ZHANG Dongchen;WANG Fanglue;DONG Jingshen;ZHENG Jing;QIN Huayu;CHENG Juan;FU Peng;College of Material Science and Engineering,Anhui University of Science and Technology;Beneficiation agents usually regulate the physical and chemical properties of selected minerals and flodation media,which can expand the hydrophilic-to-hydrophobic differences between valuable minerals and gangue minerals and then achieve the best separation effect.There are many kinds of beneficiation agents and the direct discharge of mineral processing wastewater which contains residual chemicals will cause serious pollution to the environment.As a new biochemical treatment method,biodegradation has many advantages,such as low lost,low energy consumption and no secondary pollution.Therefore,it is of practical significance to study high efficiency biodegradation of residual agents in mineral processing wastewater.In this paper the current biodegradable research progress of mineral processing agents,such as xanthate,aerofloat,hydroxamic acid and pine oil were reviewed.The main factors affecting the degradation and biodegradation problems of beneficiation agents were analyzed and the future research work were also forecasted.The results show that the initial concentration,p H,temperature,shaking rate,time,C/N ratio,nitrogen source and metal ions are the main factors affecting the biodegradation of xanthate.External carbon sources can promote the degradation of xanthate.CS2,ROCSSH and mono-thiocarbonate are the main degradation products of alkyl-xanthate,accompanied by a few oil droplets of double-xanthate,which belongs to the first-order enzymatic degradation kinetics.The intermediate product of xanthate decomposition is xanthate peroxide.The analysis concluded that additional carbon sourses can promote the degradation of aniline aerofloat.Hydroxamic acid collectors are a first-order reaction kinetics.Besides,factors influencing the degradation of pine oil include p H,inoculation amount,temperature,shaking speed,initial concentration,time,etc.In view of the main problems about biodegradation of mineral processing agents,the future work should imitate the biotechnological means of similar fields to screen highly efficient degradation strains.The research on degradation mechanism should be deeply studied and new biodegradable strains should be constructed by genetic engineering at the molecular level.Meanwhile,the development of biodegradation equipment should be accelerated.
2019 01 v.25;No.119 [Abstract][OnlineView][HTML全文][Download 1982K]