roasting$93865$ - meaning and definition. What is roasting$93865$
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What (who) is roasting$93865$ - definition

STEP OF THE PROCESSING OF CERTAIN ORES
Pyrohydrolysis; Quartz Roasting; Roasting (Metallurgy)
  • A reverberatory furnace for roasting tin ores
  • blebs]] of native gold.

roast         
  • Whole roast chicken
  • Roasted vegetables
  • A [[Sunday roast]] consisting of [[roast beef]], [[potato]]es, [[vegetable]]s, and [[Yorkshire pudding]]
  • [[Shawarma]] prepared on a rotating spit
COOKING METHOD THAT USES DRY HEAT WHERE HOT AIR ENVELOPS THE FOOD, COOKING IT EVENLY ON ALL SIDES
Roast; Roasted; Roasts; Cooking/Roasting; Assation; Meat roast; Roaſting
¦ verb
1. (with reference to food, especially meat) cook or be cooked by prolonged exposure to heat in an oven or over a fire.
process (a foodstuff, metal ore, etc.) by subjecting it to intense heat.
2. make or become very warm.
3. informal criticize or reprimand severely.
¦ adjective (of food) having been roasted.
¦ noun
1. a joint of meat that has been roasted or that is intended for roasting.
2. the process of roasting something, especially coffee.
a particular type of roasted coffee.
3. an outdoor party at which meat is roasted.
Derivatives
roaster noun
Origin
ME: from OFr. rostir, of W. Gmc origin.
Roasting (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.
Roast         
  • Whole roast chicken
  • Roasted vegetables
  • A [[Sunday roast]] consisting of [[roast beef]], [[potato]]es, [[vegetable]]s, and [[Yorkshire pudding]]
  • [[Shawarma]] prepared on a rotating spit
COOKING METHOD THAT USES DRY HEAT WHERE HOT AIR ENVELOPS THE FOOD, COOKING IT EVENLY ON ALL SIDES
Roast; Roasted; Roasts; Cooking/Roasting; Assation; Meat roast; Roaſting
·vt To banter severely.
II. Roast ·adj Roasted; as, roast beef.
III. Roast ·vi To undergo the process of being roasted.
IV. Roast ·vt To dissipate by heat the volatile parts of, as ores.
V. Roast ·vt Hence, to heat to excess; to heat violently; to Burn.
VI. Roast ·vi To cook meat, fish, ·etc., by heat, as before the fire or in an Oven.
VII. Roast ·vt To cook by surrounding with hot embers, ashes, sand, ·etc.; as, to roast a potato in ashes.
VIII. Roast ·vt To dry and parch by exposure to heat; as, to roast coffee; to roast chestnuts, or peanuts.
IX. Roast ·noun That which is roasted; a piece of meat which has been roasted, or is suitable for being roasted.
X. Roast ·vt To cook by exposure to radiant heat before a fire; as, to roast meat on a spit, or in an oven open toward the fire and having reflecting surfaces within; also, to cook in a close oven.

Wikipedia

Roasting (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). Often before roasting, the ore has already been partially purified, e.g. by froth flotation. The concentrate is mixed with other materials to facilitate the process. The technology is useful in making certain ores usable but it can also be a serious source of air pollution.

Roasting consists of thermal gas–solid reactions, which can include oxidation, reduction, chlorination, sulfation, and pyrohydrolysis. In roasting, the ore or ore concentrate is treated with very hot air. This process is generally applied to sulfide minerals. During roasting, the sulfide is converted to an oxide, and sulfur is released as sulfur dioxide, a gas. For the ores Cu2S (chalcocite) and ZnS (sphalerite), balanced equations for the roasting are:

2 Cu2S + 3 O2 → 2 Cu2O + 2 SO2
2 ZnS + 3 O2 → 2 ZnO + 2 SO2

The gaseous product of sulfide roasting, sulfur dioxide (SO2) is often used to produce sulfuric acid. Many sulfide minerals contain other components such as arsenic that are released into the environment.

Up until the early 20th century, roasting was started by burning wood on top of ore. This would raise the temperature of the ore to the point where its sulfur content would become its source of fuel, and the roasting process could continue without external fuel sources. Early sulfide roasting was practiced in this manner in "open hearth" roasters, which were manually stirred (a practice called "rabbling") using rake-like tools to expose unroasted ore to oxygen as the reaction proceeded.

This process released large amounts of acidic, metallic, and other toxic compounds. Results of this include areas that even after 60–80 years are still largely lifeless, often exactly corresponding to the area of the roast bed, some of which are hundreds of metres wide by kilometres long. Roasting is an exothermic process.