JPH10194741A - Flaky titanium dioxide granule and its production - Google Patents
Flaky titanium dioxide granule and its productionInfo
- Publication number
- JPH10194741A JPH10194741A JP36489997A JP36489997A JPH10194741A JP H10194741 A JPH10194741 A JP H10194741A JP 36489997 A JP36489997 A JP 36489997A JP 36489997 A JP36489997 A JP 36489997A JP H10194741 A JPH10194741 A JP H10194741A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- titanium dioxide
- particle powder
- particles
- flaky
- 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.)
- Granted
Links
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は四塩化チタンを気相酸化
して得られた二酸化チタン粒子粉末であって塩素ガス含
有量を一定量以下に除去処理した粒子粉末を加圧成形し
て成る、移送、保管、輸送などにおいて取扱いが容易な
フレーク状二酸化チタン成形体及びその製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a titanium dioxide particle powder obtained by subjecting titanium tetrachloride to gas-phase oxidation, which is obtained by subjecting a particle powder having a chlorine gas content to a predetermined amount or less to pressure molding. The present invention relates to a flaky titanium dioxide molded article which is easy to handle in transportation, storage, transportation and the like, and a method for producing the same.
【０００２】[0002]
【発明の技術的背景と課題】一般的に気相反応によって
製造された金属粒子、金属酸化物粒子などの固体粒子粉
末は、サイクロン、バッグフィルターなどの固−気分離
捕集装置によって、副生ガス、未反応ガス、キャリヤー
ガスなどのガス流体から分離捕集される。BACKGROUND OF THE INVENTION In general, solid particles such as metal particles and metal oxide particles produced by a gas phase reaction are produced as by-products by a solid-gas separation and collection device such as a cyclone or a bag filter. Separated and collected from gas fluids such as gas, unreacted gas and carrier gas.
【０００３】しかしながら、気相反応で発生する副生ガ
スや未反応ガスなどの有害成分ガスは、分離捕集された
固体粒子表面に付着されているほか、該固体粒子粉末中
に吸蔵されて取込まれ易く、このため有害成分の実質的
全部を固−気分離することはきわめて困難とされてい
る。However, harmful component gases such as by-product gas and unreacted gas generated in the gas phase reaction adhere to the surface of the solid particles separated and collected, and are absorbed and absorbed in the solid particle powder. Therefore, it is extremely difficult to perform solid-gas separation of substantially all of the harmful components.
【０００４】ところでハロゲン化チタンを気相で酸化し
て二酸化チタンの粒子粉末を製造する気相系合成法は、
古くから行われてきているいわゆる硫酸法という液相系
合成法に対して、高白色度の分散性の優れた二酸化チタ
ン顔料を比較的小型の装置構成で大量生産が可能で、か
つ生産効率的にも、またコスト的にも有利であり、さら
に工程より副生されるいわゆる廃棄物の発生量が少ない
など、近年急速に工業的実施普及がはかられつつある。[0004] A gas-phase synthesis method for producing titanium dioxide particle powder by oxidizing titanium halide in the gas phase involves the following steps.
Compared to the liquid-phase synthesis method called sulfuric acid method, which has been practiced for a long time, titanium dioxide pigment with high whiteness and excellent dispersibility can be mass-produced with a relatively small device configuration, and production efficiency is high. In addition, it is advantageous in terms of cost and the amount of so-called waste generated as a by-product from the process is small.
【０００５】しかして前記気相系合成法において、四塩
化チタンを気相酸化することによって生成する二酸化チ
タン粒子粉末は、副生する刺激性臭気の塩素ガスや未反
応四塩化チタンガスなどの有害成分ガスからサイクロン
やバッグフィルターで分離捕集される。分離捕集された
二酸化チタン粒子粉末には、塩素系不純物の有害成分ガ
スが、約６５〜７５％程度（該二酸化チタン粒子粉末含
有ガス容積基準）残留しており、このものは種々の適用
媒体系で分散性などをはじめ顔料特性をいちじるしく損
ねるとともに、腐食性や環境汚染性などから禁忌されて
おり、種々の除去方法が提案されている。[0005] In the above-mentioned gas-phase synthesis method, titanium dioxide particles produced by subjecting titanium tetrachloride to gas-phase oxidation produce irritating odors such as chlorine gas of unpleasant odor and unreacted titanium tetrachloride gas. It is separated and collected from the component gas by a cyclone or bag filter. In the separated and collected titanium dioxide particles, about 65 to 75% (based on the volume of the gas containing titanium dioxide particles) of the harmful component gas of chlorine-based impurities remains. Pigment properties such as dispersibility are significantly impaired in the system and are contraindicated due to corrosiveness and environmental pollution, and various removal methods have been proposed.
