A photoconductor containing an optional supporting substrate, a photogenerating layer, and at least one charge transport layer, and wherein the photogenerating layer contains a titanyl phthalocyanine prepared, for example, by dissolving a Type I titanyl phthalocyanine in a solution comprising a trihaloacetic acid and an alkylene halide; adding the mixture comprising the dissolved Type I titanyl phthalocyanine to a solution comprising an alcohol and an alkylene halide thereby precipitating a Type Y titanyl phthalocyanine; and treating the Type Y titanyl phthalocyanine with a monohalobenzene.

Titanyl phthalocyanine photoconductors

A method for extracting vanadium and chromium from materials containing the vanadium or/and the chromium is characterized by comprising the following steps: taking salt and alkali of alkali metal or the alkali of the alkali metal as an oxidation transformation medium of the materials containing the vanadium or/and the chromium; carrying out treating for 0.5-6 hours at the temperature of 160-600 DEG C under the effect of an oxidizing agent and enabling the vanadium and the chromium in the materials to be converted into soluble vanadate and soluble chromate; carrying out water leaching to obtain leaching liquor containing the vanadium or/and the chromium; adding a precipitant A in the leaching liquor containing the vanadium or/and the chromium to selectively precipitate the vanadium at first, and adding a precipitant B to precipitate the chromium to obtain vanadium-rich residues and chromium-rich residues; and then separating and recycling the vanadium and the chromium from the vanadium-rich residues and the chromium-rich residues respectively. The vanadium and the chromium are separated and recycled effectively, and moreover, the effect of removing impurities simultaneously is achieved; liquor obtained after chromium precipitation is subjected to oxidization regeneration, evaporated and concentrated to obtain media, and the media are returned to an oxidation transformation procedure for the materials containing the vanadium or/and the chromium and are recycled. The method has the advantages of the simple technology, easiness and convenience in operation, the good vanadium and chromium separating effect, a high metal recovery rate, low production cost, environmental friendliness and the like, and is suitable for industrial application of extracting the vanadium and the chromium from the materials containing the vanadium or/and the chromium.

Method for extracting vanadium and chromium from materials containing vanadium or/and chromium

The invention provides a purification method of a high-chrome vanadium-contained raw material. The method comprises the following steps of primary roasting, wherein the high-chrome vanadium-containedraw material is roasted at the temperature of 400 to 600 DEG C to obtain vanadium oxide; alkaline leaching, wherein alkali liquor and an oxidizing agent are used for dissolving metallurgical grade vanadium oxide, air is led for oxidation, and a first precipitating agent is added for obtaining vanadium-contained lixivium; the temperature of the vanadium-contained lixivium is kept not lower than 40DEG C, pH of a solution is adjusted to be neutral, a second precipitating agent is added for deeply removing silicon, and through pressure filtration, vanadium-contained lixivium is obtained; a thirdprecipitating agent is added for lixiviating and precipitating vanadium, and washing and suction filtration are carried out to obtain ammonium metavanadate; the third precipitating agent is an ammonium-contained solution and/or ammonium salt; the ammonium metavanadate is dried; and finished product ammonium metavanadate is roasted at the temperature of 500 to 600 DEG C, and high-purity V2O5 is prepared. According to the purification method, other reducibility impurities are prevented from being introduced in the chrome and vanadium separation process, and product quality and V2O5 purity are improved.

Purification method of high-chrome vanadium-contained raw material

Invention manuscript: the drawing page of the abstract needs to be improved; the drawing of the abstract is not specified when a system turns an archive; invention manuscript: the drawing of the abstract is specified when the system turns the archive if the invention manuscript has the drawing; and the drawing cannot be specified if the invention manuscript does not has the drawing. The inventionrelates to the technical field of vanadium recycling, and particularly discloses a process for extracting vanadium from vanadium slag. The process comprises the following steps: adding water and sodium bicarbonate into vanadium-removed slag to prepare slurry, heating, stirring, and filtering to obtain calcium carbonate filter residue and filtrate; washing the calcium carbonate filter residue withwater to obtain washing water; merging the filtrate and the washing water to obtain a conversion solution, wherein the conversion dissolution rate of the vanadium is greater than 94.29 percent; concentrating the conversion solution until the content of the vanadium is greater than 10 g/L; adding a chromic acid solution into the concentrated conversion solution, wherein the mass fraction of the chromic acid solution is greater than 200g/L; controlling the PH of the conversion solution to be 1 to 2.5; preserving the heat of the conversion solution for 1 to 2 hours at 80 to 90 DEG C, and filtering to obtain precipitate and filtrate; and drying the precipitate to obtain a vanadium-containing product with the vanadium content of greater than 91 percent. By adopting the technical scheme providedby the invention, high vanadium recycling rate of the vanadium slag in a sodium bichromate process of our company, and extremely high economic benefit is created for our company.

Process for extracting vanadium from vanadium slag

The invention discloses a method for reducing content of sodium in a vanadium-containing leaching solution and belongs to the field of metallurgy. The method for reducing the content of the sodium inthe vanadium-containing leaching solution is provided to solve the technical problems that at present, the content of the sodium in the vanadium-containing leaching solution is relatively high, consequently, the following process is long and tedious, and the purity of vanadium pentoxide is relatively low. The method for reducing the content of the sodium in the vanadium-containing leaching solution comprises the following steps that ammonium sulfate is added into the vanadium-containing leaching solution, stirring is carried out so that the ammonium sulfate can be sufficiently dissolved, the solution is cooled and separated out in a crystal manner, suction filtration is carried out, and the purified vanadium-containing leaching solution is obtained. According to the method, the ammonium sulfate is added into the vanadium-containing leaching solution, a cooling crystallization method is adopted, a great number of sodium sulfate crystals in the leaching solution are separated out, the content of the sodium in the vanadium-containing leaching solution can be effectively reduced, no vanadium is lost, the purified vanadium-containing leaching solution facilitates proceeding of the following process, and the process period of the vanadium pentoxide is shortened.

Method for reducing content of sodium in vanadium-containing leaching solution

Process wherein the vanadium present in the chromium ore chromite is recovered as vanadium pentoxide during the course of the fusion of the chromium ore with alkali and its work-up to produce sodium chromate solution and sodium dichromate.

Dawie Van Der Merre

Papers

Process for the utilization of vanadium from chromium ore as vanadium (V) oxide