IJE TRANSACTIONS A: Basics Vol. 31, No. 1 (January 2018) 173-180   

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M. Jamshidi and M. Osanloo
( Received: November 12, 2017 – Accepted in Revised Form: November 30, 2017 )

Abstract    In multi-element deposits, different blocks are blended together to create a product with a predetermined quality. Generally, blending aims to obtain a special quality and quantity based on determining the processing plant or customer needs. However, blending causes different products based on the deposit properties. Thus, a block is blended with others to create one of many possible products. The present study aims to develop a mixed integer programming model for the production scheduling of iron ore mines. The model can consider different destinations for mine blocks. Each destination has its own specifications for the main element (Fe) and other existing elements such as sulfur and phosphorous. For this purpose, ten different scenarios were evaluated to investigate the effect of multiple products on production scheduling and Net Present Value (NPV) of the related project. Among the four selected scenarios, the mine was scheduled based on single product while multiple products were considered in scheduling in other scenarios. Based on the results, the maximum NPV in scenarios with multiple products is approximately 15% higher than that of the single product scenarios.


Keywords    Iron ore, Blending, Multiple product, Production scheduling, MIP


چکیده    در معادن چند عنصری، بلوک¬های مختلف با یکدیگر مخلوط می¬شوند تا یک محصول با کیفیت مشخص حاصل شود. به طور معمول، اختلاط بلوک¬هاباهدفرسیدن به یک کیفیت و کمیت تعیین شده که بر اساس نیاز کارخانه فرآورییا نیازهای مصرف¬کنندگاناستانجاممی¬شود. این در حالی است که با انجام اختلاط می¬توان با توجه به خصوصیات ذخیره، محصولات مختلفی تولید نمود و ترکیبیک بلوک با بلوک¬های دیگر می¬تواند محصولات متنوعی را فراهم نماید. در این مقاله، یک مدل برنامه¬ریزی عدد صحیح مختلط برای معادن سنگ آهن ارائه شده است که در آن مقاصد مختلفی برای محصولات و بلوک¬های ماده معدنی در نظر گرفته می¬شود. هر یک از این مقاصد دارای مشخصات تعریف شده-ای برای عنصر اصلی (آهن) و سایر عناصر همراه نظیر گوگرد و فسفر هستند. برای این منظور، ده سناریوی مختلف در نظر گرفته شده تا تاثیر مقاصد چندگانه در برنامه¬ریزی تولید و ارزش خالص فعلی پروژه، بررسی شود. در چهار سناریو، تنها یک مقصد برای محصولات معدنی در نظر گرفته شده و در شش سناریو، مقاصد چندگانه در برنامه¬ریزی تولید وارد شده است. بر اساس نتایج حاصل، ارزش خالص فعلی بیشینه در مقاصد چندگانه، حدود %15 از بیشینه ارزش خالص فعلی در حالات تک محصولی بیشتر است.


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