Process for the production of granular metal-capturing agents for treating waste effluents containing heavy metals
AssigneeDirector-General of Agency of Industrial Science and Technology
InventorsNakaji Yuki, Akio Yauchi
Life of this patent
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Abstract
Granular metal-capturing agents suitable for treating waste effluents conning heavy metals are obtained by mixing 100 parts by weight of waste clay which has been subjected to a preliminary dry distillation treatment with 25-40 parts by weight of an organic carbonaceous binder agent such as coking coal, granulating 100 parts by weight of this mixture together with 8-15 parts by weight of an organic pelletizing agent such as sulfite pulp waste liquor, and thereafter subjecting the resulting granules to a dry distillation treatment conducted at 450.degree.-900.degree. C.
Claims5
A process for the production of granular metal-capturing agents for treating waste effluents containing heavy metals, characterized by subjecting a waste clay from an oil purification treatment to a preliminary dry distillation treatment to reduce the oil content thereof to less than 10%, mixing 100 parts by weight of said treated waste clay with 25-40 parts by weight of an organic carbonaceous binding agent, pelletizing 100 parts by weight of this mixture together with 8-15 parts by weight of an organic pelletizing agent, and thereafter subjecting the resultant granules to a dry distillation treatment conducted at 450.degree.-900.degree. C for a time of at least 1 hour.
Dependencies are inferred from the claim text.