A kind of mixed media composed of fly ash and acid residue of furfural for land reclamation and its leaching requirement

Filling the subsided land with fly ash is the dominant land reclamation way in the coal mine area at present. In order to avoid some disadvantages of the fly ash such as nutrition element absence, high pH value, poor water holding capacity and harmful toxic element, a new kind of land media for land reclamation composed of different proportion of fly ash and the acid residue of furfural is developed based on pot tests in this paper. The results indicate that the properties of the fly ash is improved after the acid residue of furfural is added and this new medium is helpful for the plant growing by some normal planting management. The optimum proportion of acid residue of furfural in this new medium is 5%～20%. It is also found out that salt may be the main factor restraining plant from normal growth. In order to keep suitable salt content, salt washing for this new medium, in an example case, is needed and the washing amount is suggested about 4.39×10³ m³ /hm².