For the wire and cable industry, the most obvious material alternative is to use aluminum conductors instead of copper conductors. In the relative cost of copper and aluminum conductors, the factors of price, specific gravity and conductivity need to be considered in order to find out whether aluminum conductors are the real cost-saving answer. Copper is heavier than aluminum. The specific gravity of copper is 8.9g.cm3, the specific gravity of aluminum is 2.7g / cm3, that is to say, the weight of copper conductor is 3.3 times that of aluminum conductor under the same conductor specifications. However, the electrical conductivity of aluminum is only 61% of that of copper, that is to say, the aluminum conductor has a cross section of 61% greater than the copper conductor at the same transmission current. Therefore, in terms of conductor weight, to make both conductors have the same current carrying capacity, the weight of copper conductor required is about twice the aluminum conductor. In addition, the price ratio of copper and aluminum is about 3.5, so the cost of equivalent copper conductor is 7 times that of aluminum conductor.
Of course, the simple cost comparison described above does not explain all the problems. Since the cable product is a product with the standard conductor specifications, it is not possible to buy an aluminum cable with the same electrical conductivity as the copper cable. Therefore, if cables are made of aluminum conductors, a larger aluminum conductor must be used. Experience has shown that in the case of the same current carrying capacity, aluminum conductor cable conductor cross-section should be 2 times the cross-section of copper cable conductor. Since the aluminum conductor length is twice as large as the conductor length of the copper conductor, the consequent increase in insulation, sheathing and sheathing of the aluminum conductor cable impairs the price advantage of using an aluminum conductor. This means that the price advantage of aluminum compared to copper is insignificant, since the conductor is only a fraction of the total cost of the cable, after all.
Taking a 70mm2 copper-core cable as an example, the cost of a copper conductor is about 65% of the cost of the entire cable, while the cost of a 120mm2 aluminum cable carrying the same amount of current can be saved by 23.5%. If the copper conductor costs 80% of the cost of the entire cable, the savings of up to 46% in aluminum-core cables with equivalent current carrying capacity can be achieved. Aluminum cables lose their cost advantage only if the cost of copper conductors in the cable drops below 50% of the cost of the entire cable. The cost of most of the copper low voltage cables and many medium voltage cable conductors is now over 50%, so the cost savings of aluminum power cables are considerable when compared to copper power cables .
Above-mentioned equipment was successfully developed by Changchun Gold Research Institute in 1998. It has possessed three patents and five monopolized technologies. Desorption solution does not contain sodium cyanide, it can reduce the grade of barren carbon down to 100g/t. The key technology of this equipment is that it can ensure the balance of metal quantity, and avoids gold- accumulating and gold- floating from the equipment, ensures the technological index steady and low cost of it. The content about technological advantages has been broadcasted by Xing Huo Science and Technology of CCTV. This technology was appointed as the energy-saving technology of gold production by National Development and Reform Committee in 2006, and was also appointed as standard equipment in the industry by National Development and Reform Committee in 2007, it passed the technique identifying in 2003, and won the second award of science and technology of China National gold Association, the entire technical level is advanced at home. This equipment has won three patent rights of China. The patent numbers of it are separately: 01241537.5 01241538.5 200620029209.1
Gold Desorption,Fine Gold Separator,Gold Production Process,Gold Refinery Processing Plant
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