Metal copper, element symbol Cu, atomic weight 63.54, specific gravity 8.92, melting point 1083oC. Pure copper is light rose or light red, and the surface is copper-colored after forming a copper oxide film. Copper has many valuable physical and chemical properties, such as high thermal conductivity and electrical conductivity, strong chemical stability, high tensile strength, easy welding, corrosion resistance, plasticity, and ductility. Pure copper can be drawn into very thin copper wires and made into very thin copper foils. It can form alloys with zinc, tin, lead, manganese, cobalt, nickel, aluminum, iron and other metals.
The development of
copper alloy tempering technology has gone through a long process, but so far copper tempering is still dominated by fire tempering, H65 brass wire | H62 brass capillary | H59 brass row | QSn6.5-0.1 tin bronze rod | imported The output of tin bronze tube | tin bronze plate accounts for about 85% of the total international copper output. 1) Fire tempering is generally to increase the raw ore containing a few percent or thousandths of copper to 20-30% through ore dressing, and use it as copper concentrate in a closed blast furnace, reverberatory furnace, electric furnace or flash furnace The matte smelting is carried out, and the molten matte (matte) produced is then sent to the converter for blowing into blister copper, and then oxidized and refined in another reverberatory furnace to remove impurities, or cast into anode plates for electrolysis, and the grade is as high as 99.9% electrolytic copper. The process is simple and adaptable, and the recovery rate of copper can reach 95%. However, because the sulfur in the ore is discharged as sulfur dioxide waste gas in the two stages of matte making and blowing, it is not easy to recycle, and it is easy to cause pollution.
In recent years, melt pool smelting such as the Baiyin method and the Noranda method, as well as the Mitsubishi method in Japan, and the fire method have gradually developed towards continuous and automated methods. 2) Modern wet smelting methods include sulfuration roasting-leaching-electrodeposition, leaching-extraction-electrodeposition, bacterial leaching and other methods, which are suitable for heap leaching and tank leaching of low-grade complex ores, copper oxide ores, and copper-containing waste ores. or in-situ leaching.
