|
|
Calcination refers to a thermal treatment process applied to ores and other solid materials in the absence of oxygen or air. Calcination is one of the important methods used for the extraction of metals in metallurgy. This process is carried out in a controlled environment with a regulated temperature. The calcination method generally removes moisture from compounds. In this article, we are going to discuss the Calcination process, Calcination definition, Calcination formula, Calcination example, the difference between calcination and roasting, and a few applications of calcination. Table of Content What is Calcination?Calcination also known as calcining is a process of heating a solid compound at a very high temperature below its melting point. This process is carried out in the absence of oxygen or a limited supply of oxygen. The process involves heating a substance to high temperatures, typically between 700 ℃ to 1200 ℃, although the specific temperature can vary based on the melting point of the material and the desired outcome. In some cases, calcination of a metal results in oxidation of the metal. In the calcination process, a substance is heated below its melting or fusion point. During this process, the moisture is removed (i.e. water from ore is removed leaving the metal oxide behind). In many industrial processes, calcination is a necessary step that changes the chemical and physical characteristics of materials for a range of uses. In the metal carbonates, the calcination process is carried out to turn metal carbonates into carbon dioxides and metal oxides. Calcination Definition
Calcination in other words also called as purification because it is used for the extraction of metals from its ore. In other words, we can say that Calcination is the process of heating ore to a high enough temperature to turn it into an oxide. Either in the absence of air or with insufficient supply, the ore is heated below its melting point. Calcination FormulaCalcination is the process of heating a material to high temperatures, frequently without or with restricted air or oxygen supply. This causes the material to undergo chemical and physical changes. Although a universal “calcination formula” does not exist, the overall idea can be expressed by a simpler equation. The formula for calcined gypsum can be given as:
Calcination ExampleExamples of Calcination include:
Calcination process is also used in the manufacture of quick lime from limestone. The ore is disposed of moisture, organic content, and volatile contaminants including sulfur dioxide and carbon dioxide. It increases porousness. Carbon dioxide and metal oxides are produced during the breakdown of carbonate ores. Calcination ProcessCalcination Process is carried out by heating a chemical compound at a very high temperature without melting it. It is performed under very little supply of oxygen. There are several steps performed during calcination process. These steps are:
PreparationThe material is crushed and grinded into small particles from large solid ores. These small particles will enhance the efficiency of the calcination process. HeatingAfter that, the material is heated to high temperatures in a regulated setting. The material and the intended result determine the precise temperature and heating time. For instance, calcium carbonate is heated to temperatures more than 800 degrees Celsius. Chemical ReactionAfter heating the material the chemical reaction is performed with a limited supply of oxygen. The chemical reaction removes water from the material and yields its oxide. Carbonates and other compounds decompose, lose moisture, and undergo oxidation or reduction when a substance is heated below its melting points at a high temperature. CoolingAfter the desired chemical changes have taken place, the material is allowed to cool down. The cooling process may be slow to avoid undesired reactions or changes. Calcination ReactionsCalcination reactions occur due to the heating of a substance at a very high temperature in a limited supply of oxygen. These reactions result in physical and chemical changes in the material, often leading to the removal of volatile components, decomposition of compounds, or other transformations. Some substances that show Calcination reactions are Limestone (Calcium Carbonate), Gypsum (Calcium Sulfate Dihydrate), Calcination of Aluminum Hydroxide, Calcination of Magnesium Carbonate, etc. Few of the Calcination Reactions are explained below: Calcination of GypsumThe chemical formula of gypsum is CaSO4․2H2O. Gypsum is known as calcium sulfate dihydrate due to the presence of two molecules of water. When gypsum is subjected to calcination then it produces calcium sulfate hemihydrate, well known as plaster of Paris (P.O.P.). The formula of plaster of Paris is CaSO4.1/2H2O. The Calcination reaction of gypsum can be given as
Read More, Plaster of Paris Calcination of LimestoneCalcination process is used for the extraction of many metals from its ores. Although there are many examples of the calcination process. Calcination of limestone (CaCO3) is one of the most famous examples of the calcination process. When limestone is heated at 848o C, it decomposes into calcium oxide and carbon dioxide.
Read More, Calcium Carbonate Difference Between Calcination and RoastingThe key difference between Roasting and Calcination is given below:
Read More, Calcination VS Roasting Applications of CalcinationCalcination has a wide range of uses, a few of which are described below:
Read More, Calcination: Frequently Asked QuestionsWhat is Calcination and Roasting?
Name Two Metals which gets Oxidized during the Calcination Process.
What is Heat of Calcination?
Is Calcination Exothermic or Endothermic?
What is Calcination Temperature?
|
Reffered: https://www.geeksforgeeks.org
| Class 10 |
Type: | Geek |
Category: | Coding |
Sub Category: | Tutorial |
Uploaded by: | Admin |
Views: | 14 |