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Title:
METHOD FOR MANUFACTURING BENTONITE MOLDED BODY
Document Type and Number:
Japanese Patent JP2016141141
Kind Code:
A
Abstract:
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

Inventors:
ISHII TAKU
ISHII SO
Application Number:
JP2015021466A
Publication Date:
August 08, 2016
Filing Date:
February 05, 2015
Export Citation:
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Assignee:
SHIMIZU CONSTRUCTION CO LTD
International Classes:
B28B11/00; C04B33/30; G21F9/36
Domestic Patent References:
JP2011242289A2011-12-01
JPH05124849A1993-05-21
JP2009274910A2009-11-26
JP2010143146A2010-07-01
JP2015206736A2015-11-19
JPS5138299A1976-03-30
JP2011242289A2011-12-01
JPH05124849A1993-05-21
JP2009274910A2009-11-26
JP2010143146A2010-07-01
JP2015206736A2015-11-19
JPS5138299A1976-03-30
Other References:
JPN6016018884; 中島均　他２名: '「高密度で真球度が高いベントナイトペレットの製造方法」' 日本原子力学会　２０１３年春の年会 , 2013, Ａ１９
JPN6016018882; 中島均　他２名: '「乾燥収縮を利用したベントナイトペレットの製造方法」' 原子力バックエンド研究 Ｖｏｌ．２１　Ｎｏ．２, 2014, ｐ．８３-９４
JPN6016018880; 中島均　他１名: '湿潤ベントナイトペレットの２段階乾燥実験' 土木学会平成２６年度全国大会第６９回年次学術講演会講演概要集 , 2014, ｐ．４１-４２
JPN6016018880; 中島均　他１名: '湿潤ベントナイトペレットの２段階乾燥実験' 土木学会平成２６年度全国大会第６９回年次学術講演会講演概要集 , 2014, ｐ．４１-４２
JPN6016018884; 中島均　他２名: '「高密度で真球度が高いベントナイトペレットの製造方法」' 日本原子力学会　２０１３年春の年会 , 2013, Ａ１９
JPN6016018882; 中島均　他２名: '「乾燥収縮を利用したベントナイトペレットの製造方法」' 原子力バックエンド研究 Ｖｏｌ．２１　Ｎｏ．２, 2014, ｐ．８３-９４
Attorney, Agent or Firm:
Hiroaki Sakai



 
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