Three hundred? What's the use of all that? It's not a large-scale zinc-smelting plant, if it's a large-scale zinc smelting, these 300 are about the same.

"This time, let's do five first, and show the samples to others. In the future, not to mention 300, even 3,000 is possible! I'll pay for the mold separately.

Also, I can make this clay pot myself, as long as I borrow the old brother tile kiln to burn it, whether it is red or green, as long as it can be used.

I'll pay another 200 yuan and ask a few old brothers to help. At noon, I invited a few old men to drink. But I'm going to have to trouble some guy to buy two chickens for me. Then he put the jar on the ground.

These 200 wen are half a month's salary for a worker, which is not a small amount. Under Wu Yanzhi's repeated temptations, the expressions of the three of them became very pleasant.

The leading man just now nodded: "A few clay pots, but you don't need Lang Jun to make it yourself, I will finish it in an instant." But now it's raining, and you can only do it when the rain stops. And you have to wait for the weather to dry before you can enter the kiln to fire, and it will take almost half a month before you can get these jars. ”

"Don't worry, I'll trouble a few brothers. Who is going to buy two chickens for me? He pulled out one hundred and fifty papers.

"Gao Yuanshan, you go to my house to catch two, it's rare for this Langjun to be so generous! Drink a few bowls of wine today. The leading man said.

……

During the meal, Wu Yanzhi learned that the leading man was named Zhang Shancai, nicknamed Zhang Da Hammer, who used to beat stones in Longmen Mountain, south of Luoyang City, and used them as building materials! It was only five or six years ago that the bricks and tiles were fired.

Those people had never seen Wu Yanzhi's strange clay pot, but they asked what this thing was for.

"It's for zinc smelting!"

"Zinc smelting? What is zinc? ”

"This ...... It's a kind of thing that is added to copper and turns copper into a pin, a bit like tin! ”

As soon as I heard that after this thing was added, it could turn copper into a hammer, wouldn't that increase its value dozens of times? Several people immediately put down their wine glasses, their eyes widened!

That Zhang Shancai asked, "What kind of smelting method is it?" Can Takero reveal a thing or two? ”

"It's not that I deliberately conceal it, this smelting zinc is a technical job, otherwise why hasn't anyone smelted it for thousands of years? I also saved a merchant from the Western Regions by accident, and he gave me the secret of smelting zinc!

It took me more than two or three months to learn! So it's not clear for a while! It just so happens that you are tile burners, but you have experience! In the future, if I have the opportunity, I will take you to smelt zinc and smelt! This income ...... The income is at least much stronger than what you are burning bricks and tiles now! ”

Of course, Wu Yanzhi couldn't tell them the secret! This is a magic weapon for promotion by yourself, and no one can reveal it before the time comes!

As soon as they heard Wu Yanzhi's words, the three of them also nodded yes! After all, for thousands of years, where have you heard of such a thing as "zinc"? It must be extremely difficult to refine!

So several people began to toast frequently, hoping that Wu Yanzhi would really be able to provide them with a chance to make a fortune in the future!

Wu Yanyi was drinking while looking at the clay pot drawings placed aside, and he was very excited!

This zinc-smelting clay jar, when he was in graduate school, he also went to the mountain city to see the relics of the ruins hundreds of years ago. This thing is actually a crockpot that is more than a meter high, with a large mouth and a small bottom!

When smelting zinc, the washed zinc concentrate powder is mixed with coal or charcoal powder and poured into the clay jar, but at most there is still a position of 40 centimeters from the mouth. It is then sealed with mud, leaving only a small hole to allow all gases such as gaseous zinc, carbon monoxide, carbon dioxide, and sulfur dioxide to evaporate.

Of course, there should be a groove in the lid to collect the condensed liquid zinc! Further up the mouth of the can, a layer of mud should be sealed, and another hole should be opened in the opposite direction of the lower hole. This creates a cooling chamber.

When the clay cylinder is burned at high temperature, after various gases come out, the zinc gas entering the upper cooling chamber will condense in four or five hundred degrees. But carbon monoxide, carbon dioxide, sulfur dioxide, and all other gases will leak out through the top holes.

Because if you don't let the gas out, it will definitely explode. The equation for chemical reactions has been discussed before, so I will not repeat it here.

This is the whole process of smelting zinc. This zinc has been purified many times and can reach a purity of more than 99.9%! This is because steam purification, the effect is very good, much higher than the purity of metals such as copper, iron, tin, lead, silver, etc., and similar to gold.

……

Afternoon.

Wu Yanzhi went to Beishi and spent 120 wen and bought 200 pages of paper, preparing to write a book. He felt that paper was very precious, and it seemed that the poor people in ancient times really couldn't afford to read! Then I bought some pen and ink.

When he returned to the Taoist temple, he asked people where the alchemy stones of the Nine Heavens Observatory came from. Someone gave him information, but it was collected from a nearby mountain by a few sprinklers given by the royal family.

After asking the names of the sprinkler households, Wu Yanzhi found those households and asked them to come to the Taoist temple every day to clean them, and to bring the calamine and malachite provided to the Jiuxiao Dao Chief, and not to use other stones.

He specially went to the master of the temple to take some ore samples and showed them to a few people, and gave five cents for one hundred catties, and those people came to the Taoist temple every day to clean up, and they could earn five cents, so they were naturally very happy.

On the second day, he then spent another 110 wen to buy a stone mill, a sledgehammer of more than two catties, and a few bamboo mats.

The place where he lived was very quiet, with a separate two-room house, a storehouse on the left and a large bamboo forest on the right. There is a vacant land of more than ten square meters behind the house, with a few plantains and miscellaneous trees, and behind the vacant land is a steep ridge forty or fifty meters high.

Because others knew his identity, and because he was close to the Lord, no one dared to disturb him.

Since then, in addition to writing books every day, he has broken the stones carried by the peasants, and then put them in a stone mill to grind them into powder, and then wash the concentrate powder with clean water.

Generally, the industrial grade of sidestone is only 3~6%, and the industrial grade of copper is 0.4~0.5%. The so-called industrial grade is the grade of the value extracted by industry.

Therefore, it is not very high, and the concentrate powder must be selected to facilitate smelting. Otherwise, fuel and labor will be consumed in vain, and not much will be refined.

Here we also want to introduce the principle of gravity beneficiation.

As you know, ordinary metals are heavier than ordinary rocks. Therefore, the most primitive gravity beneficiation method is to grind the ore and wash it with water, and the concentrate powder containing metal must have the largest specific gravity and will sink to the lowest place.

Of course, modern beneficiation is more precise, and some chemicals will be added for beneficiation according to the different properties of the metal.

The bamboo mat he bought was used to wash the ore powder.

Twelve days passed.

During this time, he made a furnace out of mud to smelt copper. Copper is not so troublesome, it will turn directly into liquid, flowing out of the small holes at the bottom, like iron.

Because the boiling point of copper is extremely high, it is generally not reached, so it does not become gaseous. Of course, it is still reduced by burning charcoal at high temperatures.

That afternoon, Zhang Shancai and others unexpectedly took the initiative to send him three clay pots. Wu Yanzhi was very happy, and gave each person another seven yuan to send them away.

On the 20th, he went to Beishi to buy back 120 catties of anthracite, and when everything was ready, he was ready to start smelting zinc. In fact, any coal can be used, but Wu Yanzhi doesn't want to move too much. Because the general bituminous coal smoke is too large, it can be seen from afar, and the anthracite soot is very small, so to make honeycomb coal, it is anthracite.