Summary: Knowledge about gold you don't know
1. Gold may be the first metal processed by prehistoric humans. As early as the Stone Age of more than 6,200 years ago, Bulgarian primitives began to process gold; more than 2,500 years ago, the ancient Egyptians mastered the gold purification technology;
Second, 50 grams of gold can be hammered into a gold foil with a thickness of about 0.1 micron and an area of ​​about 25 square meters; 1 gram of gold can be drawn into a gold wire of 66 kilometers long and less than 1 micrometer in diameter; 600 grams of gold can be stretched after being stretched. a circle of the earth;
Third, in ancient Europe, it was believed that gold was a perfect blend of absolutely pure sulfur and mercury. This was discovered by the early European alchemists;
Fourth, China has the saying that “swallowing gold to commit suicideâ€. In fact, the chemical nature of gold itself is stable, basically what it is like to swallow, and what it is like to pull out. The ancients believed that swallowing gold could kill, only because the swallowed gold pieces were too big or had sharp edges and corners. The result was that the digestive tract was broken or scratched. Of course, the gold that was refined at that time might not be pure. Other toxic substances;
5. According to the data released by the World Gold Council, humans have so far extracted a total of 170,000 tons of gold. It is necessary to use three and a half 50 meters × 25 meters × 2 meters of Olympic standard swimming pools to load these gold, more than half of which are in the past 50. Digging out in the middle of the year. If you divide this gold into 7 billion people around the world, each person can only get 24.3 grams.
The country with the largest gold reserves is the United States, reaching 8133.5 tons. China's gold reserves are 1054.1 tons, ranking sixth in the world. Nowadays, it has become increasingly difficult to mine gold, and even low-volume deposits that were previously unattended have been mined. In 2007, China replaced South Africa as the world's largest gold producer. This is also the first time South Africa has fallen from the top of the gold producing countries since 1905;
Sixth, the surface of the earth containing the most gold in the ocean, the estimated total reserves of about 10 billion tons. The biggest obstacle is that no one has found an effective way to extract gold from the ocean.
7. The chemical symbol of gold is Au, which is derived from Aurora, the goddess of the dawn of Roman mythology. However, in the Aztec language of ancient Mexico, gold is written as teocuitlatl, meaning "God's stool";
Eight, although gold itself will not cause pollution, but the way to refine gold will destroy the environment. Cyanide is used in the refining of gold. Cyanide is the designated drink of the World Espion Organization. Once discharged directly into the water, the consequences are unimaginable. In 2000, cyanide spilled from a gold mine in Romania caused serious pollution to the river. There was no living thing in the river, and 2.5 million people were drinking water.
In the same year, a serious chemical spill of sodium cyanide overturned hawthorn occurred in a purple gold mine in Fujian, China. Seven tons of sodium cyanide solution flowed into the creek of the mining area, causing 98 villagers to be poisoned. In addition, there are many people in China who suffer from “pneumoconiosis†because of gold mining.
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Label: Gold Purification Twilight Goddess Pneumoconiosis Cyanide Serious pollution
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