The Analysis of Piofit or Loss in Ore-Draw processes and The Static Profit Index System Used for Deciding Cut-off Draw-Grade
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摘要: 放礦截止品位的選擇和資源回收率、盈利及每年精礦產量密切相關,從而影響到綜合技術經濟效果。本文僅側重討論其中的盈利指標。
文中推薦用三種盈利性指標去評價經濟效果:1)每噸報銷工業礦量盈利;2)每噸采出礦石盈利;3)利本率。從邊際效益的角度分析了邊際效益和平均盈利的關系,進而分別導出了上列諸盈利指標的極大值判據。應用這些判據和兩個盈虧轉折點,可把放礦過程劃分成幾個效益不同的區間,從而為最終選定截止品位提供經濟依據。
使用覆巖下放礦的崩落采礦法時,礦石損失和貧化的高低,極大地影響礦床開采的經濟效果。在礦床條件、崩落礦巖品位及流動特性、以及采礦方法結構參數和放礦方法一定的情況下,損失和貧化指標將主要取決于放礦截止品位的選擇。
最優放礦截止品位的選定應該滿足企業盈利性,資源回收率,以及最終產品的年生產能力等要求。考慮到盈利是企業活動效果的綜合表現,反映了損失和貧化的影響,在決策中具有重要意義,本文擬主要就盈利性指標進行初步討論。Abstract: The selection of cut-off draw-grade is closely related to the resource reco-vory, profit and annual output of concentrate, thus it is concerned with the-composite, technical-economic effect. This paper is only to discuss emphatically one of them, that is the profit index.
This paper suggests three knids of profit index to evaluate the economic effect, they are:1) the profit per ton of the write off recoverable reserve; 2) the profit per ton of recovered orc; 3) profit-cost ratio. The relationship between marginal benefit and mean profit is analyzed from the point of view of marginal benefit, so that the criteria of maximum value of the above mentioned profit indexes can be deduced respectively. To use these criteria and the two break-oven points, the draw process can be divided into severed section and each of them has diffeient benefit leved, which provide economical bisis for final dcsision of cut-off draw-grade. -
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