JP5887178B2 - Spheroidized particle manufacturing apparatus and spheroidized particle manufacturing method - Google Patents

Description

  The present invention relates to a spheroidized particle manufacturing apparatus and a spheroidized particle manufacturing method for manufacturing spheroidized particles.

Conventionally, various methods are known as methods for producing spheroidized particles of inorganic oxides, but the flame method is widely used industrially from the viewpoint of productivity and economy.
In the flame method, raw material powder is introduced into a flame formed by jetting fuel gas and combustion-supporting gas (supporting gas) from a burner, and the raw material powder is melted or semi-melted in a high-temperature atmosphere of the flame. In this method, spherical particles are obtained by spheroidizing the powder surface by surface tension (see, for example, Patent Documents 1 to 3).

  FIG. 5 is an enlarged cross-sectional view of the tip of the spheroidizing particle manufacturing burner disclosed in Patent Document 3, and FIG. 6 is a plan view of the tip of the spheroidizing particle manufacturing burner shown in FIG.

Here, with reference to FIG.5 and FIG.6, the structure of the conventional spheroidized particle manufacturing burner 100 is demonstrated.
A conventional burner 100 for producing spherical particles is a fuel composed of a raw material powder supply path 101 for supplying a raw material powder conveyed to a carrier gas and a plurality of supply paths arranged on the outer circumference of the raw material powder supply path 101. A gas supply path 102, a swirl oxygen supply path 103 composed of a plurality of supply paths disposed on the outer circumference of the fuel gas supply path 102, and a plurality of swirl oxygen supply paths disposed on the outer circumference of the swirl oxygen supply path 103 A straight oxygen supply passage 104, a cooling water passage 105a, 105b disposed on the outer circumference of the straight oxygen supply passage 104, and a combustion chamber 106 having a diameter expanded toward the tip side.

At the front end of the raw material powder supply path 101, a raw material powder jet 107 including a plurality of jets formed at the bottom 108 of the combustion chamber 106 is provided. Further, a fuel gas outlet 109 is provided at the tip of each supply path of the fuel gas supply path 102.
At the tip of each supply path of the swirl oxygen supply path 103, a swirl oxygen jet port 110 is provided. Further, a straight oxygen outlet 111 is provided at the tip of each supply path of the straight oxygen supply path 104.

FIG. 7 is a diagram showing a schematic configuration of a conventional spheroidized particle manufacturing apparatus disclosed in Patent Document 3. As shown in FIG.
Here, a conventional spheroidized particle manufacturing apparatus 120 will be described with reference to FIG.
A conventional spheroidized particle production apparatus 120 includes a raw material feeder 121, a carrier gas supply path 123, a burner 124, an oxygen supply facility 126, an LPG supply facility 127, a spheronization furnace 128, an air supply path 131, It has a cyclone 132 and a bag filter 133. The tip of the burner 124 that forms a flame is accommodated in the spheroidizing furnace 128. That is, a flame is formed in the spheroidizing furnace 128.

  In the conventional spheroidized particle manufacturing apparatus 120 configured as described above, the raw material powder is cut out from the raw material feeder 121, and the raw material powder is transferred to the burner 124 along with the carrier gas supplied from the carrier gas supply path 123. The

The burner 124 is supplied with oxygen from the oxygen supply facility 126 and is also supplied with combustion gas from the LPG supply facility 127, and the raw material powder passes through the flame formed in the spheroidizing furnace 128. Thus, spheroidized particles are generated.
Thereafter, the spheroidized particles are temperature-diluted by the air introduced into the bottom of the spheroidizing furnace 128 via the air supply path 131 and collected by the cyclone 132 and the bag filter 133 arranged in the subsequent stage.
Further, as the fuel gas, a gas mainly composed of methane or propane is used.

In addition to this, a spray pyrolysis method that produces spherical particles by spraying a solution containing the components of the generated powder as a mist into a high-temperature heating furnace and thermally decomposing it as a technology for producing spherical powder using a flame. (For example, see Patent Documents 4 and 5).
By using the spray pyrolysis method and adjusting the composition of the raw material solution to the composition of the target product powder, the target metal powder and composite oxide powder can be obtained.

JP 58-145613 A Japanese Patent No. 3331491 Japanese Patent No. 3322228 Japanese Patent No. 4359667 Japanese Patent No. 4619907

Incidentally, the methods described in Patent Documents 1 to 3 have no problem in the case of melting and spheroidizing fine particles of oxide such as silica (SiO ₂ ) and alumina (Al ₂ O ₃ ). When spheroidizing is attempted, since the raw material powder is oxidized by oxygen, carbon dioxide, and water vapor present in the flame during the melting process, spheroidized oxide particles are generated. It was.

Even the same oxide powder is composed of elements having different melting points such as glass (BO—BaO—CaO—ZnO) and positive electrode active materials used in Li ion batteries (for example, LiCoO ₂ and LiMn ₂ O ₄ ). When the composite oxide is used as the raw material powder, the low boiling point element volatilizes preferentially, and there is a problem that spheroidized particles having a composition different from that of the raw material powder are generated.

Further, in the spray pyrolysis methods disclosed in Patent Documents 4 and 5, there is a possibility that the flame directly contacts the raw material mist and the generated powder.
In this case, as in the case where the above-mentioned powder is put into a flame, there is a problem that a predetermined composition cannot be obtained because oxidation of the produced spheroidized particles and low boiling point elements volatilize preferentially. .
In addition, when a fuel gas mainly composed of methane or propane is used for the formation of a flame, the method of directly feeding the raw material into the flame as described in these patent documents is caused by unburned fuel in the flame. There is a problem that carbon adheres to or mixes in the spheroidized particles that are the product.

  Therefore, the present invention suppresses the contact of the flame with the raw material solution and the generated spheroidized particles to oxidize the generated spheroidized particles, volatilize the low boiling point element in the compound, and to the spheroidized particles. It is an object of the present invention to provide a spheroidized particle manufacturing apparatus and a spheroidized particle manufacturing method capable of suppressing carbon adhesion and mixing.

In order to solve the above-described problem, according to the invention according to claim 1, the raw material solution is pyrolyzed to generate spheroidized particles, and the raw material solution is provided at the upper end of the spheroidizing furnace. a spray nozzle for spraying, provided on the outside of the side wall of the spherical furnace located between the bottom of the top and the spherical furnace of the spheroidizing furnace, the inner wall by the outer surface of the side wall of the spherical furnace A plurality of external combustion chambers that are partially formed, and a burner that is provided in each of the plurality of external combustion chambers and includes a space that is integrated with the space in the external combustion chamber inside, and that forms a flame in the space. a combustion chamber provided, before Kigai燃chamber extends through the side wall of the spheroidizing furnace so as to communicate the said spheroidizing furnace, the combustion gases generated by the burner to the spheroidizing furnace A spheroidized particle manufacturing apparatus comprising: a plurality of guiding combustion gas introduction holes; There is provided.

  Moreover, according to the invention which concerns on Claim 2, it has a control part which controls the said burner provided in the said some combustion chamber each independently, The spheroidized particle manufacturing apparatus of Claim 1 characterized by the above-mentioned. Provided.

Further, the invention according to claim 3, wherein the control unit, according to claim 2, characterized in that adjusting the amount of the combustion gas flame of the burner provided in the plurality of combustion chambers to produce The described spheroidized particle production apparatus is provided.