【０００６】前記のようにして固−気分離捕集された二
酸化チタン粒子粉末は、水中に投入してスラリー状と
し、水酸化ナトリウム、アンモニアなどのアルカリで中
和して残留している塩素系不純物を湿式系で除去処理し
ている。しかしながら前記のように湿式系処理する場合
は該処理後、濾過、洗浄、乾燥し、さらには粉砕などの
処理を必要とし、コスト高となるのみならず、処理過程
で二次的凝集などが惹起し易かったりする。とりわけ分
離捕集された二酸化チタン粒子粉末を、次段で表面仕上
処理を施用せず、例えば遠隔地へスラリー輸送し当該地
で表面仕上処理を行う場合は、輸送コンテナーの腐食性
の問題とともに大量の水性媒液を輸送するためのコスト
面の負担が大きく、また濾過、洗浄、乾燥、粉砕などの
処理を行った後、遠隔地へ輸送する場合は、表面仕上処
理時に、再度、スラリー化して該表面仕上処理を施し、
その後、濾過、洗浄、乾燥、粉砕などの処理を繰返す必
要があり、一層コスト面の負担が大きくなる。The titanium dioxide particles collected by solid-gas separation and collection as described above are put into water to form a slurry, and the remaining chlorine-based particles are neutralized with an alkali such as sodium hydroxide or ammonia. The impurities are removed by a wet system. However, in the case of performing wet processing as described above, filtration, washing, drying, and further processing such as pulverization are required after the processing, which not only increases the cost but also causes secondary aggregation and the like in the processing process. It is easy to do. Especially when the titanium dioxide particles separated and collected are not subjected to the surface finishing treatment in the next step, for example, when the slurry is transported to a remote location and the surface finishing treatment is performed in that location, a large amount of the titanium dioxide particles will be added together with the corrosiveness of the transport container. The cost burden for transporting the aqueous medium is large, and after processing such as filtration, washing, drying, and pulverization, when transporting to a remote location, during surface finishing treatment, the slurry is again formed. Subject the surface finish treatment,
Thereafter, it is necessary to repeat processes such as filtration, washing, drying, and pulverization, which further increases the cost burden.
【０００７】一方、前記固−気分離捕集された塩素系不
純物の有害成分ガスを含有する二酸化チタン粒子粉末
を、いわゆる乾式系で除去処理する方法としては、例え
ば、（イ）気相反応で生成した二酸化チタン粒子粉末
を、５００〜８００℃で加熱処理する方法、（ロ）前記
（イ）の処理において、水蒸気あるいは水蒸気とホウ酸
などのガスと反応させる方法、（ハ）前記（イ）におい
て、水蒸気や酸素などのガス流体を、二酸化チタン粒子
粉末を含有するガス流体の流れに対して十字流となるよ
うに音速または超音速で噴射する方法などが提案されて
いる。しかしながら、前記のこれらの方法による場合に
は、有害成分ガスの除去が十分でなかったり、多量の洗
浄用ガスを必要とするため副生ガスの再利用が難しかっ
たり、また高温での処理の場合には、エネルギーコスト
の増大を来たすのみならず、粒子粉末が、粒子成長した
り、焼結して粗大化したりして顔料特性が損なわれ易す
かったりし、さらには前記水蒸気処理を行う場合には、
生成した塩化水素ガスが設備の腐食を惹起するなど、い
ずれも未だ満足されるには至っておらず、その改善が強
く希求されている。On the other hand, as a method for removing the titanium dioxide particle powder containing a harmful component gas of chlorine-based impurities collected by solid-gas separation by a so-called dry system, for example, (a) a gas phase reaction is used. A method of heat-treating the generated titanium dioxide particle powder at 500 to 800 ° C., (b) a method of reacting steam or steam with a gas such as boric acid in the treatment of (a), (c) a method of (a) Has proposed a method of injecting a gas fluid such as water vapor or oxygen at a sonic or supersonic speed so as to form a cross flow with respect to the flow of the gas fluid containing the titanium dioxide particle powder. However, in the case of the above-described methods, the removal of harmful component gases is not sufficient, or a large amount of cleaning gas is required, so that it is difficult to reuse by-product gas. In addition to the increase in energy cost, the particle powder, particle growth, or sintering or coarsening or pigment properties are likely to be impaired, furthermore, when performing the steam treatment Is
Neither of them has yet been satisfied, for example, the generated hydrogen chloride gas causes corrosion of equipment, and there is a strong demand for improvement.
