Abstract:
Provided are a selective recovery method of vanadium and cesium from a waste sulfuric acid vanadium catalyst by a hydrometallurgical method including water leaching, solid-liquid separation, vanadium solvent extraction, vanadium selective stripping, and cesium alum production, and a high-quality vanadium aqueous solution and cesium alum produced thereby.
Abstract:
The present disclosure relates to a process and system for recovery of one or more metal values using solution extraction techniques and to a system for metal value recovery. In an exemplary embodiment, the solution extraction system comprises a first solution extraction circuit and a second solution extraction circuit. A first metal-bearing solution is provided to the first and second circuit, and a second metal-bearing solution is provided to the first circuit. The first circuit produces a first rich electrolyte solution, which can be forwarded to primary metal value recovery, and a low-grade raffinate, which is forwarded to secondary metal value recovery. The second circuit produces a second rich electrolyte solution, which is also forwarded to primary metal value recovery. The first and second solution extraction circuits have independent organic phases and each circuit can operate independently of the other circuit.
Abstract:
A method for producing a catalyst using an additive layer method includes: (i) forming a layer of a powdered catalyst or catalyst support material, (ii) binding or fusing the powder in said layer according to a predetermined pattern, (iii) repeating (i) and (ii) layer upon layer to form a shaped unit, and (iv) optionally applying a catalytic material to said shaped unit.
Abstract:
This disclosure relates to methods for purifying and isolating astatine-211 from bismuth metal. Also disclosed are automated methods for purifying and isolating astatine-211 from bismuth metal.
Abstract:
The present invention extracts precious metals from an acidic solution containing precious metals in an early and highly efficient manner. Provided is an extraction agent for precious metals that is represented by the general formula below. In the formula, R1 and R2 each represent the same alkyl group or different alkyl groups, R3 represents a hydrogen atom or an alkyl group, and R4 represents a hydrogen atom or a discretionary group that is not an amino group and that bonds to α carbon as an amino acid. By subjecting an acidic solution containing precious metals to solvent extraction using the extraction agent for precious metals, a plurality of precious metals can be recovered all at once from a solution containing a large amount of various impurities.
Abstract:
The invention relates to a process for recovering at least one platinoid element contained in an acidic aqueous solution comprising chemical elements other than the platinoid element, the process comprising the steps of (a) bringing the acidic aqueous solution into contact with a reducing amount of a reducing agent which is a non-sulphurous and non-glucidic alcoholic compound chosen from cyclic, optionally aromatic, alcohols and aliphatic polyols, which reduces the platinoid element to its 0 oxidation state; and (b) separating the reduced platinoid element from the acidic aqueous solution.
Abstract:
The present invention has an object to provide a method and an apparatus for removing metals in waste water, such as thallium contained in waste water generated by rinsing waste containing chlorine, ash obtained by burning garbage, fly ash, etc. and reduces the concentration of metals in the waste water to a discharge standard, and the present invention provides a method for removing metals comprising applying direct-current electricity by an electrolyzer 5 to waste water S5, which contains metal aggregate, discharged via a reaction tank 1, a settler 2, and a reaction tank 4, and thereby the waste water S5 is electrolyzed together with depositing metals dissolve in the waste water S5 as metal oxides, separating the waste water containing deposited metal oxides in a precision filtration apparatus 6 into suspended solid MP and waste water S7, and removing a small amount of metals dissolve in the waste water S7 after removing the suspended solid MP in an ion exchange unit 7.
Abstract:
The present invention is directed to a method for providing an agricultural waste product having amorphous silica, carbon, and impurities; extracting from the agricultural waste product an amount of the impurities; changing the ratio of carbon to silica; and reducing the silica to a high purity silicon (e.g., to photovoltaic silicon).
Abstract:
Recovery of a metal from scrap materials or other source materials containing two or more metals or other materials by iodization of the materials or parts of them to create multiple metal iodides of respective metals, separating the iodides and dissociating at least one of the iodides to recover its metal component.