The reduction of oxides of active metals such as sodium, potassium etc., by carbon is thermodynamically not feasible. Write a short note on electrochemical principles of metallurgy. Explain with the help of an example.​, which one of the following have highest dipole moment​, When SO3, is dissolved in water solution becomes acidic. Bauxite has the composition. (ii) Difference between roasting and calcination. Log in. by froth flotation. Consider the natural occurring ores of zinc (\(ZnS\) (sphalerite) a nd \(ZnCO_3\) (s mithsonite). Secondary School. Ex: 2PbS + 3O 2 2PbO + 2SO 2 Answer: (i) The given metals are arranged in the activity series of metals as follows: Na, Ca, Mg, Al, Zn, Fe, Pb (most reactive) and Cu (l… During roasting, the sulfide is converted to an oxide, and sulfur is released as sulfur dioxide, a gas. The second reaction involving an oxide ore is facilitated by addition of elemental sulfur. Which has more calories: table sugar or aspartame? Roasting is an exothermic process. In this process the sulphide ores are oxidised converted to oxides. Class-10 » Science. share | improve this answer | follow | answered Apr 21 '15 at 14:32. Metallurgy and Materials Science Pdf Notes – MMS Notes Pdf. 1. Join Yahoo Answers and get 100 points today. The concentrate is mixed with other materials to facilitate the process. a) Roasting b) Smelting c) Zone refining d) Reduction 5) As in bessemeration process the lining of silica brick is used and the process is known as a) Acid bessemer b) Basic bessemer c) Neutral bessemer d) Bessemerisaton 6) The insoluble impurities either dissolve in … : 23 2 2ZnS O ZnO SO+→ + 22 Different types of roasting are a. oxidizing roasting b. 9. Roasting of sulphide ore gives the gas (A). d) None of these . Choose the correct answer: 1. State the processes involved in metallurgy. Magnetic roasting involves controlled roasting of the ore to convert it into a magnetic form, thus enabling easy separation and processing in subsequent steps. Such metals are extracted from their ores by using electrochemical methods. Question 1: (i) Arrange Cu, Ca, Al, Fe, Mg, Pb, Na and Zn in the decreasing order, in which they appear in the activity series; putting down the most reactive metal first and least reactive in the last. 11. Roasting=One is heated in the presence of excess of oxygen or air. M 4 D - Risk avoidance Managing the IS Project. If the oxygen component is more it would actually be then a roasting process where sulfides are converted to oxides since they are easier to reduce. THANK YOU ALL Short answer Questions. View Full Answer * Roasting is a process in metallurgy in which a sulfide ore is heated in air. For example, lead sulfide ores are subjected to sinter roasting in a continuous process after froth flotation to convert the fine ores to workable agglomerates for further smelting operations. Results of this include areas that even after 60–80 years are still largely lifeless, often exactly corresponding to the area of the roast bed, some of which are hundreds of metres wide by kilometres long. …, Classify the acid based on the earth sourses.​. Join now. [citation needed]. Volatilizing roasting, involves careful oxidation at elevated temperatures of the ores, to eliminate impurity elements in the form of their volatile oxides. [2][3], The following describe different forms of roasting:[4]. Get answers by asking now. Solution for Answer the following :(i) What is the role of cryolite in the metallurgy of aluminium? 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