【０００８】[0008]
【課題を解決するための手段】本発明者等は、かねてよ
り、四塩化チタンを気相酸化して得られた二酸化チタン
粒子粉末を含有したガス流体を固−気分離捕集器で該粒
子を分離捕集した塩素ガスなどの有害成分ガスが残留し
た粒子粉末より、有害成分ガスを、比較的簡便な処理手
段で効率よく、工業的有利にその実質的全部を除去し得
る方法を提供することを目的として、種々検討を進め
た。その結果、固−気分離捕集器で分離捕集された有害
成分ガスを残留する二酸化チタン粒子粉末を、先ず副生
ガスの再利用を阻害しない程度の比較的少量の不活性ガ
スで有害成分ガスを置換洗浄して大半の有害成分ガスを
除去した後、次いで攪拌機付流動層中で、なお残留吸蔵
している有害成分ガスを放出除去処理することによっ
て、塩素ガスを粒子重量に対して０．０５ppm 以下含有
する二酸化チタン粒子粉末が得られること、さらに該粒
子粉末を加圧ロール成形機などの加圧成形機で高密度化
処理をすることによって塩素ガスなどの有害成分ガスが
除去された嵩密度が０．８ｇ／cm3 以上のフレーク状二
酸化チタン粉粒体が得られること、さらに該粉粒体を用
いることによって、有害成分ガスが除去された二酸化チ
タン粒子粉末の移送、貯蔵、包装、輸送などの取扱い作
業性がいちじるしく容易となるとともに、バルク輸送作
業等の効率化、安全性、コスト軽減化を図ることができ
るなどの知見を得、本発明を完成するに至ったものであ
る。Means for Solving the Problems The present inventors have previously used a gas-solid separator to collect a gas fluid containing titanium dioxide particles obtained by vapor-phase oxidation of titanium tetrachloride. A method for removing harmful component gases efficiently from the particle powder in which harmful component gases such as chlorine gas remaining by separating and trapping harmful component gases by relatively simple processing means, and industrially advantageously removing substantially all of them. For this purpose, various studies were conducted. As a result, the titanium dioxide particle powder remaining with the harmful component gas separated and collected by the solid-gas separation collector is first converted into a harmful component with a relatively small amount of inert gas that does not hinder the reuse of by-product gas. After removing most of the harmful component gas by replacing and cleaning the gas, the chlorine gas is reduced to 0 wt. A harmful component gas such as chlorine gas was removed by obtaining a titanium dioxide particle powder containing 0.05 ppm or less and subjecting the particle powder to a high-density treatment with a pressure molding machine such as a pressure roll molding machine. bulk density be 0.8 g / cm 3 or more flaky titanium dioxide granular material can be obtained, further by using the powder granules, the transfer of the titanium dioxide particles harmful component gas has been removed, the storage With the knowledge that the handling workability of packaging, transportation, etc. is extremely easy, the efficiency of bulk transportation work etc., safety, cost reduction can be achieved, and the present invention has been completed. is there.
【０００９】すなわち本発明は、（１）四塩化チタンを
気相酸化して得られた、塩素ガスを粒子重量に対して
０．０５ppm 以下含有する二酸化チタン粒子粉末を加圧
成形して成る、嵩密度が０．８ｇ／cm3 以上のフレーク
状二酸化チタン粉粒体、（２）加圧ロール成形機を用
い、該成形機のロール圧縮荷重を０．５〜４ton/cm2 以
上にして加圧成形した前１項のフレーク状二酸化チタン
粉粒体、（３）四塩化チタンを気相酸化して得られた、
塩素ガスを含有する二酸化チタン粒子粉末を、固−気接
触器に導入して不活性ガス流と向流接触させ、次いで攪
拌流動層に導入して塩素ガスを粒子重量に対して０．０
５ppm 以下になるまで除去処理し、しかる後処理粒子粉
末を加圧成形することを特徴とするフレーク状二酸化チ
タン粉粒体の製造方法および、（４）加圧ロール成形機
を用い、該成形機のロール圧縮荷重を０．５〜４ton/cm
2 にして加圧成形する前３項のフレーク状二酸化チタン
粉粒体の製造方法である。That is, the present invention provides (1) pressure-forming titanium dioxide particle powder obtained by vapor-phase oxidation of titanium tetrachloride and containing chlorine gas of 0.05 ppm or less based on the particle weight. A flake-form titanium dioxide powder having a bulk density of 0.8 g / cm 3 or more. (2) Using a pressure roll forming machine, applying a roll compression load of 0.5 to 4 ton / cm 2 or more. 1. The flaky titanium dioxide powder and granular material according to the above item 1, which is obtained by vapor-phase oxidation of titanium tetrachloride.
