استخراج روی از خاکهای سولفیدی کم عیار بوسیله acidithiobacillus ferrooxidans
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abstract
acidithiobacillus ferrooxidans مهمترین میکروارگانیزمی است که با اکسیداسیون کانیها در خاکهای سولفیدی ارتباط دارد. در این مطالعه اکسیداسیون بیولوژیکی آسفالریت با استفاده از کشت خالص acidithiobacillus ferrooxidans انجام شد. آزمایشات استخراج بیولوژیکی در ظروف 500 میلی لیتری حاوی 270 میلی لیتر محیط کشتk 9 و 30 میلی لیتر مایع تلقیح انجام شد. 15 گرم خاک سولفیدی به ظروف اضافه شد. ظروف در انکوباتور با 180 دور در دقیقه قرار داده شدند. نتایج نشان داد که بعد از 30 روز فعالیت باکتریها محتوای zn2+ استخراج شده توسط آنها (79/64 درصد) به طور معنی داری بیشتر از شرایط بدون باکتری(11 درصد) است. همچنین نتایج نشان داد که بیشترین میزان استخراج zn2+ در طول آزمایشات استخراج بیولوژیکی، 79/64 درصد بوده است. شرایط بهینه جهت حداکثر استخراج باکتریایی، 30 درصد وزنی – حجمی خاک سولفیدی، اندازه ذرات 45 میکرون، ph 4/2 و دمای 30 درجه سانتیگراد نشان داد. این یافته ها جهت کاربردی نمودن تکنولوژی استخراج میکروبی در معادن کم عیار روی مهم است.
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Journal title:
زیست شناسی ایرانجلد ۲۵، شماره ۱، صفحات ۱۳۰-۱۳۷
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