If you want to fire glass, there are several problems that need to be solved.

One is the container, one is the raw material, and the other is the high temperature.

The containers and raw materials are easy to handle, the main thing is the high temperature.

The melting point of silica sand, or quartz, is between 1,200 and 1,600 degrees.

And Datang, there is no fuel that can reach such a high temperature now.

Even if it is charcoal, the maximum temperature of combustion is only more than 900 degrees.

In other words, if you want to burn the glass, Zhang Zheng has to coke first.

Therefore, Zhang Zheng regretted it the moment he went out.

Isn't it good to lie down well, why bother yourself?

Coking, how troublesome it is to coke by the soil method.

Zhang Zheng's mouth moved, and he shouted at Li Taina: "Qingque, it's going to be Yuanzheng in a few days, otherwise we will burn it again after the festival?" ”

"Teacher, can't you burn it?"

Li Taiyuan's face was full of doubt.

"Huh? Are you questioning me, just glass, can you just have hands? ”

Zhang Zheng suddenly felt that his authority was being questioned, and when he raised his hand, he knocked on Li Tai's head.

"Teacher, what are you doing?"

Li Tai rubbed the big bag on his forehead that was knocked out by Zhang Zheng, and asked pitifully.

Zhang Zheng knocked like this, and his mood was inexplicably refreshed, but he reprimanded with a straight face: "You dare to use the radical method on the teacher, put away your little wisdom, you can use it for a while, you can't use it for a lifetime, only great wisdom ......"

Zhang Zheng said a lot, and when he saw that Li Tai was about to be ashamed of what he said, he almost found a crack to drill into, and then he stopped his mouth unsatisfied.

Still, Li Tai's agitation method is still very useful.

At least although Zhang Zheng doesn't say it now, he is full of energy in his heart, and he really wants to burn this glass out for him to see.

Coking, especially soil coking, is a very troublesome thing that has little technical content.

Because it takes a particularly long time, it takes at least eight or nine days to refine a furnace of coke, and the coking rate is pitifully poor.

So, so Zhang Zheng decided to hand over this matter to Li Tai.

The structure of the earth-based coke oven is very simple, it is a kiln made of bricks.

Draw the drawings and throw them to Li Tai, he only needs to find a craftsman to build them.

There is also the medium, the quality does not have to be good, but the quantity must be more.

Because of the soil coking, the efficiency is really low.

Li Tai was very interested in this, and with a pat on his chest, he took over these two important tasks.

So Zhang Zheng didn't care about him anymore and let him toss.

To put it bluntly, coking is a simple purification process, except that it will take a long time, and there is no difficulty.

On the third day, Zhang Zheng was half-asleep and half-awake when he was dragged up from the bed by Li Tai.

Then he followed Li Tai to the wasteland on the other side of the river in a daze.

Li Tai puffed out his chest and proudly pointed to the three kilns rising from the wasteland and said, "Teacher, this thing is right, how to operate it next?" ”

"Add coal, light it, and keep it for ten days and eight days."

Zhang Zheng yawned, rubbed his sleepy eyes, and answered concisely and clearly.

High temperature purification, removal of impurities Li Tai naturally knows, just pull Zhang Zheng to confirm, and by the way, show his results in the past three days.

Now that Zhang Zheng was sure, Li Tai waved his hand, and the craftsmen who had been instructed began to methodically load the medium blocks piled up like a hill into the kiln.

This kind of thing is called charcoal in the Tang Dynasty.

But now there is no market for this kind of thing in Datang, because the charcoal burns with a pungent taste, not to mention, it is easy to suffocate people.

Charcoal burning is poisonous, this is already the consensus of the Tang people.

Looking at the coal all over the ground, Zhang Zheng suddenly felt that he was sorry for God if he didn't get rich.

Who is the richest person in the future, of course, is the coal boss.

Zhang Zhengmo rubbed his chin and looked at the coal on the ground thoughtfully.

Coking is a very troublesome thing, and the gains outweigh the losses.

But if you make the coal into a honeycomb shape, build a stove, and do a bundle operation.

"Oops, Meidi is very~"

Zhang Zheng suddenly stroked his hand and sighed.

The coking process is boring and takes a long time, so neither Zhang Zheng nor Li Tai plans to stay here.

Back in Xiaotang, Zhang Zheng began to think about how to use coal to make a fortune.

Li Tai went to find someone to grind quartz stone

The sand went.

Because Zhang Zheng told him that the finer the raw materials are grinded, the more transparent the glass will be.

Of course, this is Zhang Zheng's nonsense, the glass is opaque, mainly depending on the amount of impurities, the less impurities, the more transparent, but who called Li Tai doesn't understand.

A sense of superiority that comprehensively crushed the Tang people in terms of IQ rose from Zhang Zheng's heart. Oops, Meidi very.

Stoves, honeycomb coal, and even less technical content.

Write down the drawings of the furnace and the method of making honeycomb coal, and then send them to the county office.

There is no shortage of skilled craftsmen in the county uncle's mansion, so someone sent the finished product to Zhang Zheng on the third day.

"Go back and tell Liu Er, while it's winter, produce a batch on a large scale and sell it as soon as possible, there is nothing difficult about this thing, someone will imitate it soon, the county uncle will only make the first pot of gold, don't go to fight a price war with them."

"Yes."

Zhang Zheng looked at it for a while, and then asked someone to move the round-bellied stove into the filial piety hall and erect a big chimney.

With this thing, the fire pit in the filial piety hall is useless.

……

At night, Li Tai, who had been grinding quartz for three days with someone, opened his mouth wide, and his mouth was burned with a hissing ~ha~ sound.

Zhang Zheng sat across the stove and slowly put a piece of mutton into the soup pot in front of him and scalded it for a few seconds.

Then he quickly withdrew his chopsticks and dipped them in the water in front of him with leek flower sauce and garlic paste.

Put the tender lamb in your mouth and chew it with a blank face.

After swallowing it in one gulp, he sighed leisurely: "A hot pot without chili peppers has no soul after all." ”

"Yes, I'm very happy."

Li Tai was sweating profusely, and he didn't forget to take the time to respond to Zhang Zheng.

Then the two of them began to play the chopsticks left and right as if they were competing.

"Hiccup~"

The two of them hiccuped at the same time, and Li Tai picked his teeth and asked lazily, "Sir, does coking have to be refined for ten days?" ”

"It's almost the same, you can try it yourself a few more times."

Zhang Zheng also has the same actions as Li Tai, and even the appearance of picking his teeth is not bad at all.

"Now there is only one month left before Yuan Zhengke, can we burn the glass?"

Li Tai's round face was a little worried, and he also wanted to personally burn a piece of glass to give to his father as a congratulatory gift on the day of Yuanzheng.

"No problem, trust me. What you need to be careful now is not to let the char turn to dust. ”

Coking this thing, once the time is not well controlled, it is easy to burn the coke into fly ash, so Zhang Zheng had to give a special advice.

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