Study On Preparation Of Micro-electrolytic Filler And Degradation Of Xanthate

The micro-electrolysis process based on the principle of metal corrosion is an efficient,economical,and green industrial wastewater treatment technology.It has attracted much attention in the field of environmental protection such as wastewater treatment.The micro-electrolytic filler is the essential part of micro-electrolysis technology.However,there is no standard process for micro-electrolysis filler preparation.The effect of fillers from market is also quite different.This paper takes xanthate as the degradation object.The preparation process of filler is systematically explored.The main conclusions of this paper are listed as follows:(1)The optimal preparation process of the micro-electrolytic filler is: the mass ratio of iron to carbon is 1: 1,the catalyst copper addition form is iron-loaded copper,the copper addition amount is 3 wt.%,the pore-forming agent ammonium bicarbonate content is 3 wt.%,The content of binder bentonite was 20 wt.%,the roasting temperature was 900°C,and the roasting time was 2.5 h.The macroscopic physical parameters of the iron-copper-carbon(iron-loaded copper)packing prepared under the optimal preparation process were characterized,and it was found that the porosity,water absorption,wear rate and compressive strength of the iron-copper-carbon(iron-loaded copper)packing were 63.80%,18.75%,3.97% and 1.98 MPa,respectively.XRD and SEM analysis were used to characterize the microscopic characteristics of iron-copper-carbon(iron-loaded copper)packing.XRD results showed that the main components of iron-copper-carbon(iron-loaded copper)packing were C,Fe,Cu,Si O2,and Fe2 Si O4(iron-silicate).SEM results showed that the iron-copper-carbon(iron-loaded copper)packing had rough surface and developed pore structure inside.(2)In the experiment of exploring the degradation of xanthate wastewater by iron-copper-carbon(iron-loaded copper)fillers,the optimized process conditions for the degradation of xanthate by iron-copper-carbon(iron-loaded copper)fillers are: the dosage of filler is 500 g/L,initial p H of 7,aeration amount of 0.3 L/min,reaction time of 90 min.Under above condition,xanthate degradation rate and COD removal rate are 98.97% and 87.48% respectively when the concentration of xanthate is 100 mg/L with a volume of 80 m L.When the filler is reused to the 8th time,the degradation rate of xanthate is 91.75%,and the COD removal rate is 78.48%.(3)The mechanism study of micro-electrolysis degradation xanthate indicate that the oxidation-reduction potential in the simulated wastewater gradually increases with the increase of micro-electrolysis degradation time,the p H of the wastewater can be stably maintained at about 10,and the main components of flocs produced in the micro-electrolysis process is Fe(OH)3,and no secondary pollution remains in the micro-electrolysis process.Based on the GC-MS results of the xanthate before and after micro-electrolysis,the degradation path of the xanthate is speculated.The main intermediates of the micro-electrolysis degradation of xanthate are isobutyl alcohol,diisobutyl carbonate and 3-S(1-methylethyl)methyl thiobutyrate,and the final products are CO2,H2 O and SO42-and so on.