000			03055cam a2200349 a 4500
003			EG-GiCUC
005			20250223032444.0
008			191123s2019 ua dh f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aPh.D
099			_aCai01.12.09.Ph.D.2019.Am.R
100	0		_aAmany Ali Abdelsalam
245	1	0	_aRecovery of zinc from galvanizing waste products of kandeel steel company / _cAmany Ali Abdelsalam ; Supervised Aida. L. Elansary , Ibrahim M. Ghayad , Zeinab A. Abdelaziz
246	1	5	_aاسترجاع الزنك من مخلفات الجلفنة لمصنع قنديل للصلب
260			_aCairo : _bAmany Ali Abdelsalam , _c2019
300			_a119 P. : _bcharts , facsimiles ; _c25cm
502			_aThesis (Ph.D.) - Cairo University - Faculty of Science - Department of Inorganic Chemistry
520			_aIn this study the recovery of zinc from its dross using hydrometallurgical, pyrometallurgical and electrochemical methods was investigated. In hydrometallurgical method sulfuric acid is used as a leaching reagent and the different factors affecting the leaching process were thoroughly investigated, these factors include: concentration of leaching reagent, solid/liquid ratio, temperature at which the leaching was carried out and time of leaching. The leached zinc solution was taken and used in the experiments of electrowinning of zinc. Two lead sheets were used as anodes whereas copper sheet was used as the cathode. Different current densities (30-80 mA/cm2) were tested. Fortunately, the deposit was almost 100% zinc with minute traces of Fe and Al. A small bench scale system for investigating the recovery of zinc using pyrometallurgical method was developed. The system based on the evaporation of zinc (in the dross) at 1050oC and condensing zinc vapors into pure zinc in a separate crucible. Almost pure Zn (99.95%) is obtained using this method. A pilot scale pyrometallurgical system (300 Kg) was fabricated and used for zinc recovery. The cost of this system is almost one tenth of the imported one. In the electrorefining experiments anodes were made from zinc dross whereas the cathode was aluminium. The electrolyte used was 4 M NH4Cl, 4MNH3, zinc sulfate (1.2 g.L{u2212}1 Zn ions) and gelatin at 0.1 g.L{u2212}1. At sufficiently high current (6 A) the efficiency of zinc electrorefining is largely increased. Efficiency is slightly decreased with time (2%) till 8 h and then markedly decreased at 10 h. Preparation of inorganic glasses that can be used as Þ-ray shielding materials and also preparation of pure zinc sulfate salt were achieved
530			_aIssued also as CD
653		4	_aElectrorefining
653		4	_aHot dip galvanizing
653		4	_aZinc dross
700	0		_aAida. L. Elansary , _eSupervisor
700	0		_aIbrahim M. Ghayad , _eSupervisor
700	0		_aZeinab A. Abdelaziz , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aAsmaa _eCataloger
905			_aNazla _eRevisor
942			_2ddc _cTH
999			_c75383 _d75383