What Are the Different Uses of Kaolin?

Kaolin is a non-metallic mineral. It is a clay and clay rock dominated by kaolinite clay minerals. Because it is white and delicate, it is also called dolomite. It is named after Gaoling Village, Jingde Town, Jiangxi Province.

Kaolinite minerals are composed of kaolinite clusters such as kaolinite, geocline, perlite, halloysite, etc. The main mineral component is kaolinite.

The chemical formula of kaolinite is 2SiO ₂ · Al ₂ O ₃ · 2H ₂ O, and its theoretical chemical composition is 46.54% SiO ₂ , 39.5% Al ₂ O ₃ , 13.96% H ₂ O. Kaolinite minerals are 1: 1 layered silicates, and the crystals are mainly composed of silicon-oxygen tetrahedron and sodium hydroxide octahedron. Among them, the silicon-oxygen tetrahedron is connected in a two-dimensional direction to form a hexagonal array. The grid layer, each oxytetrahedron not shared by the apex oxygen is facing to one side; the oxytetrahedron layer and the oxygen octahedral layer shared oxytetrahedral layer of the spire oxygen form a 1: 1 unit layer ^{[1 ]}

Traits: more matte, pure white and delicate when pure, such as gray, yellow, brown and other colors when containing impurities. Depending on the cause of the appearance, it can be in the form of loose soil and compact.

Kaolin is a common and very important clay mineral in nature. It is formed by weathering of feldspar or other silicate minerals in igneous and metamorphic rocks in an acidic medium lacking alkali metals and alkaline earth metals.

As for the current processing methods of kaolin, there are two methods of mechanical crushing and air jet crushing. The mechanical pulverization is generally pulverized to about 300-1000 mesh, but the pulverization process is mechanical. Therefore, the pulverized fine powder has increased iron content and other impurities, which is defective for industries with higher requirements for application purity. The collision and shearing of materials and materials are adopted without the participation of pulverizing medium, so the purity of the materials is effectively guaranteed, thereby meeting the application efficiency of industries with higher purity requirements, and the pulverization fineness of the jet mill can reach 5000 mesh (fine Degree range adjustable from 1000 mesh to 5000 mesh) ^[2]

(1) In order to separate non-clay minerals and organic matter such as quartz, feldspar, mica, iron minerals, and titanium minerals in kaolin, and produce kaolin products that can meet the needs of various industrial fields, in addition to gravity, flotation, and magnetic separation In addition to purification of kaolin, kaolin is sometimes treated by deep processing methods such as chemical bleaching, ultra-fine stripping, calcination, and surface modification. Kaolin mineral processing is divided into two processes, dry and wet. </ p> <p> (1) The dry method generally crushes the mined raw ore to about 25mm through a crusher and feeds it into a cage crusher to reduce the particle size to about 6mm. The crushed ore is further ground by a blown Raymond mill equipped with a centrifugal separator and a cyclone duster. The process can remove most of the sand and gravel, and is suitable for processing those ores with high whiteness, low sand and gravel content and suitable particle size distribution. Dry processing has low production costs, and products are often used as low-cost fillers in the rubber, plastic, and paper industries.

(2) The wet processing process generally crushes the raw ore, and then passes through pulping, sand removal, cyclone classification, stripping, centrifuge classification, magnetic separation (or bleaching), concentration, filter filtration, and drying. The product can be used in ceramic or paper coatings. If filler grade or paper coating grade kaolin is prepared, the calcination process needs to be added, that is, raw ore crushing, pulping, cyclone classification, peeling, centrifugal classification, concentration, filter press, internal steam drying, calcination, depolymerization, etc. ^[4]

The porcelain clay used for porcelain is called "kaolin" in the world. This kaolin is produced in Gaoling Village, Jingde Town, Jiangxi Province!

It was a long, long time ago, there was a poor couple named Sheng who lived in Gaoling Village. They took a few acres of thin fields that the earth advocated for peeling. It was all year round and the wind came and the rain went. It was hard to lay a little grain of food. As soon as Yan Wang's account was turned over, the abacus beads would be scraped. They rely on sweet potatoes, radishes and wild vegetables for their meals, and their lives are as bitter as Huanglian.

Although the Sheng couple lived a hard life, they were very kind in heart. When they heard that they could not open the pot, they would rather go hungry by themselves and save some food for delivery. Therefore, people in the village called them "well-meaning prosperous families".

One year in winter, the weather was extremely cold and the north wind came over like a knife. Early in the morning, with strong winds and snowflakes, the Sheng man was holding a bundle of firewood, and was going to go to the home of a lonely old lady in Qiancun. When she opened the door, she saw a pale-haired husband lying under the eaves. The husband's clothes were shabby, his face was yellowish, and he was shaking with frost, and his mouth continued to make painful calls.

When the Sheng man saw him, he quickly put down Chai He and stepped forward to help her husband into the house. He took off his torn cotton jacket and put it on her husband, while he was busy calling his wife to pour a bowl of hot water.

The Sheng man asked, "Husband, which village are you from? What do you do when you go out on a cold day?"

The husband sighed deeply and replied: "My family lives far away because I was forced by the landlord's wealth and had no choice but to go out to vote for relatives. I didn't expect to fall ill here." The man listened and said comfortably: "Husband, you are in a hurry. You are ill. You will be sick in my house now. Wait until it's spring and go!"