Further, the invention according to claim 4, a fuel supply for supplying fuel to the burner provided in the plurality of combustion chambers, combustion-supporting to the burner provided in the plurality of combustion chamber A combustion-supporting gas supply source that supplies gas; and a plurality of temperature detectors that are arranged in the spheronization furnace and detect the temperature in the vertical direction in the spheronization furnace, and the control unit includes: based on the temperature in which a plurality of temperature detectors for detecting the amount of the fuel supplied to the burner provided in the plurality of combustion chambers, and claims, characterized in that adjusting the amount of the combustion supporting gas Item 2 or 3 provides a spheroidized particle production apparatus.

  Moreover, according to the invention which concerns on Claim 5, these combustion gas introduction holes are arrange | positioned in the position spaced apart from the said flame, The spherical shape of any one of Claims 1 thru | or 4 characterized by the above-mentioned. An apparatus for producing particle is provided.

Moreover, according to the invention which concerns on Claim 6 , these combustion gas introduction holes are arrange | positioned in the circumferential direction of the said spheroidizing furnace, and the extending direction of this spheroidizing furnace, The 1st thru | or 5 characterized by the above-mentioned. Among them, the spheroidized particle production apparatus according to any one of the above is provided.

Moreover, according to the invention which concerns on Claim 7 , the extending direction of these combustion gas introduction holes is the same direction as the tangential direction of the said spheronization furnace, The 1 thru | or 6 characterized by the above-mentioned. An apparatus for producing spheroidized particles according to any one of the above items is provided.

Further, the invention according to claim 8, wherein the plurality of side walls of the outer combustion chamber is said spheroidizing furnace provided, of claims 1 to 7, characterized in that it is constituted by refractory material, An apparatus for producing spheroidized particles according to any one of the above items is provided.

Further, the invention according to claim 9, provided in a portion located at the bottom of the front Symbol sphere Joka furnace, a blowing gas inlet for introducing the blowing gas into the spherical reduction furnace, before Symbol ball Joka The part positioned at the bottom of the furnace is opposed to the blowing gas introduction part, and the spheroidized particle derivation part for deriving the spheroidized particles from the spheronization furnace, and the spheroidized particle derivation part A spheroidized particle producing apparatus according to any one of claims 1 to 8 , further comprising a spheroidized particle collecting apparatus that collects the spheroidized particles.

Further, according to the invention of claim 10 , the spheroidized particle collecting device is connected to the spheroidized particle derivation unit, and collects particles having the first particle diameter among the spheroidized particles. A cyclone that is disposed downstream of the cyclone, and a bag filter that collects particles having a second particle size smaller than the first particle size among the spheroidized particles, the cyclone and the bug The spheroidized particle manufacturing apparatus according to claim 9 , further comprising a spheroidized particle transport line that connects a filter and transports a part of the spheroidized particles to the bag filter.

Moreover, according to the invention which concerns on Claim 11 , the introduction amount of the cooling gas introduced into the spheroidized particle transportation line and the cooling gas inlet which introduces cooling gas into the spheroidized particle transportation line is adjusted. The apparatus for producing spheroidized particles according to claim 10 , further comprising a cooling gas adjusting unit.

Further, the invention according to claim 12, of claims 1 to 11, a spheroidized particle production method using spherical particles production apparatus according to any one, in said plurality of outer combustion chamber is There is provided a method for producing spheroidized particles, wherein the produced combustion gas is introduced into the spheroidizing furnace, and the raw material solution is pyrolyzed with the combustion gas to produce spheroidized particles.

Further, the invention according to claim 13, wherein the combustion gas, the method of the spherical particles produced according to claim 12, wherein the generating by causing complete combustion of the fuel and combustion-supporting gas by the burner Is provided.

Further, the invention according to claim 14, the raw material solution is thermally decomposed, so that the temperature distribution suitable for generating the spherical particles is formed in the spheroidizing furnace, said plurality of combustion 14. The method for producing spheroidized particles according to claim 13, wherein the amount of the fuel supplied to the burner provided in the chamber and the amount of the combustion-supporting gas are independently controlled.

Further, the invention according to claim 15, so that the temperature of the vertical direction of the spheroidizing furnace becomes uniform, the amount of the fuel supplied to the burner provided in the plurality of combustion chambers and said The method for producing spheroidized particles according to claim 14 , wherein the amount of the combustion-supporting gas is independently controlled.

According to the onset bright, a raw material solution by pyrolysis, a spheroidization furnace to produce spherical particles, provided at the upper end of the spherical furnace, a spray nozzle for spraying a raw material solution, the upper end of the spherical furnace And provided on the outside of the side wall of the spheroidizing furnace located between the bottom of the spheroidizing furnace, a plurality of external combustion chambers exposing the outer surface of the side wall of the spheronizing furnace, and a plurality of external combustion chambers, A combustion chamber having a space integrated with the space in the outer combustion chamber on the inside, a burner provided in the combustion chamber and forming a flame in the combustion chamber, and a side wall of the spheroidizing furnace from which the outer combustion chamber is exposed. A plurality of combustion gas introduction holes for introducing the combustion gas generated by the burner into the spheronization furnace, so that the burner can sufficiently supply the fuel gas in the space in the outer combustion chamber provided outside the spheronization furnace. To produce combustion gas that contains almost no unburned fuel gas. It is possible to become.

As a result, a combustion gas containing almost no unburned fuel gas is supplied into the spheroidizing furnace through a plurality of combustion gas introduction holes, and the raw material dispersed in the spheroidizing furnace in the spheroidizing furnace by the combustion gas. Since the solution can be pyrolyzed to produce spheroidized particles, the amount of carbon adhering to the spheroidized particles can be reduced as compared with the conventional case.
Further, by not directly contacting the raw material solution and the flame, it is possible to suppress the generated spheroidized particles from being oxidized and to suppress the preferential volatilization of low boiling point elements (to obtain a predetermined composition). Can do that.)

It is a schematic diagram which shows schematic structure of the spheroidized particle manufacturing apparatus which concerns on embodiment of this invention. It is sectional drawing of the spheroidizing furnace shown in FIG. 1, a raw material spray nozzle, an external combustion chamber, a combustion chamber, and the burner provided in this combustion chamber. It is sectional drawing to which the raw material spray nozzle shown in FIG. 2 was expanded. It is sectional drawing of the X direction of the outer combustion chamber shown in FIG. 1, a combustion chamber, and the burner provided in this combustion chamber. It is sectional drawing to which the front-end | tip part of the spheroidized particle manufacturing burner disclosed by patent document 3 was expanded. It is a top view of the front-end | tip of the burner for spheroidized particle manufacture shown in FIG. It is a figure which shows schematic structure of the conventional spheroidized particle manufacturing apparatus disclosed by patent document 3. FIG.

  Embodiments to which the present invention is applied will be described below in detail with reference to the drawings. The drawings used in the following description are for explaining the configuration of the embodiment of the present invention, and the size, thickness, dimension, etc. of each part shown in the figure are the dimensional relationship of an actual spheroidized particle manufacturing apparatus. May be different.

(Embodiment)
FIG. 1 is a schematic diagram showing a schematic configuration of a spheroidized particle manufacturing apparatus according to an embodiment of the present invention. In FIG. 1, the Y direction indicates the extending direction (vertical direction) of the spheroidizing furnace 18, and the X direction indicates a surface direction orthogonal to the Y direction.

