"What do you say? Misfortune to the east? Obviously, the criticism in Zhong Bai's interjection was understood by Yan Yutian as an attack on him, and his face immediately changed: "What's wrong with this approach?" There are precedents in other provinces and other industries, and they do not violate the relevant regulations of the state, why do you come here and the words become so ugly? ”

Of course, Zhong Bai knew that Yan Yutian was not lying, which was also one of the usual methods used by many rare earth companies in the early 80s.

Because of the indiscriminate mining and processing methods, the rare earth industry itself is very polluting to the environment, but in order to pursue profits, in order to pursue profits, without using those illegal means (such as concealing data, or bribing relevant officials through special means), this method of transferring waste is indeed relatively common, at least on the surface, it is legal.

But its biggest problem is that it does not fundamentally solve the objective impact of fertilizer pollution on the environment, scatters and piles up waste, and the most important thing is to expand the pollution surface.

Zhong Bai has personally witnessed the complete development process of Huaguo Industry from "high pollution and low output" - "high pollution and high output" to "low pollution and high output"!

At the beginning, our country did not pay attention to environmental pollution from top to bottom, and blindly only sought profits, but when the side effects of environmental pollution began to appear, we had to spend several times or even dozens of times more than the original price to control pollution!

This model of development first and governance later, which is also the course that the vast majority of industrial countries have gone through, seems to be inevitable.

But think about it a few decades later, when the big leaders proposed that "lucid waters and lush mountains are invaluable assets", the country will have to spend countless costs to restore these polluted areas to clear waters and lush mountains, and the price is really too great!

This knowledge is common knowledge for industrial people in the 21st century, but for people in this era, they will think that you are simply pedantic.

But Zhong Bai would not give up his principles because of the other party's questioning, only to see him say loudly: "The environment of the Baiyun Obo mining area should be protected, so shouldn't Beihe Province?" Everyone is a Chinese person, and the future generations of any piece of land should have a clean environment! ”

"Heh, who wouldn't tell the truth?" Seeing that Zhong Bai didn't flinch, Yan Yutian was still stiff-mouthed: "Then tell me, what other good way is there?" Could it be that you don't use the high-temperature concentrated sulfuric acid roasting method to process rare earth concentrates? ”

In fact, Zhou Changqing was quite sympathetic to Zhong Bai's point of view, and of course he knew that Yan Yutian's suggestion could be used as one of the ways to deal with it, but he didn't do it.

Because as Zhong Bai said, if you use this method to make money with your conscience now, what can you use to make up for the damage caused to the children and grandchildren of the polluted land?

Seeing that the smell of gunpowder in the conversation between the two was getting stronger, Xu Guangxian had no choice but to stand up and play a round: "Okay, let's discuss this issue here, the views of the two students have their own starting points, but the actual operation of the enterprise needs to consider all aspects......

Just as he was about to change the next question, Zhong Bai suddenly spoke up again: "Academician Xu, I haven't finished answering this question just now. ”

Xu Guangxian and Zhou Changqing focused their attention on Zhong Bai at the same time.

It seems that this is indeed the case, just now he just refuted Yan Yutian's method, and he hasn't said his own thoughts yet!

"You speak." Xu Guangxian replied patiently.

Zhong Bai glanced at Yan Yutian, turned his head and said, "Actually, we can solve this problem by improving technology. ”

"Say it lightly! Academician Xu has not proposed any improvement techniques in this regard, where do you get your confidence......" Yan Yutian was about to continue, when he suddenly realized that this sentence seemed to be ambiguous, and immediately stopped: "Academician Xu, I didn't mean that......"

"It's okay, then let's listen to Comrade Zhong Bai and see if there are any good ways to improve the technology." Xu Guangxian didn't care, as long as he really had a good idea in terms of technology, a person like him who was engaged in technology wouldn't care about a sentence or two at all.

"We can use the low-temperature roasting and decomposition process of sulfuric acid to replace the previous high-temperature concentrated sulfuric acid roasting method." Zhong Bai smiled slightly and said.

"Sulfuric acid low-temperature roasting and decomposition process?" Xu Guang paused for a moment before asking.

There has always been only high-temperature roasting, where can I drill a low-temperature roasting?

The other students also cast puzzled glances at Zhong Bai, which means that you have made a mistake and made up a concept out of thin air?

But Zhong Bai then began to explain all this: "As the name suggests, the biggest difference between it and the high-temperature concentrated sulfuric acid roasting method is the temperature at the time of reaction. ”

"We all know that the reaction of concentrated sulfuric acid to decompose rare earth concentrate is an endothermic reaction, and the roasting temperature is high, which can strengthen the decomposition and improve the decomposition rate. However, with the increase of temperature, when it reaches a certain value, that is, 200 degrees Celsius ~ 300 degrees Celsius, phosphoric acid is dehydrated into pyrophosphate, and insoluble neodymium pyrophosphate is generated, which exists in the slag. ”

"To ensure that the concentrate is completely decomposed, but also to avoid the above phenomenon, we need to come up with a way to solve the generation of waste residue."

"Through the latest experimental results brought back by a European friend of mine, according to the different grades of the ore, the ratio of mineral acid is set between 1:1.2~1:1.7, specifically based on the results of the concentrate itself, the roasting temperature range is reduced to 150 degrees Celsius ~ 300 degrees Celsius, which can ensure that the rare earth leaching rate in the water leaching solution reaches more than 95% on average, which is equivalent to the efficiency of the existing high-temperature concentrated sulfuric acid roasting method, but the radioactivity of the discharged waste residue is greatly reduced, even lower than 7.4*10^4Bq/ KG, fully compliant with the standards of the European Community! ”

"What?! Can this effect be achieved?! After listening to Zhong Bai's introduction, Xu Guangxian took two steps back, so shocked that he almost didn't stand firm!

"Yes, at least that's how the lab feedback works." Zhong Bai said affirmatively.

Zhong Bai has stabbed the real hornet's nest now!

Think about it, in addition to Academician Xu Guangxian, a big bull with particularly solid scientific knowledge, that is, Zhou Changqing, the director of the factory who has accumulated rich practical experience for a long time, or the remaining 19 outstanding rare earth talent seedlings selected from all over the world, which one will not understand what he just said?

If it can really achieve the effect that Zhong Bai said, it is no longer a simple matter of reducing the cost of the enterprise, but ......

Huge profits!

The gap between polluting the environment and having to pay high disposal costs to waste that meets the European Community emission standards is self-evident!

"It can't be, right? Is there such advanced technology now? ”

"Didn't you hear what he just said? It's on the European side. ”

"The Europeans are really far ahead of us in rare earths!"

A burst of exclamations came from the crowd, and Yan Yutian's face, which was still aggressive just now, was already swollen and red, and it took a long time to hold back a sentence:

"Zhong Bai, your cowhide is blowing too big! I don't believe it! I'm going to call back to the unit and ask! ”

After speaking, before everyone could react, Yan Yutian had already turned around and hurriedly left the workshop!