نوع مقاله : مقاله کامل پژوهشی
نویسنده
بخش شیمی، دانشکده علوم، دانشگاه شیراز، شیراز، فارس، ایران
چکیده
کاتالیست های بر پایه نیکل، در فرایندهای پالایشگاهی و پتروشیمی استفاده می‌شوند. این کاتالیست‌ها پس از چندین بار احیاء و استفاده مجدد، به‌صورت کاتالیست های مستعمل در طبیعت رها می‌شوند که این کار علاوه بر مخاطرات زیست‌محیطی، از نظر اقتصادی هم؛ به دلیل وجود فلز با ارزش نیکل؛ توجیه اقصادی ندارد. عموماً برای استخراج نیکل، از روش‌های هیدرومتالورژی استفاده می‌شود که سخت و گران هستند. باتوجه به کمبود قابل‌توجه معادن کانی نیکل، استفاده از این منابع ثانویه کاملاً حائز اهمیت است. در این پژوهش، امکان بازیابی نیکل از کاتالیست های مستعمل، مورد بررسی قرار گرفت. در ابتدا، این کاتالیست‌ها کک زدایی شدند و سپس تأثیر سه اسید مختلف در فروشویی نیکل، مورد مطالعه قرار گرفت. پارامترهای مختلف، از قبیل دما، سرعت همزدن، نسبت محلول به جامد، اندازه ذرات و غلظت اسید، مورد بررسی قرار گرفتند. پس از فروشویی کامل نیکل، خالص‌سازی نیکل به‌صورت رسوب‌دهی گزینش پذیر نیکل هیدروکسید انجام شد.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Optimization Study of Nickel Leaching from Used Catalysts and Investigation of Nickel Separation by Precipitation
نویسنده [English]
- Hadi Salari
Department of Chemistry, School of Science, Shiraz University, Shiraz, Fars, Iran
چکیده [English]
Nickel-based catalysts are used in refining and petrochemical processes. After being regenerated and reused several times, these catalysts are released as used catalysts in nature, which, in addition to environmental risks, are not economically viable due to the presence of the precious metal nickel. Hydrometallurgical methods are commonly used to extract nickel, which is difficult and expensive. Due to the significant shortage of nickel mines, the use of these secondary resources is quite important. In this study, the possibility of nickel recovery from used catalysts has been investigated. Initially, the cokes were removed, and then the effects of three different acids on nickel leaching were investigated. Various parameters such as temperature, mixing speed, liquid to solid ratio, particle size, and acid concentration were investigated. After the complete leaching of nickel, nickel purification was performed by selective nickel hydroxide precipitation.
کلیدواژه‌ها [English]
- Catalysts
- Ni Leaching
- Optimization
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