  Referring to FIG. 1, the spheroidized particle manufacturing apparatus 10 of the present embodiment includes a spray gas supply source 11, a spray gas supply line 11 </ b> A, valves 12, 14 and 16, and a combustion-supporting gas supply source. 13, a fuel-supporting gas supply line 13A, a fuel gas supply source 15 (fuel supply source), a fuel gas supply line 15A, a raw material solution tank 17, a raw material solution supply line 17A, a spheronization furnace 18, and a raw material Spray nozzle 19, outer combustion chambers 21 to 25, combustion chambers 21 </ b> A and 21 </ b> B, burners 31 to 40, combustion gas introduction holes 45 to 49, combustion-supporting gas flow rate adjustment valves 51 to 60 (combustion-supporting gas) For adjusting the flow rate of the fuel gas), the fuel gas flow rate adjusting valves 61 to 70 (the valve for adjusting the flow rate of the fuel gas), the temperature detectors 75 to 80, the control unit 82, and the blowing gas introduction unit. 84, spheroidized particle outlet 85, blower blow With a 87, an air inlet 88, a spheroidized particle transport line 89, a spheroidized particle collection device 91, the.

The atomizing gas supply source 11 is connected to the atomizing gas supply line 11A. The spray gas supply source 11 is connected to the raw material spray nozzle 19 in a state in which the spray gas can be supplied to the raw material spray nozzle 19 via the spray gas supply line 11A. As the atomizing gas, for example, oxygen or oxygen-enriched air can be used.
The valve 12 is provided in the atomizing gas supply line 11A. By opening the valve 12, the atomizing gas is supplied to the raw material spray nozzle 19.

The combustion-supporting gas supply source 13 is connected to the combustion-supporting gas supply line 13A. The combustion-supporting gas supply source 13 supplies combustion-supporting gas to the burners 31 to 40 via a branch line branched from the combustion-supporting gas supply line 13A. As the combustion-supporting gas, for example, oxygen or oxygen-enriched air can be used.
The valve 14 is provided in the combustion-supporting gas supply line 13A. By opening the valve 14, the combustion-supporting gas is supplied from the combustion-supporting gas supply line 13A to the branch line.

The fuel gas supply source 15 is connected to a fuel gas supply line 15A. The fuel gas supply source 15 supplies fuel gas to the burners 31 to 40 through a branch line branched from the fuel gas supply line 15A. As the fuel gas, for example, LPG (Liquid Petroleum Gas) mainly containing butane (CH ₃ —CH ₂ —CH ₂ —CH ₃ ), propane (C ₃ H ₈ ), or the like can be used.
The valve 16 is provided in the fuel gas supply line 15A. By opening the valve 16, the fuel gas is supplied from the fuel gas supply line 15A to the branch line.
In the present embodiment, the case where fuel gas is used as fuel will be described as an example. However, liquid fuel may be used instead of fuel gas.

The raw material solution tank 17 is connected to a raw material solution supply line 17A. A nitrogen gas line (not shown) for pressurizing the raw material solution tank 17 is connected to the raw material solution tank 17.
By pressurizing the raw material solution tank 17 with nitrogen gas, the raw material solution is supplied to the raw material spray nozzle 19 via the raw material solution supply line 17A.

  2 is a sectional view of the spheroidizing furnace, raw material spray nozzle, outer combustion chamber, combustion chamber, and burner provided in the combustion chamber shown in FIG. 1, and FIG. 3 shows the raw material spray nozzle shown in FIG. It is expanded sectional drawing.

1 and 2, the spheroidizing furnace 18 is a vertical furnace extending in the Y direction (vertical direction). The spheroidizing furnace 18 can be, for example, cylindrical. In the present embodiment, the following description will be given by taking as an example the case where the spheroidizing furnace 18 has a cylindrical shape.
The spheroidizing furnace 18 is a raw material solution supplied from the upper end 18A of the spheroidizing furnace 18 through the raw material spray nozzle 19 by the combustion gas generated in the combustion chambers 21 to 25 and introduced into the spheroidizing furnace 18. Spheroidized particles are generated by thermally decomposing.

Of the side wall 18C of the spheroidizing furnace 18, at least a portion where the outer combustion chambers 21 to 25 are exposed may be formed of a refractory material (for example, a brick or an indeterminate castable).
Thereby, it can suppress that the side wall 18C of the spheronization furnace 18 is damaged by the flame which the burners 31-40 form. In addition, you may comprise the whole side wall 18C of the spheroidizing furnace 18 with the said refractory.

  Although not shown, a water cooling jacket for cooling the side wall 18C of the spheroidizing furnace 18 may be provided. Thereby, it can suppress that a raw material solution adheres to the inner surface of the side wall 18C of the spheroidizing furnace 18.

FIG. 3 is an enlarged cross-sectional view of the raw material spray nozzle shown in FIG.
1 to 3, the raw material spray nozzle 19 is connected to the spray gas supply line 11 </ b> A, the raw material solution supply line 17 </ b> A, and the upper end 18 </ b> A (top) of the spheronization furnace 18.
The raw material spray nozzle 19 includes a raw material liquid supply unit 19A, a spray gas supply unit 19B, a cooling water supply unit 19C, and a spray raw material ejection hole 19D.
The raw material liquid supply unit 19 </ b> A has a cylindrical shape and extends in the same direction as the spheroidizing furnace 18. The raw material liquid supply unit 19A has a raw material liquid supply port 19A-1 connected to the raw material solution supply line 17A at its upper end.

The spray gas supply unit 19B is arranged so as to surround the outer wall of the raw material liquid supply unit 19A in a state of being separated from the raw material liquid supply unit 19A. Thereby, a space capable of supplying the spray gas is formed between the raw material liquid supply unit 19A and the spray gas supply unit 19B.
The spray gas supply unit 19B includes the space and a spray gas supply port 19B-1 connected to the spray gas supply line 11A.

The cooling water supply unit 19C is disposed so as to surround the lower outer wall of the spray gas supply unit 19B in a state of being separated from the spray gas supply unit 19B. Thereby, a space in which cooling water can flow is formed between the spray gas supply unit 19B and the cooling water supply unit 19C.
The cooling water supply unit 19C has a cooling water inlet 19C-1 and a cooling water outlet 19C-2 connected to the space. The cooling water inlet 19C-1 is connected to a cooling water supply source (not shown). Further, the cooling water outlet 19C-2 is connected to a cooling water recovery unit (not shown).

The spray raw material ejection hole 19D is arranged at a position facing the lower end of the raw material liquid supply part 19A. The spray raw material ejection hole 19D is configured by the inner wall of the spray gas supply unit 19B.
The spraying raw material ejection hole 19 </ b> D is a hole for spraying the raw material solution supplied via the raw material solution supply line 17 </ b> A to the upper end 18 </ b> A side of the spheroidizing furnace 18.

The outer combustion chambers 21 to 25 are provided outside the side wall 18 </ b> C of the spheronization furnace 18 located between the upper end 18 </ b> A of the spheronization furnace 18 and the bottom 18 </ b> B of the spheronization furnace 18.
The outer combustion chamber 21 is disposed on the upper end 18 </ b> A side of the spheroidizing furnace 18. The external combustion chamber 21 is an external combustion chamber arranged in the uppermost layer among the external combustion chambers 21 to 25. The outer combustion chamber 21 has a ring-shaped space C that exposes the outer surface 18 a of the side wall 18 C of the spheroidizing furnace 18 in the circumferential direction of the spheroidizing furnace 18.

