A method of recovering scrap silver. The method includes obtaining scrap sources that include silver. The method also includes submerging the scrap sources in an aqueous solution of hydrofluoric acid (HF). The method further includes adding hydrogen peroxide (H.sub.2O.sub.2) to the aqueous solution of hydrofluoric acid to create a leachate. The method additionally includes extracting silver from the leachate.

Systems and processes for recycling printed circuit boards, wherein precious metals may be reclaimed. The system generally includes a number of modules to systematically remove materials from the printed circuit boards and to separate the precious metals from the materials.

Process for the production of particulate ruthenium with a purity of 99.99 wt. % and a specific surface area of 0.2-0.5 m.sup.2/g, comprising: (1) providing a hydrochloric solution prepared by dissolving RuO.sub.4 in hydrochloric acid and has a content of ruthenium in the form of dissolved ruthenium species of 15-22 wt. %; (2) providing an aqueous solution with an ammonium chloride content of 200-600 g/litre; (3) forming a reaction mixture by dosing the hydrochloric solution provided in step (1) to the aqueous solution provided in step (2) at a molar ratio of 1 mol ruthenium: 3-6 mol ammonium chloride, at a temperature of 55-90 C. over the course of 0.2-5 hours and while adjusting and maintaining a pH of 0.6 to 0; (4) separating solid material formed during step (3) from the hydrochloric reaction mixture; and (5) calcinating the solid material separated in step (4) at an object temperature of 350-1,000 C.

A method of selectively recovering palladium from a palladium-containing material comprises providing a leaching solution comprising hydrochloric acid, hydrogen peroxide, and an iron salt comprising one or both of ferric chloride or ferrous chloride and contacting a palladium-containing material with the leaching solution to dissolve palladium from the palladium-containing material. Related methods of selectively recovering palladium from a palladium-containing material are also disclosed.

The disclosure discloses an irreversible covalent organic framework for efficient and selective gold recovery and a preparation method thereof, and belongs to the technical field of precious metal recovery from an aqueous solution. In the disclosure, metal trifluoromethanesulfonate is used as a catalyst, and a solvothermal method is used to prepare a mother covalent organic framework, and then the corresponding structural unit is used to perform an exchange reaction to prepare an irreversible amide-linked covalent organic framework material. The disclosure solves the problem of preparation of high-stability irreversible covalent organic framework, the introduced amide bond gives the covalent organic framework the ability to quickly and selectively recover precious metal gold from an aqueous solution, and the covalent organic framework can be used repeatedly. The application of the covalent organic framework as an efficient adsorbent in the field of adsorption and separation is expanded, and a new material is provided for efficient recovery or removal of metal salts.

Ways of obtaining a mineral rich powder from an electronic waste substrate include a shredder configured to receive the electronic waste substrate and process the electronic waste substrate into a plurality of fragments. A mill is provided that includes a container configured to receive the plurality of fragments, the container including a milling media, the mill configured to abrade the plurality of fragments with the milling media to produce a milled product. A separator is provided that is configured to receive the milled product, where the separator is configured to apply a predetermined size selection to the milled product to provide a first output including a plurality of particles and a second output including a plurality of abraded fragments. A skid is coupled to and provides structural support for the shredder, the mill, and the separator.

The present invention is related generally to recovering metals from waste electronics, and more particularly to a process to recover copper and gold commonly found in waste printed circuit boards using a lixiviant containing a weak acid such as citric acid or acetic acid, a particular concentration of table salt and an oxidizer. By using this lixiviant, the copper found in the printed circuit board reacts to form copper salts and gold becomes detached. Importantly this recovery method of copper and gold found in waste PCBs is fast, does not pose environmental hazards and is economically feasible.

The present disclosure concerns a Gas-Assisted Microbubble Extraction (GAME) system with an innovative dispersion module that can be used to efficiently separate and purify base metals and rare earth elements from various sources. The GAME system utilizes a three phase system of a gas phase, an organic phase, and an aqueous phase to efficiently extract low concentration metals from a solution.

A system for recovering precious metals includes a rotatable drum, recyclable materials, and a separating solution. The rotatable drum is configured to receive recyclable materials. The recyclable materials include non-metallic materials and electronic components, with one or both of the non-metallic materials and the electronic components having attached thereto one or both of base metals and precious metals. The separating solution is disposed in the rotatable drum and is configured to separate the base metals and the precious metals from the electronic components and the non-metallic materials and to separate the electronic components from the non-metallic materials. The rotatable drum is configured to agitate the recyclable materials and to wash the recyclable materials with the separating solution. The electronic components, non-metallic materials, base metals, and precious metals are each separately removable from the separating solution.

A process for recycling and reusing supported Pd membranes includes the separation of the Pd (or Pd alloy) layer from the support by contacting the Pd membrane with hydrogen under pressure and at low temperature and then with a second gas that is different from hydrogen. The Pd layer separated from the support can then be treated to solubilize the Pd and, where appropriate, the alloy metal(s) to obtain salts that can be reused, for example in the preparation of new Pd membranes. The recovered supports are also reusable.