Study On The New Process And Mechanism Of Treatment And Reuse From Shizhuyuan Tungsten Polymetallic Mineral Processing Wastewater

Mineral processing wastewater is an important part of the mine wastewater,contains a lot of flotation reagents,heavy metal ion and suspended solid pollutants and other pollutants.It is caused by the mining area environment pollution.And mineral processing wastewater treatment and reuse is strong measures to solve the mine wastewater pollution and the important premise to realize clean production,and it accord with national energy-saving emission reduction policies.In this dissertation,mineral processing wastewater from Shizhuyuan tungsten polymetallic is studied as the research object.To carry out the research work: wastewater by coagulation precipitation treatment and reuse to different flotation process?sulfide ore,tungsten and fluorite?,the influence of water quality of sulphide ore flotation,catalytic oxidation method and treatment of coagulation water and reuse to sulphide ore flotation,the mechanism of catalytic oxidation degradation of collector of benzohydroxamic acid etc.Refer to the concept of“classification treatment,classification recycling”of industrial wastewater.On this basis,put forward new ideas that mineral processing wastewater by the coagulation sedimentation moderate treatment and priority reuse to tungsten and fluorite flotation,remaining wastewater by catalytic oxidation method treatment reuse to sulphide ore flotation.Study show that mineral processing wastewater by the process of lime 500g/m³+flocculant PAM1g/m³+calcium remover LT-1 50g/m³,water quality is greatly improved,reagents system of the appropriate adjustment,water can reuse tungsten and fluorite flotation,it also can reduce the part of the reagent dosage,but water reuse of sulphide ore flotation cause serious influence,the main performance that index decline of molybdenum and bismuth flotation and a large number of tungsten and fluorite loss in sulfide ore.To find out that coagulation water of sulphide ore flotation effect is not good,the effect of main factors?such as pH,calcium ion,benzohydroxamic acid,oleic acid,diethy-amino-xanthate?of sulphide ore flotation is investigated,it analysis that the main influencing factors of sulphide ore flotation is benzohydroxamic acid.Catalytic oxidation method deal with benzohydroxamic acid simulatedwastewater,the influence of removal efficiency of current intensity,initial pH,electrolyte solution type and plate spacing to deal with benzohydroxamic acid is investigated.Found that when current intensity control in 2A,initial pH of7.5,with 1g/L sodium chloride electrolyte,adjusting plate spacing of 0.5cm,the electrooxidation of 120 min,and benzohydroxamic acid removal rate can reach more than 90%.On the basis of the simulated wastewater,to carry out test of catalytic oxidation method deal with coagulation water,under the condition of control better oxidation,wastewater quality is further improved,benzohydroxamic acid residual volume is only 2.89 mg/L.And water reuse sulphide ore flotation can get the flotation indicators with considerable indicators,shows that catalytic oxidation method deal with coagulation water idea is feasible.Through the analysis that pH,COD change rule of benzohydroxamic acid degradation process,ultraviolet spectrum and HPLC-MS spectra.It shows benzohydroxamic acid structure is destroyed by catalytic oxidation method.Hydroxyl groups oxime fell from the benzene ring,some generate benzoic acid and benzoyl peroxide,benzene ring structure cracking,generate fatty acids or lipid molecule,part is oxidized to CO₂ and H₂ O.The degradation process is direct oxidation and indirect oxidation combined action result.