The combustion chambers 21 </ b> A and 21 </ b> B are provided in the outer combustion chamber 21. The combustion chambers 21 </ b> A and 21 </ b> B are provided in the outer combustion chamber 21. The combustion chambers 21 </ b> A and 21 </ b> B have a space integrated with the space C in the outer combustion chamber 21 inside thereof. The flame of the burner 31 is accommodated in the space in the combustion chamber 21A, and the flame of the burner 32 is accommodated in the space in the combustion chamber 21B.
The combustion chambers 21A and 21B configured as described above are also provided in the outer combustion chambers 22 to 25, respectively.

  The external combustion chambers 22 to 25 have the same configuration as the external combustion chamber 21. That is, the outer combustion chambers 22 to 25 have a space C that exposes the outer surface 18a of the side wall 18C of the spheroidizing furnace 18 in the circumferential direction of the spheroidizing furnace 18.

  The external combustion chamber 22 is disposed immediately below the external combustion chamber 21. The external combustion chamber 23 is disposed immediately below the external combustion chamber 22. The outer combustion chamber 24 is disposed immediately below the outer combustion chamber 23. The outer combustion chamber 25 is disposed immediately below the outer combustion chamber 24. The external combustion chamber 25 is an external combustion chamber arranged in the lowest layer among the external combustion chambers 21 to 25.

  In the present embodiment, the case where five outer combustion chambers 21 to 25 are arranged in the vertical direction has been described as an example, but the number of outer combustion chambers can be appropriately selected as necessary. It is not limited to this. That is, the number of external combustion chambers should just be two or more.

FIG. 4 is a cross-sectional view in the X direction of the outer combustion chamber, the combustion chamber, and the burner provided in the combustion chamber shown in FIG.
Referring to FIGS. 2 and 4, the burner 31 is provided in the combustion chamber 21 </ b> A so that the tip that forms the flame is accommodated in the combustion chamber 21 </ b> A provided in the outer combustion chamber 21. The burner 31 branches from the combustion-supporting gas supply line 13 </ b> A and is connected to the combustion-supporting gas supply source 13 through a branch line provided with a combustion-supporting gas flow rate adjustment valve 51.
The burner 31 branches from the fuel gas supply line 15 </ b> A and is connected to the fuel gas supply source 15 through a branch line provided with a fuel gas flow rate adjustment valve 61.

  The burner 32 is provided in the combustion chamber 21 </ b> B so that a tip that forms a flame is accommodated in the combustion chamber 21 </ b> B provided in the outer combustion chamber 21. Thereby, the burners 31 and 32 are arranged to face each other via the spheroidizing furnace 18. The burner 32 branches from the combustion-supporting gas supply line 13 </ b> A and is connected to the combustion-supporting gas supply source 13 through a branch line provided with a combustion-supporting gas flow rate adjustment valve 52.

The burner 32 branches from the fuel gas supply line 15 </ b> A, and is connected to the fuel gas supply source 15 through a branch line provided with a fuel gas flow rate adjustment valve 62.
The burners 31 and 32 generate combustion gas containing almost no unburned fuel gas in the space C in the outer combustion chamber 21 by completely burning the fuel gas (fuel) and the combustion-supporting gas.

Referring to FIG. 2, the burner 33 is provided in the combustion chamber 21 </ b> A so that a tip that forms a flame is accommodated in the combustion chamber 21 </ b> A provided in the outer combustion chamber 22. The burner 33 branches from the combustion-supporting gas supply line 13 </ b> A and is connected to the combustion-supporting gas supply source 13 via a branch line provided with a combustion-supporting gas flow rate adjustment valve 53.
The burner 33 is branched from the fuel gas supply line 15 </ b> A, and is connected to the fuel gas supply source 15 via a branch line provided with a fuel gas flow rate adjustment valve 63.

  The burner 34 is provided in the combustion chamber 21 </ b> B so as to be accommodated in the combustion chamber 21 </ b> B provided in the outer combustion chamber 22. Thereby, the burners 33 and 34 are arranged to face each other via the spheroidizing furnace 18. The burner 34 branches from the combustion-supporting gas supply line 13 </ b> A and is connected to the combustion-supporting gas supply source 13 through a branch line provided with a combustion-supporting gas flow rate adjustment valve 54.

The burner 34 is branched from the fuel gas supply line 15 </ b> A and is connected to the fuel gas supply source 15 via a branch line provided with a fuel gas flow rate adjustment valve 64.
The burners 33, 34 generate combustion gas containing almost no unburned fuel gas in the space C in the outer combustion chamber 22 by completely burning the fuel gas (fuel) and the combustion-supporting gas.

The burner 35 is provided in the combustion chamber 21 </ b> A so as to be accommodated in the combustion chamber 21 </ b> A provided in the outer combustion chamber 23. The burner 35 branches from the combustion-supporting gas supply line 13 </ b> A, and is connected to the combustion-supporting gas supply source 13 through a branch line provided with a combustion-supporting gas flow rate adjustment valve 55.
The burner 35 branches from the fuel gas supply line 15 </ b> A and is connected to the fuel gas supply source 15 via a branch line provided with a fuel gas flow rate adjustment valve 65.

  The burner 36 is provided in the combustion chamber 21 </ b> B so as to be accommodated in the combustion chamber 21 </ b> B provided in the outer combustion chamber 23. Thereby, the burners 35 and 36 are arranged to face each other via the spheroidizing furnace 18. The burner 36 branches from the combustion-supporting gas supply line 13A and is connected to the combustion-supporting gas supply source 13 via a branch line provided with a combustion-supporting gas flow rate adjustment valve 56.

The burner 36 branches from the fuel gas supply line 15A and is connected to the fuel gas supply source 15 via a branch line provided with a fuel gas flow rate adjustment valve 66.
The burners 35 and 36 generate combustion gas containing almost no unburned fuel gas in the space C in the outer combustion chamber 23 by completely burning the fuel gas (fuel) and the combustion-supporting gas.

The burner 37 is provided in the combustion chamber 21 </ b> A so as to be accommodated in the combustion chamber 21 </ b> A provided in the outer combustion chamber 24. The burner 37 branches from the combustion-supporting gas supply line 13 </ b> A, and is connected to the combustion-supporting gas supply source 13 via a branch line provided with a combustion-supporting gas flow rate adjustment valve 57.
The burner 37 is branched from the fuel gas supply line 15 </ b> A, and is connected to the fuel gas supply source 15 through a branch line provided with a fuel gas flow rate adjustment valve 67.

  The burner 38 is provided in the combustion chamber 21 </ b> B so as to be accommodated in the combustion chamber 21 </ b> B provided in the outer combustion chamber 24. Thereby, the burners 37 and 38 are arranged to face each other via the spheroidizing furnace 18. The burner 38 branches from the combustion-supporting gas supply line 13A and is connected to the combustion-supporting gas supply source 13 via a branch line provided with a combustion-supporting gas flow rate adjustment valve 58.

The burner 38 is branched from the fuel gas supply line 15A and is connected to the fuel gas supply source 15 via a branch line provided with a fuel gas flow rate adjustment valve 68.
The burners 37 and 38 generate combustion gas containing almost no unburned fuel gas in the space C in the outer combustion chamber 24 by completely burning the fuel gas (fuel) and the combustion-supporting gas.

