IT IS WIDELY accepted that worn shells have a negative effect on pol extraction but there are few research reports on the subject. This paper presents research results where wear of roll shells and extraction performance at Manuelita Mill are related using historical data of the milling station and extraction models based on reabsorption coefficient. Some tools that have been developed and a list of economic model components are presented. It was concluded that wear of roll shells is a main factor that affects the performance of milling units. The estimation of loss on brix extraction is between 3.76% and 11.58% for a first mill unit.
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