Treatment Research On The Metal Nickel Ions Of Complex Composition Of The Waste

Nickel, as one of extensively used heavy metal materials is widely used in steel,nickel-based alloys, electroplating and battery and other fields.But, because of the hazards of nickel, the country increasingly stringent environmental standards for its emissions. Therefore, how to effectively remove and recover heavy metals materials,particularly nickel processing complex components, has become an important subject in environmental protection problem that must be addressed in today's industrial manufacturing. Compared with other methods, adsorption is one of the most promising treatments for the removal of metal ions because it is simple and cost-effective.This dissertation focuses on the treatment of nickel ions from waste of tungsten alloy plating launching a systematic study and the main results are listed as follows:(1) Recycling of heavy metal nickel ions from stripped mud of tungsten alloy plating.The effects of the parameters the amount of clean water, the p H, the precipitation p H values were examined. Experiments show that when the de-ionized water is 100 ml, the remaining amount of nitrate ions is in 5.48g/l and the maximum remaining amount of the highest tungsten content within the content of the bath affordable range. Adopting the volume of sulfuric acid 18 ml,leaching of nickel is highest, and dissolved faster.At an initial p H value of 4.5, the lowest remaining amount of iron came to 28.1mg/l, meetting the applicable requirements.(2) The treatment of heavy metal nickel ions from wastewater of tungsten alloy plating by graphene oxide. Different degrees of oxidation of the graphene oxide prepared by modified hummers method was used as adsorbents for removal of heavy metal ions. The effects of the parameters of p H value, contact time, Ni(II)concentration and adsorbent dosage on adsorption performance were examined. The results showed that, GO-1 adsorption of nickel ions conformed to the Langmuir isotherm model. GO-2 adsorption of nickel ions conformed to the Freundlich adsorption isotherm model fitting multilayer adsorption. The maximum adsorption capacity is 224mg/g at an initial p H value of 6 after agitating for 150 min.It was also found that Ni-pretreated GO-1 could be desorbed by HCl and the reusability of GO could still maintain above 90% of its initial capability after 3 cycles.The results suggest that GO is an effective adsorbent for nickle ions removal in water treatment.(3) The treatment of heavy metal nickel ions from wastewater of tungsten alloyplating by reduced graphene oxide.The effects of the parameters of p H value, contact time and initial concentration of Ni(II) on adsorbing ability of r GO to Ni(II) were examined.The results showed that graphene has a good adsorption performance.The maximum adsorption capacity of rGO were 54 mg/g at p H 5.0 after agitating for 90 min. It can be concluded that r GO can be used as an effective Ni(II) adsorbent.The Freundlich isotherm model matched the experimental data very well.