Chapter 1043: Teacher Gan, who waited until the clouds cleared and the moon appeared
In the guesthouse of the Third Rolling Mill, the comrades from Shu Province and Gansu Province, who were running out of food and ammunition, were finally unable to hold on.

In theory, the current food situation is indeed much better than what Gao Zhendong knew in his previous life, but it is not good enough to cancel the coupons. Moreover, even if it is enough, there will still be some time before the coupons are canceled. Policies have inertia.

After staying here for a few days, the only thing left for the comrades was to go to the black market to get tickets.

The comrades at the Third Factory all have a very good attitude and are very supportive of the work, but since Chief Engineer Gao is not here, there is really no way to change it.

But the tickets were not a big deal. The comrades of the Third Branch Factory would not let the comrades go hungry. It was no problem to give them some tickets to help them. The conditions in the Third Branch Factory were very good. Even compared to the whole capital, there were not many places better than here. It would be a complete joke to let the visiting comrades go hungry here. It would be a disgrace to the Third Branch Factory.

"Teacher Gan, I'm really sorry. I confirmed with the comrades from the Third Rolling Mill before coming here, and Chief Engineer Gao is here. I didn't expect he had to go on a business trip." In the guesthouse of the Third Rolling Mill, the comrades from the Mining and Metallurgy Department also felt very sorry. After all, time is limited, and it is impossible for them to stay in Beijing for a long time waiting.

Teacher Gan also knows about this, I can't really blame him. It's much more convenient now. For such large units, you can confirm before coming. If it were in the past, you would have to keep silent and wait and see after you get there.

I didn't expect that even though it was confirmed, he was out for something. How can I complain? It's normal for a comrade of Chief Engineer Gao's level to have something wrong.

"It's just a coincidence, I can't blame you. But what are we going to do next?"

"Wait a little longer, we're already here." These days, the words "we're already here" are much more lethal than they would be decades later. Transportation is inconvenient, and it's not easy to come here. If you don't finish your business, it will be difficult to leave.

"Well, let's wait a little longer. Fortunately, the work in my school is arranged quite clearly, so there won't be any problems if we wait a while." Obviously, Teacher Gan thought so too.

"Ding-ling-ling~~~~~" Just at this moment, the phone in the room rang.

The comrade from the Mining and Metallurgical Department went to answer the phone while thinking in his heart that a big unit is a big unit and every room in the guesthouse has a telephone, and it is the push-button dial type.

It may be difficult for other units to get a set of programmable switching systems from the Postal and Communications Commission, after all, this thing is in extremely short supply now, but it is obvious that the Third Factory is not included in it. Even the Third Rolling Mill and the entire Seventeenth Ministry of Machinery will have to benefit from it.

"Well, hello... Yes, it's me... Really? Great! We will go find him right away." The comrades from the Mining and Metallurgical Department were delighted.

He put down the phone and said to Teacher Gan, "He's back, he's back. Chief Engineer Gao came back yesterday and will be back to work today. Comrades from the Third Branch Factory notified us to go look for him!"

"Really? Let's go, let's go!" Teacher Gan picked up the black leather bag and ran away with the comrades from the Mining and Metallurgy Department.

Twenty minutes later, Gao Zhendong sat in the reception room with several comrades, feeling a little embarrassed: "Oh, I really didn't expect that I had to work temporarily. I'm sorry to have kept you waiting for so long."

"It's okay, it's okay, Chief Engineer Gao. Work is important. We have only been here a few days." The comrade from the Mining and Metallurgical Department had met Gao Zhendong last time with the leaders of Sichuan Province and was quite familiar with him.

"Well, anyway, there's still a delay, sorry, sorry. Come on, Teacher Gan, I won't waste your time, let's talk about business." Gao Zhendong said.

When he learned that Teacher Gan was a comrade from Shu Province who was unable to find anyone familiar with the field of chelating resins in Shu Province and was invited from Ganlong, he could not help but have a higher opinion of the initiative of the comrades from Shu Province. They really wanted to do something.

Having obtained something, one is greedy for more.

This is almost a must for the comrades in Shu Province. According to what Chief Engineer Gao said that day, if they can't find such a comrade, the matter will be a failure, at least for Shu Province, so they tried their best to find Teacher Gan.

"Okay, okay, Chief Engineer Gao, thank you for giving us this opportunity." Teacher Gan not only seems to be proficient in his work, but also has basic interpersonal skills. He is not the legendary nerd. In fact, there are very few nerds among the teachers in the university.

"Do you understand the general situation?" Gao Zhendong asked.

"Yes, I understand. To be honest, in this regard, although I dare not be polite to say that I am relatively advanced nationwide, I only have a superficial understanding. I know about this direction and have done some research, but I have not gone deeper into it." Teacher Gan spoke very honestly.

"It doesn't matter, it doesn't matter. It's good to understand. Many of our comrades are learning while working. This time, I want to develop amidoxime chelating resin, which is mainly aimed at the chelating extraction of two types of metal ions, indium and gallium. Of course, this does not mean that amidoxime can only adsorb these two types. In fact, the chelating range of amidoxime is very wide, and the prospects are still very good." Gao Zhendong introduced his ideas.

