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In order to explore the isothermal growth crystallization mechanism of vanadium‐chromium slag, the growth behavior of spinel crystals in vanadium‐chromium slag is investigated in this paper by using SEM/EDS and crystal size distribution (CSD) theory. It is found that with the prolongation of holding time at 1523 K, the mean diameter of spinel crystals decrease in the initial 30 min and then increased to 60.34 µm. The area fraction of spinel crystals increases from 35.56 to 54.28%. While at 1623 K, expect for the transient decrease at 30 min, the mean diameter of spinel crystals also increases obviously with the prolongation of time. The area fraction of spinel crystals increase from 31.28 to 50%. The results reveal that low temperature befits the growth of spinel crystals. All CSD shapes of vanadium‐chromium slag are lognormal distribution, which implies that the growth of the spinel crystals is controlled by surface and supply, and more inclined to supply control.

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