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Abstract
The impact of installing process control systems could be evaluated in terms of performance improvements through reduced operating costs. Since these installations impose considerable capital expenditure, the profitability of the new systems should economically be justified. Controlled variable trend was reconstructed by a combination of simple waves, which provided a means to simulate the effect of installing a control system (feedback) by removing disturbance waves with high periods (> one cycle per hour). A method was proposed to evaluate the impact of installing a control system either by a reduction of difference between target concentrate quality and operating quality (i.e., bias reduction) or by reduction of scatter of product quality (i.e., variance reduction). It was found that if an appropriate feedback control system is used at the flotation circuit of the Zarand coal washing plant, the variance of concentrate ash content could decrease from the current value of 0.38 to 0.06. Based on the predicted metallurgical improvement, the payback time of installing a conventional control system for the flotation circuit of the Zarand plant with an approximate cost of $1,000,000 was found to be two years.

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		KMPC Hemmat A Mineral Processing Digital Library
	All Years to Access Full-Text Export citations A METHOD TO JUSTIFY PROCESS CONTROL SYSTEMS IN MINERAL PROCESSING APPLICATIONS By G H Parsapour, M Maleki, S Banisi Published in International Mineral Processing Congress (IMPC) at 2012 Direct link: http://kmpchemmat.ir/pii/36830 Abstract The impact of installing process control systems could be evaluated in terms of performance improvements through reduced operating costs. Since these installations impose considerable capital expenditure, the profitability of the new systems should economically be justified. Controlled variable trend was reconstructed by a combination of simple waves, which provided a means to simulate the effect of installing a control system (feedback) by removing disturbance waves with high periods (> one cycle per hour). A method was proposed to evaluate the impact of installing a control system either by a reduction of difference between target concentrate quality and operating quality (i.e., bias reduction) or by reduction of scatter of product quality (i.e., variance reduction). It was found that if an appropriate feedback control system is used at the flotation circuit of the Zarand coal washing plant, the variance of concentrate ash content could decrease from the current value of 0.38 to 0.06. Based on the predicted metallurgical improvement, the payback time of installing a conventional control system for the flotation circuit of the Zarand plant with an approximate cost of $1,000,000 was found to be two years.