کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8012031 1516935 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
φ-pH diagram of As-N-Na-H2O system for arsenic removal during alkaline pressure oxidation leaching of lead anode slime
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
φ-pH diagram of As-N-Na-H2O system for arsenic removal during alkaline pressure oxidation leaching of lead anode slime
چکیده انگلیسی
In order to illustrate the thermodynamic characteristics of arsenic during alkaline pressure oxidation leaching process of lead anode slime (NaNO3 as oxidant; NaOH as alkaline reagent), the φ-pH diagrams of As-Na-H2O, N-H2O, As-N-Na-H2O systems at ionic mass concentration of 0.1 mol/kg and temperatures of 298, 373, 423 and 473 K were established according to thermodynamic calculation. The results show that the existence forms of arsenic are associated with pH value, which mainly exists in the forms of H3AsO4, H2AsO4−, HAsO42−, and As2O3 in lower pH region, while it mainly exists in the form of when pH>11.14. High alkali concentration and high temperature are advantageous to the arsenic leaching. The alkaline pressure oxidation leaching experiments display that the tendency of arsenic leaching rate confirms the thermodynamic analysis results obtained from the φ-pH diagrams of As-N-Na-H2O system, and the highest leaching rate of arsenic reaches 95.85% at 453 K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 27, Issue 3, March 2017, Pages 676-685
نویسندگان
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