When i mix the prepared activated carbon with the water to wash it, it never settles down, it always floating at the top so i could not remove the ashes completely from the prepared activated carbon. How this problem can be solved?
Water is not enough by itself, and the washing must be extensive.
Therefore, better using a solution of HCl refluxing for several days in a Soxhlet extractor. After this, water must be used in the same conditions until the pH of the rinse if neutral. A bit long, but very efficient.
Alain
Water is not enough by itself, and the washing must be extensive.
Therefore, better using a solution of HCl refluxing for several days in a Soxhlet extractor. After this, water must be used in the same conditions until the pH of the rinse if neutral. A bit long, but very efficient.
Alain
Dear Celzard
thank you very much once again for your time and guidance.
I agree with Mr Alain,
As Ash particle are composed of inorganic metal oxides that can be washed by 1N HCl solution.
Be careful with the HCl's purity, remember you are manufacturing activated carbon, beware of not poisoning it
Other possibility to separate ash from activated carbon, if you do not want to use chemical methods, is the use of oil (usually vegetable oils) agglomeration. Some information can be found in: ALONSO M.I., VALDES A.F., MARTINEZ-TARAZONA, R.M., GARCIA, A.B. Coal recovery from coal fines clearing wastes by agglomeration with vegetable oils: effects of oil type and concentration, Fuel, 1999, Vol. 78, pp. 753– 759. and RUBIO, B., IZQUIERDO, M.T., MAYORAL, M.C., BONA, M.T., MARTINEZ-TARAZONA, R.M., Preparation and characterization of carbon-enriched coal fly ash. J. Environ. Manage. 2008, Vol. 88, pp. 1562-1570.
The most common method is the washing with acid solutions (HCl, HNO3...).
However, you must be careful with the particle size. Ash dissolution becomes more complicated as particle diameter increases.
Ans: BY using membrane of desirable size through which ash can pass by ashing coal withsuitable solvent.
HNO3/HCL/HF treatment useful in removal of ash contents in activated carbon.
- Badges
- Science topic
- Similar topics
- Engineering
- Chemical Engineering