Who will recycle this precious metal scrap?

Precious metal has become an important material of modern industry and national defense construction. Due to its limited reserves, production difficulties, low output, and rising prices, many industrialized countries attach great importance to the inexhaustible “rich mine” of precious metal renewable resources. They put the recovery of precious metal scraps in the same position as the development of mineral resources, and established the precious metal recycling industry.

Management system.

The benefits of recycling waste precious metals have become an important material for modern industrial and national defense construction. Due to its With limited reserves, difficult production, low output, and rising prices, many industrialized countries attach great importance to the inexhaustible “rich mine” of precious metal renewable resources. They put the recovery of precious metal scraps into the same position as the development of mineral resources, and established a management system for the precious metal recycling industry.

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 250,000 to 30 million US dollars. According to the statistics,

Mining 1 ton of silver requires about 300,000 yuan, and recovering 1 ton of silver is only 10,000 yuan; mining 1 ounce Gold needs $ 250 to $ 300 , recycling 1 ounce Gold only costs $ 100 . Such as cell phone inside the old battery recycling up to one ton can accumulate to distill from 1 00 grams gold.

The recycling system of waste precious metals has not been perfected. Through years of development, a waste precious metal recycling system has been initially formed in China, in which waste precious metal jewelry and scraps for making jewelry are recycled.

Precious metal mine tailings and smelting plant slag recovery and electrolytic plating waste ( liquid ) recovery have a relatively complete precious metal recovery system.

Currently, a large state-owned, private or joint recovery of precious metals manufacturers have a 150-200 home (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 quite a few small workshops for recycling precious metals in China. The appearance of these precious metals recycling self-employed, although expensive

The recycling of metal scrap plays a certain role, but the problems caused by environmental pollution are very serious.

Precious metal waste recycling 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. However, how to extract gold from such ore has always been a 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 method is to extract from gold ore containing arsenic sulfide by bacterial pre-oxidation technology. gold. 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 %. The method not only has a 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 catalysts for automobiles, 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 recovered than chemical methods.

Precious metal recycling urgently needs to support some enterprises in China already have the relevant technology and equipment for recycling electronic waste. However, the precious metal scrap recycling industry is still 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 treatment. policy. The state supports several modern precious metal recycling enterprises, and at the same time trains 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.

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