49results about "Vanadium compounds preparation" patented technology

The invention provides a system for extracting vanadium from a vanadium-chromium-silicon-containing leaching solution and preparing vanadium pentoxide and a treatment method thereof. The system sequentially includes an impurity removal system, an extraction system, a stripping vanadium precipitation system, and a washing system and calcination system. On the basis of the prior art, the system and method of the present invention have carried out careful research on elements that are easy to deposit in vanadium pentoxide products such as silicon, aluminum and chromium, and through chemical regulation and equipment strengthening, the extraction stock solution, The different polymerization states of impurities such as vanadium-chromium-silicon-aluminum in the impurity removal liquid and raffinate were quantitatively detected, combined with the structure of the extract, based on the quantitative experimental test results, the extraction mechanism of vanadium-chromium-silicon-aluminum was scientifically predicted, and Through chemical regulation and removal of impurities, strengthening of centrifugal extraction equipment and quantitative control of back extraction, a system is formed to realize the preparation of low-chromium, low-silicon, low-aluminum, high-purity vanadium pentoxide products.

The invention discloses a comprehensive utilization method of waste acids of the titanium dioxide industry, relates to a method of comprehensively utilizing and recovering waste acids of the titanium dioxide industry and directly producing sulfuric acid method titanium dioxide from non-blast furnace titanium slag, and belongs to the technical field of titanium non-acid treatment. Titanium slag generated through direct reduction of vanadium-titanium magnetite ores is taken as the raw material, neutralizing agent, and capturing agent of titanium hydrolysis and precipitation, through oxidation and hydrolysis, titanium in the waste acids of the titanium dioxide industry is precipitated and enriched in the optimized titanium slag; at the same time, rare metals such as vanadium, scandium, and the like, is extracted and dissolved in the solution so as to obtain a titanium poor solution containing rare metals such as vanadium, scandium, and the like, the titanium poor solution is extracted or subjected to ion exchange so as to recover vanadium, scandium, and the like; the optimized titanium slag is applied to titanium dioxide production through a sulfuric acid method; and the waste acids generated during the titanium dioxide production are returned and cyclically used. The problems of waste acid discharge and environmental pollution of sulfuric acid method titanium dioxide production are radically solved; and the provided method has the advantages that the titanium dioxide product quality is good, the titanium recovery rate is high, and rare elements such as vanadium, scandium, and the like, can be comprehensively recovered.

The invention relates to a method for deeply separating molybdenum and vanadium in a solution containing the molybdenum and the vanadium. The method includes: regulating the acidity [H<+>] of the solution containing the molybdenum and the vanadium to be 0.0003-10mol / L, and then using the compound of Mo(IV) or / and Mo(V) as the reducing agent to selectively reduce the vanadium in the solution to obtain liquid after reduction; regulating the pH of the liquid after reduction to be 4-7, settling the vanadium, and using an ion exchanging method or extraction method to enrich the molybdenum; or regulating the pH of the liquid after reduction to be 2-4, using an ion exchanging method or extraction method to enrich the molybdenum, then regulating the pH to 4-7, and settling the vanadium. The method has the advantages that the E<0>Mo(VI) / Mo(V) and E<0>V(V) / V(IV) potential differences under an acidic condition are utilized, the compound of Mo(IV) or / and Mo(V) as the reducing agent to selectively reduce the V(V) in the solution into V(IV), and the maximum differentiation of the properties of the molybdenum and the vanadium in the solution is achieved; the property that anion exchange resin or basic extractant can only selectively enrich the Mo(VI) in the solution and cannot absorb the V(IV) is utilized to deeply separate the molybdenum and the vanadium; the method is simple in process, short in process flow, convenient to operate, good in molybdenum-vanadium separation effect, low in treatment cost, environmental friendly, suitable for industrial application, and the like.

The invention discloses a method for preparing high-purity ammonium metavanadate from a spent catalyst, which comprises the following steps: dephosphorization: collecting a spent catalyst leach solution in a leaching mode, filtering the leach solution, sending into an ion-exchange dephosphorization system, and carrying out phosphorus adsorption on the spent catalyst leach solution by using a resin; molybdenum-vanadium separation: sending the dephosphorized molybdenum / vanadium-containing solution into an ion-exchange system, and carrying out molybdenum adsorption by using a resin to separate the molybdenum and vanadium; and vanadium precipitation: pumping the vanadium-containing mother solution subjected to dephosphorization and separation molybdenum into a vanadium precipitation tank, and precipitating vanadium by using a weakly alkaline ammonium salt to obtain the high-purity ammonium metavanadate product. The method has the characteristics of short process, simple technique, energy saving, environmental protection, high efficiency, low cost and the like.

The present invention provides a system and method for preparing high-purity vanadium pentoxide powder. Industrial grade vanadium pentoxide is converted to vanadium oxytrichloride by low temperature fluidizing chlorination, wherein chlorinating gas is preheated via heat exchange between fluidizing gas and chlorination flue gas, and an appropriate amount of air is added to enable a part of carbon powder to combust so as to achieve a balanced heat supply during the chlorination, thereby increasing the efficiency of chlorination and ensuring good selectivity in low temperature chlorination. The vanadium oxytrichloride is subjected to purification by rectification, ammonium salt precipitation and fluidized calcination, thereby obtaining high-purity vanadium pentoxide, wherein the ammonia gas produced during calcination is condensed and then recycled for ammonium salt precipitation. The system and method have advantages of favorable adaptability to raw material, less pollution, low energy consumption in production, low operation cost, stable product quality, etc.