Research On Experiment Of Mine Wastewater Treatment With DTCR-2

With industrial development, the demand for mine resources is increasing, theheavy metal pollution during the excess mine exploitation is really worrisome. Heavymetal pollution incidents become the one of the most concerned public events againand again, issuing for in the prevention of the heavy metals pollution, nationalformulates the "Integrated Control of Heavy Metal Pollution in " second five "plan"in2011, it will focus on the prevention of cadmium, chromium and other heavymetals. In general, the treatments to the teavy metals wastewater are neutralizeprecipitation, sulfide precipitation, adsorption and ion exchange methods. Either fromthe treatment effects, product stability or economic terms, these methods are notperfect, so it is necessary to explore the simple, practical and economical processingtechnology. This paper research contents and results are as follows:During the treatment processing of the simulated mine wastewater with DTCR-2,it found that adding Polyaluminium Chloride will introduce Al3+and optimizing theoptimum operating conditions in the treatment of low concentrations of minedrainage with the DTCR-2are as follows: pH value is about5.5, adding the volumeof1V%DTCR-2is0.8mL at room temperature, PAM to5mg/L, stirring time is5minand the reaction time is15min，removal rate of Cu2+、Zn2+、Pb2+、Cd2+and Cr3+is99.01%、98.61%、98.18%、98.44%and99.48%, respectively. Selection of DTCR-2on five metal ions are Cr3+> Pb2+> Cu2+> Zn2+> Cd2+. Through the processing of asingle metal wastewater, it can be determined that the optimal dosage of DTCR-2,and results that it is beneficial for the removal efficiency to Cu2+, but it is inhibited tothe removal of Zn2+, Pb2+, Cd2+and Cr3+,when comparing with the high removalefficient about DTCR-2dosage in mixed waste removal.Comparing the maximum leaching quantity and acid-base stability experiment ofthe DTCR-2capture products and the NaOH neutralize products, it is found that theformer is far littler than the latter on the leaching quantity of every metal ions, andthe former is greatly reducing the risk of secondary pollution to the environment. Itmakes up the insufficient of the traditional and precipitation methods, and summatizes that the order of a chelate stability is accordant with the order of theDTCR-2selectivity to five kinds of metal ions.Analyzed from DTCR-2and product characterization, it verified DTCR-2functional groups are N-CS2with the ultraviolet scanning; the infrared spectraindicates that DTCR-2contains N-H bond, C=S band, C-S band and N-CS2group;the S atom of C-S bond combines with the metal ions, it leads to the peak positionshifted and intensity changed, it is the role of chelating ligand; DTCR-2and theproducts were analyzed by XPS, and it is obtained that the S atom in the C-S groupsof dithiocarbamate and the N atom in the-NH/-NH2may be combined with five kindsof heavy metals, the N atom in N-CS2can be combined with Cr, it summarized thereasons of the different electivity to the different heavy metal ions on the bondingmechanism; SEM results showed DTCR-2containing an high amount of a effective Sand pushing high aggregation, and they are beneficial to combine with metal ions. Intreating wastewater, there are three kinds of mechanisms: chelated, electricallyneutralized and frame bridge.