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Features of ore and impurity are given in the table. Write down the method used for the separation of the ore. Ore Impurity Method High density Low density (i) Magnetic Non Magnetic (ii)Low density High density (iii) Dissolved in the solvent didn't dislove (iv)a. How can we convert ore into its oxide form? Explain with proper examplesb. ZnCO3 /Cu2S in these two calcination is used for ………. and Roasting is used for ……….. c. Give Examples for reducing agents for reducing oxide ores. d. Strongest reduction agent e. Which reducing agent used fur reducing ZnO, Fe2O3 , Al2O3 ? |
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Answer» i. Levigation/Hydraulic washing ii. Magnetic Separation iii. Froth Floatation iv. Leaching a. Calcination Calcination is the process of heating the concentrated ore at a temperature below its melting point to remove the volatile impurities. When subjected to calcination, impurities like water, organic matter, and other volatile impurities are expelled from the ore. Metal Carbonate and hydroxides decompose to form oxides, eg: ZnCO is converted to ZnO by calcination Roasting: Roasting is the process of heating the concentrated ore at a temperature below its melting point in a current of air. During roasting the ore gets converted into its oxide. When the concentrated ore is subjected to roasting, the water present in it is removed as vapor. Other impurities like sulfur, phosphorus and organic matter are oxidized and expelled. The sulfide combines with oxygen to form oxide eg: Cu2S ore is converted to Cu2O by roasting; b. Calcination – ZnCO3 , Roasting – Cu2S c. Carbon monoxide, Carbon, Electricity d. Electricity e. Carbon Monoxide is used as the reducing agent to extract iron from haematite. (Fe2O3) ZnO :- Carbon is used as the reducing agent to extract Zinc from Zinc Oxide. Electricity is used to extract aluminum from Al2O3 |
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