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Namely, clay can be classified into various kinds such as bentonite, acid clay, active clay, kaolin clay, sericite, pyrofilament and montmorillonite,
they have diverse features ( swellingness, adhesiveness, absorptiveness, catalytic property, plasticity, heat-hardeningness, brightness, suspending property, malleability, alleviativeness, detoxification, base-exchanging, etc ).
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