The invention relates to the technical field of edible salt extraction, in particular to nutritional type green edible salt extracted from
salt lake mining areas and an extraction method thereof. The method specifically comprises the steps of
salt pan production, a test for removing trace
heavy metals in a
solid sample, a test for improving the
dissolution rate of the
solid sample and a test for changing components of the edible salt
solid sample. According to the method, in the
salt pan sampling and washing work, used equipment is light and handy, and the operation is relatively simple; physical washing is adopted and does not pollute brine in the
salt pan, and washing
tail liquid is discharged into the salt pan and does not affect
carnallite production in the salt pan; the whiteness,
granularity,
sodium chloride, water-insoluble substances, lead,
arsenic,
fluorine,
barium and other related hygienic and chemical indexes after washing completely meet the national edible salt standard; trace
heavy metals in the solid sample are further reduced by an alkali washing method; the solid sample can be dissolved within about 6 seconds at the fastest rate; and in addition, operations such as
road construction, drilling, groove exploration, pit exploration, well exploration and the like which damage the
soil surface do not exist in the test process.