Nickel has the highest nickel content in the earth's core and is a natural nickel-iron alloy. Nickel is a nearly silvery white, hard, ductile and ferromagnetic metal element, which can be highly polished and corrosion-resistant, and belongs to ferrophile.
Rare metals usually refer to metals with less content or dispersed distribution in nature.
Precious metals mainly refer to: gold, silver and platinum group metals (platinum, palladium, rhodium, ruthenium, iridium and osmium).
Nickel mines in China are mainly distributed in the northwest, southwest and northeast, accounting for 76.8%, 65,438+02.1%and 4.9% of the total reserves in China respectively.
China has huge nickel resources, ranking second in the world and first in Asia, second only to Canadian sudbury nickel mine.
Extended data Metal nickel has almost no acute toxicity, and the toxicity of general nickel salts is also low, but nickel carbonyl can produce strong toxicity.
Nickel carbonyl is quickly absorbed by respiratory tract in the form of steam, and can also be absorbed by skin in a small amount. The former is the main way for poisons to invade the human body in the working environment.
When the concentration of nickel carbonyl is 3.5μg/m3, it will make people feel like lamp smoke, and when the concentration is low, it will make people feel uncomfortable.
After absorbing nickel carbonyl, it can cause acute poisoning, and initial symptoms such as dizziness, headache, unsteady gait, nausea, vomiting, chest tightness, etc. will appear in about 10 minutes.
The late symptoms after exposure to 12 to 36 hours are nausea, vomiting, high fever, dyspnea and chest pain.
The unique symptoms of human nickel poisoning are dermatitis, respiratory organ disorder and respiratory cancer.
Baidu encyclopedia-rare and precious metals
Baidu Encyclopedia-Nickel