On Sunday afternoon, Chen Tao brought more than a dozen kilograms of sulfuric acid residue from home, full of snakeskin bags, saying that this thing doesn't need money anyway, so he will pick up more for nothing.

Zhang Yi couldn't cry or laugh after getting it, thanks to Chen Tao's good strength, it was not easy for these more than ten kilograms of sulfuric acid residue to be taken from home to school.

Zhang Yi's experiments require high precision, a few grams of samples can complete an experiment, even if the systematic experiment is done, he estimates that a few kilograms of mineral samples are more than enough, Chen Tao got him more than ten kilograms can not be used up at all.

The sulfuric acid residue that he had been waiting for a long time had arrived, and Zhang Yi couldn't wait to go to the laboratory to do the experiment, but at this time he was also entangled in his heart, whether to do the experiment on Professor Zhong's side or Professor Li's side.

If he went to Professor Li's side to do experiments, Professor Li would definitely open the door for him to be convenient, and various conditions would also meet him, after all, Zhang Yi had helped him a lot in the sunscreen project.

However, it is inconvenient to do mineral experiments in the materials laboratory, such as crushing large sulfuric acid slag into small pieces, you have to use the jaw crusher in the laboratory, and the School of Materials may not have suitable experimental equipment.

In addition, there are ready-made experimental agents in the mineral laboratory, Zhang Yi does not need to prepare again, he can use it directly, and now he has the permission to directly register with the laboratory administrator to use the laboratory.

After thinking about it, Zhang Yi decided to go to the Shiseiin laboratory after dinner, and there were very few graduate students in the laboratory who were still working overtime after dinner, most of them did experiments during the day and played other things at night, and no one who had time was willing to soak in the laboratory.

Zhang Yi is mainly worried about being seen, after all, he uses the school laboratory to do his own private work, and the experimental equipment and drugs used are all other people's, so it is better to keep a low profile.

After dinner, Zhang Yi took out some sulfuric acid residue evenly in a plastic bag, put it in a backpack, and came to the laboratory with the bag on his back.

The experimenter of the laboratory is a female teacher, surnamed Zhu, in her 30s, a graduate student of the vice president of the college, who stayed in the school as an experimenter after graduation, and is responsible for managing the laboratory of the entire college.

Before the crossing, Zhang Yi was very familiar with Teacher Zhu, this familiarity is not because of how good Zhang Yi is, but because Teacher Zhu has a very bad impression of him, the door of the college will be closed at 10 o'clock in the evening, Zhang Yi belongs to the long-term stay in the laboratory, and every time he has to urge several times before he is willing to leave, so that Teacher Zhu always can't get off work on time, and he has been on Teacher Zhu's blacklist.

Now that I met again, Mr. Zhu had no impression of him at all, and Zhang Yi was just a junior who had just started entering the laboratory at this time.

When Zhang Yi was about to register in the notebook, he heard Teacher Zhu muttering in a low voice: "Are the current undergraduates so diligent?" It's so late and another ......."

Zhang Yi glanced at the registration book and found the word "Xia Jingyan", but he didn't expect the quiet scholar beauty to come to the laboratory to do experiments at night.

If it were someone else, Zhang Yi might have canceled this experiment, his experiment needed a certain degree of concealment, but Xia Jingyan's words should be fine, she wouldn't go to the teacher to sue him, right?

After receiving a bunch of laboratory keys from Teacher Zhu, Zhang Yi walked straight to the laboratory.

In the hallway, he saw a laboratory in front of him with the lights on, and the crushing, sample preparation, roasting, and testing experiments he planned to do needed to be done in different laboratories, but the most critical and time-consuming experiments needed to be carried out in the laboratory with the lights on in front.

Knowing that Xia Jingyan was in the laboratory, Zhang Yi walked inside, and when he arrived at the door, he saw a busy figure, Xia Jingyan did not wear a white dress this time, but changed into a white lab coat, and her originally petite figure looked even more delicate and cute.

Zhang Yi knocked twice on the open door and walked in, and said hello to Xia Jingyan: "Beautiful scholar, are you still experimenting so late?" ”

Xia Jingyan had already turned around when she heard the footsteps, and when she saw that it was Zhang Yi, she was a little surprised and said, "Zhang Yi, why don't you come to the laboratory." ”

"Of course, I came to the lab to do experiments." Zhang Yi said with a smile, I originally planned to do the experiment at night quietly, no one bothered, but now it's good, there is a big beauty in the laboratory, but with a beautiful woman as a companion, maybe it will not be so lonely.

