Many electronic boards such as computer boards, mobile phones and tablets contain amounts of gold, which can be recovered by operating on these parts; For this reason, this work is also called gold recycling. In 1984, Zarjoyan Pasargad Company became the first company in Iran to recover and recycle electronic components and separate precious metals such as gold, silver, palladium, rhodium, copper and lead and has been working in this field since 1984.