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Abstract

A method for manufacturing pure salt is provided. The pure salt manufacturing method includes the steps of heating solar salt at 200.degree. C. to dry moisture contained therein, placing the dried salt in a heating kiln and heating the same at 1300.degree. C. to be liquefied for primary melting, diluting the molten salt with clean water to sediment heavy metals or impurities contained therein, separating only brine from the resulting material and heating the same to evaporate moisture contained therein, heating moisture-evaporated salt to produce crystallized salt, placing the crystallized salt in the heating kiln and heating the same at 1500.degree. C. for secondary melting, diluting the secondarily molten salt with clean water to secondarily sediment heavy metals or impurities contained therein, separating unsedimented brine and heating the same to produce crystallized salt, placing the crystallized salt in the heating kiln and heating the same at 1800.degree. C. for third melting, diluting the thirdly molten salt with clean water to sediment impurities contained therein, separating unsedimented brine and heating the same to produce crystallized salt, placing the crystallized salt in the heating kiln and heating the same at 2000.degree. C. for fourth melting, separating an upper layered portion of the molten salt from a lower layered portion, coagulating the separated molten salt and pulverizing the coagulated salt to produce powdered salt. Thus, various heavy metals contained in solar salt are effectively removed, thereby obtaining harmless salt.

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First Claim