The products of mixed rare earth minerals containing monazite and bastnaesite calcined by CaO-NaCl-CaCl2 contained calcium phosphate and phosphorite. In this paper, HCl-H3cit solution was used to wash the calcination ...The products of mixed rare earth minerals containing monazite and bastnaesite calcined by CaO-NaCl-CaCl2 contained calcium phosphate and phosphorite. In this paper, HCl-H3cit solution was used to wash the calcination products, and the kinetic character of dissolved phosphorus was studied. The results showed that the reaction rate control changed from chemical reaction control mode to mixed control mode and diffusion control mode with increasing temperature, and the activation energy were 7.36, 27.64 and 61.27 kJ·mol-1, respectively. The change of temperature, the reagent concentration and stirring speed were studied in order to increase the dissolution rate of phosphorus. Phosphorus and rare earth in the calcination products could be separated in this process applicable to the rare earth recovery in phosphorite containing the rare earth.展开更多
2月26日,将近50名来自广州及周边城市的学员齐聚《家庭影院技术》杂志社,一起参加本年度首场CEDIA/CIT影音智能专业培训。本次培训为期两天,首日核心课程是与CEDIA国际同步的《Immersive Audio-Unified 3D Speaker Layouts for Multiple...2月26日,将近50名来自广州及周边城市的学员齐聚《家庭影院技术》杂志社,一起参加本年度首场CEDIA/CIT影音智能专业培训。本次培训为期两天,首日核心课程是与CEDIA国际同步的《Immersive Audio-Unified 3D Speaker Layouts for Multiple Listeners沉浸式音效:构建统一的3D声场布局》,由米乐影音董事总经理张声乐担任主讲讲师。在课程开始之前,课程的撰写人同时也是CEDIA全球特派讲师Tom Garrett特地以视频的形式,为到场学员简要介绍了课程的主要板块和设计要点。展开更多
基金the National Natural Science Foundation of China (50574031)
文摘The products of mixed rare earth minerals containing monazite and bastnaesite calcined by CaO-NaCl-CaCl2 contained calcium phosphate and phosphorite. In this paper, HCl-H3cit solution was used to wash the calcination products, and the kinetic character of dissolved phosphorus was studied. The results showed that the reaction rate control changed from chemical reaction control mode to mixed control mode and diffusion control mode with increasing temperature, and the activation energy were 7.36, 27.64 and 61.27 kJ·mol-1, respectively. The change of temperature, the reagent concentration and stirring speed were studied in order to increase the dissolution rate of phosphorus. Phosphorus and rare earth in the calcination products could be separated in this process applicable to the rare earth recovery in phosphorite containing the rare earth.
文摘2月26日,将近50名来自广州及周边城市的学员齐聚《家庭影院技术》杂志社,一起参加本年度首场CEDIA/CIT影音智能专业培训。本次培训为期两天,首日核心课程是与CEDIA国际同步的《Immersive Audio-Unified 3D Speaker Layouts for Multiple Listeners沉浸式音效:构建统一的3D声场布局》,由米乐影音董事总经理张声乐担任主讲讲师。在课程开始之前,课程的撰写人同时也是CEDIA全球特派讲师Tom Garrett特地以视频的形式,为到场学员简要介绍了课程的主要板块和设计要点。