Micaceous iron oxide prepared from pyrite cinders by hydrothermal method  

作　　者：刘昭成 郑雅杰 

机构地区：[1]School of Metallurgical Science and Engineering,Central South University

出　　处：《Journal of Central South University》2011年第1期89-95,共7页中南大学学报（英文版）

基　　金：Project(2008A090300016) supported by Major Science & Technology Special Program of Guangdong Province,China

摘　　要：Micaceous iron oxide （MIO） with a hexagonal flaky shape was prepared by hydrothermal method. The ferric hydroxide used as precursor was obtained by an acidic leaching solution of pyrite cinders reacting with ammonia solution. The optimal experimental conditions for preparing micaceous iron oxide were investigated by orthogonal experiments. Micaceous iron oxide can be successfully prepared when optimal parameters of total iron concentration of 2.0 mol/L, pH value of 8, n（Fe2＋）/n（Fe3＋） of 0.1, mass of seed crystal of 1 g, reaction temperature of 260 ℃ and reaction time of 30 min are applied. X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and selected area electron diffractometry （SAEM） were adopted to characterize the hydrothermal products prepared under optimal conditions. The results indicate that highly crystallized α-Fe2O3 hexagonal flakes, about 1.0-1.5 μm in diameter and 0.1 μm in thickness, are prepared. Furthermore, the quality of micaceous iron oxide prepared can meet the required characteristics of micaceous iron oxide pigments for paints （ISO 10601--2007）.Micaceous iron oxide(MIO) with a hexagonal flaky shape was prepared by hydrothermal method.The ferric hydroxide used as precursor was obtained by an acidic leaching solution of pyrite cinders reacting with ammonia solution.The optimal experimental conditions for preparing micaceous iron oxide were investigated by orthogonal experiments.Micaceous iron oxide can be successfully prepared when optimal parameters of total iron concentration of 2.0 mol/L,pH value of 8,n(Fe2+)/n(Fe3+) of 0.1,mass of seed crystal of 1 g,reaction temperature of 260 °C and reaction time of 30 min are applied.X-ray diffractometry(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM) and selected area electron diffractometry(SAEM) were adopted to characterize the hydrothermal products prepared under optimal conditions.The results indicate that highly crystallized α-Fe2O3 hexagonal flakes,about 1.0-1.5 μm in diameter and 0.1 μm in thickness,are prepared.Furthermore,the quality of micaceous iron oxide prepared can meet the required characteristics of micaceous iron oxide pigments for paints(ISO10601-2007).

关 键 词：micaceous iron oxide hydrothermal method hexagonal flake pyrite cinders ferric hydroxide 

分 类 号：X756[环境科学与工程—环境工程]