Due to the precise temperature, humidity and chemical requirements, it is generally not considered that copper can produce patina in a certain area by artificial means. However, there are also some advanced on-site patina generation systems, which have been proved to be quite successful after proper training. There are some copper producers in America.
Mainly under controlled conditions, it provides an advanced patina generation system for factories and fields. The patented chemical process results are used in the real chemical conversion coating of verdigris, which is widely guaranteed and produces verdigris.
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China imports copper scrap mainly from the United States, Japan, Germany and Russia, among which the United States ranks first, and the United States has strict regulations on the management of copper scrap. This paper takes the classification standard of America as a typical introduction.
In the United States, the copper material containing more than 99% Cu is usually called 1 copper, which can be directly remelted and used without further processing. Copper with a minimum copper content of 94.5% is called No.2 copper. This waste copper must be remelted before it can be used in the form of metallic copper.
Other common classification brands are lead brass, brass and low zinc brass, shell brass, automobile radiator, high copper brass (red brass), high-speed cutting brass and so on, which are widely used. Automobile waste is directly regenerated and used to reprocess brass products. It is in the form of alloy and has the same composition.
For manufacturers, its main advantage is that it greatly reduces the cost of net metal consumption. Waste copper is also used to produce copper chemicals, but it is difficult to obtain quantitative data.
Baidu encyclopedia-copper scrap