JP3511180B2 - Production equipment for inorganic spheroidized particles - Google Patents
Production equipment for inorganic spheroidized particlesInfo
- Publication number
- JP3511180B2 JP3511180B2 JP03218394A JP3218394A JP3511180B2 JP 3511180 B2 JP3511180 B2 JP 3511180B2 JP 03218394 A JP03218394 A JP 03218394A JP 3218394 A JP3218394 A JP 3218394A JP 3511180 B2 JP3511180 B2 JP 3511180B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- particles
- raw material
- burner
- flame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Silicon Compounds (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、充填材等として使用さ
れる無機質球状化粒子の製造装置に関し、詳しくは、無
機質原料粉を球状化バーナーの火炎で処理して無機質球
状化粒子を製造する装置に関する。
【０００２】
【従来の技術】例えば、特開昭５８−１４５６１３号公
報等に記載されているように、二酸化ケイ素（シリカ）
等の無機質原料粉を火炎中に通すことにより無機質球状
化粒子を製造することが知られている。原料粉を火炎中
で球状化するためには高温の火炎が必要であり、通常、
酸素−ガス燃料バーナーが使用されている。
【０００３】図２は、従来の無機質球状化粒子の製造装
置の一例を示す系統図である。シリカ等の無機質原料粉
は、通常のフィーダー１から切り出され、例えば、酸素
をキャリアガスにして球状化バーナー２に搬送される。
この球状化バーナー２には、酸素供給設備３からの酸素
と、ＬＰＧ供給設備４からの燃料ガスとが供給されてお
り、炉５内の火炎中で球状化された粒子は、経路６から
炉５内に導入された空気により温度希釈され、後段のサ
イクロン７やバグフィルター８で回収される。
【０００４】
【発明が解決しようとする課題】上記のような無機質球
状化粒子の製造装置では、無機質原料粉として、通常、
ボールミル等で粉砕した広い粒度分布を有するものを使
用している。このような広い粒度分布を有する原料粉を
球状化バーナーの火炎中に投入した場合、火炎中での粒
子の挙動は、小さい粒子程、粒子速度が速いため、火炎
中での粒子の濃度が高くなると、溶融した粗粒子と微粒
子とが衝突して瘤付き粒子が発生することがあった。こ
のような瘤付き粒子は、不良品として、篩等で取り除く
必要があり、製品歩留りや生産性の点で改善が望まれて
いた。
【０００５】また、粒径の小さな原料粉が火炎中で過度
に加熱されると、蒸発して超微粉となることがあるが、
この超微粉は、後段のバグフィルターに目詰りを発生さ
せ、払い落としも困難なため、様々な不都合を生じてい
た。
【０００６】そこで本発明は、上記瘤付き粒子の発生を
防止するとともに、原料粉の過度の加熱による超微粉の
発生も防止することができる無機質球状化粒子の製造装
置を提供することを目的としている。
【０００７】
【課題を解決するための手段】上記した目的を達成する
ため、本発明の無機質球状化粒子の製造装置は、無機質
原料粉を粗粒粉と微粒粉とに分別する分離装置を設ける
とともに、分離した粗粒粉と微粒粉とをそれぞれ別個に
球状化処理する粗粒粉用球状化バーナーと微粒粉用球状
化バーナーとを設けたことを特徴としている。
【０００８】
【作 用】上記構成によれば、各球状化バーナーに供給
される無機質原料粉の粒径分布が小さくなるため、原料
粉の火炎中での速度分布も小さくなり、粒子同士の衝突
の確率が小さくなることから、瘤付き粒子の発生を抑え
ることができる。また、粒径分布に応じた火炎温度を設
定できるため、粒径の小さな原料粉が火炎中で過度に加
熱されて蒸発することによる超微粉の発生も防止でき
る。
【０００９】
【実施例】以下、本発明を、図１に示す一実施例に基づ
いてさらに詳細に説明する。図１に示す無機質球状化粒
子の製造装置は、ボールミルで粉砕したシリカ等の原料
粉を供給するフィーダー１１と、原料粉を搬送用の搬送
ガスを供給する酸素供給設備１２と、原料粉を粗粒粉と
微粒粉とに分別する分離装置としてのサイクロン１３
と、球状化炉１４に設けられた粗粒粉用球状化バーナー
１５及び微粒粉用球状化バーナー１６とを備えており、
前記球状化炉１４の後段には、生成した球状化粒子を採
取するためのサイクロンやバグフィルターが、従来と同
様に設けられている。
【００１０】なお、上記両バーナー１５，１６には、そ
れぞれ、プロパン（ＬＰＧ）等の燃料を供給する燃料供
給管２１，支燃性ガスである酸素又は酸素富化空気とを
供給する酸素供給管２２，冷却水を給排する給水管２３
及び排水管２４が設けられている。なお、球状化バーナ
ー１５，１６は、従来のものと同様の構成のものを用い
ることができるので、その詳細な説明は省略する。
【００１１】上記構成の装置において、フィーダー１１
から供給される原料粉は、酸素供給設備１２から管１２
ａを介して導入される搬送用酸素ガスに搬送されてサイ
クロン１３に導入される。このサイクロン１３では、該
サイクロン１３の構造や搬送ガスの速度等を適当に設定
して、例えば、原料粉を１０μｍ程度で分級し、底部か
ら１０μｍ以上の粗粒粉を、天井部から１０μｍ以下の
微粒粉を、それぞれ導出するようにする。
【００１２】これにより、サイクロン１３の底部から
は、概ね１０μｍ以上の粒度を有する粗粒粉が導出され
て前記粗粒粉用球状化バーナー１５に供給され、サイク
ロン１３の天井部からは、概ね１０μｍ以下の粒度を有
する微粒粉が導出されて前記微粒粉用球状化バーナー１
６に供給される。このとき、微粒粉は、前記搬送用酸素
ガスにより管１３ａを介して微粒粉用球状化バーナー１
６へ搬送され、粗粒粉は、酸素供給設備１２から分岐管
１２ｂを介して供給される搬送用酸素ガスの一部によ
り、管１３ｂを経て粗粒粉用球状化バーナー１５に供給
される。なお、装置のレイアウトや原料粉の性状によ
り、粗粒粉が重力落下だけで粗粒粉用球状化バーナー１
