N－亚硝基苯胲铵络合去除硫酸铝中铁的研究

利用络合剂N－亚硝基苯胲铵去除含铁硫酸铝溶液中的铁，考察了N－亚硝基苯胲铵用量、溶液酸度、反应时间、反应温度等因素对除铁效果的影响。实验结果表明，络合剂N－亚硝基苯胲铵用乙醇-水复合溶剂（体积比为1∶3）配制、用量（以100 mL含铁硫酸铝溶液计）为1.4 g、酸度（溶液中氢离子浓度）为0.5 mol/L、60 ℃条件下反应1 h，铁的去除率达到97.8 %，硫酸铝中铁质量分数为0.01%，优于HG/T 2225-2010《工业硫酸铝》Ⅱ类一等品质量指标（铁质量分数≤0.30%）。

Study on removing iron from aluminum sulfate solution using N-nitroso-phenylhydroxylamine ammonium as complexing agent

The process of removing iron from aluminum sulfate solution using N-nitroso-phenylhydroxylamine ammonium （CP） as the complexing agent was studied.The effect of CP dosage，acidity of solution，reaction time and reaction temperature on iron removing efficiency were investigated.The optimum reaction conditions were obtained as follows：the CP was dissolved by alcohol-water solution（1∶3 of the volume ratio），CP amount was 1.4 g （as 100 mL of aluminum sulfate solution containing iron），the acidic concentration（concentration of H+ in the solution） was 0.5 mol/L，the reaction temperature was 60 ℃，andthe reaction time was 1 h.Under the above mentioned conditions the elimination efficiency was 97.8%，and mass fraction of iron in aluminum sulfate was 0.01%，which was better than the quality standard stipulated in the Industrial Aluminum Sulfate （GradeⅠ，Class Ⅱ，HG/T 2225-2010）.