The husband nodded moved. At this time, Sheng's wife brought a bowl of hot water and brought it to the husband, asking him to drink warm body. The husband shook his head and said, "I am too hungry to eat. I want to drink a bowl of hot porridge. I wonder if I have any?"

The couple listened and felt very embarrassed because their rice bowl was long empty. Sheng's wife wanted to tell her husband straight, but her man couldn't bear seeing her husband's hunger and pain, so he pulled his wife into the kitchen and said quietly, "You go to Zhang Pei's home and borrow a liter of rice Come, boil the porridge and drink for her husband. "When his wife asked her to go to Zhang Pei's house to borrow rice, she was taken aback! Speaking of this peeling, Gaoling Village is dozens of miles away. Who knows that he is a blood-sucking cockroach, the biting is deeper and deeper, and it is not lethargic if he does not suck blood. No one dares to go to his house to borrow.

Seeing his wife hesitant, the Sheng man pushed her again and asked her to go.

The wife borrowed rice, and the man made a fire to make porridge. After a while, a large bowl of fragrant, hot rice porridge was brought to her husband. After seeing her husband, he was also welcome, and drank the porridge in one breath.

Strange to say, as soon as my husband drank this bowl of porridge, his yellowish face turned ruddy, his spirit was better, and his illness seemed to disappear. At this time, the husband stood up and returned the ragged cotton jacket to the Sheng man, saying, "You are really well-deserved: well-meaning Sheng family. I have nothing to repay you. After I leave, you can go to Songshan, southeast of the village Digging it at the top and digging it out at 981, at that time, there was a way to pay back one liter of peeled rice. "The husband said, and walked away.

The Sheng family and husband heard this, and they felt very strange. They thought: How could the husband know that they had borrowed rice from Zhang Peeling when they were lying in the house? Could he be immortal? When the couple left the house and looked, the husband had disappeared.

Back in the house, the husband and wife of the Sheng family really picked up their hoe and went to the top of Songshan Mountain, southeast of the village, struggling to dig up. For a while, for two ... 30, forty ... When the digging of the nine hundred and eighty-one, a miracle appeared: the dark and muddy soil turned into white flowers, and the victorious man held it up with his hands. , Pinch, ha, soft as glutinous rice noodles, smelling the tip of the nose, it is fragrant, pinch a bit into the mouth to taste, it is sweet and sweet, just like real glutinous rice noodles Exactly the same.

This time Cola broke the Sheng couple. They thought that the poor people in the village were suffering from hunger, they hurried back to the village, called the poor people, picked up the big baskets and small barrels and bustling to the top of Songshan, everyone started, yuck, dig, Pretend, pick, dig a layer, and immediately grow another layer ... At this time, the joy of the poor people need not be said!

The poor people cheerfully picked the "glutinous rice noodles" home, sometimes making dumplings, sometimes making ravioli, really like Chinese New Year.

Zhang Peel knew this. He hurriedly climbed to the top of Songshan to see, his eyes became red and his mouth narrowed. He called a group of dog-legged family members, surrounded the top of Songshan, drove the poor down the mountain, and nailed the wooden sign of "Zhangfu" around him, saying that Songshan was the treasured mountain of his family. When you come to Songshan to dig out glutinous rice flour, you have to send it to the official.

Besides, Zhang Peel asked someone to dig a large basket, took it home to make dumplings, and the dumplings were ready. Zhang Peel called the whole family to the hall, twisting his beards, and proudly said, "Today I treat you as much as possible. After we finish eating, we can go up the hill to dig. Haha! I can make a fortune now, "said Zhang, stripping his belt and eating.

Zhang peeled and swallowed a dumpling with a sip. As soon as dumpling fell, he held his belly with both hands, damn it! Mom fell to the ground and rolled up. Before the family walked, there was some dumplings. The dumplings in the bowl were all turned into stones. There was a stone in Zhang Peel's belly. He was sore in pain that it kept going until dawn, and he died alive.

When Zhang Peel died, the men, women, and children in Gaoling Village were happy. The husband and wife of the Sheng family led the poor people to the top of the Songshan Mountain. When they reached the top of the mountain, they found that all the "glutinous rice flour" they had dug out had turned into stones. At this time, everyone hated Zhang Peeling even more.

That night, the husband and wife in the Sheng family saw their husband come to him again and said, "The stones on the top of Songshan can be used as porcelain, and the porcelain made can be as valuable as jade!" The next day In the early morning, the Shengjia couple and the poor in the village came to the top of Songshan Mountain, and they saw that the mountain was full of glittering earth and stones. According to the order of the husband, the Shengjia couple made the excavated earth and stones into bowls and cups. The blanks came and burned in the kiln, and all of them were crystal white, really like jade.

The poor people in Gaoling Village picked up these jade-like porcelain bowls and porcelain cups and sold them to the town. The people watched them and they were so fond of them that they were snapped up after a while.

Since then, the poor people in Gaoling Village, under the leadership of the Shengjia couple, switched to digging earth and building kiln to burn porcelain. Because Songshan is located in Kaolin, it was renamed Kaolin Mountain, and the porcelain on the mountain is called Kaolin.