There is not much room for appreciation of copper mines, because the prices of aluminum and copper are very high now, and there is not much room for appreciation and it is not easy to store (unless you buy futures). Copper is a chemical element with the English name copper, symbol Cu and atomic number 29. It is a soft and malleable metal with high thermal and electrical conductivity. The surface of pure copper just exposed is red and orange. Copper is often used as a component of thermal conductors, electrical conductors, building materials and various metal alloys. Copper alloys have excellent mechanical properties and low resistivity, among which bronze and brass are the most important. In addition, copper is also a durable metal, which can be recycled many times without damaging its mechanical properties.

1. Is copper a rare metal?

Copper is not a rare metal. Copper is a metal element and a transition element with atomic number 29. Pure copper is a kind of soft metal. When it is just cut, its surface is reddish-orange with metallic luster, and its simple substance is purplish red. Good ductility, high thermal conductivity and electrical conductivity, so it is the most commonly used material in cables, electrical and electronic components, and can also be used as building materials to form a variety of alloys. Copper alloys have excellent mechanical properties and low resistivity, among which bronze and brass are the most important. In addition, copper is also a durable metal, which can be recycled many times without damaging its mechanical properties.

2. How is copper extracted?

① Pyrometallurgical copper smelting: Pyrometallurgical copper smelting is the main method to produce copper at present, and more than 80% of the copper in the world is extracted from copper sulfide concentrate by pyrometallurgical method. The most prominent advantages of pyrometallurgical copper smelting are strong adaptability, low energy consumption and high production efficiency.

(2) Copper hydrometallurgy: Copper hydrometallurgy is a method of extracting copper from solution. Copper can be extracted from poor ore or rich ore, oxidized ore or sulfide ore by hydrometallurgy. The advantages of copper hydrometallurgy are simple equipment and easy operation. Copper can be extracted at room temperature without using blast and smelting equipment, saving fuel. Copper can be produced in this way as long as there is bile water.

3. Can copper be welded?

Yes, copper can be welded. However, the welding methods of cooked copper and raw copper are different. Usually, the commonly used welding methods are lead welding and fusion welding. Lead welding is a kind of high frequency welding. If it is fusion welding, it is high temperature welding.

4. How to clean copper?

(1) Add lemon slices into clean water, heat until the water bubbles, and turn off the fire and soak for 10 minute to soften the surface attachments. Then clean it with a soft sponge and rub it hard.

(2) Prepare salt vinegar solution, add salt and white vinegar into the empty bowl, and stir evenly for later use. Find a soft cloth to clean and wipe the bronze ware, and wipe it again to restore the light. After wiping it all, wash it with clear water and dry it with a dry towel.