JP5835731B2 - 湿式分級方法及び湿式分級装置 - Google Patents
湿式分級方法及び湿式分級装置 Download PDFInfo
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Description
図1は、第1の実施形態に係る湿式分級装置を概念的に示した平面図である。図2は、図1に示す湿式分級装置のII−II線における縦断面図である。
次に、第2の実施形態について説明する。図9は、第2の実施形態に係る湿式分級装置を概念的に示した縦断面図である。
次に、第3の実施形態について説明する。図13は、第3の実施形態に係る湿式分級装置を概念的に示した縦断面図である。
(実施例1)
ビーズミルの周速:4.75m/s
ビーズミルの攪拌時間:20分間
印加電圧:30V
待ち時間:5000秒
(実施例2)
ビーズミルの周速:4.75m/s
ビーズミルの攪拌時間:20分間
印加電圧:30V
待ち時間:9000秒
(実施例3)
ビーズミルの周速:6.65m/s
ビーズミルの攪拌時間:30分間
印加電圧:30V
待ち時間:5000秒
(実施例4)
ビーズミルの周速:6.65m/s
ビーズミルの攪拌時間:30分間
印加電圧:30V
待ち時間:9000秒
(実施例5)
ビーズミルの周速:6.65m/s
ビーズミルの攪拌時間:30分間
印加電圧:30V
待ち時間:3000秒
(実施例6)
ビーズミルの周速:6.65m/s
ビーズミルの攪拌時間:30分間
印加電圧:30V
待ち時間:12000秒
実施例7では、まず、実施例4と同様の条件で分級を行い、粗粒子側のスラリーを回収した。その後、回収したスラリーを400mlに薄めて超音波により粒子を分散させ、再度、30Vの電圧を印加して分級を行い、9000秒間待った。実施例4及び7の部分分離効率Δη及び捕集効率Eを図20に示す。
実施例8では、実施例7において二回目の分級を行う際に、再度、スラリーをビーズミル処理し、その他の条件は実施例7と同様とした。実施例4及び8の部分分離効率Δη及び捕集効率Eを図21に示す。また、実施例4における原料及び製品の粒径分布を図22に示し、実施例8における原料及び製品の粒径分布を図23に示す。
Claims (10)
- スラリー中の粒子を分級する湿式分級装置であって、
スラリーが注入される槽と、
前記槽の上部に配置される上部電極と、
前記槽の下部に配置される下部電極と、
前記上部電極及び前記下部電極に電圧を印加する電圧制御部と、
前記槽に挿抜可能に挿入されて前記槽内を上下方向に仕切り、粒径の大きい粒子と粒径の小さい粒子とを分級する分級用仕切板と、
を有する、湿式分級装置。 - 前記槽に挿抜可能に挿入されて前記槽内を上下方向に仕切り、粒子が含まれるスラリー相と粒子が含まれない液相とを分離する仕切板を更に有する、
請求項1に記載の湿式分級装置。 - スラリー中の粒子を分級する湿式分級方法であって、
上部に上部電極が配置されるとともに下部に下部電極が配置された槽にスラリーを注入する注入工程と、
前記上部電極及び前記下部電極に電圧を印加し、分級を行う分級工程と、
を有し、
前記分級工程では、前記槽内を上下方向に仕切る仕切板を前記槽に挿入して、粒径の大きい粒子と粒径の小さい粒子とを分級する、
湿式分級方法。 - 前記注入工程では、前記槽の上下にスラリー相と粒子を含まない液相とを分離させ、
前記分級工程では、前記スラリー相と前記液相とを混合させる、
請求項3に記載の湿式分級方法。 - 前記スラリー相と前記液相の比重が同じである、
請求項4に記載の湿式分級方法。 - 前記注入工程の前に、ビーズミルで前記スラリーを攪拌する攪拌工程を有する、
請求項3〜5の何れか一項に記載の湿式分級方法。 - 前記攪拌工程では、分級目的の粒子よりも大粒径の核体粒子をビーズミルに添加する、
請求項6に記載の湿式分級方法。 - 前記核体粒子は、単分散の粒子である、請求項7に記載の湿式分級方法。
- 前記注入工程及び前記分級工程の一連のサイクルを、複数回繰り返す、
請求項3〜8の何れか一項に記載の湿式分級方法。 - 前記分級工程よる分級により、分級目的の粒子よりも大粒径の粒子の粒径の変動係数を3%以下とする、
請求項3〜9の何れか一項に記載の湿式分級方法。
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