Metallurgy

Read more about the article Name the following : (i) A metallic ore converted to it’s oxide – iron [II] oxide on heating the concentrated ore. </br>(ii) A black metallic oxide reduced to metal on heating with coke.  </br>(iii) The compound which on ignition at elevated temperatures gives pure alumina.  </br>(iv) The non-metal which forms the anode during electrolytic reduction of fused alumina in Hall Heroult’s process.  </br>(v) A metal other than manganese, present in duralumin but not in magnalium.

Name the following : (i) A metallic ore converted to it’s oxide – iron [II] oxide on heating the concentrated ore.
(ii) A black metallic oxide reduced to metal on heating with coke.  
(iii) The compound which on ignition at elevated temperatures gives pure alumina.  
(iv) The non-metal which forms the anode during electrolytic reduction of fused alumina in Hall Heroult’s process.  
(v) A metal other than manganese, present in duralumin but not in magnalium.

(i) Spathic Iron Ore (Iron [II] Carbonate, FeCO3) (ii) CuO (iii) Aluminium hydroxide (iv) Carbon (Graphite) (v) Copper (Cu)

Read more about the article Define (a) alloy (b) amalgam

Define (a) alloy (b) amalgam

(a) An alloy is a mixture of two or more metals, or a metal and another element, that has metallic properties. (b) An amalgam is a specific type of alloy…

Read more about the article Give reasons for the following pertaining to Hall Herault’s process. </br>(i) The fusion temperature of the electrolyte has to be lowered before conducting the electrolytic reduction. </br>(ii) The constituents of the electrolyte in addition to one part of fused alumina contains three parts of cryolite and one part of fluorspar. </br>(iii) A layer of powdered coke sprinkled over the electrolytic mixture, protects the carbon electrodes. </br>(iv) It is preferred to use a number of graphite electrodes as anode, instead of a single graphite electrode.

Give reasons for the following pertaining to Hall Herault’s process.
(i) The fusion temperature of the electrolyte has to be lowered before conducting the electrolytic reduction.
(ii) The constituents of the electrolyte in addition to one part of fused alumina contains three parts of cryolite and one part of fluorspar.
(iii) A layer of powdered coke sprinkled over the electrolytic mixture, protects the carbon electrodes.
(iv) It is preferred to use a number of graphite electrodes as anode, instead of a single graphite electrode.

(i) The fusion temperature of the electrolyte has to be lowered to save energy and make the process more efficient. Lower temperatures mean less heat is needed to melt the…