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The behavior of ferrous sulfate hydrates dissolving process, and its effect on iron removal efficiency during hydrotherrnal iron precipitation were investigated.Different parameters affection the dissolution rate of ferrous sulfate hydrate such as pre-crystallization, pre-oxidation of ferrous sulfate and temperature were separately studied.The results show that more than 60％ and 80％ sulfate of zinc and ferrous ion, respectively, were readily crystallized when the temperature is higher than 180℃.