Chapter 136: Purple Clay Pottery Making Experience Class.jpg
The composition of mineral materials freshly mined from the mine is complex, and it must be manually selected to carefully select suitable purple clay mineral materials.
Most of the freshly selected mineral materials still contain a certain amount of moisture and cannot be crushed and screened immediately. They need to be stacked in the open air to dry and weather for a period of time.
Only after the weathered mineral materials can be crushed with a stone mill for subsequent screening and mud refining——
“Wow——it used to be used when crushing purple sand ore. Is it a stone grinder? I used to think that with the current development, all electric grinders are used. "Here!" Bai Miaomiao, who saw Gong Zhou pushing a small bag of weathered mineral materials into the stone grinding hole, exclaimed softly with her eyes bright and full of unsuppressed interest, "Teacher Gong, you crush the mineral materials." Don’t you think the efficiency of stone grinding is too low? ”
"For this kind of strenuous work... after all, the electric grinder is faster, right?"
"To grind all those weathered mineral materials into pieces one by one with a stone mill, just Just thinking about it makes my arm sore."
"Oh, it is true that the electric grinder crushes faster." Gong Zhou nodded his head when he heard this, "But the electric grinder, the material it produces is not particularly uniform, and the particles are not particularly regular. .”
"The mud grinded by stone mill has uniform particles and better air permeability... Let me think about it and give you an example."
"Comrade Xiaobai, have you ever used that at home? Do you want an electric meat grinder?" Gong Zhounao Head, "When you use that thing, if you don't add a lot of water to it, or if you don't add the right amount of ingredients, it will be easy to beat the stuffing into thin at the bottom and thick at the top...or there will be some left in it. Not minced.”
"But if you use an old-fashioned manual meat grinder or chop with a knife, this problem will basically not occur - the old-fashioned machine can only grind out the thicker parts, and it will cost you to chop with a knife."
"Well...thinking about it this way, that's true Really." Bai Miaomiao clapped her head and pondered for a moment, then nodded in agreement - although she didn't know how to cook, she had indeed heard her mother complain about the newly bought choker when she was at home. The meat machine is not easy to use and is not as smooth as the old machine from before.
——Although it is fast, it can twist just that little bit in one stroke. If there are too many knives, it will not be able to turn.
"But even so, Teacher Gong Zhou, is it too laborious to pull the stone grinder by hand?" The girl in Hanfu frowned and said repeatedly, "Especially in a studio as large as yours... If If all the mineral materials have to be crushed manually, how long will it take for you to grind the stones this year... Can this be done? "< br>
“Haha, if it is purely manual and manual, then of course it cannot be pulled over.” Gong Zhou grinned, his tone was still his usual non-hurried tone, “So now we usually use motors to pull and grind. ——Although we cannot use electric grinders when crushing ore, the grinding grinders can be changed to electric ones! ”
"Eh? That seems to make sense." Xu Yichi, who was watching them playing with the stone mill for a long time, tilted his head and pointed to the small stone mill on the table, "Then this mill is pure Take it out for us to use as a demonstration in class?”
“Yes, Xiao Xu, look at how the decoration of this room is so normal...it can’t be used to crush purple sand ore!” Gong Zhou laughed, "We There is a special place for stacking weathered materials and screening minerals... What can be brought here are only samples for teaching students. "
"Come on, Xiaobai, you can get started. Try pushing the grinding disc twice "
"Okay!" Bai Miaomiao responded simply. In fact, she was already eager to try the stone grinder under Gong Zhou's hand. She just thought that there were not many students in the room. She is more reserved. "Oh, yes, yes, hold the crossbar and push it in a circle - this grinder is larger than the one used to grind tofu or sesame oil at home, so it may be a bit heavy for you." Gong Zhou half-pressed He commanded softly with his voice, adding more new mineral materials into the grinding hole from time to time.
The millstones used for grinding ore were indeed much heavier than the small millstones they had seen in shopping malls or various ancient towns and scenic spots, but Bai Miaomiao, who usually pays great attention to her physical health, would often go to the top of ten millstones. For Hanfu players who wear bushi clothes, the problem is not too big.
Following the instructions given by Gong Zhou, she slowly pushed it two more times and gradually got started. It didn't take much time to grind down all the mineral materials in a small bag, waiting for Gong Zhou to put it in the bag. The bottom of the broken ore she was holding was still there, but she still had a little more to say.
“Okay, the next step after crushing the mineral materials is to sift out the powder that is fine enough, and then beat back the ones with unqualified fineness and grind them again,” Gong Zhoubian said. While stretching his head, he swept out a small pot of powdered ash, "The step of sifting the ash is very simple. It's the same as sifting noodles when you make snacks at home."
"However, the sieves we use when making purple clay pottery are definitely different from the sieves at home...Here, these are three 100-mesh sieves. All three of you will sift them with me. Look."
"Remember not to shake too much when sifting the dust, and be careful if the mud runs away and gets covered in it."
"Okay." The three girls nodded in agreement, and then followed Gong Zhou's example and carefully shook the screen.
The fine enough powder ash falls into the iron plate along the sieve holes, and what remains in the sieve is the slag that has not been crushed thoroughly enough.
The girls who were playing with this thing for the first time were not very skilled in their movements, and it took them enough time to sift a small pot of ash to make a cup of tea.
“Don’t tell me, when this thing is sifted, it really feels like sifting noodles at home.” Xu Dazhuang rubbed his hands excitedly, “Even though the sieve is big, what comes out is not flour.”< br>
“That’s nature, the principle is always the same principle - there’s nothing special about it Others." Gong Zhou smiled and rolled his eyes, "The next step is to add water and mix. This step is similar to kneading noodles, which requires a little experience - after all, we can't add too much dough or add too much water. Face, so I won’t let you get started, please pay attention to the actions of my men.”
"The water we mix into the mud in this step is usually 'rootless water', that is, rainwater - this step should be mixed until the mud is neither soft nor hard, and the mud ball as a whole is not too sticky. Press But it can leave clear fingerprint marks."
"Add rainwater!" An Qing blinked, "Teacher Gong, rainwater is so difficult... Can't we change rainwater to tap water in this step? ?”
“Tap water is not good.” Gong Zhou shook his head, “There will be some residual purification agents used in water purification in tap water. These things may affect the color of the finished mud, or may be on the surface of the pot. Forming salt precipitation. "
"——Rainwater is more suitable. "
I feel that Gong Zhou is better at giving lectures ()
These two chapters are much more comfortable to write than last year’s string-picking