Disclosed is a method for clean metallurgy of molybdenum, including steps: 1) roasting molybdenite with calcium to obtain calcified molybdenum calcine, and leaching the calcified molybdenum calcine with an inorganic acid to obtain a molybdenum-containing inorganic acid leachate; 2) extracting molybdenum in the leachate with a cationic extractant to obtain an organic phase loaded with molybdyl cations and a raffinate; 3) using a hydrogen peroxide solution as a stripping agent to obtain a molybdenum stripping liquor; and 4) heating the molybdenum stripping liquor to dissociate peroxymolybdic acid therein so as to form a molybdic acid precipitate, and then calcining to obtain a molybdenum trioxide product. The method solves the problem of ammonia nitrogen wastewater production and can also be used for the enrichment and recovery of rhenium.

Multistage process for the preparation of a concentrate of metals, rare metals and rare earth metals from residues of alumina production by Bayer process (red mud), or from materials with a chemical composition similar to red mud, and multistage process for separating the elements of interest, transforming them into single products to be re-used in the Bayer process and/or sending them to the respective reference markets.

The sole FIGURE appended shows the simplified block diagram of the invention, in terms of its most extensive definition.

Methods of recovering metals from metal-bearing materials, and more particularly, methods for improving leaching efficiency in extraction processes by employing a surfactant composition in the extraction process, as well as slurries useful in the methods of recovering metals are provided.

The present invention discloses a method of using a waste silicon slurry. The method includes the steps of: (A) obtaining a waste silicon slurry containing a cutting oil and a metal; (B) treating the waste silicon slurry with a first reagent for reacting with the cutting oil; (C) treating the waste silicon slurry with a second reagent for reacting with the metal; (D) separating products resulting from step (B) and step (C) to obtain a solid portion; and (E) treating the solid portion with a third reagent to obtain products, including silicates and hydrogen gas.

The present invention relates to a method for recovering at least one kind of metal selected from the group consisting of gold (Au) and palladium (Pd), the method including: an addition process of adding a metal adsorbent to a solution containing the metal; and an adsorption process of causing the metal to be adsorbed on the metal adsorbent, wherein the metal adsorbent comprises at least one selected from the group consisting of a cell and a cell-derived article of microorganism belonging to Cyanidiales, a processed article of the cell and the cell-derived article, and an artificial substance mitigating the cell, the cell-derived article, and the processed article, and wherein the solution is a nitric acid solution or a sulfuric acid solution.

A process disclosed herein is related to the isolation and purification of substantially pure chemicals, including silica gel, sodium silicate, aluminum silicate, iron oxide, and rare earth elements (or rare earth metals, REEs), from massive industrial waste coal ash. In one embodiment, the process includes a plurality of caustic extractions of coal ash at an elevated temperature, followed by an acidic treatment to dissolve aluminum silicate and REEs. The dissolved aluminum silicate is precipitated out by pH adjustment as a solid product while REEs remain in the solution. REEs are captured and enriched using an ion exchange column. Alternatively, the solution containing aluminum silicate and REEs is heated to produce silica gel, which is easily separated from the enriched REEs solution. REEs are then isolated and purified from the enriched solution to afford substantially pure individual REE by a ligand-assisted chromatography. Additionally, a simplified process using one caustic extraction and one acidic extraction with an ion exchange process was also investigated and optimized to afford a comparable efficiency.

Embodiments relate to processing materials in recycling of used solar panels. A used solar panel may comprise components manufactured from materials of high purity, that are expensive to prepare from scratch. Examples of such high purity materials can include but are not limited to: metals (silver; copper; tin; lead), photovoltaic material (e.g., precisely doped crystalline silicon; CdTe), and optically transparent materials (e.g., optical glass; plastics). Accordingly, embodiments recover one or more high purity materials from a starting material pre-processed from a used solar module, by using a recycling process comprising multiple successive separation events. Such events can include, but are not limited to: chemical separation (leaching, filtration, precipitation), physical separation (e.g., shredding/sieving), thermal separation (e.g., furnace heating), and/or electrical separation (e.g., electrowinning, electrostatic). Various fractions separated during the recycling process flow, are enriched in valuable materials and hence available for reuse at lower cost relative to materials prepared from scratch.

The present invention relates generally to a process for co-producing lithium, aluminum, and silicon-oxygen (SiO) materials, and more particularly, to a process for co-producing lithium, aluminum, and SiO materials from a hard rock source in the form of a granular concentrate of one or more lithium-containing silicate minerals including spodumene. In particular, there is provided a process for co-producing Li, Al, and SiO materials from the beta (?) crystallographic form of the Li-containing silicate mineral spodumene, which in its purest state has the composition LiAlSi.sub.2O.sub.6.

The invention provides a method for extracting transition metals, the method comprising supplying a feedstream containing transition metal, mixing the feedstream with nitric acid for a time and at a concentration sufficient to form an aqueous phase containing the transition metal, combining the aqueous phase with organic extractant phase for a time and at a concentration sufficient to cause the transition metal to reside within the organic extractant phase, and combining the transition metal-containing organic extractant phase with an hydroxamic acid-containing aqueous phase at a concentration and for a time sufficient to cause the transition metal to reside in the hydroxamic acid-containing aqueous phase.

A process and system are disclosed for recovering lithium from a lithium-containing silicate mineral. The process and system comprise mixing the silicate mineral with nitric acid. The process and system also comprise subjecting the mixture to a leaching process having conditions such that lithium values in the silicate mineral are leached from the silicate mineral as lithium nitrate. The nitric acid can be in aqueous, gaseous or precursor gaseous form.