Research Of Neodymium Modified Flocculant Made Of Blast Furnace Dust And Aluminum Scrap Material

Blast furnace dust and scrap materials of aluminum are two kinds of industrial wastes slag which will have an impact on the environment due to their complicated compositions and large emission. A new kind of composite flocculant was prepared by using two kinds of industrial waste slag. This paper studied on the species distribution change of [Al+Fe] before and after neodymium modification of flocculants made of two kinds of industrial wastes and investigated neodymium modification mechanism of Nd-PAFC by testing the item removal efficiency of the treated simulated wastewater. The optimum synthesis conditions of Nd-PAFC were determined by orthogonal test, application of Nd-PAFC was used in the treatment of simulated milk wastewater in order to explore mechanism of flocculation. Conclusions as follows:(1)Results showed that alumina-iron ratio, basicity and dosage of neodymium in the flocculants had an obvious impact on the species distribution of [Al+Fe]:The content of [Al+Fe]b reached its maximum when the alumina-iron ratio was1:3; with the increase of basicity, the content increase to a maximum at the basicity of2.0; the addition of neodymium had improved the content of [Al+Fe]b, and at the optimal addition of neodymium, the content of [Al+Fe]b enhanced by4.3%. The results of structure character indicated that neodymium could promote the polymerization of hydrolysis and Al3+, Fe3+while improving the content of [Al+Fe]b.(2) Results of single factorial experiment showed that at the optimal flocculant dosage, the maximum SS removal efficiency of simulated wastewater when the alumina-iron ratio was1:1and basicity was2.0. The optimum synthesis conditions of Nd-PAFC were determined by orthogonal experiment responding to the SS removal efficiency of simulated wastewater, and the optimum synthesis conditions were that alumina-iron ratio was1:3、basicity is2.0and dosage of neodymium is0.0028mol/L flocculants. The SS efficiency of Nd-PAFC is4.47%higher than PAFC.(3) Nd-PAFC prepared under the optimal condition was applied into the treatment of simulated milk wastewater comparing with self-made PAFC. Both self-made PAFC and Nd-PAFC had played well in simulated milk wastewater. Experimental results indicated that Nd-PAFC synthesized under the optimal conditions had a higher removal effect, a better sedimentation performance and less dosage compared with self-made PAFC.The experimental results tested the theory which was analyzed in the transmission microscope (TEM).Results of Nd-PAFC indicated that Nd-PAFC had a bigger degree of graftimg than self-made PAFC, and the enmeshing-sweeping was more evidence in the process of flocculating. The Consistency experimental results and TEM’s results rich the theoretical mechanism of inorganic flocculantPreparing composite flocculant by using blast furnace dust and scrap material of aluminum finds a new way for comprehensive utilization of industrial wastes slag, meanwhile...