Suzhou soil, is produced in the Suzhou area of Sujiang Province, China Yangshan kaolin, belongs to the low temperature hydrothermal alteration residual kaolin, the main minerals are tubular hydrohydrous kaolinite and flake kaolinite, is a natural high-quality raw material for the manufacture of special ceramics, but also a high-quality bonding agent for refractories.

Hao Shuang did not expect that Tianyang Special Pottery Factory, as a manufacturer of special ceramics, did not have the reserves of Suzhou soil.

"Expert Hao, what is the main role of Suzhou soil in your experimental formula, and can it be replaced with other raw materials?" asked Yang Guanghui.

Since Hao Shuang dared to write a picking list for Yang Guanghui to pick up the materials, he was naturally not afraid that Yang Guanghui would leak his production formula through the raw materials on this picking list.

"The function is very simple, mainly for bonding and promoting burning. Hao Shuang replied.

Use Suzhou soil as a binder and burner?

Is that okay too?

Yang Guanghui couldn't help but be dumbfounded.

In order to maintain the working strength in the high-temperature environment, the alumina content of the raw materials in the porcelain support shaft device currently trial-produced by the special pottery factory is more than 99%.

However, because alumina is a barren raw material, the adhesion is not enough, and it is more difficult to form, and the higher the content of alumina, the higher the firing temperature of the porcelain support shaft device.

Therefore, in order to improve the forming rate of the porcelain support shaft device and reduce the firing temperature of the porcelain support shaft device, the scientific and technological research project team of the special pottery factory also tried to add kaolin to the raw material formula of the porcelain support shaft device at the beginning, so as to facilitate the forming of the green body and reduce the firing temperature of the support body.

This method is also effective, and the porcelain support shaft device with kaolin mineral components not only has a high molding rate, but also reduces the firing temperature to less than 1,700 degrees, which greatly reduces the firing difficulty and resolves the manufacturing cost.

However, it is also the existence of clay substances such as kaolin in the porcelain support shaft device, which also leads to the use of the fired porcelain support shaft device in the alkaline environment test, the mechanical strength is greatly reduced with the extension of the use time, which affects the stability of the porcelain support shaft device, and finally the clay substances such as kaolin are eliminated from the raw material formula by the scientific and technological research project team of the special pottery factory, and the organic matter such as starch, glycerin, diatomaceous earth is used as a binder, and titanium oxide, Valence oxides such as chromium oxide and ferric oxide are used as burner promoters.

"Expert Hao, if it is used as a binder and a burning promoter, I don't think you need to continue this experiment. Yang Guanghui hesitated for a long time, and finally decided to tell the truth, "Because according to the experiment of our factory's scientific and technological research project team, kaolin is used as a firing promoter and binder, and the porcelain support shaft device produced is not up to standard in the alkaline working environment, and it is less than one-tenth of the service time of the porcelain support shaft device imported from Finland." ”

"Hehe, I naturally noticed this!" Hao Shuang laughed, "That's why your research project team took a detour." The correct way should be to take measures to prolong the service life of the porcelain support shaft device using kaolin as a binder and firing promoter in an alkaline environment, rather than directly excluding kaolin from the raw material list of the porcelain support shaft device. ”

So that's the case?

Yang Guanghui suddenly realized.

"But Expert Hao, what should we do if we don't have Suzhou soil in our factory at present? Can we replace it with other kinds of kaolin?" he asked.

"How many kinds of kaolin do you have in your factory?" asked Hao Shuang.

"There are five different manufacturers of kaolin. Yang Guanghui replied.

"Do you have any test sheets for these five kinds of kaolin?" Hao Shuang asked.

"Both!"

"Then go and bring them all to me!"

"Okay, wait a minute!"

It didn't take much work, Yang Guanghui ran back with five kaolin test sheets and handed them to Hao Shuang.

