Reducing the Ash Content in Raw Coal by Using Acids and Bases, as the HSE Process

In this letter, this fact is indicated that nearly 80% of ash could be removed by Leaching process from coal sample. We know very well that Ash , as an inorganic matter present in coal is amenable for dissolution using suitable reagents. Thus, the dissolution of ash and its subsequent removal reduces the release of many toxic elements into the environment by coal based industries. Removal of ash also enhances the calorific value. In the present investigation an attempt has been made to reduce the ash content of raw coal obtained from nearest thermal power by using nitric acid, sulfuric acid and potassium hydroxide. A series of leaching experiments were conducted on coal of different size fractions by varying the parameters like concentration, temperature and time of leaching. The results indicate that it is possible to remove nearly 80% of ash from coal sample by leaching.Finally, we can conclude that the leaching process is accounted as a subset of the environmental process which itself is one of the main factors of HSE.

کلیدواژه ها:

Ash ، Leaching process ، Pollution ، Coal ، HSE