36 results about "Perrhenate" patented technology

There is provided a hydrometallurgical process of recovering rhenium values from mixtures thereof with other metal values in which the rhenium values constitute a minority amount, for example super-alloys, which comprises subjecting the mixture to strongly oxidizing acid conditions, preferably an aqueous mixture of hydrochloric acid and nitric acid, so as to form perrhenate species of at least the major proportion of the rhenium values in the mixture, dissolving the perrhenate species and other soluble metal species in aqueous solution, removing insoluble metal species from the aqueous solution, and isolating the rhenium species from the solution.

Processes and systems for recovering promoter-containing compounds, for example, perrhenates, from promoter-containing catalyst substrates, for example, substrates containing precious metals, such as silver, are disclosed. The processes include contacting the substrates with a first solution adapted to remove at least some of the catalyst promoter from the substrates, for example, an oxidizing agent, to produce a second solution containing catalyst promoter, passing the second solution through a porous medium adapted to capture at least some of the catalyst promoter, for example, a ion exchange resin; and passing a third solution, for example, a base solution, through the porous medium to remove at least some of the catalyst promoter from the porous medium and produce a fourth solution containing compounds having a catalyst promoter. Systems adapted to practice these processes are also disclosed.

A method of comprehensively recovering rhenium and copper from copper smelting waste acid is disclosed. The method includes subjecting the copper smelting waste acid after being filtered to remove lead to targeted rhenium settling to obtain rhenium-rich slag, subjecting the rhenium-rich slag to hot-press oxidation leaching to obtain a rhenium-rich leachate, evaporating and concentrating to make the rhenium concentration 10-20 g / L, performing rhenium settling with KCl, and recrystallizing to obtain potassium perrhenate, and subjecting the liquid after rhenium settling to sulfuration copper settling. The objective of the method is to overcome complex processes, long treatment time, low recovery rates, and other disadvantages of processes recovering rhenium and copper from copper smelting waste acid through leaching at present, and to form a process which is low in investment, simple in operation, high in recovery rate, low in cost, low in pollution and convenient for industrial popularization and application, thus achieving high-value utilization of the rhenium resource in the copper smelting waste acid.

The invention discloses a formula of an acid plating solution for a rhenium iridium alloy coating on surface of a glass die and a preparation method thereof. The formula of the acid plating solution is characterized by comprising of 0.001-0.5mol / L of perrhenate, 0.001-0.45mol / L of sodium hexabromoiridate, 0.001-0.25mol / L of chloriridium acid hydrate, 0.001-0.95mol / L of oxalic acid treated as a complex or (and) 0.001-0.95mol / L of citric acid treated as the complex, and additives, wherein the additives include one or a plurality of 0.001-0.035mol / L of sulfuric acid, 0.001-0.045mol / L of nitrous acid, 0.001-0.020mol / L of hydrofluoric acid, and 0.001-0.015mol / L of hydrogen bromide. The preparation method comprises the steps of dissolving all the above-mentioned components in deionized water; adding 1.0-3.0mol / L of sodium hydroxide or 1.0-3.0mol / L of ammonium hydroxide solution to regulate the pH of electrolyze to be 1.5-6.5; and then electrolytically depositing a rhenium iridium alloy coating on the surface of a conductive die workpiece electrode through constant current or pulse, wherein the rhenium iridium alloy coating contains 1-85at% of iridium, the thickness of the coating is 1nm-100 microns, and the current efficiency is up to 50-90%, so that the amorphous or (and) nanocrystalline rhenium iridium alloy coating is obtained. The amorphous or (and) nanocrystalline rhenium iridium alloy coating is uniform in component distribution, high in combination intensity, outstanding in corrosion resistance, high in hardness, high in oxidation resistance, high in mechanical stability,resistant to abrasion, resistant to high temperature and releasability. Therefore, the service life of the glass die can be effectively prolonged.