５に供給できるときは、分岐管１２ｂからの搬送ガスを
省略することもできる。
【００１３】このように原料粉をサイクロン１３で分級
して火炎中での速度が異なる粗粒粉と微粒粉とを分別
し、粗粒粉を粗粒粉用球状化バーナー１５で、微粒粉を
微粒粉用球状化バーナー１６で、それぞれ別個に球状化
処理することにより、火炎中での速度分布の範囲が狭く
なり、粒子同士の衝突の確率が小さくなるので、瘤付き
粒子の発生を抑えることができる。
【００１４】また、両バーナー１５，１６において、そ
れぞれ原料粉の粒度分布に応じた火炎条件を設定するこ
とが可能となり、例えば、微粒粉用球状化バーナー１６
では、微粒子を過度に加熱して蒸発させないように火炎
温度を低くすることができるので、超微粉の発生を抑え
ることができる。
【００１５】なお、本発明の無機質球状化粒子の製造装
置は、上記実施例に限定されるものではなく、球状化バ
ーナーに供給する燃料は、バーナーの構成に応じてＬＰ
Ｇ以外の気体，液体，固体燃料のいずれでも用いること
が可能であり、両バーナーで異なる燃料を用いてもよ
い。
【００１６】また、支燃性ガスの酸素濃度は、燃料の種
類やバーナーの構造、火炎温度等に応じて適宜に設定す
ることが可能であり、原料粉搬送用のガスを分岐して用
いてもよく、別の酸素供給設備からの酸素等を用いるよ
うにしてもよい。さらに、原料粉搬送用のガスには、酸
素以外のガスを用いることができる。
【００１７】また、サイクロン等の分離装置であらかじ
め粗粒粉と微粒粉とに分別してからそれぞれを別のフィ
ーダーでそれぞれのバーナーに供給するように構成する
ことも可能ではあるが、一度微粒子に分離してから回収
したものは、著しく凝集しているため、均一な搬送が困
難になること、凝集溶融品が発生しやすいこと、費用も
かかることなどから実際的ではない。
【００１８】したがって、上記のように、両バーナーの
直前で粗粒粉と微粒粉とに分離し、ただちに各バーナー
に供給するように構成することが望ましい。また、フィ
ーダーから供給される原料粉の粒度分布がかなり広いと
きには３段階以上に分別することも可能であり、この場
合は、適当な粒径以下の原料粉だけを球状化処理するよ
うにすることもできる。
【００１９】
【発明の効果】以上説明したように、本発明の無機質球
状化粒子の製造装置は、球状化処理する無機質球状化粒
子を粗粒粉と微粒粉とに分別する分離装置を設けるとと
もに、分離した粗粒粉と微粒粉とをそれぞれ別個に球状
化処理する粗粒粉用球状化バーナーと微粒粉用球状化バ
ーナーとを設けたので、火炎中での原料粉の粒度分布が
狭くなるため、火炎中での原料粉の速度分布の範囲が狭
くなり、粒子同士の衝突による瘤付き粒子の発生を抑え
ることができる。
【００２０】また、微粒子用球状化バーナーの火炎温度
を低めに設定することにより、微粒子の過度の昇温を防
止して超微粉の発生を抑えることができるので、バグフ
ィルターでの払い落としが容易になる。これにより、バ
グフィルターの濾過速度を上げることができ、装置のコ
ンパクト化やバグフィルターの払い落としのためのパル
スジェットガスの圧力低減による濾布の寿命延長も図れ
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing inorganic spheroidized particles used as a filler or the like. The present invention relates to an apparatus for producing inorganic spheroidized particles by processing. 2. Description of the Related Art For example, as described in Japanese Patent Application Laid-Open No. 58-145613, silicon dioxide (silica)
It is known to produce inorganic spheroidized particles by passing an inorganic raw material powder such as this through a flame. A high-temperature flame is required to spheroidize the raw material powder in the flame,
Oxygen-gas fuel burners have been used. FIG. 2 is a system diagram showing an example of a conventional apparatus for producing inorganic spheroidized particles. Inorganic raw material powder such as silica is cut out from a usual feeder 1 and conveyed to a sphering burner 2 using oxygen as a carrier gas, for example.
The spheroidizing burner 2 is supplied with oxygen from the oxygen supply facility 3 and fuel gas from the LPG supply facility 4. Particles spheroidized in the flame in the furnace 5 pass through the furnace 6 through the path 6. The temperature is diluted by the air introduced into the chamber 5 and collected by the subsequent cyclone 7 and bag filter 8. [0004] In the apparatus for producing inorganic spheroidized particles as described above, as the inorganic raw material powder, usually,
