نتایج جستجو برای: ore tailing
تعداد نتایج: 11501 فیلتر نتایج به سال:
چکیده ندارد.
تشکیل زهاب اسیدی معدنی و آلوده کننده های همراه با آن یکی از بزرگترین مشکلات محیط زیستی به شمار می رود. زهاب اسیدی عمدتا تابعی از کانی شناسی سنگها و در دسترس بودن آب و اکسیژن است. به دلیل تأثیر کانی شناسی و فاکتورهای دیگر بر روی پتانسیل تشکیل اسید، مقدار و ترکیب شیمیایی آن از یک محل به محل دیگر بسیار متغیر است. عملیات استخراج و فرآوری با افزایش سطح تماس کانیهای سولفیدی و نرخ واکنشهای اکسیداسیون،...
The present work was planned to evaluate the phytoextraction of metal mine tailings, Sarcheshmeh copper mine, SE of Iran, by the endemic plant species Medicago sativa L. (Alfalfa). In this pot experiment, we investigated the effects of seven amendments on the growth of alfalfa and uptaking metals from the mine tailings and stream sediment of tailing dam surface. The mean metal concentrations in...
High water usage is necessary while ore passes through the many stages of a mineral processing plant. However, dewatering system filters final pulp product to remove water, which reutilized in previous processes. This step fundamental reducing fresh new consumption. Usually, several tanks, pumps, and form system—any failure or shutdowns from those components disbalance flow. The waste tons prod...
UNLABELLED PURPOSES AND APPROACH: Acute castration and/or tailing distress in lambs has been examined extensively during the last decade. At least 59 different approaches to assessing and alleviating this distress have been reported so that the literature is quite complex. The purpose of this paper is to provide an overview of the literature on castration and/or tailing distress, where the dist...
BACKGROUND Phytoextraction is an environmentally acceptable and inexpensive technique for mine tailing rehabilitation that uses metallophyte plants. These plants reduce the soil trace metal contents to environmentally acceptable levels by accumulating trace metals. Recently, whether more trace metals can be removed by species-rich communities of these plants received great attention, as species...
3' uridylation is increasingly recognized as a conserved RNA modification process associated with RNA turnover in eukaryotes. 2'-O-methylation on the 3' terminal ribose protects micro(mi)RNAs from 3' truncation and 3' uridylation in Arabidopsis. Previously, we identified HESO1 as the nucleotidyl transferase that uridylates most unmethylated miRNAs in vivo, but substantial 3' tailing of miRNAs s...
Iron ore pellets are sintered, centimetre-sized spheres of ore with high iron content. Together with carbonized coal, iron ore pellets are used in the production of steel. In the transportation from the pelletizing plants to the customers, the iron ore pellets are exposed to different loading situations, resulting in degradation of strength and in some cases fragmentation. For future reliable n...
A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex ore bodies as the less refractory ores become depleted. Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves. The selection of options to treat a specific ore is significantly impacted by factors such as mineralog...
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