The burner 39 is provided in the combustion chamber 21 </ b> A so as to be accommodated in the combustion chamber 21 </ b> A provided in the outer combustion chamber 25. The burner 39 branches from the combustion-supporting gas supply line 13 </ b> A and is connected to the combustion-supporting gas supply source 13 through a branch line provided with a combustion-supporting gas flow rate adjustment valve 59.
The burner 39 branches from the fuel gas supply line 15 </ b> A and is connected to the fuel gas supply source 15 via a branch line provided with a fuel gas flow rate adjustment valve 69.

  The burner 40 is provided in the combustion chamber 21 </ b> B so as to be accommodated in the combustion chamber 21 </ b> B provided in the outer combustion chamber 25. Thereby, the burners 39 and 40 are arranged to face each other via the spheroidizing furnace 18. The burner 40 branches from the combustion-supporting gas supply line 13 </ b> A and is connected to the combustion-supporting gas supply source 13 via a branch line provided with a combustion-supporting gas flow rate adjustment valve 60.

The burner 40 branches from the fuel gas supply line 15A and is connected to the fuel gas supply source 15 via a branch line provided with a fuel gas flow rate adjustment valve 70.
The burners 39 and 40 generate combustion gas containing almost no unburned fuel gas in the space C in the outer combustion chamber 25 by completely burning the fuel gas (fuel) and the combustion-supporting gas.

For example, the burners 31 to 40 can have the same configuration (in other words, burners having the same configuration are used). In this case, as the burners 31 to 40, for example, a premix type burner is preferable if soot mixing is suppressed, but if it is desired to avoid the risk of flashback, a diffusion combustion type burner may be used. Is possible.
In addition, you may combine various kinds of burners as needed.

  Moreover, the quantity of the combustion gas which the flame of the burners 31-40 produces | generates is adjusted with the flow volume of fuel gas, and the flow volume of combustion support gas. Further, the flow rate of the combustion-supporting gas is the same as or more than the amount necessary for complete combustion of the fuel gas.

Referring to FIGS. 2 and 4, a plurality of combustion gas introduction holes 45 (four in the case of the present embodiment) are provided so as to penetrate the outer wall 18C of the spheroidizing furnace 18 where the space C of the outer combustion chamber 21 is exposed. ) Is provided.
A plurality (four in this embodiment) of the combustion gas introduction holes 46 are provided so as to penetrate the outer wall 18C of the spheroidizing furnace 18 where the space C of the outer combustion chamber 22 is exposed.
A plurality (four in the case of this embodiment) of the combustion gas introduction holes 47 are provided so as to penetrate the outer wall 18C of the spheroidizing furnace 18 in which the space C of the outer combustion chamber 23 is exposed.

A plurality (four in the present embodiment) of the combustion gas introduction holes 48 are provided so as to penetrate the outer wall 18C of the spheroidizing furnace 18 in which the space C of the outer combustion chamber 24 is exposed.
A plurality (four in this embodiment) of the combustion gas introduction holes 49 are provided so as to penetrate the outer wall 18C of the spheroidizing furnace 18 in which the space C of the outer combustion chamber 25 is exposed.

The combustion gas introduction holes 45 to 49 are holes for introducing the combustion gas generated in the outer combustion chamber 21 into the spheroidizing furnace 18.
The combustion gas introduction holes 45 to 49 are arranged at a predetermined interval with respect to the circumferential direction of the spheronization furnace 18 so that the extending direction thereof is the same as the tangential direction of the spheronization furnace 18.

Thus, by making the extending direction of the plurality of combustion gas introduction holes 45 to 49 for supplying the combustion gas into the spheroidizing furnace 18 the same as the tangential direction of the spheroidizing furnace 18, A strong swirling flow can be generated by the supplied combustion gas.
Thereby, when the raw material solution sprayed from the raw material spray nozzle 19 is thermally decomposed, combustion gas can be efficiently sprayed on the generated spheroidized particles, and the generated spheroidized particles adhere to the inner wall of the spheroidizing furnace 18. Can be suppressed.

Further, the plurality of combustion gas introduction holes 45 to 49 are arranged at positions separated from the flame formed by the burners 31 to 40.
As described above, by providing the plurality of combustion gas introduction holes 45 to 49 at positions separated from the flame formed by the burners 31 to 40, the plurality of combustion gas introduction holes 45 to 49 are formed by the burners 31 to 40. Compared with the case where it is provided in the vicinity, introduction of unburned fuel gas into the spheroidizing furnace 18 can be suppressed.

2 and 4, as an example, the case where four combustion gas introduction holes 45 to 49 are provided in the circumferential direction of the spheronization furnace 18 is described as an example. The number of the combustion gas introduction holes 45 to 49 to be arranged is not limited to this.
In FIG. 2, as an example of the combustion gas introduction holes 45 to 49, the case where the combustion gas introduction holes 45 to 49 are provided only in the circumferential direction of the spheroidizing furnace 18 is described as an example. You may provide the holes 45-49 in the circumferential direction of the spheroidizing furnace 18, and the extending direction (vertical direction) of the spheroidizing furnace 18, respectively.

  Thus, the outer surface 18a of the side wall 18C of the spheroidizing furnace 18 is exposed to the outside of the side wall 18C of the spheroidizing furnace 18 located between the upper end 18A of the spheroidizing furnace 18 and the bottom 18B of the spheroidizing furnace 18. And the external combustion chambers 21-25 arranged with respect to the extending direction (vertical direction) of the spheroidizing furnace 18, and the space C of the external combustion chambers 21-25 provided inside the external combustion chambers 21-25. Combustion chambers 21A and 21B having spaces integrated with each other, burners 31 to 40 provided in the combustion chambers 21A and 21B and forming a flame in the combustion chambers 21A and 21B, and the outer combustion chambers 21 to 25 are exposed. Combustion gas introduction holes 45 to 49 that pass through the side wall 18C of the spheroidizing furnace 18 and guide the combustion gas generated by the burners 31 to 40 into the spheroidizing furnace 18 are provided outside the spheroidizing furnace 18. In the space C of the outer combustion chambers 21 to 25 provided The fuel gas is sufficiently burned, it is possible to produce a combustion gas containing almost no unburned fuel gas by the burner 31 to 40 Te.

  Thereby, the sprayed raw material solution is thermally decomposed by the combustion gas containing almost no unburned fuel gas introduced into the spheroidizing furnace 18 through the combustion gas introduction holes 45 to 49, and the spheroidized particles are obtained. As a result, it is possible to reduce the amount of carbon adhering to and mixing into the spheroidized particles.

  Referring to FIG. 2, the temperature detectors 75 to 80 detect the temperature in the spheroidizing furnace 18 in the vertical direction below the inner surface 18 b (reference plane) of the wall constituting the upper end of the spheroidizing furnace 18. 75, temperature detector 76, temperature detector 77, temperature detector 78, temperature detector 79, and temperature detector 80 are arranged in this order.

  Specifically, for example, the temperature detector 75 is disposed at a position 100 mm from the inner surface 18 b, the temperature detector 76 is disposed at a position 300 mm from the inner surface 18 b, and the temperature detector 77 is disposed at a position 600 mm from the inner surface 18 b. The temperature detector 78 can be disposed at a position 900 mm from the inner surface 18b, the temperature detector 79 can be disposed at a position 1200 mm from the inner surface 18b, and the temperature detector 80 can be disposed at a position 1450 mm from the inner surface 18b.

