ベンナイト関連製品の物性と応用

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Bentonite, intrinsically to be consider as colloidal substance, is applied for various industrial uses. In this presentation, the relations between the bentonite properties and several industrial requirements were elucidated. It is very important to consider the effect affected by the composition of exchangeable cations of bentonite in all uses. Ca-bentonite can be activated by Na-exchange treatment. Ca-bentonite has a law swelling power, while the activated one possesses high swelling power and in many ways it is, similar to naturally occured Na-bentonite. The property of bentonite used as binder in foundry sand is affected by the heat stability of montmorillonite which contained in the bentonite. Montmorillonite from Yamagata has a high regularity in layer stacking and the one from Wyoming is poor in regularity. The existence of interstratified clay mineral is detected in the bentonite from Wyoming. The formation of interstratified clay mineral is also in relation to the composition of exchangeable cations. The significant difference in salty resistance of drilling mud may be owing to the irregularity of layer stacking. Bentonite plays a role as active solid to agricultural organic chemicals. Some agricultural organic chemicals are decomposed remarkably by the coexistence of bentonite. Bentonite is also used as binder in, preparing clay-pellet and dominates the formation of pellet porosity. Hydro-purified smectite has been prepared by extraction from smectite ore. Some of its clay-organic derivatives are also prepared. Those derivatives can be mapped on matrix chart according to their clay mineral species and the kinds of positively charged organic radicals. Alsi-film, which is shaped by utility of film forming character of montmorillonite, is one of interesting material.
日本粘土学会の論文
1981-03-25

ベンナイト関連製品の物性と応用

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