The Prodigal Son of Zhenguan

If it is modern industry, then you only need to add excess barium chloride, sodium hydroxide, and calcium carbonate in the last step, remove the corresponding silver sulfate, magnesium ions, and calcium ions, turn them into precipitation, and then add another step of filtering, and finally evaporate and crystallize again.

But in the Tang Dynasty, this is difficult to achieve.

Therefore, Li Fu intends to settle for the second best and only need to remove the calcium and magnesium ions.

Potassium chloride is salty like sodium chloride and can be eaten as table salt. Its toxicity is not great, which is equivalent to sodium chloride. However, table salt containing potassium has a certain hygroscopicity and is easy to clump after being stored for a long time.

But even so, it is much better than the bitter "poison salt".

As for how to remove calcium and magnesium ions, there is a good raw material, that is, the wood ash from cooking.

Add wood ash to the salt solution and boil it, and finally let it stand, filter out the insoluble matter, among which there are calcium carbonate and magnesium hydroxide.

Finally, boil the salt, so that the "poison salt" becomes refined salt.

After a whole day of tossing and turning in the workshop, a large pot of salt water was prepared. When the salt was boiled for the last time, it was already dark outside.

Li Fu didn't mind and waited in the workshop. He had lunch in the canteen of the egg-changing workshop next door.

He took out the method and tried it at home. It was fine. However, today was the first time to process "poisonous salt" again.

It was still different from home. There was an extra process. I didn't know if it would work.

But after watching the salt water filtered out for the last time, and the impurities were left in the filter container, Li Fu felt relieved.

It wasn't until dinner time that the final result came out.

White refined salt had settled in the pot. The worker took out the refined salt, put it on a plate, and brought it to Li Fu to see.

Li Fu dipped a little with his hand and tasted it in his mouth.

There was no problem at all. It was refined salt.

It worked!

Li Fu smiled.

"Okay! Reward all those who worked in the workshop today!" Li Fu waved his hand and rewarded the craftsmen.

"Thank you, Your Highness!"

When the craftsmen in the workshop heard this, they were excited and excited.

What could be more exciting than getting a reward?

It's worth working here for a day.

This thing is done, and when Li Shimin and others come, it's nothing more than doing it again.

Moreover, the room for boiling salt in the workshop can be connected to the room for fermenting soy sauce. In this way, when the fire is burned here, the heat will be transmitted to the other side through the ground dragon, and soy sauce can be made in winter.

Lao Zhao came to pick up Li Fu, bringing several guards from his family and holding lanterns. It was too late, and he was worried.

Li Fu came to the workshop with only Wu Liangye.

He didn't expect to spend so much time in the workshop.

The next morning, Li Fu went to the workshop again.

The salt issue is settled, so we need to research soy sauce.

On the third day after returning to the manor, Lao Zhou had prepared everything. The pig farmers in the manor carefully selected three big fat pigs and slaughtered them according to Li Fu's instructions.

Half a pound of meat is only the size of a fist, but there are so many people in the manor, so it is already very good to be able to share it. Many families only see meat a few times a year.

The people are still poor now.

This is the case in Li Fu's manor, not to mention other manors.

The villagers tied up the fat pigs and prepared everything.

The wooden rack for disembowelment, the table for slaughtering, and the stove for depilation.

Because Li Fu, the master of the family, eats pork, there are pig farmers, pig butchers, and pig butchers in the manor. After slaughtering and processing, they will be sent to the house.

On weekdays, the expenses of raising pigs were all in the charge of Li Fu, and the farmers were only responsible for cutting grass to feed the pigs.

The tools for slaughtering pigs were gradually completed.

The scene of slaughtering pigs was very lively, especially when three pigs were slaughtered at once.

The farmers guessed that the host family was preparing for the New Year. With so many people in the family, they would definitely be able to finish three pigs.

The banquets of the nobles were different from the dinners of the farmers.

The pigs were grass bags, the sheep were brave, and the cows were crying.

When slaughtering pigs, the pigs' howling was so earth-shaking. Before the knife was used, it was already a struggle just to catch the pigs.

"Alas, don't waste this pig's blood. My husband specifically told me that everything must be kept. Take a basin and catch it all." Shitou said on the side.

He came to get some pork and offal on the orders of Li Fu.

Pig's blood was also among them.

Li Fu thought, in the futureLi Shimin will come here in two days. He will provide lunch for us, right?

There are also small tenderloins to take back. My husband wants to eat some. In addition, I will take some pork belly back.

It is cold now. If we take the things back and put them in the tank outside, they can be stored for a long time.

Although Shitou did not know why his husband would not want the good meat, but insisted on the pig heart, liver, lung, intestines, blood and so on...

Can you eat those things?

A smell.

The offal of the three pigs was not wasted at all. Shitou collected them all and put them on the cart. They were stinking all the way.

After returning to the house, the whole kitchen yard was filled with this smell.

The cook was dumbfounded. What should he do?

However, the cook and Shitou moved the pots of pig offal to the yard.

"Did my husband really want these things?" The cook began to doubt his life.

"My dear, I told you to do it yourself." Shitou said, "Well, wait here for a while. I'll go talk to you and ask you how to deal with these things."

"Okay." The cook nodded.

There must be a way. After tonight, these "shit"-like things will freeze.

This thing smells so bad, will you eat it?

What do you think, dear?

In the study, Lao Zhou was talking to Li Fu about distributing New Year's goods.

Shitou knocked on the door.

"Come in."

"My dear, the pig offal you asked for has been brought back and is now placed in the kitchen yard. Uncle He doesn't know how to deal with it. That thing really smells bad."

It stinks.

"Okay, I know, I'll go over there in a while." Li Fu said.

The people in the kitchen don't know how to clean it up. This is the first time he has thought of getting pig offal. He will go over there in a while and tell the cook how to deal with it.

"Lao Zhou, in a moment, you and Shitou will go to the pig slaughtering area, take the list of our farmers, and let them take the pork back first according to the list." Li Fu said.

"Yes." Lao Zhou responded.