氧化铁的制备和包覆

摘要

随着高科技的快速发展和对新材料迫切需要，氧化铁制备技术及应用开发已经越来越得到重视。为此叙述了氧化铁制备方法，分析了不同制备工艺优缺点。采用酸浸法来处理高硅铁尾矿，从而制备工业原料 Fe₂O₃，其最佳工艺条件是: 反应时间90min，反应温度在100℃，铁尾矿中粒径为6.19µm，其盐酸的体积分数为60%。制备Fe₂O₃产率(所得产品中Fe₂O₃的质量占原来铁尾矿中Fe₂O₃质量的比例)为79%，其品质符合国标中氧化铁红颜料要求。采用凝胶-溶胶法在氧化铁的表面包覆纳米二氧化硅来对其进行改性。使用红外光谱来确定二氧化硅是否已经包覆于氧化铁的表面。氧化铁被纳米二氧化硅包覆后，其表面有纳米材料特性，提高了氧化铁的疏水性和耐热性，所以极大地增强涂层耐腐蚀性能。

关键词：氧化铁；高硅铁尾矿；制备；纳米二氧化硅；包覆

Abstract

With the rapid development of high technology and new materials for urgent need, iron oxide preparation technology and application development already more and more get attention. For this describes the iron oxide preparation method, this paper analyzes the advantages and disadvantages of different preparation process. The acid leaching to deal with high ferrosilicon tailings, and industrial raw materials preparation Fe₂O₃, the optimum technological conditions is: 90 min reaction time, reaction temperature in 100 ℃, the iron tailings of particle size of 6.19 µm, its volume fraction of hydrochloric acid for 60%. Preparation Fe₂O₃ yield (income in the quality of the products of Fe₂O₃ for iron tailings of Fe₂O₃ quality ratio) was 79%, the quality of iron oxide red pigment oxidation meet the national requirements. The gel-sol method in the surface of the iron oxide coated the nano-silica on modification. Use infrared spectrum to determine whether the silica coated in iron oxide has the surface. Iron oxide coated by nano-silica, its surface is nano material characteristics, improve the iron oxide of hydrophobic and heat resistance, so greatly enhance coating corrosion resistance performance.

Keywords: iron oxide; High ferrosilicon tailings; Preparation; Nano-silica; coated
目录

2.2.2 溶胶−凝胶法(Sol-gel) 4