what is coal whashing

Coal washing is a process carried out in a coal washery or coal preparation plant (CPP). In this process, raw coal is refined or cleaned to remove impurities. Here’s how it works:

1. Purpose:
   • The primary goal of coal washing is to enhance the quality and efficiency of coal by removing non-combustible impurities.
   • It results in cleaner coal that burns more efficiently and fetches better prices in the market.
2. Methods:
   • Water and Mechanical Techniques: Coal washing involves using water and mechanical methods to separate coal from its impurities.
   • Gravity Separation: The process relies on the difference in density between coal and its impurities. Impurities are usually more densely packed because they are inorganic materials.
   • Specific Gravity: Industrial separators are used based on the specific gravity of coal and associated impurities (such as shale, sand, and stones).
3. Formation of Coal:
   • Coal is a type of sedimentary rock formed from buried vegetation that undergoes transformation due to pressure and heat over long periods.
   • With enough time, pressure, and heat, coal can eventually turn into diamond formations.
4. Benefits:
   • Increased Efficiency: Washing coal improves its combustion efficiency.
   • Quality Enhancement: Cleaner coal translates to better quality.
   • Emission Reduction: Cleaner coal can help reduce emissions during burning.