So that's how it is. No wonder he wanted to find someone who was familiar with amidoxime from the beginning.

Gao Zhendong turned to the comrades from the Mining and Metallurgy Department and said, "The adsorption of gallium is aimed at the bauxite mines and aluminum electrolytic plants in Qianshan Province. Gallium can be extracted from the mother liquor of the front-end process of aluminum electrolysis. And indium is aimed at the lead and zinc mines in you and Caiyun Province. Indium can be extracted from them, which is also a very valuable special metal material."

Different mines have different associated minerals, and lead-zinc mines are rare in Qianshan, but they are abundant in the surrounding areas, especially in Caiyun Province. When the comrades from the Sichuan Provincial Department of Mining and Metallurgy heard this, they were very happy. Chief Engineer Gao directly combined production and research, and with the help of Teacher Gan from Jincheng University, the combination of production, learning and research has many ways to go.

Sure enough, you can’t go wrong by listening to the great experts in the department.

"Thank you so much, leader. You have shown us a clear way forward." He was not flattering him by addressing him this way. The head of the Mining and Metallurgical Department was not there, so other comrades had to call Gao Zhendong "leader" when they saw him.

Gao Zhendong smiled and asked Teacher Gan: "Have you ever actually studied the preparation of chelating resin?"

Teacher Gan nodded and said, "It has been prepared, but not the kind you are talking about." He only knew about amidoxime when he saw it, and he had not studied it much before.

Gao Zhendong was relieved: "It's good that you have prepared it. Anyway, there is a certain foundation. I believe you can always find a way."

Teacher Gan was a little confused after hearing this. What did it mean to always find a way?
But he soon found out what Gao Zhendong meant by this.

Gao Zhendong gave him many paths to prepare slightly different amidoxime chelating resins.

"… using ammonium cerium nitrate as an initiator to prepare a copolymer of polyacrylonitrile grafted with sago starch, the copolymer reacts with hydroxylamine in an alkaline solution to convert the nitrile group into an amidoxime functional group…"

This first path allowed Teacher Gan to directly master the route to obtain amidoxime. While recording, Teacher Gan shouted in his heart that it was a good opportunity. This one path was worth the trip. He could get this technology in a few days. If the teachers in their school heard about it, they would probably be envious.

As for how Chief Engineer Gao knew that this route was feasible, haha... unless you are a fool, you would not ask this question. As for the specific implementation, you have to rely on yourself. If others have given you the opportunity and you still can't do it, then you can only blame yourself for being incompetent.

"…If you can prepare it, you can also consider using acrylonitrile and divinylbenzene to synthesize a network resin containing different functional groups. The nitrile group in the resin reacts with hydroxylamine, hydrazine and ethanolamine respectively to obtain a resin containing multiple functional groups such as amidoxime, amidrazone and oxazoline. If this route is used, different chelating functional groups can be obtained by using different modification methods…"

Gao Zhendong's words made Teacher Gan very happy. He didn't expect that in addition to amine oxime, Chief Engineer Gao also gave him two more as a gift. He felt so embarrassed. Why did he give him such a gift?

Teacher Gan’s mouth was split open with laughter.

Gao Zhendong spoke one by one, and Teacher Gan wrote them down one by one. Only then did he realize that there were far more than amidoximes, and he had mastered many methods for preparing or modifying chelating functional groups.

This was not Gao Zhendong showing off intentionally. The main reason was that since the other party had come and waited for so many days, he would feel bad if he didn't give them something. Secondly, the first paper he found was a review! Then he followed the clues and found a lot of other papers.

The review is probably at the bottom of the paper contempt chain, but Gao Zhendong likes the review at this time. The review is good because it explains all the circumstances and origins clearly, which is really convenient.

As for the fact that the reviews are all summarizing other people's old things, this does not exist for Gao Zhendong. Old things that were made decades ago are now the absolute future technology.

Gao Zhendong was happy, and Teacher Gan was even happier, especially when he began to hear the term "fibrous chelating agent".

"Chief Engineer Gao, fibrous chelating agents? What are the advantages compared to resin particles?"

Before this, the resins he knew about were all in granular form, but when he heard about the fibrous form, it suddenly opened the door to a new world for him.

Gao Zhendong smiled and said, "Just think about it. The fibrous shape means that this thing has a large specific surface area, which can bring advantages such as large adsorption capacity, easy elution, and easy regeneration. So, if it can be done, my suggestion is that in terms of the form of the chelating agent, you can go in this direction, for example..."

Gao Zhendong also gave a bunch of examples of using various monomers to synthesize fibrous chelating agents.

"... This macroporous fiber amidoxime polymer adsorbent is synthesized by radiation-induced graft polymerization using acrylonitrile and hydrophilic methacrylic acid as monomers and polypropylene fiber as substrate. You can pay special attention to it and try to adsorb seawater at a pH of 6..."

Gao Zhendong said to Teacher Gan with a bit of mystery.

"Seawater? What does it mainly absorb?"

(End of this chapter)