Study On Synthesis Solid Compound Fertilizer From Titanium-bearing Blast Furnace Slag

The use of the titanium-bearing blast furnace slag has been a focus in resource domain for the waste of large quantities of titanium and environment pollution caused by the discharging of the titanium-bearing blast furnace slag. The significance of its utilization is obvious for the sustain development of metallurgical industry. The aims of this research are to find some new ways for comprehensive utilization of titanium-bearing blast furnace slag, and at the same time to meet the demands of agricultural production as nutritional elements of plants. According to the content of nutritional elements in cultivated soil and the characteristics of titanium-bearing blast furnace slag, the fertilizer has been determined as solid compound fertilizer, and cultivation experiment on soybean with the solid compound fertilizer was studied for the first time.In this study, the titanium-bearing blast furnace slag was used as a major raw material to synthesis solid compound fertilizer by heat-melting, to enhance its solving rate and make beneficial nutritional elements convert into the absorbtive form by plants easily. The feasibility of (NH4)2SO4-fusion was proved by the qualitative experiment of alkali-fusion and qualitative experiment of (NH4)2SO4-fusion.The effects of different parameters on the solving rate of solid compound fertilizer were analysed through the orthogonal experiment of (NH4)2SO4-fusion. As a result, the optimum synthesis process conditions of solid compound fertilizer from water-quenched slag were:the reaction temperature was 360℃, the holding time was 35 min, the addition of (NH4)2SO4 was 8 times of the slag. Under these conditions the maximum quality of water-soluble titanium was 0.305 g, the solving rate was 88.2%.The agricultural cultivation experimental was studied by planting common soybean, investigating the effects of the solid compound fertilizer on growth conditions, character, yield and the content of nutrient component. The results showed that the solid compound fertilizer can make the plant height, the number of knot, the main root length and the weight of dry leaf increase significantly; make the number of empty legumen per plant, the weight rate of hull and grain decrease significantly, make the number of legumen per plant, the weight of legumen per plant, the number of grain per plant and the weight of grain per plant increase significantly, however, there is no diversification in the weight of per 100 grains, the content of protein and amylum. The results showed that the solid compound fertilizer can promote the plant and the root of soybean to grow, enhance the yield of soybean by increasing the number of legumen per plant, the weight of legumen per plant and the number of grain per plant.