مهندسی متالورژی

مهندسی متالورژی

بررسی سینتیکی سمنتاسیون یون نیکل از محلول سولفاتی روی بوسیله فوم روی نانو حفره در رآکتور غیر پیوسته

نوع مقاله : مقاله پژوهشی

نویسندگان
1 1- دانشگاه صنعتی امیر کبیر 2- مرکز تحقیقات متالورژی دانشگاه آزاد اسلامی زنجان
2 دانشگاه صنعتی امیر کبیر
چکیده
یون نیکل در فرایند تولید روی، به روش سمنتاسیون با پودر روی، از محلول سولفاتی روی حذف می شود. مصرف زیاد پودر روی باعث افزایش هزینه تولید می شود. بی شک افزایش سرعت و راندمان فرایند می تواند به بهبود فرایند کمک کند. در این پژوهش سعی شد با ایجاد فوم روی نانو ساختار دارای نانو حفره، با روش رسوب دهی الکترولیتی، فوم روی با سطح ویژه بسیار بالا تولید و از آن در فرایند سمنتاسیون استفاده شود. سطح ویژه فومهای بدست آمده که با روش BET اندازه گیری شد بین 8تا 480 متر مربع بر گرم بدست آمد. مطالعه سینتیکی سرعت سمنتاسیون با فومهای ایجاد شده در راکتور غیر پیوسته با بررسی پارامترهایی مانند دما، زمان، اسیدیته محلول، سرعت همزنی و استوکیومتری روی انجام گرفت و کاهش غلظت یون نیکل محلول با زمان مورد بررسی قرار گرفت. با توجه به نتایج بدست آمده، در دو مدل سینتیکی آورامی و هسته کاهنده تطابق بیشتری یافت شد و نهایتا مدل آورامی برای سینتیک این فرایند پیشنهاد گردید. نتایج بدست آمده کنترل به وسیله نفوذ یون از لایه مرزی را نشان داد. دما باعث افزایش سرعت واکنش بوده و انرژی اکتیواسیون7/4کیلو ژول بر مول محاسبه گردید. مشاهده شد افزایش دما و سرعت همزنی بر ضریب n معادله آورامی‌تاثیر افزایشی دارد و مقادیر n رابه ترتیب از 82/0 به 9/0 و از 73/0 به 89/0 افزایش می‌دهد.
کلیدواژه‌ها

عنوان مقاله English

Kinetic study of nickel ion cementation from zinc sulfate solution by nanoporous zinc foam in a batch reactor

نویسندگان English

Mehdi Salimi 1
Eskandar Keshavarz Alamdary 2
Seyed Mohammad Mousavi Khoee 2
1 1- Amirkabir University of technology 2- Metallurgy Research Center Islamic Azad university Zanjan Branch
2 Amirkabir university of technology
چکیده English

In the zinc production Nickel are removed from zinc solution by cementation with zinc powder. The high consumption of zinc powder lead to increased production costs. Undoubtedly, increasing the speed and efficiency of the process can help improve the process. In this study, an attempt was made to produce zinc foam with a very high specific surface area by creating nanostructured zinc foam with nano-pore structure via the electrodeposition method. Zinc foam with a very high specific surface area was produced and used in the cementation process. The specific surface area of the obtained foams, which was measured by the BET method, was found to be between 8 and 480 m2/g. A kinetic study of the cementation rate was conducted with the produced foams in a non-continuous reactor by examining parameters such as temperature, time, pH, stirring speed, and Zinc stokiometry. The decrease in the concentration of the nickel over time was investigated, and the Avrami and shrinking core models were found to have a better fit with the obtained results. Ultimately, the Avrami kinetic model was proposed for this reaction. The results indicated that control is exerted by the diffusion of ions from the boundary layer. Temperature was found to increase the reaction rate, and the activation energy was calculated to be 4.7 kJ/mol. It was observed that increasing the temperature and stirring speed has an increasing effect on the Avrami exponent n, and the values of n increase from 0.82 to 0.9 and from 0.73 to 0.89, respectively

کلیدواژه‌ها English

Nickel ion cementation
Cementation Kinetic
Zinc foam
Avrami Model
nano structure Zinc
nanoporous zinc
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  • تاریخ دریافت 26 بهمن 1403
  • تاریخ بازنگری 11 مهر 1404
  • تاریخ پذیرش 19 آبان 1404