بررسی تاثیر مشخصات دوغاب زیستی بر تثبیت سطوح انباشتگاه های معدنی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی معدن، دانشگاه زنجان، زنجان

2 دانشیار گروه مهندسی معدن، دانشگاه زنجان، زنجان

چکیده

مقدار قابل توجهی از مواد معدنی انباشته شده در انباشتگاه‌ها در اثر وزش باد پخش شده و علاوه بر به هدر رفتن ماده معدنی، آلودگی محیط زیست را به همراه خواهند داشت. در این مقاله پتانسیل استفاده از ترسیب میکروبی کلسیم کربنات (دوغاب زیستی) در تثبیت انباشته‌های معدنی در مقابل وزش باد مورد بررسی قرار گرفته است. در این روش، اجزای ماده ناپایدار (مواد معدنی یا باطله‌های خرد و انباشته شده) با استفاده از رسوب کلسیم کربنات ایجاد شده به وسیله عملکرد باکتری اسپوروسارسیناپاستوری، به هم متصل شده و در مقابل وزش باد پایدار می‌شود. در این مطالعه انباشته‌های تهیه شده از باطله فرآیند هیدرومتالورژی کارخانه فرآوری معدن سرب و روی انگوران در مقیاس آزمایشگاهی تحت مقادیر مختلف مواد پایه دوغاب (احجام مختلف محلول باکتری، کلسیم کلرید و اوره) و در سرعت‌های متفاوت باد بررسی شد. برای طراحی بهینه الگوهای آزمایشگاهی، از روش رویه پاسخ با 5 سطح تغییر برای هر متغیر استفاده شده که منجر به انجام 31 آزمون آزمایشگاهی شد. نتایج آزمون‌ها و مدلسازی‌ها نشان داد که در حالت بدون دوغاب‌پاشی، وزش باد با سرعت تقریبی 10 متر بر ثانیه قادر به برداشت 22 درصد خاک انباشته شده در مدت زمان یک دقیقه است ،در حالی که فقط با یک مرحله پاشش دوغاب زیستی (محلول باکتری، کلسیم کلرید و اوره به میزان 56/0 میلی‌لیتر بر سانتی‌متر مربع)، مقدار برداشت خاک به 54/0 درصد وزن کل انباشته کاهش می‌یابد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the effect of biogrout component values on the stabilization of mine dump against wind

نویسندگان [English]

  • Alireza Mohammadi 1
  • Ramin Doostmohammadi 2
1 Department of Mining Engineering, University of Zanjan, Zanjan, Iran
2 Department of Mining Engineering, University of Zanjan, Zanjan, Iran
چکیده [English]

Significant amounts of minerals accumulated in depots are scattered by wind and will cause environmental pollution. The potential of microbial induced calcium carbonate (Biogrouting) is investigated in stabilization of mineral accumulations against wind. In this method, the components of the unstable geomaterials (minerals or crushed and accumulated tailings) are bonded together using calcium carbonate deposition created by the action of the Sporosarcina pasture bacteria, and will be stable against wind. In this study, laboratory scale accumulations of Leach waste from Angouran lead and zinc mineral processing plant were tested under different amounts of grout base materials (different volumes of bacterial solution, calcium chloride and urea) and different wind speeds. In order to design laboratory models, the response surface method with 5 levels of variation was used and led to 31 laboratory tests. In the following of the research, the optimal consumption values of the grout components were calculated and presented. The results of tests showed that 22% of the accumulated soil are scattered with a wind speed of 10 meters per second. This depot can be stabilized using biogrout and scattered materials can be reduced till 0.54% in one stage improvement process (under bacterial solution, calcium chloride and urea about 0.56 ml/cm2).

کلیدواژه‌ها [English]

  • Mining dust
  • Microbially induced calcium carbonate precipitation
  • Biogrouting
  • Response surface method
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