حذف آرسنیک از محلول لیچینگ باردار با استفاده از روش انعقاد الکتروشیمیایی

نوع مقاله : علمی و پژوهشی

نویسندگان

1 گروه پژوهشی محیط زیست، پژوهشگاه علوم و تکنولوژی پیشرفته و علوم محیطی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران

2 معاونت امور معادن و صنایع معدنی، سازمان صنعت، معدن و تجارت استان کرمان، کرمان، ایران.

چکیده

در مطالعه حاضر، فرآیند انعقاد الکتروشیمیایی (الکتروکواگولاسیون) در صنایع معدنی به منظور حذف یون آرسنیک از محلول لیچینگ باردار PLS)) کارخانه فرآوری مس، مورد بررسی قرار گرفته است. نمونه ها حاصل از شبیه سازی فرآیند لیچینگ و با افزودن نمک آرسنیک سه ظرفیتی (NaAsO2) تهیه گردید. تأثیرات سه پارامتر مستقل مانند pH (X1)، زمان الکترولیز (X2)، چگالی جریان (X3) با استفاده از روش سطح پاسخ (RSM) بمنظور بررسی حذف آرسنیک از محلول PLS، بررسی شد. این طرح شامل 17 مجموعه آزمایش با استفاده از سیستم الکتروکواگولاسیون می باشد. در این تحقیق، طرح آزمایش باکس بنکن در روش سطح پاسخ با سه عامل عددی در سه سطح برای بررسی اثر تعاملی متغیرهای فرآیند به منظور بررسی راندمان حذف آرسنیک از محلول لیچینگ با استفاده از روش الکتروکواگولاسیون، مورد بررسی قرار گرفت. شرایط بهینه برای فرآیند الکتروکواگولاسیون در 5/6pH:، زمان الکترولیز: 114 دقیقه و چگالی جریان الکتریکی A/m2 3/65، با راندمان حذف88/96٪ حاصل شد. نتایج نشان داد که قابلیت فرآیند الکتروکواگولاسیون به عنوان یک روش قابل اعتماد و قابل اطمینان به منظور حذف یون های فلزی بخصوص یون آرسنیک از پساب های صنایع معدنی به ویژه در کارخانجات فرآوری مواد معدنی بسیار مطلوب می باشد.
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Removal of Arsenic from Pregnant Leaching Solution Using Electrochemical Coagulation Method

نویسندگان [English]

  • Seyed Morteza Moosavirad 1
  • Ali Hasanzadeh-Sablouei 2
1 Department of Environment, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.
2 Deputy Minister of Mines and Mining Industries, Industry, Mining and Trade Organization of Kerman Province, Kerman, Iran.
چکیده [English]

In the present study, the electrochemical coagulation process (electrocoagulation) in the mining industry to remove arsenic ions from the charged leaching solution of PLS (copper processing plant) has been investigated. Samples were obtained by simulating the leaching process by adding trivalent arsenic salt (NaAsO2). The effects of three independent parameters such as pH (X1), electrolysis time (X2), current density (X3) were investigated using the response surface methodology (RSM) to investigate the removal of arsenic from PLS solution. This design includes 17 sets of experiments using electrocoagulation system. In this study, the Box-Benken test design in the response surface method with three numerical factors at three levels was investigated to investigate the interactive effect of process variables to evaluate the efficiency of arsenic removal from leaching solution using electrocoagulation method. The optimal conditions for the electrocoagulation process were determined at pH 6.50, electrolysis time: 114 minutes and electric current density of 65.3 A/m2, with a removal efficiency of 96.88%. The results showed that the ability of electrocoagulation process as a reliable method to remove metal ions, especially arsenic ions from the effluents of the mining industry, especially in mineral processing plants is very desirable.

کلیدواژه‌ها [English]

  • Pregnant leaching solution
  • Electrochemical coagulation
  • Arsenic
  • Response surface methodology
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