Browsing by Author "Lounis, Azzeddine"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Analysis Of Impurities Of Nd-fe-b Magnet By Nuclear Method And Recovery By Precipitation Chemical Of Nd And Pr Rare Earths(Oum-El-Bouaghi University, 2017) Cheraitia, Kamel; Lounis, Azzeddine; Mehenni, MohamedAbstract The products of the new information and communication technologies (NTIC), whose life often not exceed three years, became consumables to the computer image and other waste that contains neodymium and praseodymium (rare earths). In this field of analysis of impurities, treatment and recycling of waste, we propose the recovery of elements such as neodymium and praseodymium, from the super-magnet Nd-Fe-B, Our study provides a simple process and inexpensive. The implementation scheme of our project consists in a first step in developing a plan of experience that has been made specifically to perform the optimization of operating conditions of the precipitation process. This experimental design was inspired by a statistical technique advanced design of experiments known factorial design. The flow sheet processing of recovery begins by embrittlement in liquid nitrogen (-196C) followed by dissolution in an acidic solution and precipitation of Nd as neodymium oxalate. For characterization we used the following techniques: The neutron radiography, the neutron activation analysis(NAA), the scanning electron microscope coupled with EDX and XRD. The counting of γ spectrum shows that the purity of the precipitate is higher than 99%. Then, the thermal decomposition transforms this powder to neodymium oxide. After the reduction we obtain pure neodymiumItem Improving The Performance Of Vibratory Treatment Based On Polymeric Composite Binder(Oum-El-Bouaghi University, 2016) Rouabhi, Youcef; Lounis, Azzeddine; Babichev, A. P.The advanced technology still requires a good surface finish at a low cost. This scenario asks the industries and the scientific community to develop new finishing processes. Currently, there are many techniques and the most promising of them is the abrasive vibratory treatment (AVT). The performance of the AVT depends on the operating mode (Amplitude, oscillation frequency of the work chamber, thermal and energy parameters), devices design features and other factors, among which the central place is occupied by the functional properties of the granules, generally, based on the composites, predetermining the important role and the main task of the vibratory treatment. However, the analysis of the works in this domain shows that AVT gives good results with the right selection of granules that is the shape, the size and the composition of them, which are determined by the configuration and material of the treated parts thus shows that the functional properties of granules are not completely used. Therefore, the purpose and task of the relevant work is the intensification of the AVT process by improving functional properties and performance of abrasive granules based on a polymeric binder (PB).