Studies on the Production and the Utilization of Regenerated Humic Acids (I):Preparation of Regenerated Humic Acids by Oxidation of Bituminous Coals with Nitric Acid

概要

論文の詳細を見る
In order to obtain regenerated humic acids from bituminous coals, six kinds of coals-Takamatsu (C: 75.7%), Onoura (C: 80.1%), Miike (C: 82.3%), Hashima (C: 85.0%), Shin-omine (C: 87.1%) and Nishikawachi (C: 89.5%) were oxidized with nitric acid under various conditions. In the case of Miike coal, a maximal yield of humic acid (based on original coal) was obtained at the oxidation time about 14 hours with 1 normal nitric acid and about 6 hours with 2 normal nitric acid at 100°C. On the oxidation of bituminous coals with 2 normal nitric acid in 5 hours at 100°C, the yield of humic acids depended upon the rank of coals. Under these conditions coal containing about 84% carbon gave a maximal yield of humic acid. To prepare humic acids in good yiels from coals of the higher rank, it was necessary to employ the more drastic oxidation conditions.<BR>Carbon, hydrogen and nitrogen contents, neutralization equivalent weights and cadmium ion uptakes of humic acids that regenerated from bituminous coals were determined.
一般社団法人日本エネルギー学会の論文