Chapter : 1. Metals & Non Metals
Reduction with aluminium (thermit process or alumino-thermic process)
Reduction with aluminium (thermit process or alumino-thermic process)
Some metal oxides cannot be reduced satisfactorily by carbon. For them, aluminium, a more reactive metal, is used. The process is called thermic process or alumino-thermic process.
EXAMPLES :
(i) Manganese dioxide is reduced to manganese by heating with aluminium.
3MnO2 + 4Al → 3Mn + 2Al2O3
(ii) Ferric oxide (Fe2O3), is reduced by aluminium to free iron.
Fe2O3 + 2Al → 2Fe + Al2O3
(iii) Chromium sesquioxide is reduced by aluminium to chromium metal.
Cr2O3 + 2Al → 2Cr + Al2O3
In the thermit process, aluminium powder is mixed with metal oxide. A piece of magnesium is set alight to start the reaction. The aluminium reduces the oxide to free metal.
In case of iron oxide, iron is obtained in the molten state. (The mixture of iron oxide and aluminium powder is called thermite). The molten iron may be allowed to trickle down to weld two iron objects together. Cracked machine parts, railway tracks, etc., are joined by this method.
Some metal oxides cannot be reduced satisfactorily by carbon. For them, aluminium, a more reactive metal, is used. The process is called thermic process or alumino-thermic process.
EXAMPLES :
(i) Manganese dioxide is reduced to manganese by heating with aluminium.
3MnO2 + 4Al → 3Mn + 2Al2O3
(ii) Ferric oxide (Fe2O3), is reduced by aluminium to free iron.
Fe2O3 + 2Al → 2Fe + Al2O3
(iii) Chromium sesquioxide is reduced by aluminium to chromium metal.
Cr2O3 + 2Al → 2Cr + Al2O3
In the thermit process, aluminium powder is mixed with metal oxide. A piece of magnesium is set alight to start the reaction. The aluminium reduces the oxide to free metal.
In case of iron oxide, iron is obtained in the molten state. (The mixture of iron oxide and aluminium powder is called thermite). The molten iron may be allowed to trickle down to weld two iron objects together. Cracked machine parts, railway tracks, etc., are joined by this method.
Trending Articles & Blogs
- Physics Tutor, Math Tutor Improve Your Child’s Knowledge
- How to Get Maximum Marks in Examination Preparation Strategy by Dr. Mukesh Shrimali
- 5 Important Tips To Personal Development Apply In Your Daily Life
- Breaking the Barriers Between High School and Higher Education
- 14 Vocational courses after class 12th
- Tips to Get Maximum Marks in Physics Examination
- Get Full Marks in Biology Class 12 CBSE
Download Old Sample Papers For Class X & XII
Download Practical Solutions of Chemistry and Physics for Class 12 with Solutions
Recent Questions Asked
- Newton’s laws of motion asked by Dr. Mukesh Shrimali
- Process of nutrition in Amoeba asked by Rajiv Sharma
- Importance of studying physics subject in school after 10th asked by Rajiv
- Refraction Through Prism in Different Medium asked by Kirti Sharma
- Ratio and Proportion Question asked by Education Desk
- Explain all the 12 tenses with example asked by Qwerty
- Refraction Through Prism in Different Medium asked by Seema Shrimali