The rest of the students' criticism of Zhong Bai was diluted a lot because of Xu Guangxian's explanation.

This experienced academician also knows the principle that haste is not enough, and after taking the classroom atmosphere back into his own hands, he began his formal lecture today.

According to his class arrangement, the theoretical source and basic principle of the "cascade extraction method", and the process of step-by-step correction of the experiment in the middle of the course, only a small half of the time of more than two hours in the morning can be explained.

Although the comrades in the audience should have already understood this separation plan before participating in the training, Xu Guangxian still had to start with this set of theories.

This may seem repetitive, but it's not meaningless.

Because in the past few years, Xu Guangxian himself has been constantly improving this set of schemes, it can be said that today's "cascade extraction method" and the set he just came out of the laboratory in 78 years have been slightly different, and the overlapping ingredients have only about 70%, after all, the theory will be further revised with the continuous deepening of practice.

Although Zhong Bai was already familiar with several versions of Academician Xu Guangxian's "cascade extraction method", it was obtained from books after all.

And today's feeling of listening to the whole story of my scene is a completely different feeling, he listened attentively and remembered it very carefully.

After all, this is an important basic technology of the modern rare earth industry, and it can even be said that without understanding the "cascade extraction method", you will not be able to effectively separate different rare earth elements from the rare earth concentrate, not to mention the subsequent development of the rare earth metallurgical industry.

Xu Guangxian's voice was very magnetic when he was lecturing.

"Rare earth is an important non-renewable strategic resource, and it is an indispensable key element for the transformation of traditional industries, the development of emerging industries and national defense science and technology industry. Rare earth compounds that play a special role in the national economy and cutting-edge science and technology often require high purity. For example, the purity of yttrium oxide as the matrix material of color TV red phosphor is > 99.995%, the oxidation pin > is 99.99%, the neodymium oxide as a laser material is > 99.9995%, the gadolinium oxide > is 99.99% as the matrix material of X-ray sensitization screen, and the samarium oxide > is used as a samarium cobalt permanent magnet material 99.5%, etc. ”

"The chemical properties of the 17 rare earth elements are very similar, and the separation is more difficult, so the price of high-purity rare earth reagents is very expensive, from a few hundred yuan to more than 10,000 yuan per kilogram......"

“…… In order to reduce the production cost of rare earth compounds, it is required to find the cascade extraction process conditions with the best separation effect, which usually requires a lot of manpower and material resources to carry out cascade simulation and expansion experiments. ”

"In order to overcome the blindness of the extraction process trials and significantly shorten the trial cycle, we worked in Alde

On the basis of the theoretical work of s fractional distillation extraction, after years of experimental research, the theory of rare earth cascade extraction and the calculation method of optimizing the process parameters C2 and C3 are proposed......"

"Using these theoretical formulas and calculation methods as guidance, we successfully separated praseodymium and neodymium with a 20-stage complex-exchange extraction system, and obtained 99.9% purity products at both ends, which solved the long-standing unsolved problems at home and abroad......"

Xu Guangxian on the stage was not fast, during which he drank several sips of water before he finished telling everyone about the previous achievements, and everyone also bowed their heads and struggled to take notes.

"At present, the above methods are being promoted and applied in the national rare earth extraction industry, and the effect is ...... We've seen some results, and we've made some changes recently......"

Just when Zhong Bai was concentrating on listening to Academician Xu Guangxian's latest changes to the "Cascade Extraction Method", the academician suddenly closed his textbook and said.

"That's it for this morning's theory part." Xu Guang first lifted his glasses and said, "There is an arrangement that I almost forgot to explain to my classmates." ”

"What arrangement?" Everyone also raised their heads one after another and looked at Xu Guangxian with puzzled eyes.

"That's right, this training is actually not just a training, but also an integral part of one of my topics." Xu Guangxian said: "In addition to rare earth separation, I also want to take you to a company for an internship, by the way to explore the field of rare earth metallurgy, and strive to reflect the importance of rare earth separation technology." ”

"To this end, I will divide everyone into two groups, each group with a group leader and nine team members, and carry out group competitions in the subsequent study and internship process in order to obtain better research results. Of course, this also helps everyone to continuously improve themselves in healthy competition and further strengthen the effect of learning. ”

What? Want to do an internship exploring rare earth metallurgy? Do you want to compete in groups?

Hearing this, Zhong Bai's interest suddenly came up!

Because this is something that was not mentioned in the previous training notice!

That notice is still in everyone's bag, Zhong Bai doesn't need to read it to remember it clearly, at that time, it was only a general description of fifteen days of training, and the location was only written in Beijing University, I didn't expect that there would be no cave!

Sure enough, everyone was also excited after hearing this arrangement.

Those who can participate in this training are at least those who have a good understanding of the rare earth industry in their own provinces and cities, and now they have a certain degree of understanding of the basis of rare earth separation, but for rare earth metallurgy......

That's really not a lot of hands-on people!

The reason is very simple, because the development of rare earth metallurgy in China has been very slow, and there are relatively few related practitioners.

Zhong Bai vaguely felt that Academician Xu Guangxian worked hard to make up this training, and there were deeper and broader goals!

Of course, it is not clear what the specific goal is Zhong Bai, but now he just needs to quietly listen to the arrangement of the academician.

Originally, he thought that this training was just a casual observation, at most he listened to some knowledge such as Academician Xu Guangxian's relatively cutting-edge rare earth industry theory in the classroom, but now Zhong Bai feels that this is a rare opportunity to broaden his horizons!

It's not that he has forgotten the various theories of the rare earth industry in his previous life, but he really doesn't know much about the current situation of the domestic rare earth industry, after all, it is accurate to a certain year in the 80s, who will remember these in detail before?

Since it has been decided that Baifeng Group will enter the rare earth industry as soon as possible, no matter whether the funds and talents are prepared enough, it is not a bad thing to know more about domestic and foreign industry information, right?

"Here's the list of groups I've drawn up."

"Group 1: Yan Yutian, Mao Chong......"

"Group 2: Mi Bin, Zhong Bai, ......"

When he heard that his name was in the second group, and that Mi Bin from Hujiang Taiding Alloy Factory, he felt that this group was good!

Because Taiding Alloy Factory is one of the few rare earth metallurgical processing plants in China, Mi Bin, as a junior engineer of the plant, at least at present, must have more experience in practical operation than himself, and being in the same group with him means that the opportunity for learning and communication has greatly increased, and Zhong Bai naturally thinks it is a good thing.

But the next sentence made Zhong Bai feel as if things were not so good.

Because Academician Xu Guangxian continued: "Okay, the two groups of personnel have been grouped, and the team leader will be announced below." ”

"Group 1 leader: Yan Yutian."

"Group 2 Group ......"

"Zhong Bai!"