Abstract

The present invention is a sulfuric acid production apparatus provided with: a conduit 41 through which a starting material comprising at least a sulfur component is supplied; a conduit 45 through which a first cooling medium is introduced; a combustion furnace 51 in which the starting material is combusted to produce a combustion gas containing a sulfur oxide; a waste heat boiler 52 in which the combustion gas is cooled by the heat exchange with the temperature-risen first cooling medium; a converter 61 in which the sulfur oxide is oxidized with a catalyst to produce a reaction gas comprising sulfur trioxide and water; a cooling device 62 in which the reaction gas is cooled by the heat exchange with a second cooling medium; a dilute sulfuric acid column 71 in which sulfur trioxide and water contained in the cooled reaction gas are absorbed by an aqueous sulfuric acid solution to produce dilute sulfuric acid and from which an exhaust gas comprising sulfur dioxide and oxygen is discharged; and a heat exchange means 63 for preparing the temperature-risen first cooling medium and the cooled second cooling medium by the heat exchange between the temperature-risen second cooling medium and the first cooling medium and supplying either one of the temperature-risen first cooling medium or the cooled second cooling medium to the waste heat boiler 52.

IPC Classes  ?

• C01B 17/74 - Preparation
• B01J 23/22 - Vanadium
• C01B 17/76 - Preparation by contact processes
• C01B 17/765 - Multi-stage SO3-conversion
• C01B 17/79 - Preparation by contact processes characterised by the catalyst used containing vanadium
• C01B 17/80 - Apparatus

Abstract

33) by oxidizing the sulfur oxide (SOx) using a catalyst; and a dilute sulfuric acid column 71 for generating a dilute sulfuric acid by cooling the reaction gas.

IPC Classes  ?

• C01B 17/80 - Apparatus
• C01B 17/74 - Preparation
• C01B 17/765 - Multi-stage SO3-conversion
• C01B 17/79 - Preparation by contact processes characterised by the catalyst used containing vanadium
• C01C 1/24 - Sulfates of ammonium

Abstract

33); and a dilute sulfuric acid tower 71 for cooling the reaction gas so as to produce dilute sulfuric acid. The apparatus produces less than 90 wt% of dilute sulfuric acid using only moisture in raw materials and without adding water between at least the combustion furnace 51 and the sulfuric acid tower 71.

IPC Classes  ?

• C01B 17/80 - Apparatus
• C01B 17/74 - Preparation
• C01B 17/765 - Multi-stage SO3-conversion
• C01B 17/79 - Preparation by contact processes characterised by the catalyst used containing vanadium
• C01C 1/24 - Sulfates of ammonium

Abstract

This production method comprises: an alkali extraction step (step 12) for obtaining an alkaline leachate by adding an alkali and water or an alkaline solution to raw material ash, which contains ammonium sulfate, sulfuric acid, vanadium, and at least one other metal selected from among nickel, iron, and magnesium, until a pH of 13 or higher is reached; a solid-liquid separation step (step 13) for separating the alkaline leachate into solid and liquid phases to obtain a vanadium-containing leached filtrate; an evaporation/concentration step (step 14) for evaporating and concentrating the leached filtrate to obtain a concentrate; and a crystallization/solid-liquid separation step (step 15) for cooling the concentrate to cause crystallization and recovering a vanadium compound-containing precipitate. The other production method comprises: an alkali extraction step (step 32); a solid-liquid separation step (step 4); an evaporation/concentration step (step 36); an alkali concentration adjustment step (step 37) for obtaining a concentration-adjusted solution by further adding an alkali or an alkali solution to the concentrate; and a crystallization/solid-liquid separation step (step 38).

IPC Classes  ?

• C01G 31/00 - Compounds of vanadium
• B09B 3/00 - Destroying solid waste or transforming solid waste into something useful or harmless
• C22B 3/12 - Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions
• C22B 34/22 - Obtaining vanadium
• H01M 8/02 - Fuel cellsManufacture thereof Details
• H01M 8/18 - Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells

Abstract

The present invention is characterized by comprising: an acid leaching step for obtaining a leach liquid by causing leaching of, by means of an acid, a metal mixture at least containing vanadium and at least one type of a divalent or trivalent metal selected from nickel, cobalt, manganese, palladium, platinum, copper, and zinc; a complex generation step for adding an ammoniacal alkaline aqueous solution to the leach liquid for adjusting the pH to 10-12 and generating, in the alkaline aqueous solution, an ammine complex of a divalent or trivalent metal ion and an anion complex of a tetravalent and/or pentavalent vanadium ion; a divalent or trivalent metal recovery step for adding a carrier having a carboxyl group to the alkaline aqueous solution in which the ammine complex and the anion complex are generated, causing the divalent or trivalent metal ion in the ammine complex to be selectively adsorbed onto the carrier, and recovering the divalent or trivalent metal ion; and a vanadium recovery step for recovering vanadium from the anion complex contained in the alkaline aqueous solution after the divalent or trivalent metal ion is recovered.

IPC Classes  ?

• C22B 34/00 - Obtaining refractory metals
• C22B 34/22 - Obtaining vanadium
• C22B 3/24 - Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means by adsorption on solid substances, e.g. by extraction with solid resins
• C22B 3/44 - Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
• C22B 3/06 - Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions
• H01M 8/18 - Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells

Abstract

The present invention is characterized by comprising: an acid leaching step for obtaining a leach liquid by causing leaching of, by means of an acid, a metal mixture at least containing vanadium and at least one type of a divalent or trivalent metal selected from nickel, cobalt, manganese, palladium, platinum, copper, and zinc; a complex generation step for adding an ammoniacal alkaline aqueous solution to the leach liquid for adjusting the pH to 10-12 and generating, in the alkaline aqueous solution, an ammine complex of a divalent or trivalent metal ion and an anion complex of a tetravalent and/or pentavalent vanadium ion; a divalent or trivalent metal recovery step for adding a carrier having a carboxyl group to the alkaline aqueous solution in which the ammine complex and the anion complex are generated, causing the divalent or trivalent metal ion in the ammine complex to be selectively adsorbed by the carrier, and recovering the divalent or trivalent metal ion; and a vanadium recovery step for recovering vanadium from the anion complex contained in the alkaline aqueous solution after the divalent or trivalent metal ion is recovered.

IPC Classes  ?

• C22B 34/22 - Obtaining vanadium
• C22B 3/24 - Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means by adsorption on solid substances, e.g. by extraction with solid resins
• C22B 3/44 - Treatment or purification of solutions, e.g. obtained by leaching by chemical processes