Research on the Mechanism of the Dissociation of Potassium Shale during roasting

摘要：

It was studied that the process and mechanism of potassium extraction from the potassium-rich shale sample during roasting via SEM, XRD and thermal analysis (TG and DSC). The result of roasting test shows that roasting size has a little affect on ratio of potassium extraction,however, the effect of roasting temperature, roasting time and mNaOH:mshale on potassium extraction is significant. Under the optimum conditions, the ratio of potassium extraction is more than 88 ％. SEM, XRD and thermal analysis shows that, during roasting, NaOH contributes to decomposition and melt of the minerals like potassium feldspar and muscovite in the sample and intact structure of minerals in the shale are broken down gradually and there are new crystal phases like kalsilite in the roasting products. Under alkali conditions, increasing roasting temperature promotes decomposition of silicate and aluminosilicate minerals.

关键词： potassium extraction potassium-rich shale roasting kalsilite

作者: Han Yuexin Liu Jie Yin Wanzhong

作者单位: School Of Resources and Civil Engineering,Northeastern University,Shenyang 110004,China

会议类型: 国际会议

会议名称: 2008国际粉体技术与应用论坛暨全国粉体产品与设备应用技术交流大会

会议地点: 北京

会议语种:英文

页码: 155-162

在线出版日期: 2008-04-01（万方平台首次上网日期，不代表论文的发表时间）