بررسی تاثیر آمونیاک بر انحلال و جذب طلا در فرآیند سیانوراسیون کانسنگ حاوی مس و طلا

نوع مقاله : علمی-پژوهشی

نویسندگان

1 کارشناسی ارشد، گروه مهندسی معدن، دانشگاه تربیت مدرس، تهران

2 دانشیار، گروه مهندسی معدن، دانشگاه تربیت مدرس، تهران

3 کارشناسی ارشد، سرپرست کارخانه شرکت صنعتی و معدنی طالی توزالر، زنجان

چکیده

وجود مس اکسیدی در کنار طلا، موجب افزایش میزان مصرف سیانور در فرآیند سیانوراسیون و کاهش جذب طلا بر روی کربن و مشکلات عدیده در فرآیندهای پایین‌دستی الوشن، الکترووینینگ و ذوب می‌شود. در پژوهش حاضر، مطالعه افزایش بازیابی انحلال طلا و جذب انتخابی آن بر روی کربن فعال با استفاده از افزودنی آمونیاکی و بررسی تاثیر عوامل مختلف مانند نوع افزودنی آمونیاکی، تغییر سیستم برخورد طلا با کربن از CIL به CIC و افزودن آب‌اکسیژنه و سیانور به محلول فیلتر شده در مرحله جذب در دستور کار قرار گرفت. یافته‌ها نشان داد اضافه ‌کردن نشادر یا آمونیاک به محلول سیانوراسیون، در نمونه با عیار مس بالا (یک درصد مس) و در نمونه با عیار مس متوسط (نیم درصد مس) موجب افزایش به ترتیب حدود 60  و 30 درصدی بازیابی انحلال شده است. همچنین بازیابی جذب طلا بر روی کربن فعال در خاکی با عیار بالای 5/0 درصد مس از حدود 25 درصد در طی فرآیند CIL معمولی به حدود 100 درصد در طی فرآیند سیانوراسیون آمونیاکی به صورت CIC شد. نتایج نشان داد که آمونیاک مایع نسبت به نشادر، تا 10 درصد بازیابی انحلال بیشتر و تا 3 درصد بازیابی جذب بالاتری را ایجاد می‌کند، در حالی که مصرف سیانور را به نصف و میزان جذب مس بر روی کربن را تا یک سوم کاهش می‌دهد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

An Investigation of Ammonia Effect on Dissolution and Recovery of Gold in Cyanidation Process of Copper-Gold Ore

نویسندگان [English]

  • S. Zolghadry Hesary 1
  • M.R. Khalesi 2
  • F. Ghasemifard 3
1 M.Sc., Dept. of Minerals Processing, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran
2 Associate Professor, Dept. of Minerals Processing, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran
3 M.Sc., Tuzlar Industrial and Mining Company, Zanjan, Iran
چکیده [English]

The presence of copper oxide next to gold increases the consumption of cyanide in the cyanidation process, reduces the absorption of gold on carbon, and causes many problems in the downstream processes of elution, electrowinning, and smelting. In the current research, increasing the recovery of gold dissolution and its selective adsorption on activated carbon using ammonia additive and the effect of different factors such as the type of ammonia additive, changing the system of contact of gold with carbon from CIL to CIC, and adding hydrogen peroxide and cyanide to the filtered solution were studied. The findings showed that adding ammonium chloride or liquid ammonia to the cyanidation solution, in the sample with high copper grade (1% copper), and in the sample with medium copper grade (0.5% copper), increased the dissolution recovery by 60% and 30%, respectively. Also, the recovery of gold adsorption on activated carbon in sample with a grade of 0.5% copper increased from about 25% during the normal CIL process to about 100% during the ammonia cyanidation process in the form of CIC. Results showed that liquid ammonia provides up to 10% higher dissolution recovery and up to 3% higher absorption recovery compared to ammonium chloride, while reduces the consumption of cyanide by half and the amount of copper absorption on carbon by a third.

کلیدواژه‌ها [English]

  • Cyanidation
  • Ammonia
  • Gold-copper ore
  • Absorption
  • Activated carbon
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