E-waste precious metal refining and extraction plan
The gold content of one ton of gold ore is about 15-20g. In contrast, a ton of used mobile phones has a much higher gold content than gold ore. But more than half of the materials in e-waste are harmful to the human body, and some are even highly toxic. A computer has more than 700 components, half of which contain various toxic chemicals such as mercury, arsenic, and chromium; electronic products such as televisions, refrigerators, and mobile phones also contain heavy metals such as lead, chromium, and mercury.
A method for extracting gold, silver and palladium from waste mobile phones, characterized in that: comprising the following steps:
1) Pretreatment of waste mobile phones, dismantling the waste mobile phones to obtain circuit boards, and sorting the circuit boards after crushing to obtain metal enrichments;
2) enrichment of precious metals, the metal enrichment is subjected to chlorination roasting, the material after the chlorination roasting is washed with water, and the washing residue is a precious metal enrichment;
3) recovery of silver; the precious metal enrichment is dissolved by nitric acid, the obtained solution is precipitated by chloride, and the obtained silver chloride is dissolved by ammonia, and the solution is reduced to obtain silver powder;
4) recovery of gold, nitric acid dissolving slag through chlorination leaching, the obtained solution containing gold palladium is replaced by zinc powder to obtain slag rich in gold palladium and then through secondary chlorination leaching, the obtained leaching solution is obtained through sodium nitrite reduction to obtain gold powder , the gold powder is smelted to obtain a gold ingot;
5) The recovery of palladium, the solution after the reduction of gold is added hydrazine hydrate according to 2-4 times of the palladium mole number, the reduction time is 1-2 hours, and the reduction temperature is 65-95 ° C to obtain palladium powder.
Precious metal recycling customer site
Of course, the entire extraction process requires professional technical and equipment support. SUNY GROUP is a professional manufacturer of electronic waste recycling equipment, with a complete set of electronic waste recycling and processing equipment and solutions, such as common circuit board dismantling machines, circuit board crushing Selection of recycling equipment, precious metal extraction equipment, etc., according to the needs of customers, we can formulate corresponding precious metal recycling design plans and equipment. If you have any questions or are interested, please feel free to contact us.
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