افغانستان، پس از سال‌ها جنگ و نزاع، در سال ۲۰۲۱ شاهد بازگشت «امارت اسلامی» به قدرت بود. این رویداد به عنوان یک تحول سیاسی عمده در تاریخ افغانستان محسوب می‌شود و تأثیرات عمیقی را در داخل و خارج از کشور به همراه داشته است.
2023. TLDR. The microbial diversity and specific mechanisms of bioleaching for metal recovery, an eco-friendly and cost-effective alternative to conventional hydrometallurgical and pyrometsurgical methods, uses microorganisms and their metabolites to extract metals from unwanted metal-bearing materials are reviewed. …
Bioleaching is the metal-extracting practice from sulfides and/or iron-containing ores by means of microorganisms. It is a specified biohydrometallurgical approach in which either the metabolic activities or microbe's products are used to convert insoluble compounds into soluble form, which can then be recovered later [].Biological …
Semantic Scholar extracted view of "Bioleaching of iron stained silica sand" by A. Bahaj et al.
در فرهنگ لغت آبادیس - برای مشاهده کلیک کنید ... مترادف بررسی: ... دیکشنری آبادیس شامل بخش هایی نظیر دیکشنری به زبان های مختلف از جمله انگلیسی، فارسی، عربی و همچنین بیست دیکشنری تخصصی با تلفظ ...
Progress has been made in understanding and developing bioleaching of copper from primary copper sulfide minerals, chalcopyrite, covellite, and enargite, which point to low oxidation–reduction potential in concert with thermophilic bacteria and archaea as a potential key to the leaching of these minerals. This review presents developments …
There is considerable interest today in applying thermophiles to bioleach chalcopyrite in stirred tank reactors and in bioheap leaching. Moderately thermophilic iron- and sulfur …
@article{Xia2008SingleAC, title={Single and cooperative bioleaching of sphalerite by two kinds of bacteria—Acidithiobacillus ferriooxidans and Acidithiobacillus thiooxidans}, author={Lexian Xia and Jianshe Liu and Li Xiao and Jia Zeng and Bang-mei Li and Mei-mei Geng and Guan‐zhou Qiu}, journal={Transactions of Nonferrous Metals Society of ...
Mechanism of heterotrophic bioleaching. Organic acids primarily use two mechanisms to mobilize and leach metals from soil: acidolysis and complexolysis ().Acidolysis is an indirect leaching process in which oxygen atoms coating an insoluble metal compound are protonated and made soluble by organic acid (Glombitza and …
Chalcopyrite bioleaching in stirred tanks is on the verge of commercialization. Commercial applications of biohydrometallurgy have advanced due to favorable process economics and, in some cases, reduced environmental problems compared to conventional metal recovery processes such as smelting. Process development has included recognition of the ...
The dominance of either At. Bioleaching of metal sulfides is caused by astonishingly diverse groups of bacteria. Today, at least 11 putative prokaryotic divisions can be related to this phenomenon. In contrast, the dissolution (bio)chemistry of metal sulfides follows only two pathways, which are determined by the acid-solubility of the sulfides: the thiosulfate …
به‌منظور بررسی ارتباط بین مصرف انرژی و بهبود تکنولوژی،تابع تولید کاب داگلاس که در آن انرژی،نیروی کار و سرمایه‌ی متغیر مستقل هستند،را درنظر می‌گیریم.می‌توان نشان داد چون لازمه‌ی تولید ...
در این بخش از مقاله، به بررسی پیشرفت‌ها و چالش‌های موجود در استفاده از هوش مصنوعی در پزشکی می‌پردازیم. یکی از پیشرفت‌های قابل توجه در استفاده از هوش مصنوعی در پزشکی، تشخیص بیماری‌ها است.
KEY POINTS: • Bioleaching of copper sulfide ore deposits is producing less copper today • Biooxidation of refractory gold ores is producing more gold than in the past • Available …
The global transition to a circular economy calls for research and development on technologies facilitating sustainable resource recovery from wastes and by-products. Metal-bearing materials, including electronic wastes, tailings, and metallurgical by-products, are increasingly viewed as valuable resources, with some possessing …
a) At very low pH. b) At very high pH. c) At low pH. d) At high pH. View Answer. 7. Microbes that exhibit a low tolerance or have become adapted to low concentrations of soluble heavy metals in the leach suspension should be selected for bioleaching. a) True. b) False.
