Slow-soluble salt and preparation method

Slow-soluble salt and a preparation method are characterized in that the soluble salt comprises sodium chloride powder salt and calcium oxide. The calcium oxide occupies 0.1% to 5% of sodium chloride by weight. The preparation method includes first evenly mixing the powder salt and the calcium oxide, conducting compression molding on the mixed materials and finally naturally placing the molded body for one week to obtain an end product. The slow-soluble salt and the product have the advantages of 1 being capable of achieving slow solubility, enabling solution speed of salt in water to be greatly reduced and being capable of completely controlling solution speed of the salt in water according to different prescriptions; 2 being capable of utilizing salt powder dust for production to achieve waste utilization, save resources and purify environment; 3 being suitable for requirements of other industries except for meeting requirements for industrial production, for example, adding various nutrition constituents t