The singular element is occasionally present in nature, but the number is minimal.
When the stibnite is calcined in the air, white cerium oxide can be obtained. If the cerium oxide is reduced with carbon, it is easy to obtain an elemental hydrazine. However, due to the low melting point of antimony, only 631 ℃, and antimony gray metal, so the ancient Chinese and foreign peoples have the mistaken lead, antimony or tin.
China is a country rich in stibnite, but it has never been mentioned in ancient times. Hunan Xinhua County is a well-known place for the accumulation of antimony ore. It was mined in the Ming Dynasty, but it is called a tin mine.
The content of cockroaches in the earth's crust is not too large, accounting for about 0.0001% of the total weight of the earth's crust. Its main minerals are stibnite (Sb 2 S 3 ) and strontium ore (Sb 2 O 3 ). China's Hunan Province is rich in antimony ore, which accounts for the first place in the world.
The general metal is thermal expansion and contraction, while the crucible is hot and cold. If the printed characters of the printed books are cast with pure lead, the words cast are not clear due to the thermal expansion and contraction of the lead, and the quality is not soft. If some enamel is added to the lead, the cast strokes are very clear and durable.
Some of the compounds of sputum can be used to treat diseases. For example, bismuth potassium tartrate injection is often used to treat schistosomiasis. Sodium gallate is the first drug in China, mainly used to treat chronic schistosomiasis. Sodium gluconate injection for intravenous or intramuscular injection can treat kala-azar.
Some compounds of bismuth such as indium antimonide and aluminum telluride are good semiconductor materials. They can sense infrared rays that are invisible to the human eye. Therefore, they can be used as infrared detectors to detect the movements of nighttime enemies in the military.
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