Then, the appropriate fabric was torn off the long skirts of the two women, and a simple "filter" was made. The coarse salt solution was filtered several times to maximize the removal of the insoluble sediment in it.

Finally, I got a basin of brown coarse salt solution, and with the naked eye alone, no impurities could be seen.

After the three of them rested for a while, the quicklime was burned.

So, under the guidance of Zhu Xiuyuan, the two women took the clay pot, filled it with quicklime, and poured it into an appropriate amount of clear stream water.

The quicklime heats up when it encounters water, and bubblings and bursts of water mist rise... Finally, I get the cream-like white lime milk.

Pour the lime milk into a copper basin, stir and mix with the coarse salt solution, and then set aside for a standstill.

The impurities contained in the crude salt solution are soluble substances represented by "calcium ions", "magnesium ions", "sulfate ions", etc. This is the source of the bitter taste and brown color of coarse salt.

The main component of lime milk is "calcium hydroxide". After mixing with the crude salt solution, stirring and contacting with air, you can obtain "hydroxide ions" and "carbonate ions".

The "calcium ions" in the impurities of crude salt react with "carbonate ions" to form "calcium carbonate" precipitates.

The "magnesium ions" in the crude salt impurities react with the "hydroxide ions" to form the "magnesium hydroxide" precipitate.

The precipitate is insoluble in water and can be filtered out with a simple "filter".

As for the "sulfate ions" in the impurities of crude salt, the "calcium sulfate" produced by the original "calcium ions" in the crude salt solution is a precipitate, but it is slightly soluble in water, so the removal effect is limited.

After a series of chemical reactions, "magnesium ions" can be removed, but "calcium ions" and "sulfate ions" cannot be completely removed.

Fortunately, "calcium sulfate" is slightly soluble in water, and the content of the two ions in the obtained solution is already very dilute.

Just now, the operation was as fierce as a tiger. In fact, it was mainly to remove "magnesium ions", that is, impurities such as "magnesium chloride".

The salt produced by this method has only a little bitter taste. If it is not very particular, it can be ignored.

It can be said that this salt is infinitely close to modern edible salt.

At least, as far as Zhu Xiuyuan knows, although it has some impurities, its color is also snow-white and flawless.

From the outside, it is difficult to distinguish it from modern refined salt!

As for these two impurities, it will be very complicated to completely remove them, and it is impossible to do so under the existing conditions.

For example, "calcium ions" can be completely removed with "sodium bicarbonate", but "sodium bicarbonate" is commonly known as baking soda, where can he get it?

Let’s talk about “sulfate ions”, this is even more complicated. It is “barium chloride”, “sodium carbonate”, and “dilute hydrochloric acid”. It is almost impossible to achieve under the current conditions.

Zhu Xiuyuan can only do this.

This step seems simple, just add lime milk to the coarse salt solution.

But in fact, this is already at the level of the "Republic of China" period. Compared with an era when even the "salt-salt method" did not appear, this technology is simply amazing.

It can be described as "spanning thousands of years"...

The copper basin that was left standing was full of mixed coarse salt and lime milk. It was placed on a stone pier in front of the cave and was placed safely and steadily.

Next to the stone pier, Zhu Xiuyuan, Dong Shuzhen, and Kou Wanwan all surrounded there, staring at the mixture in the copper basin.

Especially the two girls Dong Shuzhen and Kou Wanwan, they did not understand Zhu Xiuyuan's series of "magic operations" and had too many questions in their minds.

But now, they didn't even know how to ask, so they could only open their eyes and stare at the water in the copper basin.

"Husband...husband, what should we do next? Do we have to guard this basin of water?" Dong Shuzhen suddenly asked.

Next to him, Kou Wanwan was also confused and wanted to know what to do next, so she turned her head and looked at Zhu Xiuyuan.

"Not bad!" Zhu Xiuyuan suddenly became serious and very solemn: "Now is the most critical moment. If there is a little difference, everything we did today will be in vain!"

"Ah, so serious!"

Dong Shuzhen's big eyes were frightened and she couldn't help but feel excited and tense her face tightened.

"Don't worry, husband, I'll leave the important task of protecting the copper basin to me!"

Kou Wanwan next to her couldn't help but tense her nerves and stared at the water in the copper basin.

But suddenly, Kou Wanwan heard bursts of laughter, and came from Zhu Xiuyuan. He seemed to be feeling very uncomfortable and was almost distracted.

Kou Wanwan immediately turned her head and looked at it.

Sure enough, Zhu Xiuyuan had already carried his back to his back, facing his back to the two women, and shook his shoulders. Judging from his arms, he seemed to be covering his mouth tightly.

Kou Wanwan was stunned and immediately stunned.

I thought to myself, what is the young master laughing at?

At this time, Dong Shuzhen also noticed Zhu Xiuyuan's abnormality. She looked up at Zhu Xiuyuan's back, then quickly lowered her head and stared at the copper basin.

She never forgot the "heavy task" assigned by her husband, that is, to keep a close eye on the copper basin, and it is best not to blink your eyes.

"Young Master...why are you laughing at?" Kou Wanwan felt something strange and couldn't help but ask.

"No...nothing...hahaha..."

It would be fine if Zhu Xiuyuan didn't speak, but once he spoke, he was deflated and couldn't hold it in. He leaned back and forth, and he bent down with laughter.

"Young Master, this copper basin... we don't have to guard it, right? You... you... teased us!"

Kou Wanwan's eyes suddenly lit up, and she already understood the root cause of Zhu Xiuyuan's laughter.

However, Zhu Xiuyuan just laughed continuously, turned around and stared at the two women, and then started laughing again.

At this time, Dong Shuzhen also realized something was wrong. She glanced at Kou Wanwan, then shouted "ah" and rushed towards Zhu Xiuyuan together. The three of them immediately fought together.

The sound of laughter and fighting suddenly rang out in the wilderness.

Zhu Xiuyuan was immediately besieged by two female fairies, but he saw graceful limbs, crooked hair, fluttering long skirt, rolling jade body, and light mist. The two women worked together, and they were as beautiful as dance, which was fascinating.

In addition, I heard bursts of laughter, like silver bells, as crisp as clear springs, full of youthful atmosphere. When I heard this, I would be numb and confused, completely trapped in this gentle land.

Zhu Xiuyuan howled, screaming and laughing, and couldn't tell whether he was uncomfortable or excited...

After playing for a while, the three of them stopped.

Because of the noisy, all three of them lay on the ground, Zhu Xiu was in the middle, and the two girls lived on one side.

Their faces were red, their breasts were undulating, and they were all lying on their backs to the sky, gasping slightly.

They were crazy about the play just now.

Zhu Xiuyuan lay for a while, and suddenly he saw that the sun had set in the west and it was almost dark.

So he said, "It's getting late, let's go and cook some prey and prepare supper first."

As he said that, he got up first.

The two women followed closely behind.

"This basin of salt water should be almost settled when we come back from hunting. Then we will take the last step!" Zhu Xiuyuan approached the copper basin, observed it carefully and said.

The three of them cleaned up, then set out together, went deep into the mountains and forests, and started hunting.
Chapter completed!