Titanium dioxide particle powder containing chlorine gas is introduced into a solid-gas contactor to bring it into countercurrent contact with an inert gas flow, and then introduced into a stirred fluidized bed to introduce chlorine gas at a particle weight of 0.0
A method for producing a flaky titanium dioxide powder, which comprises subjecting the particles to a removal treatment to 5 ppm or less and subjecting the post-treated particles to pressure molding; and (4) a press roll molding machine, Roll compression load of 0.5-4ton / cm
2. The method for producing a flaky titanium dioxide powder according to the item 3 before press-molding into 2 .
【００１０】本発明の適用にあたって、四塩化チタンの
気相酸化によって発生する二酸化チタン粒子を含有した
ガス流体を固−気分離器に導入して該粒子とガスとを分
離する。固−気分離器としては、粉体工業で一般的に用
いられている種々の乾式の分離器、例えばサイクロンな
どの遠心分離器、バッグフィルターなどの濾過分離器、
電気集塵機など静電分離器などが挙げられる。In applying the present invention, a gas fluid containing titanium dioxide particles generated by the vapor phase oxidation of titanium tetrachloride is introduced into a solid-gas separator to separate the particles from the gas. As the solid-gas separator, various dry separators generally used in the powder industry, for example, a centrifugal separator such as a cyclone, a filter separator such as a bag filter,
Examples include an electrostatic separator such as an electric dust collector.
【００１１】固−気分離器でガス流体から分離捕集され
た有害成分ガス含有二酸化チタン粒子粉末は、例えば次
のように処理される。本発明を実施するための装置構成
の一例を示す図１にもとづいて、これを説明する。The harmful component gas-containing titanium dioxide particles separated and collected from the gas fluid by the solid-gas separator are treated, for example, as follows. This will be described with reference to FIG. 1 showing an example of a device configuration for implementing the present invention.
【００１２】固−気分離器１で分離捕集された有害成分
ガスを含有する二酸化チタン粒子粉末は、先ず１の底部
から降下管状の向流固−気接触器２に導入される。他方
２の底部よりは不活性ガスが導入され、二酸化チタン粒
子は２を降下しながら不活性ガスの上向流と向流接触す
ることによって、二酸化チタン粒子粉末に含有される有
害成分ガスは、置換洗浄される。前記不活性ガス流は、
副生ガスの再利用が阻害されないようになるべく少量で
あるのが望ましく、また流速としては、吹出し速度が５
〜３０ｍ／秒程度でありかつ空塔速度１〜１０cm／秒程
度である。前記範囲より低きに過ぎると有害成分ガスの
置換洗浄が十分になされず、一方前記範囲より高きに過
ぎると副生ガスの再利用が阻害され易くまた二酸化チタ
ン粒子粉末の所望量の抜出し移送が損なわれたりする。
なお気相反応系が高圧系で操作される場合は、前記二酸
化チタン粒子粉末の抜出し移送に際してバルブの開閉操
作を繰り返しながら大気圧迄減圧する。二酸化チタン粒
子や気相反応系の種類、有害成分ガスの種類、装置の構
成や大きさなどにより異なり一概に言えないが、前記の
処理によって、被処理二酸化チタン粒子が含有する有害
成分ガスの約９０〜９６％程度を置換除去することがで
きる。The titanium dioxide particle powder containing the harmful component gas separated and collected by the solid-gas separator 1 is first introduced into the descending tubular countercurrent solid-gas contactor 2 from the bottom of 1. On the other hand, an inert gas is introduced from the bottom of 2 and the titanium dioxide particles come down in contact with the upward flow of the inert gas while descending 2, whereby the harmful component gas contained in the titanium dioxide particle powder becomes It is replaced and washed. The inert gas stream comprises:
It is desirable to use a small amount of the by-product gas so that the reuse of the by-product gas is not hindered.
