摘要
以新疆哈密钾长石为原料,采用水热反应,研究了碱溶体系和磷矿—磷酸酸溶体系对哈密钾长石提钾工艺的影响。通过单因素及正交实验得出碱溶体系下最适宜提钾条件为:反应温度210℃、反应时间3.0h、钾长石∶NaOH1∶1.4(g/g)、钾长石与水的体积比1∶3(g/mL),可溶性钾的最大提取率为93.19%;磷矿—磷酸酸溶体系最适宜提钾条件为:反应温度260℃、磷酸质量分数85%、钾长石∶磷酸1∶4.5(g/mL)、钾长石∶磷矿1∶0.25(g/g)、反应时间3.5h,可溶性钾的最大提取率为91.48%。提钾后的残渣的XRD分析结果显示,两种工艺条件下钾长石的主衍射峰均消失,表明钾长石已基本分解。提钾工艺比较性研究表明,哈密钾长石在碱溶体系具有较高的提钾率,工艺条件相对简单。
Under hydrothermal conditions, the effect on extraction of potassium from potash feldspar of Xinjiang Hami was studied in alkali soluble system and phosphate-phosphoric acid soluble system, respectively. The results of single factor and orthogonal experiments showed that the optimum conditions for extracting potassium in alkali soluble system were as follows： reaction temperature was 210 C. reaction time was 3.0 h, mass ratio of potash feldspar to NaOH was 1 ： 1.4（g/g）. volume ratio of potash feldspar to water was I ： 3（g/mL）, and the maximum extraction rate of the potassium was 93.19; while in acid soluble system, the reaction temperature was 250 C, phosphoric acid concentration was 65; （m;）, volume ratio of potassium feldspar to phosphoric acid was 1 t 4.5（g/mL）, mass ratio of potash feldspar to phosphorite was 1 ： 0.25（g/g）, reaction time was 3. 5 h, and the maximum extraetion rate of the potassium was 91.48;, The XRD diffraction analysis of the residue showed that the major diffraction peak of potash feldspar disappeared under the above two technologies, which indicated the potash feldspar was decomposed. The comparative study showed that the higher extracting rate was obtained in alkali soluble system, and the technique condition was relatively simple.
出处
《化工矿物与加工》
CAS
北大核心
2012年第12期12-16,共5页
Industrial Minerals & Processing
基金
2011年新疆兵团科技攻关项目(2011BA023)
2011年北京化工大学化工资源有效利用国家重点实验室开放课题(CRE-2011-C-203)
关键词
钾长石
水热法
碱溶
酸溶
提钾工艺
potash feldspar
hydrothermal method
alkali soluble
acid soluble
extraction technology of potassium
