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METHOD FOR MANUFACTURING BENTONITE MOLDED BODY
PROBLEM TO BE SOLVED: To provide a method for manufacturing a bentonite molded body which can shorten drying time, when dry-shrinkage is promoted under a drying rate condition corresponding to grain size of pellets.SOLUTION: Provided is a method for producing a high-density, nearly spherical bentonite molded body, comprising adding water to bentonite powder and kneading the mixture; and drying and shrinking a wet pellet obtained by rounding the kneaded mixture nearly spherically. The method comprises a drying process where a drying rate condition is set so that the drying rate condition of a pellet, v D, becomes 80 or less, when a value calculated by v=(w-w)/t from a value of drying time t (Hr) required for a moisture content ratio to change from an initial ratio wto a ratio won the way to drying is denoted as a moisture content decreasing rate v (1/Hr), where an average diameter of the pellet is denoted by D (mm) and the moisture content ratio by an actual value. Drying by the drying step is speeded up by blowing a high temperature and/or a large amount of air at a point of time when the moisture content ratio of the pellet becomes smaller than 0.10 to 0.15.SELECTED DRAWING: Figure 6
【課題】ペレットの粒径に応じた乾燥速度条件で乾燥収縮を進める場合において、乾燥時間を短縮可能なベントナイト成形体の製造方法を提供する。【解決手段】ベントナイト粉体に水を添加して混練し、これを略球状に丸めた湿潤ペレットを乾燥収縮させて高密度の略球状のベントナイト成形体を製造する方法であって、ペレットの平均直径をＤ（ｍｍ）で、含水比を実数値で表して、乾燥する際の乾燥条件を、初期含水比ｗ０と乾燥途中の含水比ｗ１に至る乾燥時間ｔ（Ｈｒ）の値からｖ＝（ｗ０−ｗ１）／ｔで算出した値を含水比低下速度ｖ（１／Ｈｒ）とした場合に、ペレットの乾燥速度条件ｖ・Ｄ３が８０以下となるような乾燥速度条件にする乾燥工程を有し、ペレットの含水比が０．１０〜０．１５よりも小さくなった時点で、高温またはおよび多量の空気を送風することで乾燥工程による乾燥を高速化するようにする。【選択図】図６
METHOD FOR MANUFACTURING BENTONITE MOLDED BODY
PROBLEM TO BE SOLVED: To provide a method for manufacturing a bentonite molded body which can shorten drying time, when dry-shrinkage is promoted under a drying rate condition corresponding to grain size of pellets.SOLUTION: Provided is a method for producing a high-density, nearly spherical bentonite molded body, comprising adding water to bentonite powder and kneading the mixture; and drying and shrinking a wet pellet obtained by rounding the kneaded mixture nearly spherically. The method comprises a drying process where a drying rate condition is set so that the drying rate condition of a pellet, v D, becomes 80 or less, when a value calculated by v=(w-w)/t from a value of drying time t (Hr) required for a moisture content ratio to change from an initial ratio wto a ratio won the way to drying is denoted as a moisture content decreasing rate v (1/Hr), where an average diameter of the pellet is denoted by D (mm) and the moisture content ratio by an actual value. Drying by the drying step is speeded up by blowing a high temperature and/or a large amount of air at a point of time when the moisture content ratio of the pellet becomes smaller than 0.10 to 0.15.SELECTED DRAWING: Figure 6
【課題】ペレットの粒径に応じた乾燥速度条件で乾燥収縮を進める場合において、乾燥時間を短縮可能なベントナイト成形体の製造方法を提供する。【解決手段】ベントナイト粉体に水を添加して混練し、これを略球状に丸めた湿潤ペレットを乾燥収縮させて高密度の略球状のベントナイト成形体を製造する方法であって、ペレットの平均直径をＤ（ｍｍ）で、含水比を実数値で表して、乾燥する際の乾燥条件を、初期含水比ｗ０と乾燥途中の含水比ｗ１に至る乾燥時間ｔ（Ｈｒ）の値からｖ＝（ｗ０−ｗ１）／ｔで算出した値を含水比低下速度ｖ（１／Ｈｒ）とした場合に、ペレットの乾燥速度条件ｖ・Ｄ３が８０以下となるような乾燥速度条件にする乾燥工程を有し、ペレットの含水比が０．１０〜０．１５よりも小さくなった時点で、高温またはおよび多量の空気を送風することで乾燥工程による乾燥を高速化するようにする。【選択図】図６
METHOD FOR MANUFACTURING BENTONITE MOLDED BODY
ベントナイト成形体の製造方法
ISHII TAKU (author) / ISHII SO (author)
2016-08-08
Patent
Electronic Resource
Japanese
IPC:
B28B
Formgeben von Ton oder anderen keramischen Stoffzusammensetzungen, Schlacke oder von Mischungen, die zementartiges Material enthalten, z.B. Putzmörtel
,
SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
/
C04B
Kalk
,
LIME
/
G21F
Schutz gegen Röntgenstrahlung, Gammastrahlung, Korpuskularstrahlung oder Teilchenbeschuss
,
PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT
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