About 30 m / sec, and the superficial velocity is about 1-10 cm / sec. If it is lower than the above range, the replacement cleaning of the harmful component gas is not sufficiently performed, while if it is higher than the above range, the reuse of the by-product gas is easily hindered and the desired amount of the titanium dioxide particle powder is withdrawn and transferred. Or be impaired.
When the gas-phase reaction system is operated in a high-pressure system, the pressure is reduced to the atmospheric pressure while repeating the opening and closing operations of the valve when extracting and transferring the titanium dioxide particles. The type of the titanium dioxide particles and the gas-phase reaction system, the type of the harmful component gas, the configuration and the size of the apparatus, etc., cannot be described unconditionally. About 90 to 96% can be replaced and removed.
【００１３】前記のようにして不活性ガス流による処理
を行った二酸化チタン粒子粉末は、次いで攪拌機構付き
の流動層８に導入し、他方８の底部より多孔板１０を介
して気体を吹込むことによって流動化させるとともに攪
拌機による強制的な剪断作用により、二酸化チタン粒子
の表面に付着したり、粒子間隙に吸蔵されたりしている
残留有害成分ガスを、きわめて効率よくガス洗浄して除
去することができる。前記吹込み気体としては種々のも
のを使用し得るが、例えば空気、酸素、窒素ガスなどを
使用し得る。攪拌流動層の流動化速度および、攪拌翼の
速度は、それぞれ５〜30cm／秒程度でありまた周端速度
が１〜５秒（同一地点を通過する間隔）程度であるのが
よい。前記攪拌翼の形状は種々の型式のものを使用し得
るがなるべく縦方向に粉末粒子を剪断するような形状の
もので、縦形の種々型式のものが好ましい。前記流動化
速度が前記範囲より、小さ過ぎると有害成分ガスの所望
の除去効果がもたらされず、一方前記範囲より大き過ぎ
るといわゆるピストンフローを惹起し流動層の均一性が
損なわれ効率的なガス洗浄効果がもたらされなくなる。The titanium dioxide particles treated with the inert gas flow as described above are then introduced into a fluidized bed 8 equipped with a stirring mechanism, and gas is blown from the bottom of the other 8 through a perforated plate 10. By means of fluidization and forced shearing by a stirrer, highly efficient gas cleaning and removal of residual harmful component gases adhering to the surface of titanium dioxide particles or occluded in the particle gaps Can be. Various types of blowing gas can be used, and for example, air, oxygen, nitrogen gas and the like can be used. The fluidization speed of the stirring fluidized bed and the speed of the stirring blade are preferably about 5 to 30 cm / sec, respectively, and the peripheral speed is preferably about 1 to 5 seconds (interval passing through the same point). Various types of stirring blades can be used, but the stirring blades are shaped so as to shear the powder particles in the vertical direction as much as possible, and various vertical types are preferable. If the fluidization speed is lower than the above range, the desired removal effect of the harmful component gas will not be obtained, while if it is higher than the above range, so-called piston flow will be caused, and the uniformity of the fluidized bed will be impaired and efficient gas cleaning will be performed. No effect.
【００１４】残留有害成分ガスを含有した二酸化チタン
粒子は、攪拌流動層８の上部もしくは側部から連続的に
あるいは間欠的に供給され所定時間洗浄ガスと混合接触
した後排出される。排気ガスは、有害成分ガスを含んで
いるので吸収設備に導入して無害処理後排出される。The titanium dioxide particles containing the residual harmful component gas are continuously or intermittently supplied from the upper or side portion of the stirred fluidized bed 8 and discharged after mixing with the cleaning gas for a predetermined time. Since the exhaust gas contains harmful component gas, it is introduced into an absorption facility and discharged after harmless treatment.
【００１５】本発明においては、前記のようにして攪拌
流動層中で残留有害成分ガスが除去処理された二酸化チ
タン粒子粉末を、さらに高密度化処理して嵩密度を高め
当該粉体の移送、包装、保管、輸送などにおける取扱作
業性を一層容易にするとともに、コスト面でも工業的優
位性をさらに高めることができる。前記の高密度化処理
は、種々の方法によっておこなうことができるが、例え
ば加圧ロール式の圧縮成形機を用いて嵩密度を0.8g／cm
3 以上に高めることによって、フレーク状の解れ易い粉
粒体を得ることができる。このものは前記取扱い作業性
が良好なものであって、かつその後の水性スラリー化に
おいて容易に優れた分散懸濁系とし得るものである。In the present invention, the titanium dioxide particle powder from which the residual harmful component gas has been removed in the stirred fluidized bed as described above is further densified to increase the bulk density and transfer the powder. In addition to facilitating handling workability in packaging, storage, transportation, and the like, it is possible to further enhance the industrial advantage in terms of cost. The above densification treatment can be performed by various methods, for example, using a pressure roll type compression molding machine to increase the bulk density to 0.8 g / cm.
