"Take zircon powder as an example, it is not actually zircon powder in 10 percent, Jiang Yaowu reached out and took out a fountain pen from his briefcase" and drew it for Lin Yuanfang on the manuscript paper, "In addition to Haoying powder" generally contains a small amount of rutile and monazite. ”

"Well, you go on." Lin Yuanfang nodded, reached out to pick up the boiling water bottle, filled Jiang Yaowu's teacup with water, and leaned his head over with interest to watch Jiang Yaowu explain to him.

Jiang Yaowu spoke at this time, and he didn't notice the detail of Lin Yuanfang adding water to his teacup, but continued to draw on the manuscript paper with a pen: "Zircon powder is actually processed from zircon stone into Haoxin sand and finally processed into zircon powder. Because there is still a small amount of rutile and monazite in the Haoying stone mine itself, the processed zircon powder also contains these two things. Although the content is very small, these two substances are the culprits that cause the yellowing and redness of the ceramic embryo body. In contrast, the raw ore of Hao dioxide is much purer and contains almost no impurities", so the whitening effect is very pure. ”

"I see." Lin Yuanfang chin and said, "Then is there a way to eliminate the rutile and monazite contained in the wrong English powder?" Separate these two substances, so when whitening, won't the ceramic embryo body be red and yellow? ”

"Yes, many experts in the ceramic industry think like this, and they have the idea of this aspect." Jiang Yaowu said, "Because the density of impurities such as rutile and monazite is greater than that of Haoying, many people have tried to crush zircon and process it to a fineness of more than 30,000 meshes with a thunder mill, and then use the centrifugal principle of a centrifuge to remove rutile and monazite in zircon powder. However, they also found that the zircon powder with rutile and monazite removed was used as a whitening agent for the ceramic embryo body, and the sè of the ceramic embryo body was not red and yellow, but the sè was black and gray, and the effect of the dioxide was still not comparable. In the laboratory, it is impossible to detect what the cause is, so the experts are discouraged, "thinking that it is a problem with the chemical xìng of zircon powder itself, and the high-purity zircon powder is easy to be black and gray after high-temperature calcination" This defect is not changed. Therefore, in the ceramic industry, everyone has reached a unanimous consensus that zircon powder can only be used as a whitening agent for low-grade ceramic products, and the whitening agent for high-end ceramic products can only use expensive fault dioxide. ”

"So, how did you solve this problem? This silicic acid mistake is also processed by Haoying powder, how can it achieve the effect of Hao dioxide? "Although Lin Yuanfang is already the head of a county in the dignified Baiqiang County", he couldn't help but be aroused by Jiang Yaowu's curiosity at this time, and he was eager to know how Jiang Yaowu researched this silicic acid mistake and solved the problem of zircon powder itself being black and gray.

"We Chinese people have a saying" called, "The difficult will not, the will not be difficult" Jiang Yaowu said with a smile: "If you want zircon powder to achieve the whitening effect of dioxide pin, in fact, the method is quite simple" is like a layer of window paper, it will be broken when you poke it. It's just that many people don't think of this layer" so they are stumped. ”

Which way is zircon powder Lin Yuanfang was completely attracted by Jiang Yaowu's words. If this problem can be solved, "Wouldn't Baiqiang County be able to use zircon powder as high-grade ceramic raw materials?" The cost has dropped so much, "The competitiveness of the ceramic products of Baiqiang County and even the ceramic products of Beiguo City in the domestic market will not be greatly improved?"

"Pickling?" Jiang Yaowu wrote two big characters vigorously on the manuscript paper with a fountain pen.

"Sour spots" Lin looked at Jiang Yaowu suspiciously.

"Right" is pickling! Jiang Yaowu nodded and said, "First process the wrong stone into zircon powder with a fineness of more than 30,000 meshes, and then use a centrifuge to remove trace impurities such as rutile and monazite" and then remove the impurities such as rutile and monazite and soak the zircon powder with hydrochloric acid or sulfuric acid in an appropriate proportion" Finally, after drying treatment, the whitening effect of the product obtained can be completely comparable to that of fault dioxide, and even better than the effect of Hao dioxide! ”

"Huh? Is this really possible? Lin Yuanfang looked at Jiang Yaowu in surprise, "I can't believe it."

"Absolutely. I have tried many times, and the zircon powder processed by this method can completely exceed the whitening effect of Hao dioxide. Jiang Yaowu replied with great certainty.

"Where...... What's the truth in this? Lin Yuanfang frowned and asked, "He couldn't understand why zircon powder, which was originally black and gray with a whitening effect, could undergo earth-shaking changes after being soaked in hydrochloric acid or sulfuric acid, and became something that was completely comparable to the whitening effect of the wrong dioxide, or even surpassed the effect of the wrong dioxide."

