A liquid molten slag dry-type centrifugal granulated slag particle size control method based on a liquid molten slag dry-type centrifugal graining system, the liquid molten slag dry-type centrifugal graining system comprising a temperature control unit, a flow control unit and a granulator control unit; the temperature control unit is used for controlling high-temperature molten slag inside a liquid melting buffer storage device to be maintained in a set temperature range and controlling the temperature of outflow molten slag from the buffer storage device to be maintained in a set temperature range; the flow control unit is used for controlling the flow rate of the high-temperature outflow molten slag from the buffer storage device to be in a set range and guaranteeing the stability of the flow rate; and the granulator control unit is used for controlling a granulator to operate smoothly. The granulated slag particle size control method can prevent reduction of conversion rate of glass bodies due to overlarge granulated slag particles, prevent wall adhesion of the granulated slag particles and low conversion rate of the glass bodies due to over-small granulated slag particles, control the particle size of the granulated particles of the liquid molten slag, and provide references for industrial application of the dry-type centrifugal granulation technology.
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