As a prince, he lives in Kaifeng City and is very rich. Zhu Zilong naturally will not be reluctant to seek the near and far, and let people go outside to buy more salt at the moment!

The blast furnace has not yet come out, and of course he is not going to experiment with making glass. Instead, I hope to be able to purify the fine salt first!

In the past few months, refined salt has naturally been indispensable in his food. But this refined salt is not the other refined salt, if it is just cooking, Zhu Zilong can still accept it, but if it is to be used to make glass, it is estimated that it will have to be purified again.

It is only necessary to achieve a purity similar to that of modern refined salt, and the success rate may be higher.

"Lord Wang, the salt has been bought. Here's the bill, as you ordered, to come, and a few other things, which have been put in the warehouse! ”

"Oh, put it down, let's go out first, I'll call you when there's something!" Zhu Zilong replied lightly.

"Yes!"

picked up the bill, but Zhu Zilong's eyes flashed and flashed.

"The price of salt, gone up again? And it's still up so much? Sell for three-thirds of silver per pound of salt? Last month, I remembered, I still sold for one and a half cents of silver per pound of salt. On the other side of the canal, it only sells about a penny or two of silver! ”

Zhu Zilong can't be surprised, because according to this price, it is about the same as the feeling that the 21st century will price you for a pack of salt for about 100 yuan. I can't afford to change anyone!

Think about the modern 21st century, the average price of two or three yuan a pack of salt in the supermarket is still fine salt. The ex-factory price is cheaper, and Zhu Zilong is extremely speechless.

"The court of each dynasty stipulates that salt and iron tea must be sold officially, and everything that is sold privately is a felony, and the degree of this felony is basically the same as beheading, and it is no wonder that the profits in this competition are so heavy. If I had changed, it would have been the same! ”

A piece of salt and a piece of rice are all necessities of life.

Rice farming is the main industry of the people of the Song Dynasty, almost 90% of the people are planting, as long as it is not a natural disaster continuously, but the price increase is also limited. But this salt?

The sodium ions in table salt are essential for the transmission of information in the nervous system, and are related to muscle contraction and heart beating. Therefore, if the human body lacks salt, the nervous system will be very weak, and people will appear weak. It's also very susceptible to getting sick!

Salt is not only an important condiment, but also an indispensable substance for maintaining the normal development of the human body. It regulates the balanced distribution of water in the human body, maintains osmotic pressure inside and outside cells, participates in the formation of gastric acid, promotes the secretion of digestive juices, and can increase appetite.

At the same time, it also ensures the pH necessary for pepsin, maintains the balance of pH in the body, and the normal circulation of body fluids.

So in some ways, salt is even more important than rice.

In ancient times, salt production was limited, so the price was high and the profits were amazing. Even modern salt is so cheap that it is smuggled by someone. Not to mention antiquity? At this time, if it weren't for the fact that Zhu Zilong already had a lot of money, he would have wanted to smuggle and sell salt.

"The nearest salt field here in Kaifeng should be over there in the Yellow Sea, right? That's sea salt! There are canals to communicate, although the distance is hundreds of thousands of miles, it is also possible to come and go in more than ten days. Sea salt, no wonder! Zhu Zilong sighed.

Smuggling salt for such a high profit is a capital offense, and someone will do it. It is like sea salt, and the sea water is not expensive, and the main cost is labor and time. Almost ignoring the cost, the profit is high enough for people to smuggle and fight against the government!

To tell the truth, there are people in the Cao family who are smuggling salt, and you have to say that there is no one in the other family, and you don't believe it if you kill Zhu Zilong. It's just that the concealment is better, plus someone opens one eye and closes one eye, which is beneficial for everyone to take together. And the emperor doesn't take care of things very much, hehe, of course, this has something to do with the fact that sea salt is not mainstream salt after all!

Thinking of this, Zhu Zilong sighed heavily.

Don't look at the Great Song Dynasty There were a lot of taxes, but one thing is for sure. If we can deal a heavy blow to the smuggling of salt, not to mention doubling the tax revenue, it will definitely be no problem to increase it by about three or four percent.

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However, thinking about it, Zhu Zilong, who has solidified this interest, can't move it for the time being, and whoever moves will die.

After sighing, Zhu Zilong began to experiment when he was young. The manufacture of sea salt before and in the Song Dynasty was all made from frying. Sea salt is to scrape the soil and pour brine, and take the brine to burn the salt.

The method and utensils of sea salt pan frying have gone through the Yuan, Ming and Qing dynasties, and there is no obvious difference. Laoshan Qingyan arrived late in the 27th year of Guangxu of the Qing Dynasty (1901), and the salt people used the method of ditch beach to change frying to drying, thus ending the history of frying salt.

Frying salt consumes a lot of firewood and grass, which is labor-intensive and labor-intensive. Zhu Zilong took a small amount of sea salt from each part to imitate the salt drying method and did many things.

On the other side, Zhu Zilong soon found out. The so-called ready-made fine salt is actually not of high purity, and when it crystallizes out of seawater, it will inevitably carry some sediment and impurities. In addition to sodium chloride, there are magnesium chloride and calcium chloride in seawater, which are also mixed with sodium chloride and crystallized.

However, this is not difficult for Zhu Zilong.

Go back to the original test room, boil another bucket of boiling water (fresh water), boil it, and put a towel on top (for filtration). Then, add the sea salt.

When the water is almost dry, pour it into a bucket and filter it once. Constant boiling is employed. This method is somewhat dangerous and will burn salt if asynchronous attention. The advantage is that it's the fastest way to do it!

Add an appropriate amount of water to the remaining mixture a second time, and the sodium chloride can be dissolved in water, thus obtaining a crude potassium chloride product. Crude potassium chloride is further crystallized and recrystallized to obtain refined potassium chloride.

In this process, in order to do the test, Zhu Zilong borrowed the ability of the system to accelerate the processing.

Without speeding up, the process can be slowed down for many days. The results were gratifying and done!

With perceptual techniques, I detected the impurities, and it was completely OK. Zhu Zilong wiped the beads of sweat from his forehead and smiled with joy.

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However, after laughing for a while, Zhu Zilong's smile stiffened a little when he recalled the price of this salt.

"Even though I can purify sea salt, it's for later use when making glass. It's not cheap. On the other hand, these sea salt farms are all in a monopoly, and if you think about it carefully, the early investment is large, and one of the raw materials is controlled by others, which is really not a good policy! ”

Zhu Zilong walked around the room, in fact, there was another reason.

The main source of salt in China in the past dynasties was well salt, that is, the mining of underground natural salt layers, including solid rock salt and liquid brine, which can be used after crystallization and purification.

Sea salt is just a supplement, because in addition to sodium chloride, sea salt also has a large number of other salts, such as sulfide salt, potassium salt, etc., which are toxic and harmful to the human body.

Although Zhu Zilong can be purified successfully now, if he wants to purify on a large scale, with the monopoly status of Kaifeng and Huangzhuang, I am afraid that others will not let go.

If you are a second-class dealer, the cost will be high, and there is the possibility of helping people make wedding dresses.

"Perhaps, I can come up with a dozen ideas for so-called poisonous river salt and mineral salt near the Yellow River. That's right, that's what, before the crossing, I read the "Tang Brick" of the historical god when the unowned river salt method! Suddenly, Zhu Zilong had an idea and thought of something.

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