Brown corundum soot is a common secondary resource. Its main components are Si, Al, K, and secondary components include Ga, Fe, Mn, Ca, Mg, etc., which have a high recycling value. The demand for gallium metal has been increasing year by year, and the market price has shown substantial growth recently. Hence, research on the recovery of gallium from brown corundum soot is of great significance. In this work, an optimum process of sodium salt roasting followed by acid leaching was determined to extract gallium from the brown corundum soot by comparing the conventional acid leaching, conventional alkali leaching, and sodium salt roasting-leaching experiments. Effects of additive types, roasting temperature, and adding amounts of additives on the recovery of gallium were studied, and at the same time, the leaching behaviors of the three main impurity elements of Si, Al, and K in the process of gallium extraction were explored. The results showed that the recovery of gallium was only about 10% when using the conventional acid leaching to treat the brown corundum soot, while the recovery could reach 71.24% when using direct alkaline leaching at 90℃ for 3 h. After roasting, the leaching percentage of gallium was much higher than that of direct acid leaching and direct alkaline leaching. The gallium recovery of sodium carbonate roasting was higher than that of sodium chloride roasting. The leaching method of the roasted sample had a significant effect on the leaching efficiency of gallium. The order from high to low was acid leaching>alkaline leaching>>water leaching. The best gallium extraction route was found to be sodium carbonate roasting-acid leaching. The roasting temperature and the added amount of sodium carbonate remarkably affected the recovery of gallium and the recovery could go as high as 98.38% when the operational parameters were kept at a roasting temperature of 850℃, the mass ratio of sodium carbonate to soot being 1.0, roasting time of 2 h, leaching with concentration 25vol% sulfuric acid at 80℃ for 3 h, Meanwhile, the leaching rate of impurity Si was 0.31%, but as for Al and K they were both high, which brings difficulties to the subsequent purification of gallium solution and the separation of gallium.