Increasingly accumulation "urban mining"

Author:Suny Group

In the late 1980 s, Japanese scholars take the lead in put forward the concept of "urban mining". Many electric and electronic products contained in the precious metal, but is rarely after abandoning recycling use. The concept of "urban mining" to refer to the renewable resources waste electric and electronic products.

These resources include a huge amount of metal components. Relevant data shows, one ton of waste mobile phones, 400 grams of gold can be obtained, and 2.3 kg of silver, and 172 grams of copper; 1 ton of waste personal computers, can be extracted 300 grams of gold, 150 g 1 kg of silver, copper and other rare metals nearly 2 kg.

Since the industrial revolution less than three hundred years, the world more than 80% of the available mineral resources has transferred from underground to ground, total up to hundreds of billions of tons. Electronic waste contains a large number of iron, copper, aluminum, rare metals, resources, such as plastics and glass after centralized disposal processing, 60% ~ 80% of the material can be separated into renewable resources.

In mobile phones, for example, battery cobalt content as high as 20% above, become the biggest application of cobalt resource areas, accounting for more than 30% of the cobalt resources. Represented by the cell phone battery waste battery recycling, is equal to the mining of scarce resources of cobalt concentrate. Smart phones in China in 2013 to 580 million units, up 60.3% from a year earlier. Mobile phone cicc content of 280 g/t, the content of silver, 2000 g/t, equivalent to 60 of run of mine ore, respectively, and more than 13 times.

According to the UN environment programmer, estimates that 20 million to 50 million tons of e-waste each year all over the world, including the United States accounts for about a third, the European Union accounts for about a quarter of global e-waste annual growth of 3% ~ 5%. How to effectively utilize these resources, has become one of the focus of the circular economy development.