When Bai Yun saw that the emperor did not speak, he was very satisfied.

From a chemical point of view, aluminum is easily oxidized, so aluminum exists in the state of alumina in nature, and it is not easy to make bauxite into alumina.

The melting point of alumina is very high, about 2,000 degrees.

It was difficult to reach this melting point in the ancient smelting state, so it was too difficult to extract, resulting in a very expensive pure aluminum.

Anyway, it's much more expensive than pure gold products.

Their Hou Mansion had a set of utensils made of pure aluminum, which their father and mother kept as treasures, and only took them out from time to time to take a look.

How did Bai Yunyi's aluminum powder come from?

In fact, it is obtained through the displacement reaction, and it is heated with metal sodium and anhydrous aluminum chloride, although it is also difficult, but it is much better than high-temperature smelting, which greatly reduces the production cost, but it is still very expensive.

As for electrolytic aluminum? Then I don't dare to think that it needs a strong current to support it, and it is almost impossible to make this kind of thing by myself in this era.

She only knew the principle and had not tried it.

If you can succeed, you will make a lot of money.

It's a pity that I only dare to think about it at the moment.

For Bai Yunyi now, selling some thermite to the emperor is just a trivial matter, and getting some aluminum products to sell by himself will definitely make a lot of money.

Knowledge can change everything.

Bai Yunyi couldn't help but sigh in her heart.

However, she will only achieve something by standing on the shoulders of those predecessors in her previous life.

In a word...... She is happy with how she is doing so far.

When the emperor saw Bai Yun standing aside and smirking, saliva about to flow out, he knew that this girl was dreaming.

What he didn't know was that he was also giggling.

The emperor wanted to stay on as before, but Bai Yunyi forcibly pushed people out.

Is the emperor feeling lost?

That's not possible, because it makes him more motivated.

I have to arrange it quickly and speed up the process, so that I can marry my woman back earlier.

The emperor had just stepped out of the Ruihua Courtyard and was about to ask Zhong He to leave, but he found Zhong He and Jiang Heng standing at the gate of the courtyard staring wide-eyed.

"Jiang Heng?" The emperor was a little unsure, after all, he hadn't seen that kid for more than ten years, and when he left, Jiang Heng was only seven or eight years old.

"Senior brother......." Jiang Heng recognized the emperor at a glance, after all, the emperor has not changed much over the years.

"Why are you here?" The Emperor asked with a look of surprise.

"I ...... I was a guard for Bai Yunyi, why did the senior brother come out of it? Jiang Heng asked in surprise.

"I'm looking for her something." The Emperor laughed.

Then the two brothers came to the side and chatted.

Jiang Heng is not afraid of the emperor at all, he only regards him as his senior brother, and the emperor is also very "loving" in front of his little junior brother.

After the two talked for a long time, the emperor asked Jiang Heng to return to Cangyun Sect, Jiang Heng was unwilling, the emperor asked him to enter the palace to stay with him, and wait for the master and his wife to come back before going back, Jiang Heng was unwilling.

"I'd better stay here and be a guard, I'll sign the deed." Jiang Heng said with a smile.

The emperor was slightly stunned after hearing this, this is Bai Yunyi's style, you have to sign a contract for everything.

"Okay." The Emperor nodded slightly.

His family Yun is very good, he will definitely not bully Jiang Heng, Jiang Heng will not be cheated if he stays here, because Bai Yunyi is very good to his own people, and the emperor is also relieved.