نتایج جستجو برای: hydrometallurgical method

تعداد نتایج: 1630455  

2006
Carolyn I. Pearce Richard A.D. Pattrick David J. Vaughan

The metal sulfi des exhibit a great diversity of electrical and magnetic properties with both scientifi c interest and practical applications. These properties apply major constraints on models of the electronic structure (or chemical bonding) in sulfi des (Vaughan and Rosso 2006, this volume). The pure and doped synthetic equivalents of certain sulfi de minerals have actual or potential applic...

2015
Katsutoshi Inoue Manju Gurung Ying Xiong Hidetaka Kawakita Keisuke Ohto Shafiq Alam

Novel and environmentally benign adsorbents were prepared via a simple sulfuric acid treatment process using the wastes of astringent persimmon, a type of biomass waste, along with persimmon tannin extract which is currently employed for the tanning of leather and as natural dyes and paints. The effectiveness of these new biosorbents was exemplified with regards to hydrometallurgical and enviro...

2006
Kazuya Koyama Mikiya Tanaka Jae-chun Lee

A novel energy-saving hydrometallurgical recovery process for copper from electronic scrap employing the Cu(I)-ammine complex has been presented on the basis of a thermodynamic consideration. In order to experimentally explore the feasibility of the leaching stage in this process, the copper leaching behavior from a printed circuit board (PCB) in ammoniacal alkaline solutions has been investiga...

2013
Jin-Young Lee Jyothi Rajesh Kumar Ho-Seok Jeon Joon-Soo Kim

The present research paper deals with the oxidation process of molybdenum ore. The main target of the present study is the up-gradation of MoO3 from roasted molybdenum ore by a leaching process without waste generation. The most important application of hydrometallurgical processing is the leaching process of the ore and it is the primary process to make pure metal from ore. The present investi...

Journal: :Inorganics (Basel) 2023

A complex processing variant for pyrite cinders, i.e., the technogenic waste generated in production of sulfuric acid, was proposed. This method provided preliminary chemical activation initial raw materials that comprised thermal treatment with a sodium bicarbonate solution and resulted structural phase changes separate minerals. Due to activation, it possible nonferrous metals into products (...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه لرستان - دانشکده علوم پایه 1389

abstract part one: the electrode oxidation potentials of a series of eighteen n-hydroxy compounds in aqueous solution were calculated based on a proper thermodynamic cycle. the dft method at the level of b3lyp-6-31g(d,p) was used to calculate the gas-phase free energy differences ,and the polarizable continuum model (pcm) was applied to describe the solvent and its interaction with n-hydroxy ...

Journal: :Journal of hazardous materials 2005
J E Silva A P Paiva D Soares A Labrincha F Castro

In this study, a hydrometallurgical treatment involving the solvent extraction and recovery of some heavy metals from a sulphuric acid leach solution of galvanic sludge, using di-(2-ethylhexyl)-phosphoric acid (D2EHPA) and bis-(2,4,4-trimethylpentyl)-phosphinic acid (Cyanex 272), both diluted in kerosene, has been investigated. The preliminary tests revealed the necessity to remove other metal ...

2012
Abhishek Tripathi Manoj Kumar D. C. Sau Archana Agrawal Sanchita Chakravarty T. R. Mankhand

The rapid growth in the use of electronic equipments, combined with early obsolescence has contributed enormously to the generation of large quantity of electronic (e) waste. One such e-waste, the mobile phone printed circuit boards (PCBs) contain various precious metals which can be extracted by different hydrometallurgical routes. The present work deals with the recovery of gold using ammoniu...

2017
Arda Işıldar

Waste electrical and electronic equipment (WEEE) is an important secondary source of valuable metals. Particularly discarded printed circuit boards (PCB) contain high concentrations of valuable metals, varying greatly among the type of board, the manufacture year, source device, and utilized PCB production technology. Chemical hydrometallurgical processing is an efficient method to selectively ...

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