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The difference between calcination and roasting
Keywords: anti-corrosion carbon bricks
Release time:
2024-11-19 10:23
Source:
Baking and calcination are two common heat treatment methods, both of which change the physical and chemical properties of a substance by heating it. There are many similarities between the two, but there are also some differences.
1. Different temperatures
The temperature of calcination and roasting also varies. Calcination is generally below 500 ℃, while calcination is much higher, reaching over 1000 ℃. This is because the molecular structure and chemical bond energy of substances are different at different temperatures.
2. Different purposes
The main purpose of calcination is to change the molecular structure of a substance, alleviate its internal tension, and make it more robust. The main equipment is a rotary kiln.
Baking is an important part of preparing furnace materials, and there are various equipment used in industry, such as fixed beds, moving beds, reverberatory furnaces, boiling furnaces, roasting furnaces, etc.
Calcination:
It is the process of thermal dissociation or crystal transformation of natural or synthetic compounds, during which the compound is thermally dissociated into a simpler component or undergoes crystal transformation. Calcination operations can be used to directly process mineral raw materials to meet subsequent process requirements, or to produce chemical concentrates through chemical beneficiation post-processing to meet user requirements for products. This process can be considered as a significant chemical reaction at high temperatures, such as the chemical reaction that occurs after limestone calcination, producing products such as cement, calcium carbonate, and calcium sulfate.
Roasting:
It is the process of heating materials (such as ores) at high temperatures without melting them, in order to change their chemical composition or physical properties. The reaction process of solid materials without melting can include oxidation, pyrolysis, reduction, halogenation, etc. It is commonly used in inorganic chemical and metallurgical industries. The roasting process can be divided into two types: with and without additives, which can be understood as a reaction process carried out under conditions not exceeding the melting temperature.
The commonality between the two is that they are both carried out at high temperatures below the melting point of the furnace material. The difference is that calcination involves a chemical reaction between the raw materials and gases such as air, chlorine, and additives, while calcination involves the loss of crystalline water or volatile components.
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