How can the impurity in common salt be removed
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Among various methods to increase the purity of common salt, the washing method is simple and was considered suitable to the factories in Japan, then we studied the effects of the washing method using saturated salt solution or brine, to increase the purity by the removal of impurities such as calcium or magnesium in the salt.
The following results were obtained.
(1) The magnesium is removed almost perfectly from the salt by the washing, but the calcium is removed 50-70% of total calcium.
(2) There are a proportinal relation between the magnesium contents of the washing liquid and the washed salt.
(3) The effect of the times of washing or the quantity of washing liquid is not great.
(4) The purity of the washing salt is increased on drying as comparable to the quality of “Refined Salt
The following results were obtained.
(1) The magnesium is removed almost perfectly from the salt by the washing, but the calcium is removed 50-70% of total calcium.
(2) There are a proportinal relation between the magnesium contents of the washing liquid and the washed salt.
(3) The effect of the times of washing or the quantity of washing liquid is not great.
(4) The purity of the washing salt is increased on drying as comparable to the quality of “Refined Salt
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