Police Detective

This statement cannot be understood by anyone.

I’ve been learning potassium, calcium, sodium, magnesium, aluminum, copper, mercury, silver, and platinum since I was in junior high school.

Among common metals, gold is very stable and cannot be oxidized even if it is burned at high temperatures! The gold that can be seen in nature is basically elemental gold. How can there be such a thing as oxidized gold?

Because gold and silver are extremely stable in nature, they always exist as simple substances in nature, and their quantities are scarce, they were used as the earliest currencies. Except for human factors, almost all elements are the products of supernova explosions. Substances after iron basically have lower abundances as they go up. Gold comes after silver, so gold is rarer and precious.

The order in which humans smelt metals is actually exactly the opposite of the order mentioned above. The earliest ones were copper ware, and later iron ware became available. By the Napoleonic period, aluminum ware was something only the richest people could own.

Having said all that, what exactly is gold oxide?

"Yes, what is it?" Sun Jie asked. It's not like he has never studied chemistry, but who studies this thing?

"That's it." Bai Song rummaged through the sand: "The brown-black powder here is mostly soil, but one percent of it is actually gold oxide, gold trioxide, which is the most stable form of gold. Oxide."

"Then Wang Feng, how can he oxidize gold?" Detachment Qin was still a little confused. He had never heard of gold having such properties.

If you specialize in chemical engineering, such as using gold oxide to make coatings, you must know this, but everyone at the scene is extremely unfamiliar with this thing. Although gold oxide can be used as coatings, the cost

This is a kind of paint that weighs hundreds of grams per gram and is not even shiny. There are too few places where it can be used!

"This requires a series of chemical reactions." Bai Song began to talk:

"First of all, this Wang Feng, in addition to hydrofluoric acid, also bought nitric acid and hydrochloric acid, a mixture of concentrated nitric acid and concentrated hydrochloric acid, which is called aqua regia. Aqua regia is a highly corrosive substance, although it is not the same as fluorine. Antimonic acid and the like are still incomparable, but their oxidation properties have reached a terrible level. Aqua regia can corrode gold, but it cannot corrode plastics such as polytetrafluoroethylene.

When aqua regia reacts with gold, it will generate tetrachloroalloy acid, which is a needle-shaped crystal that is light yellow and deliquescent.

When you heat it, it turns into gold chloride and gold chloride.

These two chlorides react with caustic soda, namely sodium hydroxide, to produce gold hydroxide.

Then the gold hydroxide is heated to prepare gold oxide.

The reaction process here, except for the preparation and reaction of aqua regia in the first step, which requires a certain amount of technical content, the rest is simply heating, and then preventing poisoning during the heating period.

Oxidized gold is a brown or brown-black powder. If you put it into the soil and stir it a little more, as long as we don't understand this property, we will never find gold. "

"Is there such a thing?" Everyone was amazed. Isn't this too complicated? Although what Bai Song said seems very simple, who can remember it?

"How do you test whether what you said is right?" Qin Wushuang was not directly led astray 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. It's still a conjecture, because he has to report to the leader, so he doesn't just look at this inference.

"There are three ways to purify gold oxide into gold. One is to react with hydrochloric acid to turn into gold chloride again, and then become a solution, and then use more active metal powder such as iron powder in the solution to perform a replacement reaction; the second method is more It’s simple. Oxidized gold decomposes easily when exposed to light. When we put it in the sun, we will find changes; the third method is to heat it. When this thing is heated to 250 degrees Celsius, it can be completely decomposed into gold and oxygen.”

"Okay, first grab a handful of soil and put it in the sun to see if gold powder will form." Qin detachment nodded.

It was almost noon now, and the weather was not bad today. Everyone followed what Qin detachment said, filled some soil with a large piece of evidence paper, flattened it and placed it in the sun.

Money is not necessarily gold and silver, but gold and silver seem to be inherently money.

As time went by, everything went as Bai Song expected, and golden light gradually appeared in the soil!

Gold!

It makes sense for Grandet to love gold!

This kind of thing can indeed arouse people's most instinctive preferences!

The total amount of these soils is about 100 kilograms, and more than 1,300 grams of gold. Although it is not noticeable after being turned into oxidized gold and mixed in, once it becomes gold powder, the feeling is really wonderful.

What we call gold mines, how many grams of gold can be found in a ton of gold mines, is a real rich ore!

At this time, the value of this pile of soil suddenly increased countless times with this discovery.

In fact, the seizure here is very simple, just a few seals. If a thief really knows this, he must have come in and stolen it long ago. But in fact, no one has ever thought about this, and Wang Feng naturally cannot tell anyone about this. people.

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. It’s not because of him, but he deserves the credit, blessing general! Detachment Qin immediately took photos and then called Director Ma.

Although he was very excited, he could not forget the rules of reporting step by step. As for reporting to Director Yin, we still have to wait until all the gold is extracted before making a review.

What if there are only 100 grams in it?

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

The rest of the professional stuff is left to professionals.

Whether it is separation of soil or heating, it is not Bai Song's turn to do it. The value involved in this matter is very large. The value of these golds is nearly 400,000. No one dares to take it lightly. A group of nearly 10 people escorted the approximately 100 kilograms of soil. , went to a specialized laboratory together.

In order to prevent the cleaning from being incomplete, I even brought a few vases with me.

The steps here are very simple. To put it bluntly, even an old man in the countryside can do it.

Wouldn't it be nice to put 100 kilograms of soil in a pot and fry it, then fry it to get gold, and then pan for gold?

Of course, this is not what the laboratory does. Instead, it is first dissolved, stirred, centrifuged, separated, etc., and then specially heated. After all, even gold oxide is much denser than soil.

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

Facts have proved that detachment Qin’s worries were unnecessary. 1,326 grams of gold powder has been purified!

Are you satisfied with this idea?

Afraid of being scolded, I updated it overnight.

Tomorrow begins a period of daily pretense, followed by further growth.

Volume 5 is about halfway done now.