A material having a wide particle size distribution that is pulverized by a ball mill or the like is used. When a raw material powder having such a wide particle size distribution is injected into the flame of a spheroidizing burner, the behavior of the particles in the flame is such that the smaller the particles, the higher the particle velocity, and the higher the concentration of the particles in the flame. In such a case, the molten coarse particles and the fine particles collide with each other, and thus particles with bumps may be generated. Such particles with knobs need to be removed with a sieve or the like as defective products, and improvements in product yield and productivity have been desired. [0005] Further, if the raw material powder having a small particle size is excessively heated in a flame, it may evaporate to an ultrafine powder.
This ultrafine powder causes clogging of the bag filter at the subsequent stage and is difficult to remove, resulting in various inconveniences. Accordingly, an object of the present invention is to provide an apparatus for producing inorganic spheroidized particles, which can prevent the generation of the above-mentioned particles with knobs and also prevent the generation of ultrafine powder due to excessive heating of the raw material powder. I have. [0007] In order to achieve the above object, the apparatus for producing inorganic spheroidized particles of the present invention is provided with a separation device for separating inorganic raw material powder into coarse powder and fine powder. In addition, a spheroidizing burner for coarse powder and a spheroidizing burner for fine powder for separately spheroidizing the separated coarse powder and fine powder are provided. According to the above construction, since the particle size distribution of the inorganic raw material powder supplied to each spheroidizing burner becomes small, the velocity distribution of the raw material powder in the flame also becomes small, and the particles collide with each other. Is reduced, the occurrence of particles with bumps can be suppressed. Further, since the flame temperature can be set according to the particle size distribution, it is possible to prevent the generation of ultrafine powder due to the raw material powder having a small particle size being excessively heated and evaporated in the flame. The present invention will be described in more detail with reference to an embodiment shown in FIG. The apparatus for producing inorganic spheroidized particles shown in FIG. 1 includes a feeder 11 for supplying raw material powder such as silica pulverized by a ball mill, an oxygen supply facility 12 for supplying a carrier gas for transporting the raw material powder, Cyclone 13 as a separation device for separating into granular powder and fine powder
And a sphering burner 15 for coarse powder and a sphering burner 16 for fine powder provided in the sphering furnace 14.
