A process for producing a gallium nitride crystal which includes a growth step in which nitrogen is dissolved in a mixed melt comprising gallium and sodium to grow a gallium nitride crystal (5) and a recovery step in which an alloy (51) comprising gallium and sodium is reacted with a liquid (52) that ionizes the sodium, thereby separating sodium ions and gallium (55) from the alloy (51), and the separated gallium (55) is recovered.
