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经济效益是使用价值与社会劳动消耗的比值,前者是随着社会发展的需求而变化,不同产品的使用价值难以准确地比较和度量,后者就社会劳动消耗的支付形态和条件来说是千差万别的。由于设计、生产管理、客观条件等因素,对经济效益的综合评价,准确的比较分析,是一个复杂的问题。就小选厂电耗而言,处理每吨原矿的碎磨电耗比大中型选矿厂碎磨电耗高3～6千瓦·时/吨。据有关统计资料表明:小选厂碎磨电耗占整个选矿厂电耗的52～60％,一些已投产的选矿厂及研究单位正在致力于降低碎磨能耗的研
Economic efficiency is the ratio between the use value and the consumption of social labor. The former changes with the demand of social development, and the use value of different products can not be accurately compared and measured. The latter is vastly different from the payment forms and conditions of social labor consumption of. Due to factors such as design, production management and objective conditions, comprehensive evaluation of economic benefits and accurate comparative analysis are complex issues. In terms of power consumption of small plant, the power consumption per unit ton of ore crushed is 3 ~ 6kWh / t higher than that of medium and large concentrator. According to statistics, it shows that the power consumption of small dressing mill is about 52-60% of the total power consumption of dressing plant. Some ore concentrator and research institutes that have been put into production are working to reduce grinding energy consumption