  The temperature detectors 75 to 80 are each electrically connected to the control unit 82. The temperature detectors 75 to 80 transmit the detected temperatures in the spheroidizing furnace 18 to the control unit 82. As the temperature detectors 75 to 80, for example, an R thermocouple (a high temperature thermocouple capable of detecting up to a temperature of about 1600 ° C.) can be used.

  In FIG. 2, the case where six temperature detectors are provided has been described as an example, but the number of temperature detectors is not limited to this. Further, the installation positions of the temperature detectors 75 to 80 in the spheroidizing furnace 18 are not limited to the positions of the temperature detectors 75 to 80 shown in FIG. 2, but a place that does not interfere with the generation of the spheroidized particles is preferable. .

Referring to FIG. 1, the control unit 82 is electrically connected to the temperature detectors 75 to 80 in a state in which data regarding the temperature in the spheroidizing furnace 18 detected by the temperature detectors 75 to 80 can be received. Yes.
In addition, the control unit 82 can control the combustion-supporting gas flow rate adjustment valves 51 to 60 and the fuel gas flow-control valve 61 to 70, and can control the combustion-supporting gas flow rate adjustment valves 51 to 60 and the fuel gas flow rate adjustment valve 61. Electrically connected to .about.70.

  Based on the temperature detected by the temperature detectors 75 to 80, the control unit 82 has a temperature distribution in the spheroidizing furnace 18 according to the characteristics of the raw material powder to be melted (for example, the vertical distribution in the spheroidizing furnace 18). The opening degree of the combustion-supporting gas flow rate adjustment valves 51 to 60 and the fuel gas flow rate adjustment valves 61 to 70 is adjusted so that the temperature in the direction is uniform), and the inside of the spheroidizing furnace 18 is changed from the outer combustion chambers 21 to 25. The amount of combustion gas introduced into the is adjusted.

  As described above, the temperature detectors 75 to 80 for detecting the temperature in the vertical direction in the spheroidizing furnace 18 and the combustion-supporting gas flow rate adjusting valve 51 to adjust the amount of the combustion-supporting gas supplied to the burners 31 to 40. 60, fuel gas flow rate adjustment valves 61 to 70 for adjusting the amount of fuel gas supplied to the burners 31 to 40, temperature detectors 75 to 80, combustion-supporting gas flow rate adjustment valves 51 to 60, and fuel gas flow rate adjustment And the control unit 82 electrically connected to the valves 61 to 70, and based on the temperature detected by the temperature detectors 75 to 80, the control unit 82 uses the combustion-supporting gas flow rate adjustment valves 51 to 60 and Since the amount of combustion gas introduced into the spheroidizing furnace 18 from the outer combustion chambers 21 to 25 can be adjusted by controlling the fuel gas flow rate adjusting valves 61 to 70, the vertical direction in the spheroidizing furnace 18 can be adjusted. Temperature variation of the That.

  By the way, in the spheroidized particle manufacturing apparatus 10 of the present embodiment, the outer combustion chambers 21 to 25 arranged in the vertical direction of the spheronization furnace 18 and the combustion chambers 21A and 21B provided in the outer combustion chambers 21 to 25 are provided. And the burner 31 to 40 disposed, so that the combustion-supporting gas flow rate adjustment valves 51 to 60, the fuel gas flow rate adjustment valves 61 to 70 provided in the spheroidized particle manufacturing apparatus 10 shown in FIGS. Even when the temperature detectors 75 to 80 and the control unit 82 are excluded from the constituent elements, the difference between the lower temperature in the spheroidizing furnace 18 and the upper temperature of the spheroidizing furnace 18 can be reduced.

The blown gas introduction portion 84 is provided at the bottom portion 18 </ b> B of the spheroidizing furnace 18. The blown gas introduction unit 84 is connected to the blower blower 87 and introduces the air sent from the blower blower 87 into the bottom 18 </ b> B of the spheroidizing furnace 18.
The spheroidized particle outlet 85 is provided on the side wall 18 </ b> C of the spheronizing furnace 18 at a portion located at the bottom 18 </ b> B of the spheronizing furnace 18 so as to face the blowing gas introduction part 84. The spheroidized particle derivation unit 85 derives the spheroidized particles from the spheroidizing furnace 18 by the air sent from the blower blower 87. The blower blower 87 is for supplying air to the blown gas introduction part 84.

The cooling gas inlet 88 is connected to the upper end of the cyclone 95. The cooling gas inlet 88 is an inlet for introducing a cooling gas (for example, air) into the spheroidized particle transport line 89 via the upper end of the cyclone 95.
Further, a blower (not shown) is provided at the rear stage of the bag filter 96, and the cooling gas is introduced from the cooling gas introduction port 88 by being sucked by the blower.

A filter (not shown) and a cooling gas adjusting unit (not shown) are provided at the cooling gas inlet 88. The cooling gas adjustment unit is for adjusting the amount of cooling gas introduced into the spheroidized particle transport line 89. As the cooling gas adjusting unit, for example, a damper can be used.
As described above, by using the damper as the cooling gas adjusting unit, the amount of the cooling gas introduced into the spheroidized particle transport line 89 can be adjusted by adjusting the angle of the damper.

Further, by adjusting the amount of air introduced from the blower 87 and the amount of cooling gas introduced from the cooling gas introduction port 88 to change the amount of air introduced into the cyclone 95, the spherical shape collected by the cyclone 95 and the bag filter 96 is collected. The particle size distribution of the particles can be changed.
Moreover, the particle size of the spheroidized particles collected by the cyclone 95 can be reduced by increasing the amount of air blown from the blower blower 87 and increasing the flow velocity of the gas transporting the spheroidized particles.

  The spheroidized particle transport line 89 has one end connected to the upper end of the cyclone 95 and the other end connected to the bag filter 96.

The spheroidized particle collecting device 91 is a device that collects the spheroidized particles derived from the spheroidized particle deriving unit 85, and includes a cyclone 95 and a bag filter 96.
The cyclone 95 is provided on the downstream side of the spheroidizing furnace 18, and is connected to the bottom 18 </ b> B of the spheronizing furnace 18 via the spheroidizing particle outlet 85. The cyclone 95 collects the spheroidized particles having the first particle diameter among the spheroidized particles transported via the spheroidized particle outlet 85. The spheroidized particles having the first particle diameter are collected from the lower end of the cyclone 95. The first particle diameter is larger than the second particle diameter described later.

  The bag filter 96 is provided on the downstream side of the cyclone 95, and is connected to the upper end of the cyclone 95 via a spheroidized particle transport line 89. The bag filter 96 collects spheroidized particles having a second particle size smaller than the first particle size.

  According to the spheroidized particle manufacturing apparatus of the present embodiment, the raw material solution is thermally decomposed to be provided in the spheroidizing furnace 18 that generates the spheroidized particles and the upper end 18A of the spheroidizing furnace 18, and the raw material solution is sprayed. The spray nozzle 19 is disposed outside the side wall 18C of the spheronization furnace 18 located between the upper end 18A of the spheronization furnace 18 and the bottom of the spheronization furnace 18, and an outer surface 18a of the side wall 18C of the spheronization furnace 18 is provided. Exposed external combustion chambers 21 to 25, external combustion chambers 21 to 25, combustion chambers 21 </ b> A and 21 </ b> B having spaces integrated with spaces C in the external combustion chambers 21 to 25, and combustion chambers 21 </ b> A, The burners 31 to 40 that are provided in 21B and form flames in the combustion chambers 21A and 21B and the side walls 18C of the spheroidizing furnace 18 in which the outer combustion chambers 21 to 25 are exposed are generated by the burners 31 to 40. The combustion gas is introduced into the spheroidizing furnace 18. By having the burned gas introduction holes 45 to 49, the fuel gas is sufficiently burned by the burners 31 to 40 in the space C in the outer combustion chambers 21 to 25 provided outside the spheroidizing furnace 18, It becomes possible to generate a combustion gas containing almost no unburned fuel gas.

