1, the manufacture of sea salt before the Song Dynasty was all out of speculation.
Sea salt is scraping the soil, drenching the brine, and burning the brine to cook the salt.
There is no obvious difference in sea salt frying methods and utensils after the replacement of Yuan, Ming and Qing Dynasties.
Laoshan green salt was later than 190 1 year after the twenty-seventh year of Guangxu in Qing Dynasty. Salt people fried it in the sun by the method of ditch and beach, thus ending the history of salt frying.
Sea salt has been exposed to the sun since the Northern Song Dynasty.
However, due to technical reasons, the effect is not very good, so fried salt is still more than dried salt.
3. By the end of Qing Dynasty, most sea salt producing areas were changed to sun drying, and the technology was gradually improved.
Those woks and salt frying equipment set up along the coastline for thousands of years have naturally become a thing of the past.
4. The south, such as Hainan Island, has abundant sunshine and is an ideal place for drying salt.
The simplest method is to use the beach sediments dried by the sun, pour in seawater, filter to make high-salinity brine, and then store the brine in a pool and evaporate in the sun to form salt.
5. The production of well salt is divided into two steps: extracting brine and making salt. In ancient times, the methods of extracting natural brine were mostly salvage, but in modern times, there are gas lift, brine extraction and self-spraying brine.
In rock salt-type mining areas, most of them adopt drilling solution mining method, some adopt single-well convection method, and some adopt double-well hydraulic fracturing method.
In ancient times, well salt was fried, similar to sea salt frying.
6. Lake salt is primary salt and regenerated salt, which is mainly produced by mining method or beach drying method.
Some salt lakes have been evaporated for a long time, and sodium chloride is deposited at the bottom of the lake, such as the salt lake in Qaidam Basin. After tens of millions of years of changes, dried lakes have been formed, and salt crystals are exposed on the surface, which can be directly excavated without processing.
The beach drying method has a long history in lake salt production, which is different from the early sea salt production process.