Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 24, No. 2 (July 2011) 181-190   

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D. Darvishi, D. F. Haghshenas, E. Keshavarz Alamdari*

                                                                                                                                                                                                           

Department of Mining, Metallurgical Engineering, Amirkabir University of Technology,
P.O Box 15875-413
Tehran, Iran

alamdari@aut.ac.ir

 

 

S. K. Sadrnezhaad

 

Department of Materials Science and Engineering, Sharif University of Technology

P.O. Box 11365-9466, Tehran, Iran

sadrnezh@sharif.edu

 

*Corresponding Author

 

 
 
( Received: January 12, 2008 – Accepted in Revised Form: April 23, 2011 )
 
 

Abstract    Effects of pH, D2EHPA, Cyanex® 302 and Cyanex® 272 on extractions of zinc, manganese and cobalt from a Zn-Mn-Co-Cd-Ni containing solution was comprehensively investigated at the room temperature. The addition of Cyanex® 302 indicated a left-shifting-effect on the extraction curve of zinc, a right-shifting-effect on the extraction curve of manganese and no effect on the extraction of cobalt. The addition of Cyanex® 272 shifted all three curves to the right. The most suitable extractant for separation of zinc from manganese was therefore 0.3–0.3 mixture of D2EHPA with Cyanex® 302 and for separation of manganese from cobalt was sole D2EHPA. The stoichiometric coefficient for the extraction reaction of zinc (whether using pure D2EHPA or a mixture made of D2EHPA with Cyanex® 272 or Cyanex® 302) was 3. It varied from 4 to 5 for manganese, when the quantity of Cyanex® 302 dissolved in D2EHPA increased from 0 to 100%. Utilizing the above results, a two stage leaching was devised to recover zinc, manganese and cobalt from a complex solution. At the first stage, a 0.6M D2EHPA extractant could recover zinc and a scrubbing reaction with organic:aqueous (O:A) ratio of 20:1 could wash-out cadmium from the raffinate. In the second stage, the leaching residue was treated with 0.6M D2EHPA for recovery of manganese. This stage was then followed by a one-stage scrubbing of cobalt with O:A ratio of 20:1.

 

Keywords    Solvent Extraction, Zn, Mn, Co, Cd, Ni, D2EHPA, CYANEX® 272, CYANEX® 302, Stoichiometric Coefficient, Organic Aqueous Solution

 

چکیده    تاثير مقداربه طور جامع در دماي محيط Zn-Mn-Co-Cd-Ni استخراج روي، منگنز و كبالت از محلول آبي حاويباعث جابجائي منحني استخراج روي و منگنز به ترتيب به چپ و راست Cyanex® بررسي شد. افزودن 302باعث جابجائي منحني Cyanex® ميشود ولي تاثيري برروي منحني استخراج كبالت ندارد. افزودن 272Cyanex® و D2EHPA ۰/۳ -۰/ استخراج هر سه فلز به سمت راست ميشود. تركيب آلي حاوي ۳ميتوان كبالت و منگنز را از D2EHPA 302 شرايط مناسب جداكردن روي را ايجاد ميكند و با بكارگيريD2EHPA خالص يا مخلوط D2EHPA هم جدا ميكند. مقدار ضريب استوكيومتري استخراج روي برايبرابر ۳ است. اين مقدار براي منگنز با تغير نسبت Cyanex® يا 302 Cyanex® با حلالهاي 272از ۰ تا ۱۰۰ % بين ۴ تا ۵ تغيير ميكند. براساس آنچه كه گفته شد بازيابي D2EHPA به Cyanex® 302D2EHPA منگنز و كبالت در دو مرحله جداگانه صورت ميگيرد. در مرحله اول با استفاده از استخراج كنندهبرابر ۲۰ به (O:A) ۰ فلز روي بازيابي ميشود و بعد از شستشوي فاز آلي با نسبت آلي به آبي /۶ M با غلظت۲۰:۱ ) ناخالصكادميوم حذف ميشود. در مرحله دوم، باقيمانده مرحله اول نيز با استفاده از استخراج كننده ) ۱۰ فلز منگنز بازيابي ميشود. با بكارگيري يك مرحله شستشوي فاز آلي با نسبت /۶ M با غلظت D2EHPA۲۰:۱ ) ناخالصفلز كبالت از محلول آلي حذف ميشود.

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