The invention discloses a preparation process of low-iron 4N
gallium. The preparation process comprises the following steps: step 1, adding a
gallium-containing solution
stock solution to an
electrolytic cell; step 2, electrolyzing the
gallium-containing solution
stock solution for 5 hours at the
current density of 0.137A / cm<2>, and separating high-
iron metal gallium out of the
electrolytic cell;and taking out the high-
iron metal gallium in the
electrolytic cell, and using the residual solution in the electrolytic
cell as a low-iron gallium preparation solution; step 3, electrolyzing the low-iron gallium preparation solution prepared in the step 2 at the
current density of 0.119A / cm<2>, controlling the
electrolysis time of the low-iron gallium preparation solution within 20 hours, separating out the low-
iron metal gallium from the electrolytic
cell, and taking out the low-iron
metal gallium for later use; and step 4, feeding the low-iron
metal gallium prepared in the step 3 into a
crystallization tank of which the temperature is lower than the
melting point of gallium, and conducting crystallizing to prepare the low-iron
crystal gallium. By means of the preparation process, the content of Fe in the 4N gallium product can be reduced, it is guaranteed that the 4N gallium product can meet the
quality standard for preparing high-purity gallium, and the yield of high-purity galliumis increased.