Hao Shuang took it in his hand and looked at it carefully, and then was surprised to find that among the five kinds of kaolin, it actually contained the kaolin produced by the Yangpo clay mine. Originally, he still regretted a little, this time he only brought samples of clay mines to Tianyang, and did not bring out the kaolin samples from his father's mine, but he did not expect that it would take no effort to step on the iron shoes and find nowhere to find them.

The so-called fertilizer water does not flow into the fields of outsiders, since there is such a great opportunity, Hao Shuang must choose the kaolin of the clay mine on the sunny slope.

As for the difference in composition between the kaolin and Suzhou soil of the Xiangyangpo clay mine, it is not a problem for Hao Shuang, as long as a few additional raw materials are added or removed, it can be completely solved.

"Just choose this kind of kaolin!" Hao Shuang put a check mark on the kaolin analysis sheet of Xiangyangpo clay mine, and then picked up the pen and made several changes on the raw material list, changing the diameter requirement of alpha special alumina powder from 20 microns to 30 microns, and adding several mineral powders such as mullite, magnesium oxide and potassium feldspar, and handed them back to Yang Guanghui, so that he could collect the raw materials according to the revised raw material list.

Soon Yang Guanghui gave the raw materials to Hao Shuang according to Hao Shuang's request.

Hao Shuang first measured a piece of alumina powder with a balance scale and handed it to Yang Guanghui, "Secretary Yang, go do me a favor and put these alumina powders in an electric incubator to dry at a temperature of 150 degrees Celsius for 30 minutes!"

Because there is van der Waals gravity, electrostatic force between particles, capillary force due to water adsorption and mechanical entanglement force caused by uneven surface between the particles between special alumina powder particles, these forces often cause a certain degree of agglomeration particles in alumina powder, and finally the density distribution of alumina powder is uneven after pressing.

Therefore, before the alumina powder is pressed, an electric incubator should be operated to pretreat the alumina powder.

As the secretary of the scientific and technological research project team, Yang Guanghui naturally knew what the purpose of this was doing, so he did not suspect that Hao Shuang had other purposes, and immediately took the alumina powder to the electric incubator for constant temperature drying.

Of course, Hao Shuang did this purely because of the needs of the work process, not to support Yang Guanghui and prevent Yang Guanghui from seeing the detailed ingredient list operation on his side!

Half an hour later, Yang Guanghui took back the processed alumina powder, and Hao Shuang had already completed the other raw material proportions. Then the processed alumina powder and the raw materials that he has matched here are poured into the ball mill for ball milling, so as to achieve the purpose of uniform mixing of various raw materials.

After the ball grinding is uniform, according to the normal process, Hao Shuang also needs to add organic additives such as binders and lubricants to the raw materials, put them into the mud training machine for mud training, and obtain plastic mud, and then extrude the green of the porcelain support shaft device through the vacuum extruder according to the shape of the porcelain support shaft device.

It's just that you really have to follow this process, and it takes at least ten hours before and after to get a qualified green billet. And with the biggest interference factor of pig stock Jifu, how can Hao Shuang calmly go to production step by step?

Anyway, it is just to verify the mechanical strength of the green body in a high temperature and high alkali environment, so Hao Shuang directly omitted the next few steps, and after the ball mill is mixed evenly, the evenly mixed powder raw materials are directly put into the hot press and pressed into a sheet body.

As long as the sheet body can withstand the test of high temperature, high alkali and high pressure environment after firing, then the porcelain support shaft device produced by subsequent steps will definitely be able to withstand the same test.

Hao Shuang handed over the pressed eight pieces of flaky blanks to Yang Guanghui and put them into the gas kiln for firing.

"Secretary Yang, the temperature is 1,650 degrees, and the time is two hours!" Hao Shuang commanded.

Two hours were chosen because two hours later, it was almost the point where the first batch of porcelain support shaft units pre-sintered by Pig Stockgiff came out of the furnace and began the second step of operation.

It is the so-called overtaking in a corner.

If the batch of flaky blanks fired by Hao Shuang can pass the experiment, then there is no reason for the next experiment on the pig stock Jifu side to continue!