Gold and silver have become important materials for modern industry and national defense construction. Due to limited reserves, production difficulties, low output and rising prices, many industrialized countries attach great importance to the exploitation of precious metal renewable resources as an inexhaustible "gold mine". They put the recovery of precious metal waste in the same important position as the development of mineral resources and established the management system of precious metal recovery industry.
E-waste is all kinds of discarded electronic products. Mobile phones, computers and other household appliances are updating faster and faster, and many used household appliances are discarded casually. Experts say that these discarded electronic wastes still have good utilization value. For example, some old mobile phones, computers and other parts can pick out gold-containing components and extract gold. From 1 ton electronic board, 130 kg of copper, 20 kg of tin and 0.45 kg of gold can be separated. "E-waste" has suddenly become an industry that hides huge profits.
It is reported that many components of electronic products are made of gold, which is a good conductor of electricity and never rusts. 1 g gold can draw 3000 meters of filaments thinner than hair, and the processability is very good. Today, in the pursuit of miniaturization of computers, mobile phones and other electrical products, gold is an indispensable material for electronic circuits. Discarding old mobile phones will seriously pollute the environment, but if the waste batteries in them are recycled to 1 ton, 200 grams of gold can be extracted, while ordinary gold-bearing ore (sand) can only extract 2 grams per ton. The gold content in e-waste is much higher than that in raw ore, usually hundreds of times higher. The cost of recovering gold from electronic waste is much lower than that of raw ore, and the economic benefit is very obvious. In addition, many external materials and internal metal parts of waste electronic products can be reused, resulting in greater value. Therefore, a large amount of electronic waste is a small "gold mine".
It seems that "turning stone into gold" can only be seen in fairy tales. If someone told you that he had the technology to turn garbage into gold, would you believe it? But this is not a fantasy.
A magical technology; 100 tons of electronic waste recycling and refining 30 kilograms of gold.
A relatively complete wet process for recovering precious metals such as gold and silver from electronic wastes, through the processes of dissolution, adsorption, refining, drying and smelting, products with gold (silver) content reaching the national gold (silver) standard can be obtained. This technology can treat electronic waste and extract 30 kilograms of gold from 100 tons of electronic waste. Worth more than 3 million yuan.
Electronic waste is used to extract gold. What's the difference between this kind of gold and gold extracted from mines? Will the texture and purity be different People may have such questions. People are used to the gold collected in mines, but there are still some doubts about the gold extracted from this "electronic waste". After strict monitoring, gold extracted from electronic waste can be directly obtained, and the gold (silver) content can reach the No.2 gold (silver) standard, which means that the purity of gold reaches 99%. Therefore, there is no difference between gold produced and refined from e-waste and gold obtained from mining. If there must be a difference, the cost of recycling e-waste is much lower than that of mining from mines.
Developed countries recover a large amount of gold and silver from secondary resources every year. At present, the annual profit of electronic waste disposal enterprises in the United States has reached 25 million to 30 million dollars. According to statistics, mining 1 ton of silver needs about 300,000 yuan, and recovering 1 ton of silver only needs 1 10,000 yuan; Mining 1 ounce of gold costs $300, and recovering 1 ounce of gold only costs 10. If the waste batteries in old mobile phones are recycled and accumulated to 1 ton, 200 grams of gold can be extracted from them.
At present, there are 150-200 large-scale state-owned, private or joint-venture precious metal recycling production enterprises in China (excluding companies that recycle waste jewelry and precious metal smelting enterprises). But the recycling units are scattered, the recycling equipment is crude, the technology is backward, the recovery rate is not high, and resources and energy are wasted. There are many small workshops for precious metal recycling in China, and the emergence of these individual businesses for precious metal recycling has played a certain role in the recycling of precious metal waste.
According to statistics, there are currently 350 million TV sets, 654.38+300 million refrigerators and 654.38+700 million washing machines in China. Since 2003, China has to scrap at least 5 million TV sets, 4 million refrigerators and 5 million washing machines every year. In addition, the consumption of computers and mobile phones in China has surged in recent years. At present, about 5 million computers and100000 mobile phones have entered the elimination period. Such a large amount of electronic waste should be recycled.
Source: China Electronic Waste Network News.