Ferromagnetic-particle manufacturing apparatus

Abstract

A ferromagnetic-particle manufacturing apparatus includes: a single mode cavity that resonates with a microwave of a predetermined wavelength; a microwave oscillator electrically connected to the single mode cavity and configured to introduce the microwave of a predetermined wavelength into the single mode cavity; a pipe disposed to pass through an inside of the single mode cavity, the pipe being formed of a dielectric material; a pump configured to introduce, from one end of the pipe, an alkaline reaction liquid containing metal ions of a ferromagnetic metal; an impedance measuring device configured to measure an impedance of the single mode cavity; and a pump-flowrate deciding unit configured to decide, based on a measurement result of the impedance measuring device, a pump flowrate by which the impedance of the single mode cavity becomes a predetermined value or more; wherein the pump is configured to introduce the reaction liquid at the pump flowrate decided by the pump-flowrate deciding unit; and wherein ferromagnetic particles are generated by reacting the reaction liquid.

1 . A ferromagnetic-particle manufacturing apparatus comprising:
 a single mode cavity that resonates with a microwave of a predetermined wavelength;   a microwave oscillator electrically connected to the single mode cavity and configured to introduce the microwave of a predetermined wavelength into the single mode cavity;   a pipe disposed to pass through an inside of the single mode cavity, the pipe being formed of a dielectric material; and   a pump configured to introduce, from one end of the pipe, an alkaline reaction liquid in which metal ions of a ferromagnetic metal and hydroxide ions are dissolved;   wherein ferromagnetic particles are generated by reacting the reaction liquid.   
     
     
         2 . The ferromagnetic-particle manufacturing apparatus according to  claim 1 , further comprising:
 an impedance measuring device configured to measure an impedance of the single mode cavity; and   a pump-flowrate deciding unit configured to decide, based on a measurement result of the impedance measuring device, a pump flowrate by which the impedance of the single mode cavity becomes a predetermined value or more;   wherein the pump is configured to introduce the reaction liquid at the pump flowrate decided by the pump-flowrate deciding unit.   
     
     
         3 . The ferromagnetic-particle manufacturing apparatus according to  claim 1 , wherein
 an axial length of the pipe is 20 mm to 200 mm.   
     
     
         4 . A ferromagnetic-particle manufacturing apparatus comprising:
 an induction heating coil;   a radiofrequency power source electrically connected to the induction heating coil and configured to form an alternating field inside the induction heating coil;   a pipe disposed to pass through the inside of the induction heating coil, in which at least a partial area of the pipe in an axial direction thereof is formed of a dielectric material and an area, which is nearer to one end of the pipe than the area formed of a dielectric material, is formed of a conductive material; and   a pump configured to introduce, from the one end of the pipe, an alkaline reaction liquid in which metal ions of a ferromagnetic metal and hydroxide ions are dissolved;   wherein ferromagnetic particles are generated by reacting the reaction liquid.   
     
     
         5 . The ferromagnetic-particle manufacturing apparatus according to  claim 4 , further comprising:
 an impedance measuring device configured to measure an impedance of the induction heating coil; and   a pump-flowrate deciding unit configured to decide, based on a measurement result of the impedance measuring device, a pump flowrate by which the impedance of the induction heating coil becomes a predetermined value or more;   wherein the pump is configured to introduce the reaction liquid at the pump flowrate decided by the pump-flowrate deciding unit.   
     
     
         6 . The ferromagnetic-particle manufacturing apparatus according to  claim 4 , wherein
 an axial length of the area of the pipe, which is formed of a conductive material, is 20 mm to 200 mm.   
     
     
         7 . The ferromagnetic-particle manufacturing apparatus according to  claim 1 , wherein
 the metal ions of the ferromagnetic metal are either or both of iron ions and nickel ions.   
     
     
         8 . The ferromagnetic-particle manufacturing apparatus according to  claim 1 , wherein
 sodium hydroxide is dissolved in the reaction liquid.   
     
     
         9 . The ferromagnetic-particle manufacturing apparatus according to  claim 1 , wherein
 an internal diameter of the pipe is 0.3 mm to 5.0 mm.   
     
     
         10 . The ferromagnetic-particle manufacturing apparatus according to  claim 1 , wherein
 an inner surface of the pipe is treated with a corrosion protective covering.   
     
     
         11 . (canceled) 
     
     
         12 . (canceled) 
     
     
         13 . The ferromagnetic-particle manufacturing apparatus according to  claim 4 , wherein
 the metal ions of the ferromagnetic metal are either or both of iron ions and nickel ions.   
     
     
         14 . The ferromagnetic-particle manufacturing apparatus according to  claim 4 , wherein
 sodium hydroxide is dissolved in the reaction liquid.   
     
     
         15 . The ferromagnetic-particle manufacturing apparatus according to  claim 4 , wherein
 an internal diameter of the pipe is 0.3 mm to 5.0 mm.   
     
     
         16 . The ferromagnetic-particle manufacturing apparatus according to  claim 4 , wherein
 an inner surface of the pipe is treated with a corrosion protective covering.