As a result, combustion gas containing almost no unburned fuel gas is supplied into the spheroidizing furnace 18 through the combustion gas introduction holes 45 to 49, and dispersed in the spheroidizing furnace 18 by the combustion gas in a mist form. Since the raw material solution can be pyrolyzed to produce spheroidized particles, the amount of carbon adhering to the spheroidized particles can be reduced as compared with the conventional case.
Further, by not directly contacting the raw material solution and the flame, it is possible to suppress the generated spheroidized particles from being oxidized and to suppress the preferential volatilization of low boiling point elements (to obtain a predetermined composition). Can do.)

Next, spheroidized particles are generated by the following method for the spheroidized particle manufacturing method using the spheroidized particle manufacturing apparatus 10 configured as described above.
First, the fuel gas and the combustion-supporting gas are supplied to the burners 31 to 40, and the fuel gas is completely burned in the outer combustion chambers 21 to 25, thereby generating a combustion gas containing almost no unburned fuel gas. Then, the combustion gas is introduced into the spheroidizing furnace 18 through the combustion gas introduction holes 45 to 49.

Next, the temperature detectors 75 to 80 detect the temperature in the vertical direction in the spheroidizing furnace 18, and based on the detected temperature, the controller in the vertical direction in the spheroidizing furnace 18 becomes uniform. 82, the flow rates of the combustion-supporting gas and the fuel gas supplied to the burners 31 to 40 are adjusted.
In addition, what is necessary is just to perform adjustment of the flow volume of the combustion support gas supplied to the burners 31-40 and fuel gas as needed.

  Next, the raw material solution is dispersed into the spheroidizing furnace 18 from the upper end 18 </ b> A of the spheroidizing furnace 18 through the raw material spray nozzle 19 in a state where the temperature in the vertical direction in the spheroidizing furnace 18 becomes uniform.

Thereafter, the raw material solution is thermally decomposed with the combustion gas introduced into the spheroidizing furnace 18 and having a uniform temperature in the vertical direction, thereby generating spheroidized particles.
The produced spheroidized particles are collected by a cyclone 95 and a bag filter 96 constituting the spheroidized particle collecting device 91.

  At this time, the cyclone 95 collects the spheroidized particles having the first particle size out of the spheroidized particles, and the bag filter 96 collects the second spheroidized particles that are smaller than the first particle size. The spheroidized particles having a particle size of are collected.

  According to the method for producing spheroidized particles of the present embodiment, the combustion gas existing in the outer combustion chambers 21 to 25 generated by the flames of the burners 31 to 40 is introduced into the spheronization furnace 18, and the combustion gas is used. By pyrolyzing the raw material solution to produce spheroidized particles, it becomes possible to produce spheroidized particles using combustion gas containing almost no unburned fuel gas. The amount of carbon adhering to and mixed in can be reduced.

  Further, by not directly contacting the raw material solution and the flame, it is possible to suppress the generated powder from being oxidized, and to suppress the preferential volatilization of low boiling point elements (to obtain a predetermined composition). it can.).

  Furthermore, the flow rate of the combustion-supporting gas and the fuel gas supplied to the burners 31 to 40 is adjusted so that the temperature in the vertical direction in the spheroidizing furnace 18 is uniform, and the inside of the spheroidizing furnace 18 from the outer combustion chambers 21 to 25 is adjusted. By adjusting the amount of the combustion gas introduced into the gas, the difference between the lower temperature in the spheronization furnace 18 and the upper temperature of the spheronization furnace 18 becomes as small as possible, so that the raw material solution stays in the high-temperature combustion gas. It becomes possible to lengthen the time.

  In the present embodiment, as an example, the combustion-supporting gas flow rate adjustment valves 51 to 60 and the fuel gas flow rate adjustment valves 61 to 70 are controlled so that the temperature in the vertical direction in the spheronization furnace 18 is uniform. Although the case has been described as an example, an optimum temperature distribution for thermally decomposing the raw material solution may be formed in the spheroidizing furnace 18 depending on the characteristics of the raw material solution.

  Further, the present invention independently controls the burners 31 to 40 so that the temperature distribution suitable for thermally decomposing the raw material solution is formed in the spheroidizing furnace 18, and the inside of the outer combustion chambers 21 to 25 is controlled. This method is applicable when the amount of combustion gas generated is different.

  In addition, the combustion-supporting gas flow rate adjustment valves 51 to 60, the fuel gas flow rate adjustment valves 61 to 70, the temperature detectors 75 to 80, and the control unit 82 provided in the spheroidized particle manufacturing apparatus 10 shown in FIGS. In the case of producing spheroidized particles using the spheroidized particle production apparatus from which the components are removed, the step of adjusting the flow rate of the combustion-supporting gas and the fuel gas supplied to the burners 31 to 40 by the control unit 82 is excluded. Except for the above, the spheroidized particles can be generated by the same method as the spheroidized particle manufacturing method of the present embodiment.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and within the scope of the present invention described in the claims, Various modifications and changes are possible.

  For example, in the present embodiment, a case where two burners (in other words, a pair of burners 31 and 32) and combustion chambers 21A and 21B are arranged for one outer combustion chamber 21 has been described as an example. However, four burners (in other words, two burners 31 and 32, respectively) and two combustion chambers 21A and 21B may be provided for one outer combustion chamber 21.

  This makes it possible to further increase the temperature of the combustion gas, which is particularly effective when producing spherical particles having a high melting point. In addition, the number of the burners used by this invention is not limited to FIG.2 and FIG.4.

(Example)
Lithium manganate powder (LiMn ₂ O ₄ ) was produced using the inorganic spheroidized particle production apparatus 10 shown in FIG. As the raw material solution, lithium nitrate and manganese nitrate were used, and a 1M raw material solution was prepared so that the molar ratio of Li / Mn was 0.56.

  The raw material solution was stored in the raw material solution tank 17, and the raw material solution tank 17 was pressurized with nitrogen gas, whereby the raw material solution was supplied to the raw material solution supply line 17 connecting the raw material solution tank 17 and the raw material spray nozzle 19. The raw material solution supply line 17 was provided with a flow meter and a flow rate control valve (both not shown) to adjust the supply amount of the raw material solution. Moreover, oxygen gas was used as the atomizing gas. LPG was used as the fuel, and oxygen was used as the combustion-supporting gas.

  Table 1 shows the supply amount of each fluid. In Table 1, spray gas, fuel, and combustion-supporting gas indicate flow rates when converted to standard conditions (0 ° C., 1 atm). Moreover, the supply amount supplied to one burner and the supply amount of the total amount supplied to all the burners are written together for the fuel and the combustion-supporting gas.

  Using the above conditions, lithium manganate particles were produced, Li / Mn of the lithium manganate particles was measured, and it was confirmed whether particles having a desired composition were obtained. The results are shown in Table 2.

