The earth is blazing, and the molten iron of the smelting furnace is tumbling.

However, after pouring three furnaces of molten iron in a row, the purity of the black iron is only 95%, which may be slightly higher, according to the estimation of the strength of the identified light, it may reach more than 95.5%, but it is definitely not 96%.

It sounds good to go one step further, but it's even more difficult to go any further! It's all over, how can we go further!

Zhang Shengye frowned slightly: "Let all the craftsmen in the family forge and purify, and you will definitely be able to get 10 tons of Xuaniron in three days." ”

Zhang Hao shook his head: "Second uncle, I think that what the princess wants is not only ten tons of dark iron, but also what she wants to see is our ability."

If we can't even produce 96% of the black iron, how can we convince the princess that we can build a big ship, a big ship that can cross the green sea of death!"

Zhang Shengye nodded thoughtfully.

Next to him, Huang Mingshan said cautiously: "Young Master, if you replace the earth fire with spirit stones and formations, and replace the inferior broken spirit stones with low-grade spirit stones, I don't know if you can improve the purity?"

In my opinion, a considerable part of the impurities in the dark iron come from inferior broken spirit stones!"

Zhang Hao's eyes lit up suddenly, "Why did I forget this." ”

In fact, Zhang Hao didn't forget, but deliberately didn't say it. He wanted to train Huang Mingshan and others, and let them form a sense of active thinking, summarizing, learning, accumulating, and making progress.

In the process of operation just now, Zhang Hao mentioned the scene of the open water forging technique in Fang City many times.

The transformation soon began, and Huang Mingshan and others immediately began to calculate the approximate data.

"The purity of the broken spirit stones varies, and the average spiritual energy content is about 18% of the low-grade spirit stones. And impurities interfere, and the effective aura of the broken spirit stone is only about 15% of that of the low-grade spirit stone. ”

"Crush the spirit stone to increase the effective contact area with the ore. ”

"The selected ore is crushed and then re-watered to increase the purity of the iron ore. ”

"Bamboo charcoal is used instead of charcoal to further reduce the impurity content. ”

"Although the air volume of a fan is sufficient, it is not uniform. It is recommended to use four fans to operate at the same time, and the air volume is controlled at about one-quarter. ”

"Use low-level spirit stones to arrange the flame formation. The flame formation is calculated according to the formula on the Sutra, and the temperature is controlled above 2700 degrees. ”

"By the way, the air supply of the fan must first be preheated by the flame formation, and then passed into the molten iron to prevent the molten iron from cooling down. ”

"There's a lot of dust here, and the smelting process is isolated by a formation, and the air from the fan needs to be filtered. Cotton is used as a filter layer for the time being. ”

Huang Mingshan, Bai Xiaodong and others were busy, and Zhang Hao watched from the side and smiled faintly.

Now, the Zhang family has initially gotten rid of the traditional handicraft model. In the production process, we began to pay attention to measurement, calculation, and mathematical methods to summarize everything.

Although the measurement technology is not perfect and the data is not accurate enough, the technology is finally budding and thriving.

What makes Zhang Hao happiest is that everyone's way of working is no longer through the accumulation of experience, but directly from the theory.

Air preheating, filtration, uniform air supply, crushing of ore and spirit stones, attention to controlling impurities from raw materials, etc., all these have the consciousness of scientific production.

This is a qualitative leap.

Busy until the second half of the night, a "refining workshop" appeared.

It is a ten-meter-square house, surrounded by four wind turbines, in which the ore powder and low-grade spirit stone powder are heated by water separation, dried ore powder, and carefully selected bamboo charcoal powder.

Below, the flames triggered by the spirit stone were purple-gold, and in this small space, the rolling heat wave made Zhang Shengye a little uncomfortable. Zhang Hao and others in the Qi refining period were sweating like rain.

But, no one complained!

With an unprecedented spirit, everyone devoted themselves to this unprecedented research and production.

Billowing brown smoke gushes out from above the furnace and is then pumped away by the fan and discharged to the outside world.

Above the Zhangjia smelting base, more than a dozen brown pillars of smoke rolled into the air. In the early stage of industrial development, the ability to pollute the environment is directly proportional to industrial production capacity and technological progress!

The world is so big, I want to ...... Pollute it~~~

Time crept into the dawn, and the first furnace of brand-new molten iron finally stopped producing smoke. But instead of pouring it immediately, the craftsmen continued to heat it and wait.

Because, the next step is one more step - precipitation!

The air volume began to slow down and gradually almost disappeared.

A spirit gathering array is placed at the air inlet of the fan, and a small amount of spiritual energy is slowly injected into the molten iron through the fan.

About an hour or more, that is, more than two hours, when the sun rose, Huang Mingshan ordered the iron ingots to be poured.

Now, Zhangjia's smelting furnace is very large, and one furnace of molten iron can pour more than three tons of iron ingots.

It's still half a meter square.

Zhang Shengye couldn't wait for the iron ingot to cool down automatically, he took a little bit from the molten iron and used a spell to cool it down and identify it. After a while, Zhang Shengye's mouth opened:

"Purity: 97%~~~"

The voice was trembling, it was a success, a huge success!

Zhang Hao was very calm, and turned his head to start rewarding. This time the reward was very rich, but there were only fifty people, and there were craftsmen, but Zhang Hao rewarded 100,000 spirit stones in one go! An average of two thousand per person.

Two thousand spirit stones, equivalent to two million iron coins!

Although the value of iron coins is a bit depreciated now, it is the kind of low-purity black iron coins that have depreciated.

Here in the Zhang family, craftsmen can exchange a spirit stone for 3,000 low-purity Xuantie coins.

That's how capricious!

Our old Zhang family has no shortage of dark iron.

Because it is difficult to smelt Xuaniron, which is not only a cultivation resource, but also has its own monetary attributes, the state encourages private coinage.

With the disclosure of the water forging technique by the Zhang family, the Xuantie market began to be unstable, and the low-end monetary system dominated by Xuantie coins was also seriously impacted.

But the princess didn't say anything about it last time, so Zhang Hao naturally wouldn't be bored.

The real greatness of resourcefulness is that when someone asks, you say it, so that they can let people know, oh, you're smart. Or, as a bargaining chip.

Moreover, the depreciation of the Xuantie coin is of great benefit to the Zhang family. Now, the Zhang family is frantically minting coins, buying grain, broken spirit stones, wood charcoal, cloth, horses, etc., and even fields, mines, etc.

Earlier, the princess said that she would exchange raw materials such as broken spirit stones for the Zhang family's dark iron, why did Zhang Hao refuse? Not only because the princess insisted on the 'market price', but also because the Zhang family itself could mint coins, and the average was only half of the market price!

The biggest cost of Xuantie smelting comes from the 'Broken Spirit Stone'. Although the broken spirit stone is an inferior spirit stone, it is also a spirit stone. It is used to arrange formations, cultivate elixirs, smelt, etc., and they are all very marketable.

Now, the Zhang family buys broken spirit stones through their own coinage methods, and in one go, the cost of broken spirit stones of the Zhang family is reduced by about half.

And the Zhang family buys a lot of money, and it can further reduce the price.

In the early days of capital expansion, it was barbaric and brutal. The Zhang family is also inevitable.

............

By noon, the three ingots had finally cooled, and the craftsmen had already begun smelting the second ingot.

The purity of the first furnace was 97%, and the second furnace was started with a reasonable reduction of requirements, and finally controlled at 96%.

Zhang Hao leaned against the door, but there was a smile on his tired face.

Science and technology have finally blossomed;

The door of industry is slowly opening.