中南大学学报（自然科学版）2011，Vol.42Issue(10)：2911-2916,6.
采用湿式氧化法脱除铝酸钠溶液中硫的研究
Desulfurization from sodium aluminate solution by wet oxidation
摘要
Abstract
Based on the fact that the iron content in alumina products is associated with bivalent sulfur ions in aluminate solution, the wet oxidation was used to remove the bivalent sulfur ions in high pressure autoclave. The influence of various conditions on the removal of S2- and the oxidation mechanism was investigated. The results show that the removal efficiency of bivalent sulfur ions is affected by the oxygen pressure inside the reactor, reaction temperature, and reaction time. The optimum conditions for wet oxidation is as fallows. The reaction temperature is 200 °C, the oxygen pressure is 3.0 Mpa, S2- concentration is 31.2 mmol·L-1. Under these conditions, the removal rate of S2- is 99%. At high temperature and pressure, the majority of S2- in aluminate solution is oxidized to SO42-, and only a small part of S2-is oxidized to thiosulfate, sulflte and other forms of sulfur. Conversion of S2"to SO42- is mainly affected by the oxygen pressure and reaction temperature. When the temperature is 260 °C, and the oxygen pressure reaches 1.0 Mpa, more than 98% of S2- is oxidized to SO42-.关键词
湿式氧化法/拜耳法/铝酸钠溶液/脱硫Key words
wet oxygen oxidation/ Bayer process/ sodium aluminate solution/ desulfurization分类
矿业与冶金引用本文复制引用
胡小莲,陈文汨..采用湿式氧化法脱除铝酸钠溶液中硫的研究[J].中南大学学报（自然科学版）,2011,42(10):2911-2916,6.基金项目
国家自然科学基金资助项目(20971041) （20971041）
湖南省教育基金资助项目(09B032) （09B032）
