Why roasting is done below melting point and smelting is done above melting point?

Explanation: It is a form of extractive metallurgy. Roasting of ore is done below its melting point but smelting is done above the melting point. added to concentrated ore and the mixture is melted by heating at an elevated temperature.

Why smelting is done above its melting point?

Explanation: For smelting metal’s, it is done at a very high temperature above their melting point to either reduce or oxidize the metal resulting in to form a shape for further use. This is done in a furnace of very high temperature which powers the reaction of combustion along with red-ox reactions.

Why roasting of ore is done below its melting point?

Roasting and Calcination: In order to remove the impurities present in the ore, it is heated below its melting point in the process of roasting and calcinations. The process such as roasting and calcinations are used in metallurgy process in order to enrich the standard of the impurity.

Is roasting done above melting point?

Roasting is the process in which ores (generally sulphide ores) are heated in the presence of air to convert it chemical form. Generally it requires below the melting point and it is one of unit operation before smelting.

What is roasting and calcination in metallurgy?

Roasting. Calcination is a process where the air might be supplied in limited quantity, or the ore is heated in the absence of air. Roasting includes heating of ore lower than its melting point in the presence of oxygen or air. Calcination involves the thermal decomposition of carbonate ores.

Does roasting melt the ore?

Roasting involves heating of ore lower than its melting point in the presence of air or oxygen. Calcination involves thermal decomposition of carbonate ores. Roasting is carried out mostly for sulfide minerals.

What is smelting in metallurgy?

Smelting is a form of extractive metallurgy to produce a metal from its ore. Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as gasses or slag and leaving just the metal behind. The reducing agent is commonly a source of carbon such as coke, charcoal, and coal.

What is the process of melting the ores called?

> Smelting is a process of applying heat to ore in order to extract the base metal. It is a form of extractive metallurgy. This involves reduction of ore to the molten metal at a high temperature.

What is roasting also define smelting?

Roasting, or heating in air without fusion, transforms sulfide ores into oxides, the sulfur escaping as sulfur dioxide, a gas. Smelting (q.v.) is the process used in blast furnaces to reduce iron ores. Tin, copper, and lead ores are also smelted.

What is roasting smelting and calcination?

Roasting involves heating of ore lower than its melting point in the presence of air or oxygen. Calcination involves thermal decomposition of carbonate ores. During calcination, moisture is driven out from an ore.

What does roasting mean in metallurgy?

Roasting is a process of heating a sulfide ore to a high temperature in the presence of air. It is a step in the processing of certain ores. More specifically, roasting is often a metallurgical process involving gas–solid reactions at elevated temperatures with the goal of purifying the metal component(s).