The study room is very quiet.

After a while, Xiao Ming drew the drawings, and then a few steps suddenly came from outside the study room.

"Your Highness, the old slave is back."

Hearing this voice, Xiao Ming smiled at the corner of his mouth. The person who came was none other than Qian Dafu.

This time, Xiao Ming suddenly remembered that converter steelmaking method was not a whim. The most important intention was that Qian Dafu discovered a magnesite ore in Feng China, and this ore was the material needed for alkaline furnace lining.

In 1856, the British Besmai invented the bottom-blown acid converter steelmaking method. This method was the beginning of modern steelmaking method. It produced a large amount of cheap steel for Europe and further promoted the European industrial revolution.

However, because this method cannot remove sulfur and phosphorus, its development was limited. In 1879, the Thomas bottom alkaline converter steelmaking method appeared in Europe. This method uses a converter with an alkaline furnace lining to treat high-phosphorus pig iron, further improving the quality of steel.

Because of the past, Xiao Ming went from acidic furnace lining to alkaline furnace lining. He did not introduce the converter steelmaking method before, because of the limitations of materials. Now that he has found magnesite ore, the material of the furnace lining will not be a problem.

"Come in." Xiao Ming said.

At this time, the door of the study was pushed open, and Qian Dafu walked in with a dusty look on his face. He smiled and reached out to hold a stone from his arms and said to Xiao Ming: "Your Highness, this is the magnesite mine."

Xiao Ming nodded. The ore in Qian Dafu's hand was very smooth and had a crystal similar to salt, but Xiao Ming recognized it at a glance that it was magnesite ore.

"You can't be wrong, this is magnesite stone." Xiao Ming grinned, and he said: "Now your prospecting team is getting more and more experienced. You have gained a lot in Laizhou during this period."

Qian Dafu's face was now a little dark, and he smiled and showed a mouthful of white teeth. He said, "Your Highness, who can make mistakes? But Laizhou is really a treasure land. Not only the Lingmei mine, but also many gold and silver mines were found. I'm waiting to mine below."

"This gold mine and silver mine will not move for the time being. If this magnesite mine needs to move, at least some of it must be collected for use. Now the world is in chaos. If you have silver, you can't buy anything. Bartering is the right way." Xiao Ming said in contemplation.

As Qian Dafu said, Laizhou is indeed a treasure land. Not only is the largest reserve in the country in gold mines, but the second largest reserve in the country in the country. The discovery of the magnesite was also unexpectedly discovered when looking for gold mines and silver mines.

"Yes, Your Highness, I will arrange this after I go back." Qian Dafu said.

Qian Dafu, an old butler to an ore master, has suffered a lot in the past three years. It is precisely because of his hard work that has allowed Xiao Ming to survive the most difficult time at the beginning.

Over the past period of time, the prospecting team has become more and more mature. After considering it, he decided not to let Qian Dafu go to the mines himself. After all, Qian Dafu is now in his fifties.

After pondering for a while, he said, "Dafu, when you come back this time, don't run around with the prospecting team anymore. I have established a Minerals Division in Qingzhou. From now on, you will be responsible for the Minerals Division and manage the domestic mining farms."

"Your Highness, is there anything wrong with me?" Qian Dafu looked nervous and trepidated.

He shook his head with a wry smile, Xiao Ming said, "You have thought of going somewhere, but you are old now, and your mother is not able to speak around you when she comes back from Chang'an. You have served your mother for more than ten years, and you can accompany her mother to relieve her boredom."

Speaking of Zhenfei, Qian Dafu sighed, "This Chang'an Rebellion is really pitiful to the Empress. Since that's the case, I will hand over the mining search to my nephew. Now that he has achieved success in Bowen Academy, he should let him go out for experience."

Xiao Ming nodded. When he was inspecting the mine last time, Xiao Ming met Qian Dafu's nephew. This time, Qian Dafu agreed to this matter when he mentioned him.

The master and servant said something else, and Xiao Ming took Qian Dafu to the backyard. Qian Dafu has been traveling outside for a while, but he has never met Concubine Zhen.

"Empress!"

When he saw Concubine Zhen, Qian Dafu ran over and suddenly knelt down in front of Concubine Zhen, and his eyes became sore and he started to cry.

Since escaping from death, there are only two most important people in Qian Dafu's life, one is Concubine Zhen and the other is his nephew.

He has served Zhen Fei for more than ten years. Zhen Fei is both a master and a relative to Qian Dafu.

Prince Zhen was joking with Fei Yue'er when suddenly a dark man knelt down in front of him and leaned back in shock until she realized that it was Qian Dafu.

She first gave Xiao Ming a blank look, "Ming'er, my mother asked Qian Dafu to Qingzhou to serve you. How could you let him go out to do the hard work of mining search?"

When she arrived in Qingzhou, Zhenfei asked Xiao Ming about Qian Dafu's whereabouts, and knew in her heart where Qian Dafu had gone. At this time, she couldn't smile bitterly when she saw Qian Dafu like this.

Xiao Ming originally wanted to explain, but Qian Dafu snatched the talk. He said, "Empress, your highness is because he trusts the old slave. He is not at ease to leave the mine search to others."

Concubine Zhen sighed, "You have the same temper. You have always been a good person. It's good to come back this time. When will you prepare to go back?"

"Your Highness said that you would let the old slave stay in Qingzhou and you don't have to go out in the future." Qian Dafu said.

Concubine Zhen nodded, looked at Xiao Ming and said, "Well, this is almost the same. From now on, you will talk with me to relieve your boredom. I have been here in Qingzhou for a while, but I have not left the palace. Another day, you will accompany me around inside and outside Qingzhou City."

"Empress, let me leave this to my slave." Qian Dafu said happily.

Xiao Ming breathed a sigh of relief when he saw this. Concubine Zhen has been staying in the royal palace for a while, and now she is willing to prove that she has finally gradually untied her knot.

After chatting with Zhenfei for a few more words, Xiao Ming took the drawings and went to the steel workshop. Qian Dafu came back to confirm that the magnesite was real. Now he could let go of building a converter steelmaking production line.

Once the converter steelmaking is put on the agenda, it means that a large amount of cheap steel is possible, but the only drawback is the oxygen blowing technology in the converter steelmaking.

In fact, due to technical limitations, the initial converter steelmaking was blowing air instead of oxygen, and the real oxygen blowing technology only appeared in 1952.

He has also studied industrial oxygen production. Qingzhou is currently unable to overcome this technology. Condensing the air to a maximum of 100 degrees before separation is a high technology.
Chapter completed!