舒兰粘土矿中铁的赋存形式

舒兰粘土矿系高岭石型粘土矿,其中Fe_2O_3的含量达1.5～2.7％。经穆斯堡尔谱研究,有二对四极双峰,IS分别为0.450～0.462、0.425～0.439mm/s,QS分别为0.938～0.958、0.397～0.476mm/s。表明其中的铁基本都是高自旋的Fe~(3+),主要赋存于蒙脱石—囊脱石晶格的配位八面体中,M_1与M_2中均分布有铁,其原子比约为1:3。

STATE OF OCCURRENCE OF IRON IN CLAY FROM SHULAN, JILIN PROVINCE

The clay from Shulan mine field is of kaoline type with Fe2O3 content from 1.5 to 2.7% .According to Mossbauer spectral study the clay has twin quadrupole split doublets with the IS of 0.450-0.462mm/s and 0.425-0.439mm/s respectively, CS of 0.938-0.958 and 0.397-0.476mm/s respectively. It explains that Fe3+ it in high spin configuration and principally exists in coordination. octahedron of Montmorillonite-Nontronite lattice, M1 and M2 sites contain iron and the atom ratio in the proportion is about 1:3.