Police Detective

　　 This statement cannot be understood by anyone.

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

　　 Among the common metals, the properties of gold are very, very stable, and cannot be oxidized even when burned at high temperatures! The gold that can be seen in nature is basically elemental gold. How can there be such things as oxidized gold?

　　Because gold and silver are extremely stable in nature, they have always existed as simple substances in nature and are scarce in quantity, so they are regarded as the earliest currency. Except for human factors, almost all elements are the products of supernova explosions. The material after iron is basically less abundant in the future, and gold is behind silver, so gold is rarer and precious is inevitable.

　　 The order of human smelting of metals is actually the opposite of the above order. The earliest were bronzes, but irons were later introduced. In Napoleon's time, aluminum was the only thing that the richest people could own.

　　 Having said so much, what exactly is gold oxide?

　　 "Yeah, what the **** is it?" Sun Jie asked. It's not that he hasn't studied chemistry, but who studies this stuff?

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

　　 "Wang Feng, how could he oxidize the gold?" Qin Detachment was still a little puzzled, he had never heard of gold still having such properties.

　　 If you are specialized in chemical engineering, such as using gold oxide as paint, you must know this, but everyone on the scene is very unfamiliar with this thing. Because gold oxide can be used as paint, but the cost...

　　 This is a paint that is hundreds of grams per gram and is not shiny yet. There are too few places to use!

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

"First of all, besides hydrofluoric acid, this Wang Feng also bought a mixture of nitric acid and hydrochloric acid, concentrated nitric acid and concentrated sulfuric acid, called aqua regia. Aqua regia is a very corrosive substance, although it is not Fluorantimonic acid is still incomparable, but the oxidation has reached a terrible level. Aqua regia can corrode gold, but not plastic.

　　 Aqua regia reacts with gold to produce tetrachloroalloy acid, which is a kind of light yellow needle-like crystals with deliquescent properties.

　　 When it is heated, it will become gold chloride and gold chloride.

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

　　 Then heat the gold hydroxide to prepare gold oxide.

　　 In the reaction process, the first step of the preparation and reaction of aqua regia requires a certain technical content. The other is simply heating, and then preventing poisoning during heating.

　　 Gold oxide is a kind of brown or brownish black powder. Put it in the soil like this. If you mix it more and stir it, as long as we don’t understand this property, we will never find gold. "

　　"Is there such a thing?" Everyone is surprised. Isn't this too complicated? Although what Bai Song said is very simple, but who can remember...

"How to verify that what you said is right?" Qin Wushuang was not directly biased by Bai Song's words. He has experienced various bizarre cases, but at this moment, the first thing is to make sure that what Bai Song said is true. Still guessing, because he wants to report to the leader, but 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 become gold chloride again, and then become a solution, and then use iron powder and other more active metal powders in the solution for substitution reaction; the second method is more Simply, gold oxide is easy to decompose when exposed to light. We will find changes when we put it in the sun; the third way is to heat, this thing can be completely decomposed into gold and oxygen when heated to 250 degrees Celsius.

　　 "Okay, first grab a handful of soil and place it in the sun to see if gold dust will form." Qin Detachment nodded.

　　 It was almost noon, and the weather was pretty good today. Following what the Qin Detachment said, everyone used a large piece of evidence paper to fill some soil and spread it out in the sun.

　　Currency is not necessarily gold and silver, but gold and silver seem to be money by nature.

　　 With the passage of time, everything is as expected by the white pine, and the golden light is gradually seen in these soil!

　　 Gold!

　　 Grande loves gold, it makes sense!

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

　　 These soils add up to about 100 kilograms and more than 1,300 grams of gold. Although it is not conspicuous after being mixed into oxide gold, once it becomes gold dust, it feels really wonderful.

　　 What we call a gold mine, a few grams of gold can be found in a ton of gold mine, it is a real rich ore!

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

In fact, the seizure here is very simple. It is just a few seals. If a thief knew this, he would have come in and stole it. But in fact, no one had thought about it. And Wang Feng, naturally, it is impossible to tell anything about it. people.

　　The golden light of bright orange stimulates everyone's adrenaline at this time, and the Qin Detachment is also a little excited.

　　 Anyway, today is the first time for him to come. It is not his credit that he also has credit, Fu Jiang! Qin Detachment immediately took a picture, and then called Director Ma's phone.

　　Although he is very excited, the rules of escalation should not be forgotten. As for reporting to Director Yin, we still have to wait for all the gold in it to be extracted before making a comment~www.wuxiaspot.com~ What if there is only 100 grams in it?

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

　　 The remaining things, professional things, do for professional people.

Whether it is separating the soil or heating, it is not the turn of the white pine to do it. This matter involves a very large case value. The value of the gold is nearly 400,000. No one dares to take it lightly. A group of nearly 10 people escorted the 100 kg of soil. , Went to a special laboratory together.

　　 In order to prevent the cleaning up, even a few vases were brought.

　　The steps here are very simple. To put it bluntly, there are ways for an old rural man.

　　 100 kilograms of soil, stir fry in the pan, then fry the gold, and then pan for gold, is it all right?

　　Of course, the laboratory does not do this, but first dissolves, stirs, centrifuges, separates, etc., and then specializes in heating...After all, even gold oxide has a much higher density than soil.

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

　　 And it turns out that Qin Detachment’s worries are superfluous, 1326 grams of gold powder, purification is complete!

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