|
دانلود رایگان مقاله انگلیسی + خرید ترجمه فارسی
|
|
| عنوان فارسی مقاله: | تغییر حالت با شدت بالا و فلوتاسیون حامل ذرات ریز طلا |
| عنوان انگلیسی مقاله: | High intensity conditioning and the carrier flotation of gold fine particles |
| مشخصات مقاله انگلیسی (PDF) | |
| سال انتشار | 1998 |
| تعداد صفحات مقاله انگلیسی | 13 صفحه با فرمت pdf |
| رشته های مرتبط با این مقاله | مهندسی مواد و مهندسی معدن |
| گرایش های مرتبط با این مقاله | فرآوری مواد معدنی، متالوژی، شناسایی و انتخاب مواد مهندسی، استخراج فلزات و نانو مواد |
| مجله | مجله بین المللی فرآوری مواد معدنی (International Journal of Mineral Processing) |
| دانشگاه | گروه متالورژی، دانشگاه د آتاکاما، شیلی |
| کلمات کلیدی | تغییرحالت با شدت بالا (CHIC)، حامل شناوری، ذرات طلا |
| شناسه شاپا یا ISSN | ISSN 0301-7516/9 |
| لینک مقاله در سایت مرجع | لینک این مقاله در سایت ساینس دایرکت |
| نشریه | Elsevier |
| مشخصات و وضعیت ترجمه مقاله (Word) | |
| تعداد صفحات ترجمه مقاله | 15 صفحه با فرمت ورد، به صورت تایپ شده و با فونت 14 – B Nazanin |
| ترجمه تصاویر | ترجمه توضیحات زیر تصاویر انجام شده و اشکال و نمودارها به صورت عکس در فایل ترجمه درج شده است. |
فهرست مطالب:
چکیده
۱ مقدمه
۲ آزمایش
۱ ۲ مواد
۲ ۲ روش ها
۳ نتایج و بحث
۱ ۳ تاثیر مواد کف زا
۴ نتیجه گیری
بخشی از ترجمه:
نتایج حاصله در این مقاله، به شرح ذیل است:
تغییر حالت با شدت بالا به عنوان مرحله پیش تیمار موجب بهبود ریکاوری فلوتاسیون ذرات طلا تا 24 درصد، افزایش سرعت آن تا 2 تا 3 برابر و گرید 50 درصد خواهد شد.
نتایج حاصله را می توان با افزایش در غلظت ذرات شناور در نتیجه تجمع ذرات ریز طلا بر اساس فلوتاسیون حامل توجیه کرد. این را می توان با افزایش در سرعت فلوتاسیون حقیقی، منحنی های گرید-ریکاوری و سرعت ترکیب پایین نشان داد .
لزوم استفاده از حالت دهنده های جدید یک عامل کلیدی برای بهبود ذرات ریز و ریکاوری آن ها با فلوتاسیون کف می باشد و حالت دهنده های برشی بایستی اختراع شوند.
