When purifying coarse salt, I forgot whether it was the experimental project that the teacher had done in elementary school or junior high school, and I still knew the steps. He still vaguely remembered that the original one was not just purifying salt, but made it with a piece of salt-alkali soil. First, crush the soil and mix it with water, and then settle it, which was much dirtyer than the sea salt.

There is obviously no distilled water used for purification. It is very troublesome to make it in this era and it is too luxurious. However, there are spring water, and there are generally not many impurities in spring water, which can completely replace distilled water.

The basic operation of purifying coarse salt is to first filtration, with the focus on removing impurities in coarse salt, that is, sediment and other insoluble matters.

The filter paper required for filtration can be replaced by cotton cloth, and there are a lot of them in Kongfu. He directly took a batch of new cotton cloth and then folded it in half three times, almost enough thickness.

Filtration needs to be repeated to remove all impurities as much as possible.

Of course, Kong Youde's identity does not need to be handled by himself. He only needs to be responsible for commanding. The specific operations are all from the servants. The housekeeper Zhang Dafu and Zhang Hua both stood aside to see if the coarse salt can turn into fine salt, or how it turns into fine salt.

Because it was the first test, we had to see the effect as soon as possible. Therefore, Kong Youde asked someone to put about twenty kilograms of spring water into the bucket, and then poured the coarse salt in continuously, and stirred it with a wooden stick. After it was completely dissolved, he continued to add coarse salt and repeated the work until the salt could no longer melt.

Kong Youde vaguely remembered that the saturation concentration of salt water was about one-third, which means that almost six and a half kilograms of salt were dissolved in this bucket.

After the coarse salt is completely dissolved, seal the mouth of the bucket with three folded cotton cloth, then turn it over and let the salt water drop naturally until all the salt water is dripping.

After the salt water drips, a lot of impurities remained on the cotton cloth, some yellow and some black, and then the people were asked to clean the dirty things.

However, filtration is not enough at once, and you have to filter it repeatedly until there are no more impurities on the clean cotton cloth.

After almost five such filtrations, the brine was basically extremely clear, and there were no impurities visible to the naked eye on the cotton cloth. It can be said that the first step has been completed.

Then there is the second process, filtering the brine from the charcoal. The charcoal has a strong filtration effect and can remove most impurities invisible to the naked eye in the water. After several filtrations by Fanfu, this bucket of brine has basically been completely processed.

Then, the filtered brine was poured into a large pot, covered with cotton cloth, and boiled on the heat below to steam the water completely.

During this process, you need to constantly stir with a clean stick until the water is completely evaporated. Continue to stir to prevent the salt from condensing. After the water is completely evaporated, the white fine salt will basically come out.

"alright!"

Kong Youde said happily.

The housekeeper who looked next to him was also happy, because he knew that this was not ordinary coarse salt based on his color and condition.

If you look closely at the purified sea salt, it is no longer granular, no longer yellow, but white powder.

Slide gently with your hands and you can feel a very thin and refreshing feeling. Even if you don’t touch it with your hands and just look at it with your eyes, you can feel that it is much better than the original coarse salt.

As the butler, Zhang Dafu naturally knew these different types of salts, such as coarse salt, fine salt, green salt, etc., and they were clearly divided.

He picked up a small pinch of salt and let it in his mouth and tasted it carefully. He couldn't help but exclaim, "Sir, it's really fine salt. This salt no longer has the astringent and slightly bitter taste of coarse salt.

With this experience, the salt industry, the salary required for training will have a source. The major events that the general wants are just around the corner!"

Kong You was also very satisfied, but he didn't expect it to be successful in one go. As long as you wait a few days, the salt field expansion will be completed and the output of coarse salt will be increased. There is no need to worry about the raw materials for making refined salt.

However, he still said, "There is very little salt on the market now, but this method is so simple. Once it spreads, we will not make much money. We must be strictly supervised. The people who produce salt must be loyal and reliable people!"

The butler Zhang Dafu thought this was very reasonable, so he thought, "Sir, I think there is a suitable candidate. Shen Mo, the head of the mansion, can do this job well. He is clever and loyal, and will definitely not leak information. He can do this well!"

"Let's do this, Shen Mo will just manage the production with experience. I will give him two hundred soldiers to be responsible for defending the production site. However, this is still a matter of takeaway, Uncle Fu, you still need to be responsible for it!

Let's do this, maybe we need to do other businesses in the future. We can set up a business name. I have already thought of the name, and it is called the "Liaoning" business name. Uncle Fu, please select some loyal, reliable and capable people, put up the platform, and openly draw a line with our General Mansion, so that it is easier to do things!"

Zhang Dafu thought about this idea carefully and it made sense now. After all, the head of the family is still in opposition to the court, and this salt business cannot be carried out only in Dengzhou. After establishing a business to clearly define the boundaries, it is convenient to sell it to other places.

However, the name of this business name is a bit interesting. Isn’t Liaoning the meaning of the peaceful place in Liao? It seems that the head of the family still misses Liaodong, the place where he grew up, but unfortunately he is now occupied by Jiannu!

"Sir, you can rest assured that you have to leave these things to me, but what kind of charter this business is? You still need to take care of it. We can also act according to this charter!"

Kong Youde thought it made sense. The 'Liaoning' business he was planning to establish was actually a company similar to a later generation. It would be impossible to have no rules and regulations. "So, Uncle Fu, I will formulate this charter later. You can select personnel first. Come here early the morning after tomorrow. I will announce the rules together!

Also, we will call all the big salt merchants in Dengzhou City over and ask them to come to the General's Mansion the day after tomorrow. We cannot sell this salt to each household by ourselves. We still have to go through the salt merchants. However, the owner of Dengzhou has changed. Can the salt merchants continue to sell salt? That's all we have to say!"

"Okay, I'll do these tomorrow, but what if those salt merchants don't come?"

Kong Youde was not worried about this, "Uncle Fu, you don't have to worry about these things. We have knives in our hands. If they don't come after the invitation, then hand them the knife!"
Chapter completed!