Define galvinsation,roasting,calcination?
Answers
Explanation:
Calcination:
The ore is heated to a high temperature below its melting point in the absence of air or in a limited supply of air. The organic matter, moisture, volatile impurities like carbon dioxide and sulphur dioxide are expelled from the ore. It makes the ore porous. For example, zinc carbonate decomposes to give zinc oxide and carbon dioxide.
Roasting:
Roasting:Ores are heated to a high temperature below their melting point in the presence of excess air. The moisture escapes and impurities like sulphur, arsenic, phosphorous etc are oxidized to their volatile oxides. The mass becomes porous.
Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.
Answer:
Galvinsation- the process of depositing a layer of zinc on iron is called galvinsation like example if iron water pipes which used to supply water to home are galvanised to preven from rusting
rusting not roasting correct spelling mistakes
now because it harm in feature an aln teases so correct don't think bad about me
rusting - when the iron comes contact with oxygen and water react from new colour called rust or we can say rust is iron oxide fromed by the reaction of iron with atmospheric oxygen in presence of moisture thus it is a chemical changes
calcination - the heating of solid to a high temperature for the purpose of removing volatile substance oxdizing a portion of mass or friable। example - calcination of limestone involved decomposition of carbonateores and removal of carbon-dioxide