بخشی از مقاله انگلیسی:
been reported on in the past (Trahar and Warren, 1976; Fuerstenau et al., 1978, 1988; Kitchener, 1978; Fuerstenau, 1980; Trahar, 1981; Sivamohan. 1990) focusing on the problems posed by very fine particles during flotation, and several alternative processes have been suggested. Most of them are based on particle aggregation, namely shear flocculation, carrier/autogenous carrier flotation, oil agglomeration and selective flocculation (Rubio and Kitchener, 1977; Kitchener, 1978; Guerra et al., 1986; Rubio and Marabini, 1987; Subrahmanyan and Forssberg, 1989; Warren, 199 1; Behl and Moudgil, 1993). The shear flocculation process is based on the selective aggregation of hydrophobic particles in systems under high turbulence. Warren has reported several studies on shear flocculation (Warren, 1975a,b, 1991; Koh and Warren, 1979a,b) and concluded that formation of aggregates takes place within a short agitation range. Thus, at high stirring speed, the formed aggregates redisperse, due to attrition and/or high shear stress. Autogenous carrier flotation (Hu et al., 1988) employs the same mineral particles which are being floated (but coarser) as carrier, and it is believed that this process proceeds like the shear flocculation with the fine particles floating attached to the larger particles (Chia and Somasundaram, 1983). Also, studies on ‘induced’ carrier flotation were carried out by Rubio and Hoberg (1993) to recover fine particles using hydrophobic polymeric spheres as carrier particles. Dianzuo et al. (1988) refer to shear flocculation, carrier flotation and emulsion flotation as main examples of hydrophobic aggregation enhancing particle capture by bubbles. The concept of shear flocculation has been extended to the conditioning stage ahead of flotation (Rubio, 1978; Bulatovic and Salter, 1989; Stassen, 1990, 199 1; Rubio and de Brum, 1994). These authors claim that the energy transferred in the conditioning stage, often expressed as conditioning time at constant impeller speed or as impeller speed at constant time, has a pronounced effect on the concentrate recovery, grade and flotation rate. The high intensity conditioning process, HIC, as it has been named, enhanced the flotation recovery of the very fine particles of copper sulfides (Bulatovic and Salter, 1989), gold, uranium oxide and pyrite fines (Stassen, 1990, 1991) and oxidized copper ores and copper and molybdenum sulfides (Rubio, 1978; Rubio and de Brum, 1994). The fact that carrier or autogenous carrier flotation may be the responsible or be operating in the overall phenomena have not being recognized. Because of that and because mechanisms involved are not very clear and data reported on the effect of HIC are still insufficient, the aim of this work is to report results on the characterization of the effect of HIC on flotation of gold fines. The effect of HIC was monitored by measurements of the ‘true’ flotation of gold fine particles, concentrate grade and recovery, degree of entrainment of values and flotation kinetics. The study has been conducted with gold fines from North Chile (Atacama), where gold is usually found in a finely dispersed form and, thus, fine grind is required in order to achieve particle liberation to enhance flotation recovery. This results in significant losses in the flotation of the ultrafine particle fractions. L. Valderrama, J. Rubio/Int. J. Miner. Process. 52 (1998) 273-285 275 2. Experiimental 2.1. Materials A representative ore sample of a copper/gold ore from Atacama (46 kg) was crushed to less than 10 mesh. Grinding was carried out in a stainless-steel ball mill (17.2 cm diameter and 22 cm length) with 55% solids by weight during 21.5 min to yield a material which was almost 65% under 400 mesh fraction (90% < 200 mesh). The mineralogical analysis showed that the ore consisted mainly of quartz, limonite, hematite, pyrite and chalcopyrite, and that gold liberation in the 200 mesh fraction was about 82%. The sample analyzed 3.7 g/t Au, 4.5 g/t Ag, 1.36% Cu, 14.15% Fe and 59.24% SiO,. Table 1 and Fig. 1 show the gold and particle size distribution in feed. Results show that about 64% of total gold is found below 38 km. 2.2. Methods Conditioning of a gold flotation feed (22% w/w>, before HIC, was first conducted in a 3-l Denver cell, during 3 min to allow collector and frother adsorption. Then the same cell was endowed with four acrylic baffles to produce the HIC under a turbulent regime. Results, expressed in kW h/m3 pulp, were obtained by stirring at a constant 1500 rpm, the pulp volume at 2 1 with conditioning time varying in the range of 25- 100 s to yield 0.5 to 4 kW h/m3 pulp inputs. The energy transferred was monitored using a voltmeter and an amperimeter. The HIC was performed in the presence of 120 g/t amylxanthate as collector and the frothers (72 g/t> studied were: pine oil, MIBC and DF-250. The medium pH varied between pH 7.5 and 7.8.
|
دانلود رایگان مقاله انگلیسی + خرید ترجمه فارسی
|
|
| عنوان فارسی مقاله: | تغییر حالت با شدت بالا و فلوتاسیون حامل ذرات ریز طلا |
| عنوان انگلیسی مقاله: | High intensity conditioning and the carrier flotation of gold fine particles |
| برای دانلود رایگان مقاله انگلیسی روی عنوان انگلیسی کلیک نمایید.برای خرید ترجمه روی عنوان فارسی مقاله کلیک کنید. | |
