Method for manufacturing pure salt

Abstract

A method for manufacturing pure salt is provided. The pure salt manufacturing method includes the steps of heating solar salt at 200° C. to dry moisture contained therein, placing the dried salt in a heating kiln and heating the same at 1300° 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° 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° 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° 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.

What is claimed is:  
     
         1 . A method for manufacturing pure salt, including the steps of: 
 placing solar salt in a heating kiln and heating the same at 200° C. to dry moisture contained in the solar salt;    placing the dried salt in the heating kiln and heating the same at 1300 20  C. to be liquefied for primary melting;    diluting the molten salt with clean water to sediment heavy metals or impurities contained in the salt;    separating only brine from the resulting material and heating the same to evaporate moisture contained in the brine;    heating moisture-evaporated salt to produce crystallized salt;    placing the crystallized salt in the heating kiln and heating the same at 1500° 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° 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° 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.    
     
     
         2 . A method for manufacturing pure salt, including the steps of: 
 placing solar salt in a heating kiln, heating the same at 1200° C. to be melted and then sterilizing the molten salt;    heating the molten salt at 1500° C. to burn impurities floating in the upper layered portion of the molten solution to be removed;    separating only one third the remaining molten salt and repeating the above procedure several times to extract pure salt; and    coagulating the extracted salt and then pulverizing to produce powdered salt.