Metal smelting and metal purification already have a certain foundation in this era, and Zhu Cijiong is still afraid that Song Yingxing will not understand what he said, but now it seems that Song Yingxing should understand most of the knowledge.

However, the purification of metals is not only a method of heating reduction, and there are many that need to add acid and alkali additives to reduce it.

Zhu Cijiong thought for a while and continued to ask, "Chang Gung, have you ever heard of some water-like things that can dissolve metallic things?" “

This Song Yingxing really knew, and he said without thinking: "This Weichen has heard that there is a thing called green alum oil, which has no color like water at first, but if you throw copper powder into it, the copper powder will dissolve quickly, and the green alum oil will turn blue-green." “

Faint, this alum oil can't be sulfuric acid!

Zhu Cijiong immediately asked: "Do you know the preparation method of green alum oil?" “

Song Yingxing nodded and said: "The alchemist of the Tang Dynasty, Gu Gangzi, recorded the "Stone Refining Guts Extract Essence Method" in his book "Yellow Emperor Jiuding Shendan Sutra" volume 9, and this Weichen has seen it. “

This Song Yingxing, just reading some miscellaneous books, no wonder he failed to win the imperial examination repeatedly, and in the end he was just a lifter, but this kind of talent is good, and this kind of talent is what he wants.

Zhu Cijiong asked excitedly: "Then have you ever made alum oil?" “

Unexpectedly, Song Yingxing said ashamedly: "Your Majesty, please forgive me, Weichen heard that this green alum oil can not only dissolve gold and iron, but also flesh and blood, so he didn't dare to try it, and he never did it." “

That must be sulfuric acid, Zhu Cijiong nodded and comforted: "Well, there is no big mistake in being careful, if you need to try to make this corrosive water agent in the future, you must wear protective materials such as rubber gloves, so that you will not hurt yourself." And for the convenience of observation, it is best to use a transparent glass bottle or glass tube as a container. “

When Song Yingxing heard this, his eyes lit up, and he nodded frequently, as if he wanted to try it immediately. ”

When Zhu Cijiong saw Song Yingxing's appearance, he knew that the momentum of this product was coming up again, so he simply asked directly: "Chang Geng, have you taken time out in the past few months?" “

Song Yingxing thought for a while and asked cautiously, "I don't know what time the emperor said?" “

Zhu Cijiong smiled: "Naturally, the more the better." “

Song Yingxing thought about it again, and directly gritted his teeth and said: "Your Majesty, please forgive Weichen for his courage, you also know that Weichen's fame, the current position has come to an end, and officialdom is really not suitable for Weichen, it is better for Weichen to step down from this position and concentrate on developing things for the emperor." “

When Zhu Cijiong heard this, he was a little ashamed and said: "Chang Geng, this, although I am the emperor, there are some rules that I still have to talk about, you have made many great contributions to me and the Ming Dynasty, but this position has been staying in place, it is really, alas." “

Song Yingxing hurriedly explained: "Your Majesty, Weichen doesn't mean this, Weichen is actually more interested in technical things in his heart, this is an official, Weichen is really not interested, anyway, there are many cadres in the Ministry of Industry who are qualified for Weichen's position, and the students brought by Weichen are also up, even if Weichen lets go now, there will be no problem, so Weichen wants to leave all mundane things, concentrate on studying technology, and hope that the emperor will be successful." “

When Zhu Cijiong heard this, he frowned and pondered, Song Yingxing's contribution to the Ming Dynasty is simply too huge, and he must not be wronged, this alloy technology must have someone to study and trial-produce, how can he not only concentrate on research, but also get the respect he deserves?

Give him a spare job? This seems a little inappropriate, with the rapid expansion of the Ming Dynasty, people are needed everywhere, officials are needed everywhere, and now the court is up and down, and the yamen of the various ministries are basically extinct, unless it is the kind of wine bag and rice bag, it is really useless to find a real official position, and now give him an idle position, doesn't this chill him!

After thinking about it, Zhu Cijiong finally had a bold idea in his mind, that is, to set up a position of dean for each college in the Ming Dynasty, which was originally a five-rank title, and the status was equivalent to that of each department, and it could be further promoted according to personal contributions, so as to encourage everyone to study technology and do knowledge!

If you think of it, you will do it, with his current prestige, who would dare to jump out and oppose it, so he patted Song Yingxing on the shoulder cordially and said: "Chang Geng, then I will first wronged you to be the dean of Daming Institute of Technology, and it is also the fifth grade, and the price is doubled, don't worry about other things, just study metallurgical technology, I will give you ten more deputies, all of whom will be awarded the seventh rank to assist you in research, as for the candidates, you can choose them yourself, as long as you like them, whether they have merit or not!" “

When Song Yingxing heard this, he said excitedly: "Thank you for the emperor's grace." “

Zhu Cijiong nodded, pointed to the desk next to him and said, "Well, go get a pen and paper, I will tell you what you want to study." “

When Song Yingxing heard this, he couldn't wait to jump to the desk, quickly took the pen, ink, paper and inkstone, put it on the conference table, brushed a few times to polish the ink, and picked up the pen and waited.

Zhu Cijiong sorted out his thoughts and said slowly: "What I want you to develop is an alloy called tool steel, the so-called alloy is to fuse several different metals together in a certain proportion, like bronze, that is, the alloy of copper and lead, this kind of tool steel alloy, the strength is far beyond that of high-carbon steel, is a good material for making various machine tools, but the metal that is fused is not recorded in the ancient books, and it needs to be trial-produced in the same way, these metals are manganese, chromium, vanadium, tungsten, cobalt, molybdenum. “

Zhu Cijiong said as he gestured with his fingers on the table and showed Song Yingxing the words one by one.

If Zhu Cijiong wants to purify that kind of metal first, it is none other than tungsten, because the tungsten wire inside and the glass outside are the light bulbs, and now that there are electricity, wires, and glass, there is a shortage of tungsten wires.

Zhu Cijiong thought for a while and continued: "First, you first find a way to refine tungsten, tungsten is a steel-gray or silvery-white metal, mainly extracted from wolframite and scheelite, in the Huguang area of Daming A large amount of scheelite, scheelite color is gray-white, there are also yellow-brown, green and light red, etc., with grease luster, generally biconical octahedral or plate-like crystals, the crystal surface sometimes visible oblique stripes, and some crystals are shell-like, kidney-like, granular and dense block-like. “

In order to speed up the progress, Zhu Cijiong didn't bother to play dumb riddles, and directly poured out all the appearance attributes and origins of tungsten ore, and then, he continued: "The smelting methods of this tungsten mainly include soda sintering method and hydrochloric acid decomposition method, soda, also known as alkali, is processed from salt and limestone, and the specific production method is ......."

Zhu Cijiong directly talked about the knowledge in his mind, Song Yingxing was a brush and a memory, Zhu Cijiong originally thought that he should have a lot of questions, but he didn't expect that from beginning to end, Song Yingxing had no questions at all, but nodded frequently and admired.

Looking at his expression, it is clear that he completely understands, this product is simply a genius in metallurgy!