Fe3O4/埃洛石复合材料制备及其对铅锌选矿废水中有机物降解性能的研究

铅锌有色金属矿选矿废水中残留大量的有机选矿药剂,COD浓度高达165 mg/L,远超废水的国家排放标准,将其直接回用亦会对选矿指标带来不利影响.为降解废水中残留的有机药剂,使其达到排放或回用标准,通过热分解法将四氧化三铁(Fe3O4)纳米颗粒负载于埃洛石天然矿物表面,制备得到Fe3O4/埃洛石复合材料,并将其作为类芬顿...

Preparation of Fe3O4/Halloysite Composite Materials and Its Degradation Property for Organics in a Lead-zinc Beneficiation Wastewater

A large number of organic dressing agents remain in the beneficiation wastewater of lead-zinc non-ferrous metal ore,and the COD concentration is as high as 165 mg/L,which is far beyond the national discharge standard of wastewater.The direct reuse of the organic dressing agents will also bring adverse effects on the beneficiation indexes.In order to degrade the residual organic agents in wastewater and make it meet the discharge or reuse standards,Fe3O4 nanoparticles were loaded on the surface of natural mineral hallosite by thermal decomposition method for preparation of Fe3O4/hallosite composite material.The composite materials was used as a catalyst for catalytic degradation of mineral processing wastewater in Fenton-like reaction.The effects of temperature rise rate in preparation process,Fe3O4 contents,initial pH value,reaction temperature and H2O2 dosage on COD removal in mineral processing wastewater were investigated.The results showed that the best catalytic performance of the composite materials is obtained when the temperature rise rate of thermal decomposition is 2~5℃/min,and the Fe3O4 contents is 35%.Under the conditions of reaction temperature of 30℃,initial pH of 3,H2O2 dosage of 10 mmol/L and Fe3O4/hallosite composite materials dosage of 0.5 g/L,COD in lead-zinc dressing wastewater decreases from 165 mg/L to 39 mg/L,and the removal rate reaches 76.35%,realizing efficient and low-cost degradation of COD in the dressing wastewater.The dressing wastewater reaches the first-level discharge standard after purification.