Method for manufacturing nickel powder, and method for operating reaction facility

Abstract

A method for manufacturing nickel powder whereby a reduction in production efficiency due to abrasion of a flash vessel connected to a pressurized container can be suppressed when nickel powder is generated using the pressurized container and subsequently recovered. The method for manufacturing nickel powder comprises charging a pressurized container with a nickel sulfate ammine complex solution and seed crystals, adding hydrogen gas to the pressurized container, and reducing the nickel included in the nickel sulfate ammine complex solution, wherein, when a nickel powder slurry obtained in the pressurized container is extracted to a flash vessel connected to the pressurized container, the slurry is extracted to the flash vessel while the supply rate of the nickel ammine complex solution to the pressurized container and/or the extraction rate of the nickel slurry from the pressurized container is controlled so the liquid level in the pressurized container is in a fixed range.

1 . A method for manufacturing nickel powder, the method comprising: charging a nickel sulfate ammine complex solution and seed crystals in a pressurized container; adding hydrogen gas to the pressurized container; and reducing nickel included in the nickel sulfate ammine complex solution to manufacture nickel powder, wherein
 when a slurry containing the nickel powder obtained in the pressurized container is extracted to a flash vessel connected to the pressurized container,   the slurry is extracted to the flash vessel while a supply rate of the nickel ammine complex solution to the pressurized container and/or an extraction rate of the slurry from the pressurized container is controlled so that a liquid volume in the pressurized container is in a fixed range.   
     
     
         2 . The method for manufacturing nickel powder according to  claim 1 , wherein reduction reaction is performed in the pressurized container by using nickel powder with a particle size of 0.1 μm to 300 μm as the seed crystals and controlling a pressure in the pressurized container to a range of 2.5 MPa to 3.5 MPa and a temperature to a range of 150° C. to 185° C. 
     
     
         3 . The method for manufacturing nickel powder according to  claim 1 , wherein the nickel powder is recovered by solid-liquid separation in the flash vessel after the slurry containing the nickel powder reaches ordinary pressure and 100° C. or lower. 
     
     
         4 . The method for manufacturing nickel powder according to  claim 1 , wherein the flash vessel has a structure in which an acid-resistant brick is pasted to an inner surface. 
     
     
         5 . The method for manufacturing nickel powder according to  claim 1 , wherein, when the slurry containing the nickel powder is extracted to the flash vessel, a certain amount of the slurry is caused to remain in the flash vessel. 
     
     
         6 . A method for operating a reaction facility used in a method for manufacturing nickel powder, the manufacturing method including: charging a nickel sulfate ammine complex solution and seed crystals in a pressurized container; adding hydrogen gas to the pressurized container; and reducing nickel included in the nickel sulfate ammine complex solution, wherein
 the reaction facility includes:   the pressurized container; and   a flash vessel connected to the pressurized container, extracting a slurry containing the nickel powder obtained in the pressurized container, and reducing the slurry in pressure, and   when the slurry is extracted from the pressurized container to the flash vessel,   the slurry is extracted to the flash vessel while a supply rate of the nickel ammine complex solution to the pressurized container and/or an extraction rate of the slurry from the pressurized container is controlled so that a liquid volume in the pressurized container is in a fixed range.   
     
     
         7 . The method for manufacturing nickel powder according to  claim 2 , wherein the nickel powder is recovered by solid-liquid separation in the flash vessel after the slurry containing the nickel powder reaches ordinary pressure and 100° C. or lower. 
     
     
         8 . The method for manufacturing nickel powder according to  claim 2 , wherein the flash vessel has a structure in which an acid-resistant brick is pasted to an inner surface. 
     
     
         9 . The method for manufacturing nickel powder according to  claim 3 , wherein the flash vessel has a structure in which an acid-resistant brick is pasted to an inner surface. 
     
     
         10 . The method for manufacturing nickel powder according to  claim 7 , wherein the flash vessel has a structure in which an acid-resistant brick is pasted to an inner surface. 
     
     
         11 . The method for manufacturing nickel powder according to  claim 2 , wherein, when the slurry containing the nickel powder is extracted to the flash vessel, a certain amount of the slurry is caused to remain in the flash vessel. 
     
     
         12 . The method for manufacturing nickel powder according to  claim 3 , wherein, when the slurry containing the nickel powder is extracted to the flash vessel, a certain amount of the slurry is caused to remain in the flash vessel. 
     
     
         13 . The method for manufacturing nickel powder according to  claim 4 , wherein, when the slurry containing the nickel powder is extracted to the flash vessel, a certain amount of the slurry is caused to remain in the flash vessel. 
     
     
         14 . The method for manufacturing nickel powder according to  claim 7 , wherein, when the slurry containing the nickel powder is extracted to the flash vessel, a certain amount of the slurry is caused to remain in the flash vessel. 
     
     
         15 . The method for manufacturing nickel powder according to  claim 8 , wherein, when the slurry containing the nickel powder is extracted to the flash vessel, a certain amount of the slurry is caused to remain in the flash vessel. 
     
     
         16 . The method for manufacturing nickel powder according to  claim 9 , wherein, when the slurry containing the nickel powder is extracted to the flash vessel, a certain amount of the slurry is caused to remain in the flash vessel. 
     
     
         17 . The method for manufacturing nickel powder according to  claim 10 , wherein, when the slurry containing the nickel powder is extracted to the flash vessel, a certain amount of the slurry is caused to remain in the flash vessel.