Separation and recovery of precious metals from solid waste and hazardous waste

For different raw materials containing precious metals, there are different refining methods for separation and recovery of precious metals. The following are some common methods:

1. Acid extraction: Use acidic medium to dissolve metals, and then use reducing agents to reduce them into metal precipitates.
2. Cyanide extraction: Use cyanide to reduce metal ions into metal precipitates.
3. Oxidation-reduction method: Use oxidation-reduction reaction to reduce metal ions into metal precipitates.
4. Solvent extraction: Use organic solvents to extract metals.
5. Roasting method: Heat the metal-containing raw materials to a certain temperature to convert metal oxides into metals.

In short, different raw materials need to choose different methods for refining, and they need to be selected according to actual conditions.

Precautions for refining precious metals from waste:

1. Refining precious metals from waste requires certain chemical knowledge and experimental experience, and beginners need to be guided by professionals.
2. Pay attention to safety during the refining process to avoid contact and inhalation of chemicals.
3. Refining precious metals from waste requires certain costs, including raw material costs, equipment costs, and reagent costs, and cost control needs to be done well.
4. Refining precious metals from waste needs to comply with relevant laws and regulations, and illegal operations are not allowed.

In short, refining precious metals from waste is a profitable project, but it requires the support of professional knowledge and practical experience, and attention should be paid to safety and cost control, and it also needs to comply with relevant laws and regulations.

Pour the solution into a large amount of water, add a nitrate-dripping agent (I have a recommended nitrate-dripping agent here), wait for the gold powder to precipitate, filter out the gold powder and wash it with water several times, dry it, and melt it into a gold block with the auxiliary agent. This method is suitable for beginners, but you need to pay attention to safety. Wear gloves, goggles and other protective measures when operating.