ni = 1010 cm³). (c) Calculate resistivity of Si is doped with donor density of Np = 2x1015 (use n¡ = 10!º cm³) and NA = 0 (use n¡ = 1010 ; µn = 1320 cm²/Vs, µp = 460 cm²/Vs) cm (d) In a Germanium semiconductor at T= 250 K (n¡ = 1x1012 cm³), it is found that po = 4no and that Nd = 0. Determine po, no, and Na. (e) Calculate the intrinsic carrier concentrations of these three bandgap materials at 300K: Eg = 1.12eV; and Eg = 0.66eV; where pre-factors are B=1.08x1031 K*.cm3 (1.12eV) and B = 2.31x1030 K³.cm³ (0.66€V).
- (b) Answer both: i. Define Refractory material and give its one application. ii. Define porosity of refractory and its effect on strength.a) Calculate the basicity and acidity of a slag composed of 41 wt% SiO2; 13 wt% FeO; 39 wt% CaO, 7 wt% MgO. (Molecular Weights; Ca: 40.08, O: 16.0, Fe: 55.85, Si: 28.08, Mg: 24.31) b) Describe the formation stage of white matte during the pyrometallurgical production of copper. Calculate the theoretical amount of Cu in the white matte. (Molecular Weights; O: 16, Fe: 55.85, Si: 28.08, Cu: 63.5, S: 32.06).Differentiate AAS, AAS-Graphite, FES and ICP-MS