This statement does not make anyone understand.

In junior high school, potassium, calcium, sodium, magnesium and aluminum..... Copper, mercury, silver, platinum.

Among the common metals, the properties of gold are very, very stable, and they cannot be oxidized by burning at high temperatures! The gold that can be seen in nature is basically elemental gold, how can there be such a thing as oxide gold?

Because gold and silver are extremely stable, they have always existed in nature as elemental substances, and they are scarce in quantity, so they were used as the earliest currencies. In addition to the human factor, almost all elements are the products of supernova explosions, and the substances after iron are basically less abundant the further they go, and gold is behind silver, so gold is more scarce, and preciousness is inevitable.

The order in which human beings smelt metals is actually the opposite of the above order. The earliest were bronze, and later iron, and by the Napoleonic period, aluminum, which was the only thing that could be owned by the richest people.

Having said all that, what exactly is gold oxide?

"yes, what the hell is it?" Sun Jie asked, it's not that he hasn't studied chemistry, but who learns this thing?

"That's it. Bai Pine rummaged through the sand: "The brown and black powder in it is mostly soil, but one percent of it is actually gold oxide, gold trioxide, that is, the most stable compound of gold." ”

"Then this Wang Feng, how can he oxidize the gold?" The Qin detachment was still a little puzzled, he had never heard of gold having this kind of property.

If you are specialized in chemical industry, such as using oxide gold to make paints, you must know this, but everyone on the scene is extremely unfamiliar with this thing. Because although gold oxide can be used as a coating, the cost...

This is a kind of paint that is hundreds of grams a gram and is not shiny, and there are too few places to use it!

"This requires a series of chemical reaction processes. Bai Song began to tell:

"First of all, in addition to hydrofluoric acid, this Wang Feng also bought a mixture of nitric acid and hydrochloric acid, concentrated nitric acid and concentrated sulfuric acid, which is called aqua regia. Aqua regia is a very corrosive substance, although it is still incomparable with fluoroantimonic acid, etc., but the oxidation has reached a very terrible degree, aqua regia can corrode gold, but not plastic.

Aqua regia reacts with gold to produce tetrachloroalloy acid, which is a pale yellow deliquescent needle-like crystal.

When you heat it, it becomes gold chloride and gold chloride.

These two chlorides react with caustic soda, also known as sodium hydroxide, to form gold hydroxide.

Gold oxide is then heated to prepare gold oxide.

In this reaction process, the preparation and reaction of aqua regia in the first step requires a certain technical content, and the rest is simply heated, and then poisoning can be prevented during heating.

Oxide gold, on the other hand, is a brown or brownish-black powder, and if we mix it in the soil a little more, as long as we don't understand this property, we will never find gold. “

"And this kind of thing?" everyone was amazed, this is too complicated, isn't it? Although what Bai Song said seems to be very simple, who can remember it...

"How can you test that what you said is right?" Qin Wushuang was not directly biased by Bai Song's words, he had experienced all kinds of bizarre cases, but at this moment, the first thing was to make sure that what Bai Song said was true or conjecture, because he wanted to report to the leader, not just look at this inference.

"There are three ways to purify gold oxide into gold. One is to react with hydrochloric acid, turn into gold chloride again, and then become a solution, and then use iron powder and other more active metal powder in the solution for replacement reaction; the second method is simpler, gold oxide is easy to decompose when it sees light, we will find changes when we put it in the sun; the third method is heating, this thing can be completely decomposed into gold and oxygen when heated to 250 degrees Celsius. ”

"Okay, grab a handful of dirt and put it in the sun to see if it will produce gold dust. The Qin detachment nodded.

It was close to noon at this time, and the weather was not bad today, so everyone followed what the Qin detachment said, and used a large piece of evidence paper to hold some soil, flatten it and put it in the sun.

Money doesn't have to be gold and silver, but gold and silver seem to be inherently money.

As time passed, everything was expected by the white pine, and these soils gradually saw golden light!

Oh gold!

Grandet loves gold, and for good reason!

This kind of thing is indeed the most instinctive preference that can arouse people!

These soils add up to about 100 kilograms, more than 1,300 grams of gold, and although it is inconspicuous when it is mixed into oxide gold, once it becomes gold dust, it feels really wonderful.

Our so-called gold mines, a few grams of gold can be found in a ton of gold mines, they are all real bonanzas!

At this time, the value of this pile of soil, with this discovery, has risen sharply countless times.

In fact, the seizure here is very simple, it is a few seals, if there is really a thief who knows this, he must have come in and stole it a long time ago, but in fact, no one has ever thought about this, and Wang Feng naturally can't tell anyone about this.

The bright orange golden light stimulated everyone's adrenaline at this time, and the Qin detachment was also a little excited.

In any case, today is his first time here, and it is not his credit that he has also credited, Lucky General! The Qin detachment immediately took a photo, and then dialed Director Ma's phone.

Although he was very excited, he couldn't forget the rule of reporting level by level. As for reporting to Director Yin, you still have to wait for all the gold in it to be withdrawn before making a review.

What if there's only 100 grams in it?

Of course, this is basically impossible, if Wang Feng put his eggs in different baskets at this time, he would have been discovered a long time ago.

The rest of the things, professional things, are done for professional people.

Whether it is separating the soil or doing heating, it is not the turn of the white pine to do it, this matter involves a very large case value, the value of these gold is nearly 400,000, no one dares to take it lightly, a group of nearly 10 people, escorting about 100 kilograms of soil, went to a special laboratory together.

In order to prevent the cleaning from being unclean, even a few vases were brought.

The steps here are very simple, to put it bluntly, there is a way for an old man in the countryside.

100 kilograms of soil, put it in a pot and fry it, and then fry it out of gold, and then pan for gold.

Of course, the laboratory does not do this, but first dissolves, stirs, centrifuges, separates, etc., and then heats it up... After all, even oxide gold is much denser than soil.

It's just that this thing, after evenly mixing 100 kilograms of soil, no one can feel that the soil will become heavier, otherwise it would have been discovered a long time ago.

And it turned out that the worries of the Qin detachment were superfluous, 1326 grams of gold powder, purified and completed!

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