(Comparative example)
As a comparative example, a conventional spheroidized particle production apparatus shown in FIG. 7 was used, and a burner was directly installed in the spheroidizing furnace, and the furnace was directly heated with a flame to produce lithium manganate spherical particles. The supply conditions for each fluid were the same as in Table 1.
Li / Mn of the lithium manganate particles obtained by the production method of the comparative example was measured, and it was confirmed whether or not particles having a desired composition were obtained. The results are shown in Table 2.

(Summary of evaluation results)
Referring to Table 2, the production method of the comparative example could not produce the same lithium manganate spheroidized particles as the Li / Mn composition of the raw material solution.
On the other hand, in the manufacturing method of an Example, it has confirmed that the same lithium manganate spheroidized particle could be manufactured with the composition of Li / Mn of a raw material solution.

  The present invention is applicable to a spheroidized particle manufacturing apparatus and a spheroidized particle manufacturing method using a raw material solution.

  DESCRIPTION OF SYMBOLS 10 ... Spheroidized particle manufacturing apparatus, 11 ... Spray gas supply source, 11A ... Spray gas supply line, 12, 14, 16 ... Valve, 13 ... Combustion gas supply source, 13A ... Combustion gas supply line, DESCRIPTION OF SYMBOLS 15 ... Fuel gas supply source, 15A ... Fuel gas supply line, 17 ... Raw material solution tank, 17A ... Raw material solution supply line, 18 ... Spheroidizing furnace, 18a ... Outer surface, 18b ... Inner surface, 18A ... Upper end, 18B ... Bottom surface, 18C DESCRIPTION OF SYMBOLS ... Side wall, 19 ... Raw material spray nozzle, 19A ... Raw material liquid supply part, 19A-1 ... Raw material liquid supply port, 19B ... Spray gas supply part, 19B-1 ... Spray gas supply port, 19C ... Cooling water supply part, 19C- DESCRIPTION OF SYMBOLS 1 ... Cooling water inlet, 19C-2 ... Cooling water outlet, 19D ... Spraying material injection hole, 21-25, 98 ... Outer combustion chamber, 21A ... Combustion chamber, 21B ... Combustion chamber, 21C ... Space, 31-40 ... Burner 45-4 ... Combustion gas introduction hole, 51-60 ... Combustion gas flow rate adjustment valve, 61-70 ... Fuel gas flow rate adjustment valve, 75-80 ... Temperature detector, 82 ... Control part, 84 ... Blast gas introduction part, 85 ... Spherical particle outlet, 87 ... Blower blower, 88 ... Air inlet, 89 ... Spherical particle transport line, 91 ... Spherical particle collector, 95 ... Cyclone, 96 ... Bag filter

Claims (15)

Spheroidizing furnace for generating spheroidized particles by pyrolyzing the raw material solution;
A spray nozzle provided at an upper end of the spheroidizing furnace for spraying the raw material solution;
A plurality of provided outside the side wall of the spherical furnace, part of the inner wall is formed by the outer surface of the side wall of the spheroidizing furnace located between the bottom of the top and the spherical furnace of the spherical furnace The outer combustion chamber,
A combustion chamber provided in each of the plurality of outer combustion chambers, including a space integrated with the space in the outer combustion chamber on the inside, and provided with a burner for forming a flame in the space ;
And through the side wall of the spheroidizing furnace so as to communicate the said spheroidizing furnace as before Kigai燃chamber, a plurality of combustion gas introducing hole for guiding the combustion gases generated by the burner to the spheroidizing furnace When,
An apparatus for producing spheroidized particles, comprising:   The spheroidized particle manufacturing apparatus according to claim 1, further comprising a control unit configured to independently control the burners provided in the plurality of combustion chambers. Wherein the control unit, spherical particles production apparatus according to claim 2, wherein adjusting the amount of the combustion gas flame is generated in the burner provided in the plurality of combustion chambers. A fuel supply for supplying fuel to the burner provided in the plurality of combustion chambers,
A combustion-supporting gas source for supplying a combustion-supporting gas to the burner provided in the plurality of combustion chambers,
A plurality of temperature detectors arranged in the spheronization furnace and detecting the temperature in the vertical direction in the spheronization furnace;
Have
Wherein, based on the temperature in which a plurality of temperature detectors for detecting the amount of the fuel supplied to the burner provided in the plurality of combustion chambers, and adjusting the amount of the combustion supporting gas The spheroidized particle manufacturing apparatus according to claim 2 or 3, wherein   The spheroidized particle manufacturing apparatus according to any one of claims 1 to 4, wherein the plurality of combustion gas introduction holes are arranged at positions separated from the flame. The spheroidized particles according to any one of claims 1 to 5 , wherein the plurality of combustion gas introduction holes are arranged in a circumferential direction of the spheroidizing furnace and an extending direction of the spheroidizing furnace. manufacturing device. The spheroidized particle manufacturing apparatus according to any one of claims 1 to 6 , wherein an extending direction of the plurality of combustion gas introduction holes is the same direction as a tangential direction of the spheroidizing furnace. The spheroidized particle manufacturing apparatus according to any one of claims 1 to 7 , wherein a side wall of the spheroidizing furnace provided with the plurality of external combustion chambers is made of a refractory. Provided at a portion located at the bottom of the front Symbol sphere Joka furnace, a blowing gas inlet for introducing the blowing gas into the spherical reduction furnace,
The portion located on the bottom of the front Symbol sphere Joka furnace, and the blowing gas introduction portion and is opposed, and spherical particles deriving unit that derives the spherical particles from the spheronizing furnace,
A spheroidizing particle collecting device for collecting the spheroidizing particles derived from the spheroidizing particle deriving unit;
The apparatus for producing spheroidized particles according to any one of claims 1 to 8 , wherein The spheroidized particle collecting device is connected to the spheroidized particle derivation unit, and a cyclone for collecting particles having a first particle diameter among the spheroidized particles,
A bag filter that is disposed downstream of the cyclone and collects particles having a second particle diameter smaller than the first particle diameter among the spheroidized particles;
Connecting the cyclone and the bag filter, and transporting a part of the spheroidized particles to the bag filter;
The apparatus for producing spheroidized particles according to claim 9 . A cooling gas inlet for introducing a cooling gas into the spheroidized particle transport line;
A cooling gas adjusting unit for adjusting an introduction amount of the cooling gas introduced into the spheroidized particle transport line;
The spheroidized particle manufacturing apparatus according to claim 10, wherein A spheroidized particle manufacturing method using the spheroidized particle manufacturing apparatus according to any one of claims 1 to 11 ,
Introducing the combustion gas generated in the plurality of outer combustion chambers into the spheroidizing furnace, and pyrolyzing the raw material solution with the combustion gas to generate spheroidized particles, Production method. The method for producing spheroidized particles according to claim 12 , wherein the combustion gas is generated by completely burning fuel and a combustion-supporting gas by the burner. The raw material solution is thermally decomposed, so that the temperature distribution suitable for generating the spherical particles is formed in the spheroidizing furnace, the supplied to the burner provided in the plurality of combustion chamber The method for producing spheroidized particles according to claim 13, wherein the amount of fuel and the amount of the combustion-supporting gas are independently controlled. As the temperature in the vertical direction of the spheroidizing furnace becomes uniform, controlled independently of the amount of the amount and the combustion supporting gas in the fuel supplied to the burner provided in the plurality of combustion chamber The method for producing spheroidized particles according to claim 14 .

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