what is the difference between reverberotory  furnace and blastfurnace?

Hi,
Reverberatory furnace used for smelting, refining, or melting in which the fuel is not in direct contact with the contents but heats it by a flame blown over it from another chamber. Such furnaces are used in copper, tin, and nickel production.
While Blast furnace produces liquid metals by the reaction of a flow of air introduced under pressure into the bottom of the furnace with a mixture of metallic ore, coke, and flux fed into the top. Blast furnaces are used to produce pig iron from iron ore.
 
Hope it is clear to you.
Best Wishes!

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File:Reverberatory furnace diagram.png

typical diagram for reverbaratory furnace

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blast furnace:-

A blast furnace is a type of metallurgicalfurnace used for smelting to produce industrial metals, generally iron.In a blast furnace, fuel and ore are continuously supplied through the top of the furnace, while air (sometimes with oxygen (enrichment) is blown into the bottom of the chamber, so that the chemical reactions take place throughout the furnace as the material moves downward. The end products are usually molten metal and slag phases tapped from the bottom, and flue gases exiting from the top of the furnace.

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