"I have thought about it, there can only be one explanation, that is, in the process of processing zircon powder with machinery, there are some trace amounts of iron filings mixed into zircon powder, Jiang Yaowu said: "The Haoying stone is crushed into quat sand with a mechanical crusher", the Haoxin sand is crushed into pinning coarse powder, and then processed into lock powder with a fineness of more than 30,000 meshes by Lei Méng mill and jet mill, and finally separated from impurities such as monazite and rutile by centrifuge. It is because of the iron filings contained in zircon powder that "will cause the ceramic embryo body to appear black and gray after high-temperature calcination." ”

"Since it's because of the trace amount of iron filings mixed in zircon powder, haven't other experts found it? Didn't they take into account that it was for this reason that the whitening effect of zircon powder was greatly reduced? Lin Yuanfang rubbed the sun, he drank too much wine today, and his mind was already a little dizzy, at this time, listening to Jiang Yaowu talk so much, he felt that the sides of his head were a little swollen, and he wanted to try to sober himself up at this time.

"Boss, for this problem, many experts really don't think of it." Jiang Yaowu said respectfully, "Because for the sè material or grapefruit material processed by the grinder and the Lei Méng mill, according to the convention, it will go through a process of removing iron. In other words, if these raw materials are passed through a high-magnetic stick up to 8,000 gauss, "the iron filings contained in the material will be adsorbed by the high-magnetic stick." Therefore, many experts do not consider whether zircon powder still contains iron filings. Even if some experts consider whether it is because of the residual iron filings in the wrong English powder, the whitening effect is black and gray, "and the processed zircon powder is sent to the laboratory for analysis, but because the number of iron filings remaining in the wrong English powder is very small, it cannot be detected with conventional laboratory instruments, so they ignore this problem.

In fact, "no matter how strong the magnetic force of the highly magnetic material is", it is impossible to completely remove the iron filings in the zircon powder. As long as there are residual iron filings in the zircon powder, no matter how tiny, after high-temperature calcination, it will change, resulting in the deviation of the ceramic embryo body. In order to get rid of the iron filings inside, it is necessary to take the method of chemical reaction, through the chemical reaction of sulfuric acid or hydrochloric acid and the iron filings remaining in the middle of the zircon powder, in order to completely and completely remove the extremely small amount of iron filings remaining in the middle of the zircon powder, so that the whitening effect of the obtained zircon powder can be completely comparable to that of dioxide. ”

"Since conventional testing instruments can't detect trace amounts of iron and blood contained in it, how did you think about this problem?" Lin Yuanfang pondered for a moment and raised the question in his heart, "Seeing that Jiang Yaowu was about to answer, he waved his hand again, pointed to Jiang Yaowu's teacup, and said with a smile: "Don't worry, don't worry, take a sip of tea, moisten your throat, and speak slowly." ”

Jiang Yaowu talked so much, and he also felt some smoke in his throat, so he picked up the teacup and drank a few big drinks in a row. "The teacup was half empty. Lin Yuanfang smiled and lifted the boiling water bottle, "Help Jiang Yaowu fill up the water again", then leaned on the sofa, waiting for Jiang Yaowu's next words.

"Ah......,... Thank you, boss...... Thank you...... You should be able to refill water for you. Jiang Yaowu reacted this time, looked at Lin Yuanfang with a look of shame and said.

Lin Yuanfang also heard clearly this time, Jiang Yaowu called him "boss", so he shook his head and said, "Lao Jiang, this title can't be called indiscriminately!" ”

"Boss, I didn't scream, I know it." Jiang Yaowu said respectfully: "I came here this time to hand over this production formula to you, and I just recognized you as my boss with all my heart." ”

Lin Yuanfang didn't want to continue to entangle with Jiang Yaowu on this issue, so he waved his hand and said, "Let's not talk about this for now" You go on, how did you find out that there are trace amounts of iron filings left in zircon powder? "For Lin Yuanfang, it is indeed very strange to this question. Even if Jiang Yaowu majored in ceramic chemical engineering, he had worked in the leadership position of Huayi Aluminum Plant for so many years, even if he did not throw away all his professional knowledge, "but the professional level will not be high." This is not only Jiang Yaowu, there are too many examples in China in this regard, "there are many experts and scholars, once they become leaders", there will be no achievements in the professional aspect. Even Lin Yuanfang has not engaged in his own planning and design major for more than two years, "I feel that I can't grasp the latest and most cutting-edge design trends." Then the problem comes out, so the top experts and scholars in the field of ceramics have not found the problem, how did Jiang Yaowu find it?

Jiang Yaowu seemed to know what Lin Yuanfang was thinking, so he smiled a little ashamedly and said, "Although I am a silicate major, most of my professional knowledge has been returned to the teacher earlier. So as far as I am concerned, "I definitely did not take into account the whitening effect of zircon powder, which is black and grayish because there is a trace amount of iron residue in it." To be able to discover the secret in this is completely coincidental Zirconia powder @.