Patent ID: 9486809
Filing Date: 2016-11-08
CPC Classification: B02C,G05B

Claim Text:
1. A method for grinding a coarse-ground material with a mill, the method comprising: providing a continuous input mass flow to the mill including at least the coarse-ground material and a fluid; grinding the coarse-ground material in the mill into fractured material of a desired size; estimating a mass flow of the fractured material exiting the mill based at least on an amount of fluid exiting the mill; using a process model based on power balance equations having characteristic process variables for ascertaining a status of the mill, a change in an energy content of a mill mass and of masses of a content of the mill in each case corresponding to a difference formed from energy inflow and energy outflow; additionally using a process model based on mass balance equations having mass flows as characteristic process variables for ascertaining the status of the mill, a change in the content masses of the mill in each case corresponding to a difference formed from mass flows into and mass flow out of the mill; measuring characteristic process variables, the measurements being taken outside the mill; estimating respective characteristic process variables by inserting the measured values into a power balance equation having respective mass flows on the assumption that the other process variables in each case are known or can be ignored; and controlling the mill by means of the estimated characteristic process variables.