Copper / Nickel Plating Wastewater Treatment And Separation Of Research

In this thesis,the disposal of acidic containing copper electroplating wastewater which remove exterior feculency of plated metal before electroplating in Guiyang 083 systems Yuguang subsidiary company plating department was investigated.The disposal technics "neutralizing -flocculating and precipitating - acid lixiviating" was advanced, and influencing factor of that technics was studied:Experimental study by the Canadian base content, pH, temperature and stirring time and standing time of precipitation and in the process of precipitation, be in the best experimental conditions for the reaction conditions: room temperature, an increase of 20% sodium hydroxide solution to the transfer of electroplating wastewater pH=8.5, stirring for 4 min. Precipitation will be static and hierarchical. After the experimental process, the precipitation of copper was up 99%, treated wastewater discharges of copper ion content below national standards, the maximum concentration of effluent discharge (≤1mg/L);The comparison of the three organic polymer flocculant polyacrylamide (PAM), Sodium Polyacrylate (PAAS) and polyvinyl alcohol (PVA) and in precipitation electroplating wastewater flocculation and sedimentation effect, Experimental choice sodium poly-acrylate (PAAS) as a treatment of acid copper electroplating wastewater flocculant. When the copper electroplating wastewater ion concentration 366.7mg/l, After takes in the 400ml alkalizing and the precipitation treatment experimental water sample, 0. 5g/l PAAS 1.5ml can achieve better flocculation and sedimentation effect;Alkaline copper precipitation wastewater after filtration, and then sulfuric acid leaching to recover copper. Experimental study of the increase in volume of concentrated sulfuric acid leaching time, leaching temperature, the ratio of liquid to solid on the effects of leaching, leaching of copper reached more ideal conditions : room temperature, From the experimental per gram of dry Preparation electroplating sludge 2.76g increase concentrated sulfuric acid, liquid-solid ratio of 10, the extraction time is 2 hours. Under these conditions, copper leaching rate can reach 93%.In addition, laboratory research on the preparation of copper, nickel hybrid model for liquid separation, replacement of iron, sodium sulfide precipitation choice, sodium hydroxide precipitation step-by-step and ammonia precipitation four methods of separation experiments come to step ammonia precipitation of a mixed model with the copper and nickel were separated its best effect, The precipitation of copper which was up 94.59%, nickel and the loss rate is only 2.91%; separating the solution of nickel sulphate and sodium hydroxide to adopt the precipitation, and then dissolved in concentrated sulfuric acid, concentration can be higher than pure nickel sulfate solution, evaporation, condensation, After crystallization receive good quality, industrial-grade nickel sulfate product, the main indicator of product quality in line with national standards of a category.Among the study shows : copper / nickel electroplating wastewater by the experimental program, simple operation, not only the recovery of valuable metals, and experimental process resulting from the wastewater, States would be able to meet the wastewater discharge requirements and achieved the resources and harmless purposes. In this paper, the technology program has dual economic and environmental benefits in its findings. to the practical use of chemical treatment of electroplating wastewater has some reference value and guiding significance.