The effects of calcination temperature,liquid⁃solid ratio and pH on metal recovery were investigated in this work.The influence of the ratio of raw materials, calcination temperature, calcination time,liquid⁃solid ratio and water immersion time on the conversion of alumina was investigated by orthogonal experiment,and characterized by N2 physical adsorption desorption,XRD and SEM.The results showed that 94.0% molybdenum and vanadium could be leached out with the calcination temperature of 800 ℃ and liquid⁃solid ratio of 5∶1.Furthermore,97.6% of the molybdenum ions could be recovered when the pH reached to 1. Through the orthogonal experiment,the recovery conditions of alumina were determined: the ratio of raw material to solid was 1.5,the calcination temperature was 900 ℃,the calcination time was 3 h,the ratio of liquid to solid was 5∶1,and the water immersion time was 15 min.

This article simulated three mortar systems including mineral filler⁃asphalt,mineral filler⁃emulsified asphalt residue and cement⁃emulsified asphalt residue in cold recycled mixture with emulsified asphalt. The results show that cement⁃emulsified asphalt residue mortar owns higher modulus than the other two mortars because of cement hydration. The change of modulus and phase angle is different from that of ordinary mineral powder⁃asphalt mortar and mineral powder⁃emulsified asphalt mortar, and does not change linearly monotonously with powder⁃to⁃binder ratio. At the same time, the interface adhesive ability of cement⁃ emulsified asphalt residue is similar to that of the mineral filler⁃asphalt mortar, and much higher than that of the mineral filler⁃emulsified asphalt residue mortar in a lower filler dosage. In the process of mixture production, emulsified asphalt provides the initial stability of the mixture, and cement hydration and the formation of composite mortar system are the guarantee of the final cold recycled mixture strength.