《Table 1.Leaching experimental parameters and values》

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《Leaching kinetics of celestite in nitric acid solutions》

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The leaching experiments were performed using a500-m L three-necked glass reactor flask fitted with a mechanical stirrer（Heidolph RZR 2020 and IKA RW 20）and immersed in a temperature-controlled water bath（Memmert）heated to the required temperature；the reaction conditions were kept constant under 100 kPa.A condenser was used to prevent solution loss by evaporation during the leaching experiment.A 100-mL nitric acid solution of predetermined concentration was added to the three-necked glass reactor，and the temperature of the solution in the glass reactor was measured with a portable digital thermometer.When the target temperature was reached，the celestite，which had been weighed on an analytical balance（Sartorius AX 224）with a sensitivity of 0.1 mg，was introduced into the reactor with a predetermined stirring speed.At the completion of the period of action，the pregnant solution was filtered using a funnel with a filter paper blue band；the experimental temperature was maintained.The nitric acid and water used in the experiments were of analytical purity.The chosen parameters for this study are given in Table 1；the experimental apparatus is shown in Fig.1.