公开(公告)号：US3900422A

公开(公告)日：1975-08-19

申请号：US40064573

申请日：1973-09-25

Applicant: AGENCY IND SCIENCE TECHN

Inventor： TERAJIMA KAZUKI ,  TOMITA SHIGERU ,  MATSUDA YOSHINDO ,  ABE KEIJI

IPC: B01J20/22 ,  C02F1/28 ,  C02F9/00 ,  C02B1/52

CPC classification number: C02F1/286 ,  B01J20/22 ,  C02F2101/20 ,  C22B3/24 ,  Y02P10/234

Abstract: Heavy metal adsorbents comprising granules of a mixture of nitrohumic acid and at least one binder selected from the group consisting of a carboxyl group-containing polymeric compound and a water-insoluble salt thereof. These heavy metal adsorbents are produced advantageously by either a process wherein a mixture of nitrohumic acid and a carboxyl group-containing polymeric compound is kneaded with an aqueous solution of alkali and the kneaded mixture is first subjected to an acid treatment and then shaped into granules, or a process wherein nitrohumic acid and a carboxyl group-containing polymeric compound are dissolved in an aqueous solution of alkali, the solution is acidified to form a precipitate and then the precipitate is separated and shaped into granules. The granular products thus obtained can be further improved in mechanical strength by means of a heat treatment.