That's right!

Can't you boil salt without fire?

Look at my Wuji Immortal Venerable recruit "Sun True Fire" to boil salt!

The principle of the giant "mirror pot" is similar to that of a solar stove.

Bai Yuqi also worked in vain for a long time before he suddenly remembered that he had seen on the Internet before that France had built the world's largest solar furnace.

Directly on a concave building, a giant concave mirror made of 10,000 mirrors can heat up to 3,500 °C in a few seconds!

Although the environment, temperature, and humidity on Zhongnan Mountain are not the same as the place where the sun furnace was built in France in later generations.

But Bai Yuqi does not pursue the extreme temperature, does not require 3500 °C, and can have a 3000 °C.

He just boiled salt, not steel...... No, 3000°C is enough, right?

Bai Yuqi, who felt that he had thought of a good idea, was energetic, and began to toss with the villagers with great interest.

The first thing to change was the wall of the salt field, Bai Yuqi modified the original square city wall into a ring like the Bird's Nest Stadium, and then the interior was all covered with large curved mirrors.

This alone is not complete, and the ring arc mirror of the "Bird's Nest" alone can reach the limit temperature of 3500°C.

Bai Yuqi also led the villagers to build hundreds of huge mirror walls of different heights and heights around the "Bird's Nest" at different angles.

These mirrored walls ensure that as soon as the sun comes out, no matter what angle it rises, it will be able to refract the sun's rays into the "bird's nest" to the maximum!

This huge project is also due to Bai Yuqi, who has unscientific construction methods.

Otherwise, if the engineering team with various construction equipment in later generations is replaced, I am afraid that it will take a long time to complete.

Not to mention the masons of the Tang Dynasty, they can't build it for a lifetime...... No, even if they build it, they can't make a solar stove, they don't have mirrors!

But when it comes to Bai Yuqi, although he has only seen the pictures and design principles of the French solar furnace on the Internet in later generations, he can't do such fine calculations and designs in the construction project, but he can use [stone plastic] to modify it at any time!

Therefore, this project alone took Bai Yuqi several days of effort.

Although it will take a long time to make minor adjustments to reach the extreme temperature, once the mirror wall array is completed, the solar furnace can actually be put into use!

The interior of the "Bird's Nest" of the Kuquan Salt Farm has been turned into a sunken rock lake by Bai Yuqi.

He also enlarged the water outlet of the original rock spring, as well as a shut-off valve to control the flow of brine into the salt pond.

Although it is not possible to completely prevent the bitter spring from gushing out, it is enough to limit the flow to a minimum and build a reservoir under the outlet of the bitter spring to ensure that the brine does not continue to flow into the salt pond for a period of time.

After the arrangement was completed, Bai Yuqi announced that the solar furnace No. 1 was ready to be ignited!

It was another sunny morning, the sun had just risen, and the inside of the "Bird's Nest" was already feeling hot.

As the villagers use the lever pulley hanger designed by Bai Yuqi to open the shut-off valve, it is actually behind a square boulder pressed against the water outlet.

The brine poured out into the reservoir, and the full pool of brine, which had been stored overnight, was also opened and poured into the salt pool, and began to rise in a thick hot mist.

The brine in the salt pool began to boil and bubble under the sunlight cast by hundreds of mirrored walls.

As the sun gradually rises, even if the brine water that pours into the salt pond continues, the water level never rises rapidly, and even decreases rapidly with the sun in the middle of the day.

The surface of the water, which came into contact with a beam of light no larger than the size of a round tabletop, began to make an astonishing boiling sound, as if cold water had been poured on a red-hot iron plate, and it evaporated in an instant.

Because it is surrounded by towering circular curved mirrors on all sides, the wind cannot blow in.

Therefore, the billowing mist rose vertically and a pillar of smoke rose vertically into the sky, and was blown away by the mountain wind.

In the mountains, there is a mist of smoke, making the whole Kugu Pass like a fairyland filled with clouds and mist.

Well, although the picture is beautiful, the strange salty smell unique to the evaporation of the brine still makes people frown, but this small flaw is not a problem that needs to be solved urgently, so it will be put aside for the time being.

Because of the existence of hundreds of mirror walls, the whole mountain is almost dazzling.

Bai Yuqi, who was observing the sun furnace, had to make a pair of "sunglasses" for himself.

"Master, this is what you said, the 'Tiangang Zhiyang Nine Days Sun Furnace' that Lao Jun used for alchemy?"

I don't know that Sun Laodao came out of it, and stared at the "Bird's Nest" with thick fog with excited eyes...... Not moved, but pierced by the dazzling light.

"Eh, did I tell you?"

Bai Yuqi was stunned for a moment, and handed over a pair of sunglasses speechlessly, and the old man wiped his tears and hurriedly put on the sunglasses that looked like a big toad.

In the past few days, Bai Yuqi has been busy building a solar furnace, but he neglected his old apprentice, and he never saw his figure, so he forgot about him.

Later, I learned that this old man had been decorating the dormitory building without sleeping or eating.

As soon as he completed the task of reinforcing the load-bearing column, he immediately ran over to see the "Tiangang Zhiyang Great Array" and the "Nine Days Sun Furnace" arranged by Bai Yuqi.

Maybe the old man came to the middle of the trip, and Bai Yuqi, who was busy with work, didn't care about him, and casually recited such a sentence and was remembered by him.

As for how the Sun Furnace was connected to Taishang Laojun's Alchemy Furnace, Bai Yuqi himself had forgotten how it was made up.

While observing the operation status of the solar furnace, he casually told Yang Tieniu and others various precautions.

In fact, it doesn't matter if you don't tell you, because the entire bitter spring salt field is already hot and you can't get close within a radius of 100 meters, who will find death by yourself and come forward?

Wait until the sun sets, and the temperature inside the salt pan gradually drops.

The villagers of Kushui Village rushed into the salt pan in a swarm of heat, but they were stunned by the mountains of salt crystals piled up in the salt pan like a small lake!

According to rough estimates, the solar furnace can get thousands of stones of salt a day!

It sounds scary, but it's actually only a few hundred tons.

The people who had been busy all night were excited, but the people of No. 100 couldn't clean up all the pools of salt crystals overnight, so they could only watch the sun rise again, and the high temperature forced everyone out of the salt field.

Yang Tieniu was even more excited, and immediately summoned the young people in the village, ready to transport a batch of salt to the city to find large households to exchange grain and hire homeless people.

And Sun Laodao, who had been a decorator for several days, was also energetic and ready to follow the Kushui Village caravan to Chang'an.