A method for deashing rice husk by alkaline leaching was developed and optimum deashing to the extent of 93% was achieved The preparation of granular activated-carbon from high- and low-ash rice husk was carried out with zinc chloride as an activating agent as well as a binder. It was established that granular activated-carbon of balanced micro-, meso- and macropores and appropriate hardness may be prepared from low-ash rice husk with 75% zinc chloride as an activating agent.