Abstract: A process for recovery of vanadium dissolved in acid solutions or liquors by precipitating it out as vanadium pentoxide. Separation is carried out by adding calcium hydroxide, quicklime or calcium carbonate to the acid solution or liquor, producing a precipitate of vanadium pentoxide, which is separated from the liquid by physical methods such as filtration or centrifugation. If the acid is other than sulfuric acid, the calcium which remains dissolved in the solution or liquor by the addition of calcium hydroxide, quicklime or calcium carbonate, is removed by adding sulfuric acid, to produce solid calcium sulfate and water. The calcium sulfate is extracted from the solution or liquor or liquor by filtration or centrifugation. With sulfuric acid solution or liquors, after addition of the neutralizing agent, a solid precipitate of vanadium pentoxide and calcium sulfate is formed, which is then separated from the solution or liquor.

Abstract: A chemical process that recovers the vanadium contained in inorganic acid solutions, precipitating it as a solid compound of vanadium and alkali metal or monovalent cation ferrocyanide, is disclosed. Separation is carried out electrochemically, depositing the compound onto a metal immersed in the acid solution that contains vanadium as well as other dissolved metals, to which a ferrocyanide salt of an alkali metal or a monovalent cation has been previously added. If the inorganic acid present in solution is different than nitric acid, the vanadium can also be separated by direct addition of a ferrocyanide salt of an alkali metal or a monovalent cation to the acid solution containing vanadium. The method described allows recovery of vanadium without modifying the initial composition of the solution, except for the concentration of the vanadium dissolved.

Abstract: A chemical process that recovers the vanadium contained in inorganic acid solutions, precipitating it as a solid compound of vanadium and alkaline metal or monovalent cation ferrocyanide is disclosed. Separation is carried out electrochemically, depositing the compound on to a metal immersed in the acid solution that contains vanadium as well as other dissolved metals, to which a ferrocyanide salt of an alkaline metal or a monovalent cation has been previously added. If the inorganic acid present in solution is different from nitric acid, the vanadium can be also separated by direct addition of a ferrocyanide salt of an alkaline metal or a monovalent cation to the acid solution containing vanadium. The method described allows recovery of vanadium without modifying the initial composition of the solution, except for the concentration of the vanadium dissolved.

Abstract: A process for recovery of vanadium dissolved in acid solutions or liquors by precipitating it out as vanadium pentoxide. Separation is carried out by adding calcium hydroxide, quicklime or calcium carbonate to the acid solution or liquor, producing a precipitate of vanadium pentoxide, which is separated from the liquid by physical methods such as filtration or centrifugation. If the acid is other than sulfuric acid, the calcium which remains dissolved in the solution or liquor by the addition of calcium hydroxide, quicklime or calcium carbonate, is removed by adding sulfuric acid, to produce solid calcium sulfate and water. The calcium sulfate is extracted from the solution or liquor or liquor by filtration or centrifugation. With sulfuric acid solution or liquors, after addition of the neutralizing agent, a solid precipitate of vanadium pentoxide and calcium sulfate is formed, which is then separated from the solution or liquor.

Abstract: A process for recovery of vanadium dissolved in acid solution or liquors by precipitating it out as vanadium pentoxide. Separation is carried out by adding calcium hydroxide, quicklime or calcium carbonate to the acid solution or liquor, producing a precipitate of vanadium pentoxide, which is separated from the liquid by physical methods such as filtration or centrifugation. If the acid is other than sulfuric acid, the calcium which remains dissolved in the solution or liquor by the addition of calcium hydroxide, quicklime or calcium carbonate, is removed by adding sulfuric acid, to produce solid calcium sulfate and water. The calcium sulfate is extracted from the solution or liquor or liquor by filtration or centrifugation. With sulfuric acid solution or liquors, after addition of the neutralizing agent, a solid precipitate of vanadium pentoxide and calcium sulfate is formed, which is then separated from the solution or liquor.

Abstract: A process for recovering vanadium contained in inorganic acid solutions by precipitating the vanadium as a solid compound of vanadium and alkali metal or monovalent cation ferricyanide. Separation is carried out electrochemically by depositing the compound on to a metal immersed in the acid solution that contains vanadium, to which a ferricyanide salt of an alkali metal or a monovalent cation has been added. If the inorganic acid present in solution is different from nitric acid, the vanadium can be also separated by direct addition of a ferricyanide salt of an alkali metal or a monovalent cation to the acid solution containing vanadium. The method described allows recovery of vanadium without modifying the initial composition of the solution, except for the concentration of the vanadium dissolved.

Abstract: An electrocatalytic process for the partial oxidation of methane employs an electrocatalyst in the form of a deposit catalyst comprising an electrode having a conducting catalyst layer deposited thereon. The catalyst comprises an element selected from the group consisting of Group IB metals, Group VIB metals, Group VIII metals and mixtures thereof.