FIELD: chemical industry, particularly, purification of sodium chloride solution from calcium and magnesium ions. SUBSTANCE: method comprises using as flocculant, product of reaction of polyacrylamide, alkali and flotation agent consisting of mixture of ethylenepropylene glycols of general structural formula: 
and ethyl ethers of ethyl- propylene glycols of general structural formula: 
wherein n is 2-3 and m is 2-5. EFFECT: higher degree of purification and lower consumption of flocculant. 1 tbl
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