Abstract:

Abstract：【OBJECTIVE】N,P and K adsorption and desorption characteristics of oil shale (debris and lean ore) and the residue (ash) were studied in this paper.【METHOD】An equilibrium method was used to study in this article.【RESULTS】the sequence of oil shale and residue to the nitrogen adsorptive capacity was the debris > the ash > the lean ore,the maximum adsorption capacity of the debris was 1429 mg/kg,which was 1.86 times of the ash and 2.29 times of the lean ore .The sequence of oil shale and residue to the nitrogen desorption rate was the debris > the ash > the lean ore.,the average desorption rate of the debris was 73.72%, which was 1.04 times of the ash and 1.09 times of the lean ore .The sequence of oil shale and residue to the phosphorus adsorptive capacity was the debris > the ash > the lean ore , the maximum adsorption capacity of the debris was 909.1 mg/kg，which was 1.27 times of the ash and 2.45 times of the lean ore . The sequence of oil shale and residue to the phosphorus desorption rate was the debris> the lean ore > the ash, the average desorption rate of the debris was 13.86%, which was 1.22 times of the lean ore and 2.67 times of the ash.The sequence of oil shale and residue to the potassium adsorptive capacity was the debris > the lean ore > the ash , the maximum adsorption capacity of the debris was 2500mg/kg,which was 2.00 times of the lean ore and 4.25 times of the ash . The sequence of oil shale and residue to the potassium desorption rate was the debris > the lean ore >the ash, the average desorption rate of the debris was 86.87%, which was 1.03 times of the lean ore and 1.22 times of the ash.. 【CONCLUSION】On conclusion,the adsorption capacity and desorption rate of N,P,K in oil shale debris were the highest ,so oil shale debris as keeping fertilizer agents have the possibilities of development .