"China Gold News" reported HU Zhi-peng: the face of dwindling year after year growth in gold production resulting from non-renewable resources, sustainable development of gold mining have received increasing attention. The huge economic and social benefits brought about by the recovery of residual ore and precious metal scrap recycling industry are also highlighted. How to use resources scientifically and rationally and turn waste into treasure is still a new topic that is being gradually explored. The industry generally believes that the recovery of precious metal scrap should be placed on the same level as the development of mineral resources, and the establishment of the precious metal recycling industry and management system is in urgent need of state support.
The concept of recycling waste precious metals
Precious metals have become an important material for modern industrial and national defense construction. Due to their limited reserves, production difficulties, low output, and rising prices, many industrialized countries attach great importance to excavation.
The inexhaustible “rich mine†of precious metal renewable resources places the precious metal scrap recycling and mineral resources development on an equal footing, establishing a precious metal recycling and recycling industry and management system.
In developed countries, a large amount of gold and silver are recovered from secondary resources every year. At present, the annual profit of electronic waste disposal companies in the United States has reached 25 million to 30 million US dollars. According to statistics, mining 1 ton of silver requires about 300,000 yuan, and recovering 1 ton of silver is only 10,000 yuan; mining
Waste precious metal recycling system is not perfect
Through years of development, a set of waste precious metal recycling system has been initially formed in China, among which waste precious metal jewellery and jewellery waste recycling, precious metal mine tailings and smelting plant slag recovery and electrolytic plating slag (liquid) recovery are relatively complete. Precious metal recycling system.
Currently a large state-owned, private or joint recovery of precious metals manufacturers 150--200 House (excluding the company to recover scrap jewelry and precious metal smelting enterprises). However, the recycling units are scattered and cannot be scaled up, and the recycling equipment is rudimentary, the technology is backward, the recovery rate is not high, and resources and energy are wasted.
There are many small workshops for the recovery of precious metals in China. Although the appearance of these precious metal recycling self-employed households plays a certain role in the recovery of precious metal scraps, the environmental pollution problems caused by them are very serious.
Waste precious metal recycling new technology
In China has proven gold deposits, there are more than 700 tons of gold reserves belonging to the refractory gold-containing arsenic sulfide, which is a potential value of over 600 billion yuan, but how to extract gold from ore has been a kind of problem. The "Bacterial Gold Extraction Method" has overcome this problem and will make these difficult gold ores re-used effectively, bringing huge economic benefits. Bacterial gold extraction is the use of bacterial pre-oxidation technology to extract gold from gold ore containing arsenic sulfide. At present, this technology is only available in a few countries in the world. For refractory gold ore containing arsenic and sulfur, since the gold is encapsulated by sulfide minerals, the leaching rate of gold is very low when leached by conventional cyanidation. If the pre-oxidation of bacteria is carried out, the sulfide-containing mineral is destroyed, and the gold is dissociated. When leaching with cyanide, the leaching rate of gold can generally reach 90 %. This method not only has high leaching rate of gold, but also does not emit exhaust gas containing arsenic and sulfur, and the waste residue is also stable and does not pollute the environment.
In August 2003, a research team at the University of Birmingham invented fast and much cheaper method of recovering precious metal catalyst used in the car, and applied for a patent. The new recycling method immerses the metal in nitric acid and hydrochloric acid, and then through the reactor containing the bacteria, the metal is deposited on the cell wall and collected for recycling. The recycling process takes only 15 minutes and the efficiency is about 90 %. Studies have shown that biorecovered palladium is better than chemically recovered.
Precious metal recycling urgently needs policy support Â
Some enterprises in China already have the relevant technology and equipment for recycling electronic waste. This industry is a virgin land to be developed and should be supported by the state policy. Enterprises that recycle precious metals from used electrical appliances must first consider environmental protection and must adopt advanced technologies, equipment, and processes. However, it should also be noted that strict implementation of national environmental protection requirements, recycling facilities will be relatively large, and it is difficult to make profits at the beginning, which requires national preferential policies. The state supports several modern precious metal recycling enterprises, and at the same time, it must train a group of precious metal recycling technology talents and experts. Only by legally guaranteeing the huge source of cost recovery and recycling of precious metals, effectively solve the problems faced by precious metal recycling manufacturers, so that precious metal recycling enterprises have sufficient scrap metal raw materials and economic benefits, in order to make this industry healthy and benign development.
We can also learn from foreign advanced experience and establish certain management regulations to regulate the precious metal recycling market. For example, enterprises that enter the recycling of used electrical products can implement an access system, and enterprises that meet the national environmental protection standards and high precious metal recovery rate can enter this industry.SS Non Woven,SS Non Woven Fabric,Non Woven Fabric Material,Non Woven Fabric Raw Material
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