The time-courses for dissolution dosage of Co and Li, the pH and ORP value in three bioleaching systems are presented in Fig. 2.The dissolution concentration of Co in S + FeS 2 system (1068 mg/L) was higher than that in S system (866 mg/L) or FeS 2 system (989 mg/L) after 5 d of bioleaching; while Li exhibited the highest bioleaching …
The catalytic influence of Sulfolobus metallicus in the bioleaching of pure chalcopyrite at 70° C and pH 1.5 was studied in shake flask experiments. In order to evaluate separately the influence of planktonic and attached cells on the catalytic process, in some experiments the microorganisms were prevented from reaching chalcopyrite surface by keeping them …
یکی از موضوعات مهم در مورد دانشآموزان، بررسی پیشرفت تحصیلی آنها و عوامل مؤثر بر این پیشرفت است. از برجستهترین عواملی که در پیشرفت تحصیلی دانشآموزان نقش ویژهای دارد، معلمان هستند که میتوانند با کاربرد روشها و ...
The present review describes the historical development and mechanisms of bioleaching. Recent development has shown commercial application of the process and, concurrently, details pertaining to the key microorganisms involved in these processes have been described. Bioleaching of metal sulfides is caused by diverse groups of bacteria. The …
محقق در این مقاله از روش کتابخانه ای با استفاده از ابزار فیش برداری اقدام به جمع اوری اطلاعات و داده های لازم کرده است. هدف از نوشتار حاضر بررسی نقش و تاثیر بازی در پیشرفت تحصیلی دانش آموزان ...
لذا این مطالعه با هدف تعیین رابطه بین سبک های هویت و انگیزه پیشرفت در دانش آموزان دوره متوسطه شهرستان ساری انجام شد. مواد و روش ها: پژوهش حاضر توصیفی از نوع همبستگی است. جامعه آماری آن را ...
There have been discoveries of newly identified acidophilic microorganisms that have unique characteristics for effective bioleaching of sulfidic ores and …
درجه علمی در دسته‌بندی سابق وزارت علوم: علمی-پژوهشی. نویسندگان: مهدی رضایی. منبع: تحقیقات حسابداری و حسابرسی تابستان 1397 شماره 38. کلید واژه ها: حسابداری بخش عمومی موانع پیشرفت حسابداری بخش ...
تصفیه زیستی. تصفیه زیستی (به انگلیسی: Bioleaching) به عملیات استخراج فلزات از سنگ معدن با استفاده از موجودات زنده گفته می‌شود. میزان آلاینده‌هایی که در این روش تولید می‌شود بسیار کمتر از شیوهٔ ...
The second section of the mini-review will focus on new applications of microbial processes to mineral extraction, including (a) in situ recovery, (b) reductive …
Recent sustainable trends for e-waste bioleaching. Mohammed Sami Al Sultan, B. Benli. Published in Physicochemical Problems of… 2 June 2023. Environmental Science. For the past few decades, the electronic and electrical waste have been accumulating and piling on our lands and aside from posing some serious threat on our environment and our ...
Bioleaching by heterotrophic bacteria like Cellulosimicrobiumfunkei was shown for leaching gallium arsenide (GaAs) from a semiconductor (Scheper, 2007). 4.2. Mechanism of bioleaching by microorganisms. Many literatures describe two basic mechanisms of bioleaching that are direct/.contact mechanism and indirect/non-contact …
هدف اصلی این پژوهش بررسی فناوری نوین در حوزه فناوری اطلاعات و تأثیر این فناوری ها در حوزه یادگیری به ویژه آموزش الکترونیکی می باشد. پیشرفت های فن آوری اطلاعات و ارتباطات طی سال های اخیر ...
Key points • Bioleaching of copper sulfide ore deposits is producing less copper today • Biooxidation of refractory gold ores is producing more gold than in the …