摘要:
The present invention refers to a process for preparing nanoparticles of tungsten, tungsten compounds, titanium, vanadium or tantalum through recycling of products of heavy-metal alloys, hard-metal alloys, tungsten comprising material and/or hard-metal comprising material, the nanoparticles of tungsten, tungsten compounds, titanium, vanadium or tantalum obtained by this process and a plastic comprising the nanoparticles of tungsten, tungsten compounds, titanium, vanadium or tantalum.
摘要:
In general, according to one approach, a recycling method is provided. The method includes dispersing (S1) an electrode containing a niobium titanium oxide in water; separating (S2) the niobium titanium oxide from the electrode dispersed in the water; and applying (S3) a first heat treatment to the separated niobium titanium oxide.
摘要:
The present invention relates to a method for producing tantalum powder for capacitors by reducing tantalum oxide with an alkaline earth metal. The method comprises the steps of: (1) mixing tantalum oxide with an excessive alkaline earth metal reducing agent, simultaneously mixing at least one alkali metal and/or alkaline earth metal halide accounting for 10-200% of the weight of the tantalum oxide, heating the obtained mixture to a temperature of 700-1200°C in a heating furnace filled with an inert gas, and soaking for 1-10 h, so that the tantalum oxide and the reducing agent are subjected to a sufficient reduction reaction; (2) at the end of soaking, lowering the temperature to 600-800°C, vacuumizing the interior of the heating furnace to 10 Pa or less, soaking under the negative pressure for 1-10 h, so that the excessive magnesium and the tantalum powder mixture are separated; (3) thereafter, raising the temperature of the heating furnace to 750-1200°C, preferably 900-1050°C, in the presence of an inert gas, and soaking for 1-6 h, so that the tantalum powder is further sintered in the molten salt; (4) then cooling to room temperature and passivating to obtain a mixed material containing halide and tantalum powder; (5) separating the tantalum powder from the resulting mixture.
摘要:
The invention relates to a method for treating a residue obtained from the titanium chloride process, wherein the residue comprises the components titanium dioxide, coke, an inert metal oxide, and an iron-containing component. Further, the invention refers to the use of this method to separate the components contained in said residue, and to the use of the separated components in the chloride process for obtaining titanium dioxide.
摘要:
[Problem] The purpose of the present invention is to provide a method for liquefying niobium and tantalum and a method for producing a niobium solution and a tantalum solution, which can liquefy niobium and tantalum or produce a niobium solution and a tantalum solution safely and efficiently from a smelting raw material containing niobium and tantalum. [Solution] Ammonium hydrogen sulfate is mixed as a reaction agent into a powdered substance containing at least one element of niobium or tantalum, and the mixture is melted under predetermined conditions to form a molten substance. A suspension formed by dissolving the molten substance having been solidified in an aqueous solution is subjected to solid-liquid separation to recover a precipitate. The precipitate is composed of niobium and/or tantalum with few impurities, and the precipitate is dissolved in one type of acid solution selected from hydrochloric acid, sulfuric acid, or nitric acid, whereby 90% or more of niobium and/or tantalum can be leached out.
摘要:
Die Erfindung betrifft ein Verfahren zur Abtrennung von werthaltigen Metallchloriden, insbesondere Titantetrachlorid und Niobpentachlorid, aus festen Rückständen, die bei der Chlorierung von Eisen-Titan-haltigen Rohstoffen im Rahmen der Titandioxidherstellung (Chloridverfahren) anfallen und beruht auf dem Prinzip der Verdampfung bzw. Sublimierung und der Resublimierung der Metallchloride. Die festen Rückstände werden zunächst erhitzt und die anhaftenden werthaltigen Metallchloride verdampft bzw. sublimiert. Hierbei können Temperatur und Druck bzw. Partialdruck so eingestellt werden, dass eine weitgehend selektive Verdampfung der werthaltigen Metallchloride erfolgt. Anschließend werden die verdampften/sublimierten Metallchloride mit einem trockenen und chemisch inerten Trägergas zu einer Kühlvorrichtung transportiert und auf den gekühlten Oberflächen durch Resublimation abgeschieden. Die Abscheidung kann vorzugsweise ebenfalls selektiv erfolgen und orientiert sich dann beispielsweise an den Dampfdruckkurven der reinen Stoffe.