How does the National People's Congress discuss the separation of broken glass and broken diamonds?

2023-11-22 05:08:11
Abstract Cause: At about 6 pm on August 18, a jewelry store in Tianyi Square in Ningbo suddenly rushed into a car. According to witnesses at the scene, a female driver who drove the Honda Accord around the age of 40 was opposite. When the parking lot came down, when the card was swiped, the throttle was mistakenly braked, which caused it...
Cause: At about 6 o'clock in the evening on August 18, a jewelry store in Tianyi Square in Ningbo suddenly rushed into a car. According to witnesses at the scene, a female driver who drove the Honda Accord around 40 years old stopped from the opposite side. On the field, when the card was swiped, the throttle was mistakenly braked, which caused the traffic accident.
Originally this was an ordinary traffic accident and no injuries. However, it was a jewellery shop, which was a big problem.
Jewelry stores generally put the most expensive things at the door to attract business. However, after such a collision, all the seven counters in the jewelry store were smashed. The most valuable 1.5-carat diamond ring, loose diamond, 100-gram gold necklace and gold bars in the store counter were damaged to varying degrees.
The most terrible thing is: a lot of diamonds, jewelry and broken glass, mixed together, points! Do not! open! Now! You think, those broken diamonds and broken glass... It’s really hard to look at it with the naked eye.

Live picture
After the accident, the onlookers of the melons gathered around the National People’s Congress to discuss how to separate the broken diamonds and broken glass. After finishing the Chinese superhard material network, there are probably the following methods:
1. Put in water and sort by using different refractive indices of glass and diamond.
The refractive index of glass is similar to that of water. After being placed in water, the glass hardly refracts and is almost invisible. The refractive index of the diamond is about 2.4. After being placed in the water, the refractive effect is similar to that of the glass in the air. It is then easy to tell which ones are diamonds and which ones are glass. But in case of special glass with a high refractive index, this method is not good.

a mixture of diamonds and glass

After pouring the water with a refractive index of 1.33, the diamond is almost unchanged, and the glass can only see the outline faintly.

If you change to a higher refractive index of saline or sugar water (80% sugar water refractive index is 1.49)
Should be easier to distinguish
2, heavy liquid separation method
As mentioned above, if a special glass with a high refractive index is encountered, the above refractive index resolution method may fail. And diamonds are so expensive, the simplest method should be used to avoid manual sorting and hazardous reagents. The glass density is generally 2.5-3.0 g/cm3, and the diamond is generally 3.5-3.53 g/cm3. So you can use the heavy liquid separation method.
For example, all of the glass of 3 g/cm3 or less is floated up with an aqueous solution of sodium tungstate. Pour off the suspension and leave the diamonds.

3. Fluorescence separation method
It has also been suggested that diamonds are fluorescent, that is, they emit fluorescence that is visible to the naked eye under ultraviolet or x-ray illumination. Generally blue or white or light yellow. It can be distinguished by UV lamp, fluorescent lamp or counterfeit pen. This method can also distinguish some other gems or minerals.

Figure: Different degrees of luminescence of diamonds of the same intensity
In addition, it is also possible to separate by using the oleophilic hydrophobicity, acid and alkali resistance of the diamond.
Finally, do you have a better way? After all, everyone will give a little wisdom, and the world will become a beautiful world.
China's superhard materials network is now open to the "speaking" system, let's discuss it together.

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