By increasing the value to 3 or more, a flake-like powder that can be easily broken can be obtained. This has good handling operability and can easily be used as an excellent suspension in an aqueous slurry.
【００１６】[0016]
【実施例】実施例について図１を参照して説明すると、
四塩化チタンの気相酸化反応によって二酸化チタン顔料
を製造する工程で、反応ガスＡを固−気分離装置１で二
酸化チタン粒子と副生ガスＢとに分離する。固−気分離
装置１の下部に向流固−気接触器２を接続し、塩素ガス
成分を含有した二酸化チタン粒子と不活性ガスを向流接
触させ、塩素ガスを粗置換する。この接触器は内径３０
cmで長さ２ｍである。二酸化チタン粒子の見掛け降下速
度は１〜５cm／秒である。この接触器下部管壁に４mm径
の孔を周１６個開け、不活性ガスＣを５〜２０cm／秒の
速度で二酸化チタン粒子に吹付け、上昇流も含めて塩素
ガスを粗置換する。この時700,000ppm の入口塩素ガス
濃度が約30,000ppm 迄除去される。ここでの除去率は９
０％以上である。減圧容器４は、酸化反応が高圧系で行
なわれる場合、ここで反応系との遮断を行なうと同時に
次の操作のため大気圧に下げる装置である。操作はバル
ブ３，５，６の開閉で次のようにバルブ５，６閉−３開
−３閉−６開−６閉−５開−５閉の順で行なう。減圧容
器の大きさは攪拌流動層の大きさ及び二酸化チタン粒子
の供給方法によって決定される。減圧時排気されるガス
は、塩素ガスを含んでいるので吸収塔１２で吸収処理す
る。次の攪拌流動層は内径５００mm、高さ2,500mm の透
明塩ビで作られており、下部分散盤は２mm径の孔がピッ
チ１２mm（開口比２．５％）で開けられている。攪拌機
翼形は門型で、外径は485mm 、高さは500mm 、翼巾は75
mmの２枚羽根であり、５〜３０回転／分で回転する。二
酸化チタン粒子の静置層高さを500 〜1000mmとし、流動
ガスＤとして空気を用い、空塔速度５〜３０cm／秒で該
粒子を流動化させると、２０〜１５０秒の滞留時間で塩
素ガス濃度を二酸化チタン粒子粉末取扱い上支障のない
０．０５ppm 以下に除去することができる。次に塩素ガ
スが除去された二酸化チタン粒子は一般的な加圧ロール
型圧縮機１１に供給され、バインダーの添加なしで、操
作圧力０．５〜４ton/cm2 で該粒子の嵩密度０．８g/cm
3 以上とし、中間製品として取出される。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIG.
In a step of producing a titanium dioxide pigment by a gas phase oxidation reaction of titanium tetrachloride, a reaction gas A is separated into titanium dioxide particles and a by-product gas B by a solid-gas separation device 1. A countercurrent solid-gas contactor 2 is connected to the lower part of the solid-gas separation device 1, and the titanium dioxide particles containing a chlorine gas component are brought into countercurrent contact with an inert gas to roughly replace the chlorine gas. This contactor has an inner diameter of 30
cm and 2 m in length. The apparent descent rate of the titanium dioxide particles is 1-5 cm / sec. Sixteen holes each having a diameter of 4 mm are formed in the lower tube wall of the contactor, and an inert gas C is sprayed on the titanium dioxide particles at a speed of 5 to 20 cm / sec to roughly replace the chlorine gas including the upward flow. At this time, 700,000 ppm inlet chlorine gas concentration is removed up to about 30,000 ppm. The removal rate here is 9
0% or more. When the oxidation reaction is performed in a high-pressure system, the pressure-reducing container 4 is a device that shuts off the reaction system and lowers the pressure to the atmospheric pressure for the next operation. The operation is performed by opening and closing the valves 3, 5, and 6, in the order of closing the valves 5, 6 closed-3 open-3 closed-6 open-6 closed-5 open-5 closed as follows. The size of the vacuum vessel is determined by the size of the stirred fluidized bed and the method of supplying the titanium dioxide particles. Since the gas exhausted at the time of pressure reduction contains chlorine gas, it is subjected to absorption treatment in the absorption tower 12. The next stirred fluidized bed is made of transparent PVC having an inner diameter of 500 mm and a height of 2,500 mm, and the lower dispersion plate is provided with holes of 2 mm diameter at a pitch of 12 mm (opening ratio 2.5%). Stirrer airfoil is portal type, outer diameter is 485mm, height is 500mm, blade width is 75
mm blades, which rotate at 5 to 30 rotations / minute. When the titanium dioxide particles are set to a standing layer height of 500 to 1000 mm, air is used as the fluid gas D, and the particles are fluidized at a superficial velocity of 5 to 30 cm / sec, the chlorine gas has a residence time of 20 to 150 seconds. The concentration can be reduced to 0.05 ppm or less which does not hinder the handling of the titanium dioxide particles. Next, the titanium dioxide particles from which the chlorine gas has been removed are supplied to a general pressure roll type compressor 11, and the bulk density of the particles is reduced to 0 to 4 ton / cm 2 at an operating pressure of 0.5 to 4 ton / cm 2 without adding a binder. 8g / cm
3 or more and taken out as an intermediate product.
