Circuit boards in electronic equipment can be refined gold, a ton of waste cell phone circuit boards can be extracted about 250 grams of gold, compared to a ton of gold ore in our country's general grade can be extracted from 3 grams of gold to 6 grams. In other words, the circuit board "gold content" is more than dozens of times the general gold ore.
From the old cell phone to extract gold:
Not an easy thing. In addition to the gold, silver, copper and other metals contained in some parts of the cell phone, but also contains lead and mercury and other harmful substances, very likely to harm human health. If the most primitive way of burning boards, acid washing, etc., then the release of brominated flame retardants, formula 2, and other toxic substances will also have a serious impact on the environment.