Method for reducing energy cost by using heat pump in making zincate salt

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PURPOSE : A method for producing re-crystallized salts is provided to reduce markedly an energy cost required for producing re-crystallized salts by heating a salt solution in advance using a heat pump. CONSTITUTION : A method for producing re-crystallized salts using a heat pump includes the steps of : charging salts and water into a tank(1) to obtain a salt solution; supplying heat generated from the heat pump(3) to the tank to heat the salt solution to predetermined temperature; sending the heated salt solution to a heating tank(2); and heating the salt solution to 100 °C or higher, and then cooling the salt solution to obtain the re-crystallized salts. © KIPO 2008