Method for detecting volume expansion rate of blocky iron ore in high-temperature state

The invention discloses a method for detecting the volume expansion rate of blocky iron ore in a high-temperature state, and relates to the technical field of ferrous metallurgy, the upper temperature limit is controlled to be 1550 DEG C, and the temperature rising speed is larger than or equal to 9 DEG C/min; a temperature sensor is arranged in the furnace chamber, and the heating furnace is heated according to a preset plan according to temperature feedback of the sensor and a preset temperature control curve; the one-way variable-brightness light source faces a sample in the furnace chamber, and light rays can illuminate the furnace chamber; cameras and light sources are symmetrically distributed on the two sides of the heating furnace, and front images of the sample are photographed and reserved at 30 seconds intervals; and analyzing the front image of the sample to obtain a high-temperature volume free expansion rate detection result of the sample. The method for detecting the volume expansion rate of th