At the subsequent stage of the sphering furnace 14, a cyclone and a bag filter for collecting the generated spheroidized particles are provided as in the conventional case. Each of the two burners 15 and 16 has a fuel supply pipe 21 for supplying fuel such as propane (LPG) and an oxygen supply pipe for supplying oxygen as a supporting gas or oxygen-enriched air. 22, water supply pipe 23 for supplying and discharging cooling water
And a drain pipe 24 is provided. The spheroidizing burners 15 and 16 may have the same configuration as that of the conventional sphering burner, and therefore, detailed description thereof will be omitted. In the apparatus having the above structure, the feeder 11
Is supplied from the oxygen supply equipment 12 to the pipe 12
The carrier gas is transported by the transport oxygen gas introduced through a and is introduced into the cyclone 13. In the cyclone 13, the structure of the cyclone 13, the speed of the carrier gas, and the like are appropriately set, for example, the raw material powder is classified into about 10 μm, and the coarse powder of 10 μm or more from the bottom and 10 μm or less from the ceiling are removed. The fine powder is derived respectively. As a result, coarse powder having a particle size of about 10 μm or more is led out from the bottom of the cyclone 13 and supplied to the spheroidizing burner 15 for coarse powder, and approximately 10 μm from the ceiling of the cyclone 13. The fine powder having the following particle size is derived and the spheroidizing burner 1 for fine powder is used.
6. At this time, the fine powder is supplied by the oxygen gas for conveyance through the pipe 13a to the spheroidizing burner 1 for fine powder.
The coarse powder is conveyed to 6 and supplied to the coarse powder sphering burner 15 via a pipe 13b by a part of the transport oxygen gas supplied from the oxygen supply equipment 12 via a branch pipe 12b. Note that, depending on the layout of the apparatus and the properties of the raw material powder, the coarse powder is simply dropped by gravity and the spheroidizing burner 1 for coarse powder is used.
5, the carrier gas from the branch pipe 12b can be omitted. As described above, the raw material powder is classified by the cyclone 13 to separate coarse powder and fine powder having different speeds in the flame, and the fine powder is separated by the spheroidizing burner 15 for coarse powder. By performing the spheroidizing treatment separately with the spheroidizing burner 16 for fine powder, the range of the velocity distribution in the flame is narrowed, and the probability of collision between the particles is reduced. Can be. Further, it is possible to set flame conditions in both burners 15 and 16 in accordance with the particle size distribution of the raw material powder.
In this case, since the flame temperature can be lowered so that the fine particles are not excessively heated and evaporated, the generation of ultrafine powder can be suppressed. The apparatus for producing inorganic spheroidized particles of the present invention is not limited to the above-described embodiment, and the fuel supplied to the spheroidized burner depends on the configuration of the burner.
