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A Brief History Of Nickel Discovery

wallpapers Industry 2021-01-18
Nickel is a transition metal element with element symbol Ni, located in group VIII of the fourth period, with atomic number 28. Nickel is a silver-white metal with good mechanical strength and ductility. It is insoluble in water and has strong corrosion resistance to acids and alkalis, but it is easily soluble in dilute nitric acid and aqua regia. High temperature resistance, melting point 1455 °C, boiling point 2730 °C. The density is 8.902g/cm³. It can be used to make currency, etc. It can be plated on other metals to prevent rust.
 
A brief history of discovery
 
Nickel plays an important role in the development of human material civilization. Because the melting points of nickel and iron are close, nickel was mistaken for good iron by ancients. In ancient times, Chinese, Egyptians and Babylonians used meteorite iron with high nickel content to make utensils, and because nickel did not rust, it was also regarded as silver by the Peruvian indigenous people. As early as 235 BC, my country began to use nickel minerals to make coins, and cupronickel, or copper-nickel alloy, was invented and used by our ancients in 200 BC. In 1751, Alex Fredrik Cronstedt of Stockholm studied a new metal called NiAs. He thought it contained copper, but what he extracted was a new metal, which was announced in 1754 and named nickel.
 
During the extraction process, the alloys of metal cobalt, arsenic and copper all appeared as trace contaminants, which were misunderstood by many chemists. It was not until 1775 that pure nickel was produced by Torbern Bergman, which confirmed that it is an element. . In 1952, there was a report that nickel was found in animals, and later it was suggested that nickel is an essential trace element in mammals. After 1975, research on the nutrition and metabolism of nickel was carried out.
 
The most important method for beneficiation of copper-nickel sulfide ore is flotation, while magnetic separation and gravity separation are usually auxiliary beneficiation methods. When flotation of copper sulfide nickel ores, collectors and foaming agents for flotation of copper sulfide minerals are often used. A basic principle for determining the flotation process is that it is better to allow copper to enter the nickel concentrate, and to avoid nickel entering the copper concentrate as much as possible. Because the nickel in the copper concentrate is lost during the smelting process, the copper in the nickel concentrate can be completely recovered.
 
The flotation of copper-nickel ore has the following four basic processes:
(1) Direct use of priority flotation or partial priority flotation process: When the copper content in the ore is much higher than the nickel content, this process can be used to select copper into a separate concentrate. The advantage of this process is that copper concentrate with lower nickel content can be directly obtained.
(2) Mixed flotation process: used to separate ores with copper lower than nickel, and the obtained copper-nickel mixed concentrate is directly smelted into high matte.
(3) Mixing-optimal flotation process: mixing flotation of copper and nickel from the ore, and then separating low-nickel-containing copper concentrate and copper-containing nickel concentrate from the mixed concentrate. After the nickel concentrate is smelted, high nickel matte is obtained, and the high nickel matte is then subjected to flotation separation.
(4) Mixing-preferential flotation and reclaiming part of nickel from mixed flotation tailings: When the flotability of various nickel minerals in the ore is very different, after the mixed flotation of copper and nickel, the tailings Further recovery of nickel-containing minerals with poor floatability.

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