Experimental Study On The Treatment Of Cu²⁺ Containing Wastewater By Sludge Steel Slag Composite Particles

In order to explore the preparation process of sludge steel slag composite particles,the removal effect of Cu²⁺in acid mine waste water,the adsorption mechanism and rule,and the best reaction conditions for Cu²⁺adsorption,the shaking adsorption experiment,scanning electron microscopy?SEM?,X-ray diffraction?XRD?and EDS energy spectrum analysis were used to carry out the experimental study by combining macro analysis with micro analysis.Through the single factor influence experiment and the orthogonal experiment,the best preparation technology of the sludge steel slag composite particles was determined as follows:the mass ratio was 6:4,the content of sodium carbonate was 6%,the baking temperature was500?and the baking time was 1h.Through SEM,XRD and other methods to characterize the structure,it could be revealed that the difference of mass ratio,content of pore forming agent,calcination temperature and calcination time would affect the pore structure inside the composite particles of sludge and steel slag,and then affect the adsorption performance of the composite particles;the more the content of pore forming agent was,the more developed the pore structure was;too high calcination temperature or calcination time was not conducive to the formation of pores.The composite particles of sludge and steel slag contain Ca-Si-O?M-Si-O?Ca-M-Si-O and other mineral phases?M for metallic elements?,that was,it existed in the form of calcium silicate compounds and minerals combined with metals.It could be seen that the composite particles of sludge and steel slag mainly precipitated in the treatment of wastewater.The adsorption of Cu²⁺by steel sludge composite particles was in accordance with Langmuir isotherm adsorption and quasi second-order kinetics model.SEM,XRD and EDS analysis of the composite particles of sludge and steel slag after the treatment of wastewater containing Cu²⁺with different concentrations showed that:the polymer containing Cu²⁺formed on the surface of sludge steel slag composite particles was fluffy;the higher the concentration of Cu²⁺in wastewater,the more Cu²⁺adsorbed on the surface of sludge steel slag composite particles,but the precipitation mainly occurred at low concentration.Through the experimental phenomenon of the treatment of Cu²⁺containing wastewater by the composite particles of sludge and bentonite,and the micro comparative analysis of XRD and EDS at different reaction time,it was concluded that the composite particles of sludge and steel slag had the synergistic effect of adsorption flocculation sedimentation in the process of Cu²⁺treatment.Adsorption experiment of optimal sludge and steel slag composite particles showed that:in100ml solution containing Cu²⁺with concentration of 100mg/L and p H of 4,added 8g/L sludge steel slag composite adsorbent and reacted for 120min under the condition of oscillation speed of80r/min,the removal rate of Cu²⁺was 94.97%and the p H after reaction was 7.17;after reaction,Cu²⁺concentration and p H met the national discharge standards,and sludge steel slag composite particles were excellent adsorbents for AMD water treatment.The paper had 44 figures,16 tables and 62 references.