Method for recovering rare earth and gallium from TGG crystal waste

The invention relates to a method for recovering rare earth and gallium from TGG crystal waste, which comprises the following steps: S1, roasting: crushing TGG crystal waste, uniformly mixing waste fine powder with alkali liquor according to a reaction molar ratio in terms of gallium oxide, soaking and roasting to obtain a roasted product; s2, leaching: adding water into the roasted product in the step S1, stirring and leaching, then carrying out solid-liquid separation to obtain a solid phase B, washing the solid phase B until washing water is neutral, and combining filtrate and washing liquid to obtain a liquid phase A; s3, rare earth recovery: adding hydrochloric acid into the solid phase B for dissolving, filtering to obtain terbium rare earth feed liquid, and returning insoluble substances to the step S1 for treatment; and S4, recycling gallium: introducing CO2 into the liquid phase A for the first time until the pH value is 10.0-10.2, filtering out precipitates, adding oxalic acid solids of which the vo