Research On The Extract Of The Molybdenum Metal From The Low Density Leach Liquid With Biosorption Method

Shandong Aluminium Corporation, in the Shandong province of China wants to extract the preious metal Molybdenum from the ineffective activator. At present a common chemical acid deposition method is applied tentatively. However, the overall reecycle rate is only 65%～70% and has a lot of impurities. Under the trust of the relative party we try to find out an high efficient biosorption technique to extract the metal Molybdenum from the ineffective activator through the experiment..In this paper six kinds of bacteria are cultivated and seperated from the activiated sludge. We have studied their biosorption capacity for the metal Molybdenum, and the numbered 1# and 2# bacteria have the best potential. Therefore we have especially resrearched the two bacteria biosorption property for the metal Molybdenum, which includes biosorption kinetics laws, biosorption balance laws and desorption laws etc. Meantime we have studied the affection laws of the exterior conditions on the biosorption capacity and acquired the most suitable conditions on the biosorption. Thus this paper can afford some instructions and theoretical bases on the practical industrial application of the biosorption technique into the recycle of precious and heavy metals from the wastewater or waste liquid.The biosorption balance experiment shows that Freundlich model can best describe the biosorption balance of the metal Molybdenum on the two bacteria. The linear regression coefficient is up to 0.96. The biosorption kinetics experiment shows that the biosorption course of the metal Molybdenum on the two bacteria is composed of two stage. The Lagergren first-order biosorption rate model can best describe the biosorption kinetics of the metal Molybdenum on the 2# bacteria. The fitting relative coefficient is 0.9753. The 0.1mol/LNaOH solution is the effective strippant. After the pre-treatment of the bacteria with the 1mol/L NaOH solution, the biosorption capacity drops sharply.The pH value and the temperature are the main two factors influnce the biosorption capacity. With the rise of pH value the biosorption capacity of the two bacteria increases. Under the laboratory circumstances the most suitable pH value of the biosorption is 7.0- 7.2. Temperature affects the biosorption of the metal Molybdenum obviously. 30℃-50℃is the ideal environment for the two bacteria. The co-exist metal ions affect the biosorption, too. The organic nutriment has no promotion effect on the biosorption.