"Experiments? Do you also want to do an experiment on tungsten molybdenum separation? Xia Jingyan was puzzled, she was in the same research group as Zhang Yi, and the first thing that came to mind was that Zhang Yi would do this experiment like her.

Zhang Yi shook his head and said, "No, I've been interested in pyrite recently, so I want to study it." ”

Zhang Yi didn't say anything about sulfuric acid slag, but talked about pyrite, saying that he was afraid that people who studied sulfuric acid slag would associate more things.

"Pyrite? What does that look like, I haven't seen it yet, can you show me? Xia Jingyan said curiously.

"Not really, but there is sulfuric acid slag, a by-product of pyrite, do you want to take a look." Zhang Yi took out a bag of black things from his backpack and slammed it on the experimental table, which seemed to be quite weighty.

Xia Jingyan took the sulfuric acid residue in her hand, looked at it carefully for a while, and pouted: "This is the sulfuric acid residue?" What a black thing, so ugly! ”

Zhang Yixin said Don't look ugly about this thing, it's a huge fortune, and you don't understand it as a girl.

Although gold is expensive, but the amount is small, a ton of stone has a gram of gold has the value of mining, but pyrite is different, not only the output is very high, but everywhere, sulfuric acid plants have to worry about how to deal with it.

Pyrite, as bright as gold glowing, girls usually like shiny, beautiful things, this black mass obviously does not attract Xia Jingyan to like, only after watching for a while, he lost interest, threw the sulfuric acid slag on the table, and went to do his own experiment.

The two of them are safe and busy.

Zhang Yi took the sulfuric acid slag samples to other laboratories to crush, grind, dry, and prepare samples, and it took him more than an hour after a round of experiments.

When I returned to the original laboratory, I found that Xia Jingyan was sitting in a chair in a daze, staring at the experimental equipment in front of him with a sad expression.

Zhang Yi put the prepared sample on the experimental table, ready to do his own experiment, and felt that Zhang Yi was back, Xia Jingyan came back to his senses.

"What's the matter? What are you worried about? Zhang Yi asked casually with the experimental instruments he needed.

Hearing Zhang Yi's question, Xia Jingyan's eyes lit up, and she vaguely remembered what Zhang Yi said to her the last time she met Zhang Yi in the library, and felt that Zhang Yi knew a lot of things, and maybe there was a way to solve her confusion.

Xia Jingyan came over, her big eyes were shining, and she asked with a curious baby look: "Zhang Yi, when the slurry is separated, why are there still many cases that are mixed with each other?" ”

"What mine? Is the dispersant added? ”

"Wolframite, added."

"What's more? What concentration? How much? ”

"Sodium hexametaphosphate solution, 0.5M/L, 5mL."

"The concentration of sodium hexametaphosphate remains unchanged, add 20mL, and then add 10mL of water glass."

Zhang Yi kept moving in his hands, holding a beaker, weighing samples, preparing solutions, setting up instruments, and answering Xia Jingyan's questions while doing his own thing.

Obviously, Zhang Yi is so familiar with wolframite that he can't be more familiar with it, and he can solve Xia Jingyan's problem casually.

"Really?" Although she listened to Zhang Yi say it very firmly, Xia Jingyan still couldn't believe it, she tried for a long time and had no clue, Zhang Yi could solve it casually?

"You'll find out if you try it." Zhang Yitou didn't go back to the tunnel.

There is not much time, and Zhang Yi is not in the mood to instruct Xia Jingyan on what to do in the experiment, he has to leave the laboratory before ten o'clock in the evening, Zhang Yi doesn't want to be driven out by Teacher Zhu again.

Although there is not much time, it is still no problem to do some basic mineral property analysis, and Zhang Yi has sped up the speed in his hands.

Xia Jingyan saw that Zhang Yi didn't mean to give guidance in person, and seeing that Zhang Yi seemed to be very busy, she was embarrassed to speak, so she ran to the experimental cabinet to get the medicine and re-prepare the solution.

Zhang Yi's experiment was carried out in an orderly manner, he estimated the time, arranged the experiment to the amount that could be completed before ten o'clock, and did it step by step.

Less than half an hour later, Xia Jingyan ran back again.

However, Xia Jingyan suddenly became attentive, seeing that Zhang Yi had no water in the bottle, he took the initiative to fill it with water, put it in Zhang Yi's hand and said softly: "Zhang Yi, you are so powerful." ”