【００１７】[0017]
【発明の効果】本発明は、以上説明したように構成され
ているので、以下に記載されるような効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００１８】本発明のフレーク状二酸化チタン粉粒体
は、加圧成形体であって移送、貯蔵、包装、輸送などに
おける取扱い作業性が粒子粉末の場合に比べて容易であ
って、遠隔地などへのバルク輸送や、当該地での仕上処
理や加工処理での生産性の向上や高品質化を図る上で工
業的に有用である。The flaky titanium dioxide powder of the present invention is a press-formed product, and is easier to handle in transportation, storage, packaging, transportation, etc. than in the case of particle powder. It is industrially useful for improving the productivity and improving the quality in bulk transportation to the destination, finishing and processing in the area.
【００１９】本発明のフレーク状二酸化チタン粉粒体
は、塩素ガスなどの有害成分ガスが除去されており、該
ガスによる装置の腐食や酸化チタン顔料特性などの物性
阻害を排除し得る。The flaky titanium dioxide particles of the present invention are free from harmful component gases such as chlorine gas, and can eliminate physical corrosion such as corrosion of equipment and properties of titanium oxide pigment due to the gases.
【００２０】本発明のフレーク状二酸化チタン粉粒体
は、水性媒体系での分散性に優れ、これを用いて容易に
水性スラリーを得ることができる。The flaky titanium dioxide powder of the present invention is excellent in dispersibility in an aqueous medium system, and an aqueous slurry can be easily obtained by using this.
【００２１】本発明のフレーク状二酸化チタン粉粒体の
製造方法によれば、塩素ガスなどの有害成分ガスが残留
した二酸化チタン粒子粉末より、有害成分ガスを、比較
的簡便な手段で効率よくその実質的全部を除去できる。According to the method for producing flaky titanium dioxide powder of the present invention, harmful component gas is efficiently converted from titanium dioxide particle powder in which harmful component gas such as chlorine gas remains by relatively simple means. Substantially all can be removed.
【図１】図１は、本発明の実施に好適な処理装置構成の
一例を示す系統図である。FIG. 1 is a system diagram showing an example of a configuration of a processing apparatus suitable for implementing the present invention.
Ａ 気相反応ガス（含二酸化チタン粒子） Ｂ 副生ガス Ｃ 不活性ガス Ｄ 流動ガス １ 固−気分離装置 ２ 向流固−気接触器 ３，５，６ バルブ ４ 減圧容器 ７ 定量供給装置 ８ 攪拌流動層 ９ 攪拌翼 １０ 分散盤 １１ 加圧ロール圧縮成形機 １２ 吸収塔 A Gas-phase reaction gas (containing titanium dioxide particles) B By-product gas C Inert gas D Flowing gas 1 Solid-gas separator 2 Countercurrent solid-gas contactor 3, 5, 6 Valve 4 Decompression container 7 Quantitative supply device 8 Stirred fluidized bed 9 Stirrer blade 10 Dispersing plate 11 Press roll compression molding machine 12 Absorption tower
Claims (4)
素ガスを粒子重量に対して０．０５ppm 以下含有する二
酸化チタン粒子粉末を加圧成形して成る、嵩密度が０．
８ｇ／cm3 以上のフレーク状二酸化チタン粉粒体。1. A titanium dioxide particle powder obtained by subjecting titanium tetrachloride to gas phase oxidation and containing chlorine gas of 0.05 ppm or less based on the weight of the particle, is formed by pressure molding.
