Lianjiang County, Honglou, Jiang Min looked at these rich gentlemen, "I have a few deals, I don't know if you are ready?" ”

The rich gentlemen, the excitement in their hearts, thought that since this papermaking technique, they have made thinner and whiter paper, not to mention the sale of the whole Zhou country, it is the nearby county capital, it is a tight robbery, even those Dashi clans have begun to use the right, coercion and lure them, they just don't hand over the drawings, as long as this Jiang Min does not fall, they are safe in Lianjiang County, and the scholars of other counties are helpless, "General, what kind of business!" ”

"Process and Production of Refined Salt"

"What? Salt and craftsmanship? ”

Jiang Min looked at their stunned appearance and directly threw them a packet of white and fine refined salt.

The rich gentlemen were excited, this kind of good salt would definitely be able to be bought and sold, and they all picked up a drawing and looked at it.

{Salt production process}

(1) Production of sea salt

Sea salt production, generally using the sun drying method, also known as the "beach drying method", is the use of coastal mudflats, dam to open up salt pans, through the tide to raise water, attract seawater irrigation ponds, after sunshine evaporation into brine, when the brine concentration evaporation reaches 25 degrees of Baumé, the precipitation of sodium chloride, that is, the raw salt. The production of raw salt by the sun drying method has the advantages of saving energy and low cost, but due to the influence of geography and climate, it is not possible to build salt pans in all coastal tidal flats, and salt can be dried in all seasons. The air is dry, the sunshine is long, the evaporation is large, the yield of salt is high, and vice versa, the yield is low. In the northern salt works, only March to November is the salt season.

The process of producing raw salt by sun-drying method is generally divided into four major processes: moisture absorption, brine making, crystallization, and salt collection.

1. Na tide

The raw material extraction process for the production of raw salt. Seawater is the raw material for the production of salt, and in order to ensure the normal operation of production, it is necessary to ensure the supply of raw materials in every possible way. At present, there are two kinds of tide acceptance methods, one is natural tide acceptance, and the other is power absorption. Natural tidal acceptance is to let the sea water flow naturally along the tidal diversion channel at high tide; Axial flow pumps are generally used to bring in seawater, which is characterized by not being limited by natural conditions.

2. Halogen

Brine production is carried out in a vast evaporation pond, and the water depth of the evaporation pond is properly grasped according to the daily evaporation amount, so that the brine concentration is gradually increased, and finally concentrated into saturated brine.

3. Crystallization

In the process of continuous evaporation and concentration of seawater, the concentration of various salts continues to increase, and when the salt concentration reaches saturation, it will be precipitated in the form of crystals, and in the supersaturated solution, the supersaturation of the solution is continuously maintained, and the crystals can continue to grow.

4. Collect salt

It is to put away the grown salt by hand.

(2) Production of mine salt

The production of mine salt is mainly divided into two links: brine mining and salt production. Different ore types use different brine mining methods. The methods of extracting natural brine include extraction method, gas lift method, oil pumping brine recovery, deep well submersible brine pump, self-spraying brine recovery and other methods. In the rock salt mining area, most of the well-digging water-soluble mining methods are used, some use the single-well convection method, and some use the double-well hydraulic fracturing method.

1. Convection method

This method is one of the more commonly used methods for mining rock salt mines, with a higher degree and lower cost. It uses the characteristics of rock salt mine to be dissolved in water for mining, the specific method is: drill a well to the salt layer, the next two layers of bamboo pipes, the outer layer of bamboo pipes with oil to lift the soil to fix the well, from one of the pipes to inject water, dissolve the salt layer, by another pipe to pump the brine up.

2. Fracturing

This method is to drill two wells on the ground, lower the casing, seal the well pipe and the well wall, press high-pressure water from one well, form a channel in the salt layer, dissolve the salt layer, form saturated brine, and press out the ground from another well for production. Salt production is carried out in the factory area, and the brine purified from the brine storage tank is fed into the tank, and the water is continuously evaporated by heating steam. After evaporation, the brine becomes a half-salt and half-water salt slurry, and then dehydrated to become the finished salt

(3) Production of lake salt

Lake salt is divided into primary salt and regenerated salt, which is mainly used by mining method or beach drying method. In terms of mining, some lakes have been evaporated for a long time, and sodium chloride settles on the bottom of the lake, which can be fished directly without processing. For example, the salt lakes in the north have undergone tens of millions of years of changes; A dry lake is formed, the salt of which is exposed to the surface. It can be produced by a salt mining ship, and its process flow is roughly as follows: stripping the mulch - salt mining - pipeline transportation - washing and dehydration A belt ship transports a finished salt mound. As for the beach drying method, it is similar to the sea salt production process.

"General, this mineral salt is okay, but this sea salt is weak, there are too few salt mines in my Zhou Kingdom, and they are still controlled by the imperial court, and we don't have the right to salt," Lin Zhengtian looked at the heart but powerless

Jiang Min knew their thoughts, "I'm just giving you a drawing to buy, there will be a salt mine in the future, as for this salt right, as long as it is my chassis in the future, you can make salt and buy salt, but you must hold an official business license, and you are not allowed to sell it to the people at a high price, I can give you the right to salt, and you can also take it back." ”

The rich gentry of the Shi clan are not stupid, listening to Jiang Min's tone, there is no doubt about rebellion, thinking that since the Dashi clan forced them to hand over the paper drawings, they have been tied to Jiang Min's chariot, and they have no good fruit to eat if Jiang Min pours it, "What about your second deal, general?"