How is the well salt in Zigong formed?

Well mineral salt is deposited in inland waters and basically does not coexist with other minerals. That is to say, this place used to be a sea, but later the sea water was buried by the earth's crust, leaving salt after the water evaporated. Therefore, large-scale salt mines are generally hundreds of meters thick salt beds, in which there are no mineral impurities.

Well salt is mined with water. Generally speaking, it is to put two pipes into the salt layer, one is clear water and the other is saturated brine (don't forget that salt is soluble in water), and then evaporate these saturated brine to get salt.

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The difference between well salt and sea salt:

Sea salt is a kind of salt made by drying in seawater. In addition to sodium chloride, the processed sea salt may also contain other trace elements such as copper, iron, magnesium and calcium. Sea salt from different places contains different trace elements, which will produce different colors, such as tan, taupe, reddish, dark white and so on.

Well salt is made by extracting natural brine from the surface or underground by sinking method. In addition to sodium chloride, the processed well salt may also contain other trace elements such as magnesium and calcium, and its color is generally white.

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