A method for automatic rarefaction stabilization of pulp in a mill milling sand of a classifier by determining and feeding water to the sand chute of a classifier and neck of a ball mill, measuring process parameters, in particular the level of the pulp followed by calculating the actual value from of adjustable value by measured and averaged parameters, and specified constants, its comparing it with a predetermined ore/water ratio, and single loop water flow control with accuracy determined by the accuracy of measuring devices and tools for setting constants. Automatic control is combined - first by discrete changes of water flow in the sand chute of a classifier within the established margin of error of ore/water ratio, which determines the number of degrees of discrete fixed flows of water supply, by the level of pulp and difference between specified and actual ore/water ratio, and then by continuous controlled water flow into the neck of a ball mill in accordance with a time-variable problem, which is formed as a flow rate according to the relationThe level of the pulp and further its excess pressure are defined in the receiving device of a spiral feeder with the same or common converters followed by calculation of the actual ore/water ratio according to the formula.
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