仲钨酸铵在(NH4)2CO3-NH3?H2O-H2O体系中的溶解行为

来源期刊:中国有色金属学报(英文版)2018年第7期

论文作者:李小斌 郜春辉 周杰 周秋生 齐天贵 刘桂华 彭志宏

文章页码:1456 - 1464

关键词:仲钨酸铵;溶解行为;碳酸铵;氨水;焦绿石型三氧化钨

Key words:ammonium paratungstate; dissolving behavior; ammonium carbonate; ammonia; pyrochlore -type tungsten trioxide

摘    要:研究(NH4)2CO3-NH3?H2O-H2O体系中温度、氨水浓度和碳酸铵浓度对仲钨酸铵(APT·4H2O)溶解行为的影响。结果表明:当温度低于90 °C时,随着温度的升高、时间的延长、氨水浓度的增加和碳酸铵浓度的降低,APT·4H2O溶解量增大;而当温度高于100 °C时,溶解过程中APT·4H2O溶解量先升高再下降;当温度低于90 °C时,未溶解物仍以APT·4H2O形态存在;当温度高于100 °C时,未溶解物则主要以焦绿石型三氧化钨(WO3·5H2O)形态存在;溶解过程中,APT·4H2O先溶解为仲钨酸根离子继而部分转变为正钨酸根离子,最终溶液中正钨酸根离子和仲钨酸根离子共存。该研究可为APT·4H2O生产新工艺的开发和WO3·5H2O的制备提供新思路。

Abstract: The effects of temperature, ammonia concentration and ammonium carbonate concentration on the dissolving behavior of ammonium paratungstate were studied in (NH4)2CO3-NH3?H2O-H2O system. The results show that rising temperature, prolonging duration, increasing ammonia concentration and decreasing ammonium carbonate concentration favor dissolving of ammonium paratungstate at temperature below 90 °C, while the WO3 concentration decreases after a certain time at temperature above 100 °C. Furthermore, the undissolved tungsten exists in the form of either APT·4H2O below 90 °C or pyrochlore-type tungsten trioxide above 100 °C. In dissolving process, the ammonium paratungstate dissolves into paratungstate ions followed by partially converting to tungstate ion, resulting in the coexistence of the both ions. This study may provide a new idea to exploit a novel technique for manufacturing ammonium paratungstate and pyrochlore-type tungsten trioxide.

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 主办 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(湘)字第028号   湘ICP备09001153号