8 g / cm 3 or more of flaky titanium dioxide powder.
ル圧縮荷重を０．５〜４ton/cm2 以上にして加圧成形し
た請求項１記載のフレーク状二酸化チタン粉粒体。2. The flake-form titanium dioxide powder according to claim 1, wherein said flake-like titanium dioxide powder is molded by using a pressure roll molding machine with the roll compression load of said molding machine being 0.5 to 4 ton / cm 2 or more.
素ガスを含有する二酸化チタン粒子粉末を、固−気接触
器に導入して不活性ガス流と向流接触させ、次いで攪拌
流動層に導入して塩素ガスを粒子重量に対して０．０５
ppm 以下になるまで除去処理し、しかる後処理粒子粉末
を加圧成形することを特徴とするフレーク状二酸化チタ
ン粉粒体の製造方法。3. A titanium dioxide particle powder containing chlorine gas, obtained by vapor-phase oxidation of titanium tetrachloride, is introduced into a solid-gas contactor to bring it into countercurrent contact with an inert gas stream, and then stirred. Introduce the chlorine gas into the fluidized bed at 0.05 wt.
A method for producing flaky titanium dioxide powder, comprising removing the particles until the concentration becomes less than ppm, and subjecting the post-treated particles to pressure molding.
ル圧縮荷重を０．５〜４ton/cm2 にして加圧成形する請
求項３記載のフレーク状二酸化チタン粉粒体の製造方
法。4. The method for producing flake-like titanium dioxide powder according to claim 3, wherein the pressing is performed by using a press roll forming machine with the roll compression load of the forming machine being 0.5 to 4 ton / cm 2. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36489997A JP3169351B2 (en) | 1994-09-21 | 1997-12-19 | Flake-like titanium dioxide powder and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36489997A JP3169351B2 (en) | 1994-09-21 | 1997-12-19 | Flake-like titanium dioxide powder and method for producing the same |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06254421A Division JP3091372B2 (en) | 1994-09-21 | 1994-09-21 | Solid particle powder treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10194741A true JPH10194741A (en) | 1998-07-28 |
| JP3169351B2 JP3169351B2 (en) | 2001-05-21 |
Family
ID=18482943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36489997A Expired - Lifetime JP3169351B2 (en) | 1994-09-21 | 1997-12-19 | Flake-like titanium dioxide powder and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3169351B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002316821A (en) * | 2001-04-12 | 2002-10-31 | Nippon Aerosil Co Ltd | Titanium dioxide containing chlorine in low content and method for producing the same |
| CN103880076A (en) * | 2013-12-09 | 2014-06-25 | 云南新立有色金属有限公司 | Titanium dioxide preparation system |
| CN103896333A (en) * | 2013-12-09 | 2014-07-02 | 云南新立有色金属有限公司 | Method for preparing titanium dioxide |
| CN106435201A (en) * | 2016-10-09 | 2017-02-22 | 云南冶金新立钛业有限公司 | Reaction system used for producing high titanium slag |
| WO2024101458A1 (en) * | 2022-11-10 | 2024-05-16 | 尾池工業株式会社 | Blue pigment, dispersion liquid, coating material, ink, and coating film and method for producing same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106082316A (en) * | 2016-08-19 | 2016-11-09 | 云南冶金新立钛业有限公司 | Titanium Dioxide Produced by Chloride Procedure boiling chloridizing furnace feed arrangement |
-
1997
- 1997-12-19 JP JP36489997A patent/JP3169351B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002316821A (en) * | 2001-04-12 | 2002-10-31 | Nippon Aerosil Co Ltd | Titanium dioxide containing chlorine in low content and method for producing the same |
| CN103880076A (en) * | 2013-12-09 | 2014-06-25 | 云南新立有色金属有限公司 | Titanium dioxide preparation system |
| CN103896333A (en) * | 2013-12-09 | 2014-07-02 | 云南新立有色金属有限公司 | Method for preparing titanium dioxide |
| CN106435201A (en) * | 2016-10-09 | 2017-02-22 | 云南冶金新立钛业有限公司 | Reaction system used for producing high titanium slag |
| WO2024101458A1 (en) * | 2022-11-10 | 2024-05-16 | 尾池工業株式会社 | Blue pigment, dispersion liquid, coating material, ink, and coating film and method for producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3169351B2 (en) | 2001-05-21 |
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