نوع مقاله : مقاله کامل پژوهشی

نویسنده

گروه مهندسی مواد و متالورژی، دانشکده فنی و مهندسی، مجتمع آموزش عالی گناباد، گناباد، خراسان رضوی، ایران

10.30501/jamt.2021.238557.1102

چکیده

در این تحقیق، رسوب­ دهی الکتروشیمیایی آنتیموان از محلول سولفیدی قلیایی مطالعه شد. اثر دما (بازه دمایی 45 تا 65 درجه سلسیوس) و زمان الکترولیز (صفر تا 6 ساعت) بر میزان بازیابی آنتیموان، بازدهی جریان و انرژی مخصوص بررسی شد. همچنین سینتیک رسوب ­دهی شیمیایی مطالعه و از نتایج آن برای توسعه الگوی ریاضی استفاده شد. نتایج نشان می ­دهد که افزایش دمای الکترولیز باعث کاهش بازیابی آنتیموان، کاهش بازدهی جریان و همچنین افزایش مصرف انرژی می ­شود. آزاد شدن گاز هیدروژن در کاتد در غلظت­ های پایین آنتیموان در محلول و همچنین انجام واکنش‌های ناخواسته در مجاورت آند و کاتد، باعث مصرف جریان الکتریکی می ­شود و بازدهی جریان و بازیابی آنتیموان را کاهش می ­دهد. بیشترین بازیابی آنتیموان در دمای 45 درجه سلسیوس و در 6 ساعت، 70 درصد وزنی و بیشترین بازدهی جریان در همان دما و پس از یک ساعت الکترولیز، به میزان 90 درصد به­دست آمد. مقدار انرژی مصرفی برای رسوب یک کیلوگرم آنتیموان در بازه دمایی آزمایش­ ها، 35/1 تا 28/2 کیلووات‌ ساعت بود. همچنین، کمترین میزان انرژی مصرفی، مربوط به دمای 45 درجه سلسیوس بود. بررسی‌های سینتیکی نشان م ی­دهد که معادله اویلر- اروفیف می­ تواند با دقت بالایی در تخمین میزان بازیابی آنتیموان برحسب زمان و دما استفاده شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Effect of Temperature on the Electrowinning of Antimony from Alkaline Sulfide Solution

نویسنده [English]

  • seyyed mohsen Moosavi Nejad

Department of Metallurgy and Materials Engineering, Faculty of Engineering, University of Gonabad, Gonabad, Khorasan Razavi, Iran

چکیده [English]

In this research, the electrodeposition of antimony was studied in alkaline sulfide solution. The effect of time and temperature of electrowinning step on antimony recovery, current efficiency and specific energy in the temperature range of 45-65 °C for 0-6 h was investigated. Furthermore, the kinetics of electrodeposition was studied, and the results were used in developing mathematical model. Results show that increasing the temperature of electrowinning decreases antimony recovery, current efficiency and increases energy consumption. Hydrogen evolution at the cathode at low concentration of antimony in the solution and occurrence of harmful reactions at the electrodes lead to energy consumption and decrease current efficiency and antimony recovery. Maximum antimony recovery was 70 % after 6 h electrodeposition at 45 °C and maximum current efficiency was 90 % after one hour electrodeposition at the same temperature. The energy consumed per one kilogram of deposited antimony in the temperature range of the experiments was in the range of 1.35-2.28 kWh. Minimum value of consumed energy was achieved at 45 °C. The kinetic investigation shows that Avrami- Erofeyev equation can be used for prediction of antimony recovery with high accuracy.

کلیدواژه‌ها [English]

  • Antimony Recovery
  • Electrodeposition
  • Alkaline Sulfide Solution
  • Temperature effect
  • Kinetic
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