I saw Li Zhi holding a piece of ore in his hand, which was bright and shiny, exuding a light copper color and a bright metallic luster.

Seeing this, a student said in a loud voice: "Your Highness, this is gold!" ”

"Gold? Wrong. Seeing this, Xu Zhou's eyes narrowed, vetoed his first feeling, and then looked for what it was in his brain memory, and suddenly realized for a moment, then stood up and affirmed: "Ren Xiao, this is not gold!" Then he immediately said to Li Zhi: "Your Highness, this should be pyrite!" ”

When Ren Xiao heard Xu Zhou deny him, his eyes suddenly widened with anger, and he felt that he had lost face, so he wanted to refute it.

But at this time, Li Zhi smiled, interrupted Ren Xiao's action, and then said: "That's right, classmate Xu Zhou is very right, this is pyrite!" ”

After a pause, Li Zhi was very curious, and then said, "Classmate Xu Zhou, tell me where you saw that it was pyrite." ”

Xu Zhou saw that Li Zhi intended to test him, so he stood up and said calmly: "The student just saw it at first glance and mistakenly thought it was gold, but after a closer look, he found that it seemed to be the same as the pyrite that the student saw in the storage warehouse. ”

After Li Zhi heard this, he was not pleased, this Xu Zhou was really a good seedling, and then smiled: "Yes, yes, because this pyrite looks like gold, and it is known as fool's gold, if you don't identify it carefully, it will be difficult to distinguish, so it is inevitable that Ren Xiao will make a mistake, no harm, no harm!" ”

Ren Xiao saw that Li Zhi didn't blame him, and he felt a little better in his heart, but he was quite dissatisfied with Xu Zhou.

"Alright, let's start experimenting! After this experiment, you will start preparing the sulfuric acid separately and putting it into production. ”

Dare to let these students see an experiment and start operating alone, which is also what Li Zhi relies on, because he found that these students' theoretical knowledge and ability to get started are very solid, and they can be successfully operated at one time, after all, the experiment is to continue to explore again and again, and continue to grow in the exploration.

Saying that, Li Zhi took out a bottle of pyrite slag out of nowhere, and then pointed to the bottle and said: "These are pyrite slags, ground them in advance for later use." ”

The pyrite slag was ground by the hydraulic workshop by the Wei River under Li Zhi's instructions in advance, although the grinding effect was good, but the wear rate was too high, which was too unfriendly for grinding the cutter head.

Looking at the students looking at the operating table with a curious face, Li Zhi nodded with satisfaction, and then carefully put the pyrite slag into the test tube, which is not a simple test tube, and the other end of it is connected to a beaker, which is filled with water, and then put the test tube on the iron frame, after fixing, and then move the alcohol lamp over, light it with a fire fold, and start to heat it.

With the advent of the still, the alcohol lamp has appeared on the stage, with the heating of the alcohol lamp, after a while, I saw the pyrite slag gradually decompose, and then the water in the beaker on the side is bubbling with small bubbles, because the sulfur dioxide colorless gas generated by pyrite is slowly dissolved in the water to form sulfuric acid.

Looking at the success of the experiment, Li Zhi nodded with satisfaction, then simply packed up the experimental equipment, pinched the beaker with his hand, and then picked it up and said to everyone: "The experiment is successful, this is sulfuric acid!" ”

With the success of the experiment, the students were excited, they just saw the whole process in their eyes, and they didn't dare to blink their eyes, for fear of missing something, so they probably had the bottom in their hearts, and they wanted to try it with confidence.

Seeing this, Li Zhi said: "This king has already operated it once just now, and then you all have to give it a try!" But remember to be safe, this is sulfuric acid, no jokes! ”

"Yes, Your Highness!" The students also knew that this sulfuric acid was extremely corrosive, because it was recorded in the textbook written by Li Zhi.

Then Li Zhi began to distribute pyrite slag, and after the distribution was completed, he began to stand aside and watch the students operate.

After a class, Li Zhi basically stood on the sidelines and watched, these students were very receptive, and there were no mistakes, all of them successfully prepared sulfuric acid, everyone held the beaker with excitement, and Li Zhi was frightened, can this sulfuric acid not be shaken...

Seeing the successful conclusion of the experiment, Li Zhi stood on the podium and said: "Everyone is familiar with the preparation of sulfuric acid, so the next task is to be completely proficient in it, and it can be put into production, can it be completed?" ”

"Yes!" Everyone shouted in response, and the joy in their hearts was all revealed.

For them, this is His Highness's recognition of them, and it is enough to be able to serve His Highness and share his worries.

Li Zhi was pleased, not only these students at the moment, but also the large-scale industrial base of tens of thousands of people in the entire Foundry Bureau, all of them were his foundation, and it was he who was loyal to him, King Xin!

Thinking about it, Li Zhi had unconsciously walked out of the classroom, came to the gate of the Casting Bureau, and looked at the Casting Bureau in the blue-brick and black-tiled high-walled compound, Li Zhi came to his senses.

As soon as he turned his head, he met Zhao Jiujiang head-on.

"Your Highness!" Zhao Jiujiang said respectfully.

As soon as he saw Zhao Jiujiang and Li Zhi, he couldn't help but ask, "How is this machine made?" ”

Zhao Jiujiang shook his head and said helplessly: "Your Highness, we have tried too many times, and found that it is not our casting process that is not good, but the reason for this material, not only the core, but also the spring, according to your highness, we have assembled a flintlock pistol, but the gun was scrapped after only firing once." ”

Speaking of which, Li Zhi waited for a while, looking for the relevant reasons from the crystallization of civilization, and at a glance, he was annoyed, it turned out that the material of this machine core and spring steel is not a simple steel, and some other elements need to be added to it, such as carbon, fierce, tungsten and other elements to form alloy steel.

Li Zhi nodded and said, "Okay, this king knows, you come to the palace tomorrow, and I have something important to discuss with you." ”

After speaking, he hurriedly left, Zhao Jiujiang saw Li Zhi leaving, shook his head helplessly, and also turned to leave.

Li Zhi was walking on the road, thinking about it, secretly pondering, it seemed that he had to go to look for minerals.

Originally, Li Zhi didn't want to look for minerals, because this is a chore, and the time and cost is very high, so it has not been put on the agenda, but today I know why there is a flintlock pistol drawings have not been successfully produced, Li Zhi still decided to carry out mineral prospecting, of course, he also had a plan to prospect.

Because the Great Xia Dynasty actually has a lot of Ming mines that have begun to be mined, for example, the second prince Li Jie has a lot of ore veins, and the prince also has them, but only Li Zhi does not have a single ore vein in his hands, and the iron ore in the fief is still controlled by the Su and He families.

Since the He family severed contact with Li Zhi, the iron ore used by the Casting Bureau was purchased from the Su family, because it was a monopoly business, so the price of the Su family's iron ore has been up and down, relying on the monopoly business to arbitrarily set prices, but it can find a suitable excuse to increase prices, but it is impossible for the Foundry Bureau not to use iron ore, so it can only accept it.

So Li Zhi had already had a plan to look for minerals, why bother asking for people, he kept thinking about it, and Li Zhi returned to the palace.