Any gas, liquid, or solid fuel other than G can be used, and different fuels may be used for both burners. Further, the oxygen concentration of the supporting gas can be appropriately set according to the type of fuel, the structure of the burner, the flame temperature, and the like. Alternatively, oxygen or the like from another oxygen supply facility may be used. Further, a gas other than oxygen can be used as the gas for transporting the raw material powder. It is also possible to separate coarse particles and fine particles in advance by a separation device such as a cyclone and then supply the separated particles to respective burners by separate feeders. What is collected afterwards is not practical because it is extremely aggregated, making uniform transport difficult, easy to produce agglomerated molten products, and expensive. Therefore, as described above, it is desirable that the powder is separated into coarse powder and fine powder immediately before both burners, and is supplied to each burner immediately. When the particle size distribution of the raw material powder supplied from the feeder is considerably wide, it is possible to separate the raw material powder into three or more stages. In this case, only the raw material powder having an appropriate particle size or less should be subjected to spheroidizing treatment. You can also. As described above, the apparatus for producing inorganic spheroidized particles of the present invention is provided with a separation device for separating inorganic spheroidized particles to be spheroidized into coarse particles and fine particles. Since the coarse-grained powder and the fine-grained powder are separately provided with the spheroidizing burner for coarse powder and the spheroidizing burner for fine powder, the particle size distribution of the raw material powder in the flame is narrowed. For this reason, the range of the velocity distribution of the raw material powder in the flame is narrowed, and it is possible to suppress the generation of particles with bumps due to collision of the particles. Also, by setting the flame temperature of the spheroidizing burner for fine particles at a low temperature, excessive heating of the fine particles can be prevented and generation of ultrafine powder can be suppressed, so that it is easy to remove the fine particles with a bag filter. become. As a result, the filtration speed of the bag filter can be increased, and the life of the filter cloth can be extended by downsizing the apparatus and reducing the pressure of the pulse jet gas for removing the bag filter.
【図面の簡単な説明】
【図１】 本発明の無機質球状化粒子の製造装置の一実
施例を示す要部の系統図である。
【図２】 従来の無機質球状化粒子の製造装置の一例を
示す系統図である。
【符号の説明】
１１…フィーダー、１２…酸素供給設備、１３…サイク
ロン、１４…球状化炉、１５…粗粒粉用球状化バーナ
ー、１６…微粒粉用球状化バーナーBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram of a main part showing one embodiment of an apparatus for producing inorganic spheroidized particles of the present invention. FIG. 2 is a system diagram showing an example of a conventional apparatus for producing inorganic spheroidized particles. [Description of Signs] 11 ... Feeder, 12 ... Oxygen supply equipment, 13 ... Cyclone, 14 ... Spheronizing furnace, 15 ... Spheroidizing burner for coarse powder, 16 ... Spheroidizing burner for fine powder
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B01J 2/00 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) B01J 2/00
Claims (1)
支燃性ガスとする球状化バーナーの火炎で球状化処理す
る無機質球状化粒子の製造装置において、前記無機質原
料粉を粗粒粉と微粒粉とに分別する分離装置を設けると
ともに、分離した粗粒粉と微粒粉とをそれぞれ別個に球
状化処理する粗粒粉用球状化バーナーと微粒粉用球状化
バーナーとを設けたことを特徴とする無機質球状化粒子
の製造装置。(57) [Claims 1] In an apparatus for producing inorganic spheroidized particles, the inorganic raw material powder is subjected to spheroidizing treatment with a flame of a spheroidizing burner using oxygen or oxygen-enriched air as a supporting gas. A separation device for separating the inorganic raw material powder into coarse-grained powder and fine-grained powder is provided, and the separated coarse-grained powder and fine-grained powder are separately spheroidized. An apparatus for producing inorganic spheroidized particles, comprising: a burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03218394A JP3511180B2 (en) | 1994-03-02 | 1994-03-02 | Production equipment for inorganic spheroidized particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03218394A JP3511180B2 (en) | 1994-03-02 | 1994-03-02 | Production equipment for inorganic spheroidized particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07241451A JPH07241451A (en) | 1995-09-19 |
| JP3511180B2 true JP3511180B2 (en) | 2004-03-29 |
Family
ID=12351812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03218394A Expired - Lifetime JP3511180B2 (en) | 1994-03-02 | 1994-03-02 | Production equipment for inorganic spheroidized particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3511180B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6303241B2 (en) * | 2015-01-15 | 2018-04-04 | 大陽日酸株式会社 | Inorganic spheroidized particle manufacturing apparatus and inorganic spheroidized particle manufacturing method |
| JP7189096B2 (en) * | 2019-07-22 | 2022-12-13 | 株式会社トクヤマ | Method for producing inorganic oxide powder |
-
1994
- 1994-03-02 JP JP03218394A patent/JP3511180B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07241451A (en) | 1995-09-19 |
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