| With the rapid development of today's advanced technology and its applications,rubidium and cesium based on its easy to ionization have begun to be applied to a wide range of key technologies in aerospace, medical equipment, electronic information, new energy development and so on. It also has become an important element of sophisticated technological development, its application shows a perfect future.Rubidium and cesium was associated in dolomite containing lithium, the content of rubidium and cesium were over to 0.2%, achieved the value of the industrial extraction. However, dolomite was only used to as extracting lithium mineral at present, ignored the extraction of rubidium and cesium. This paper synthetically recycled rubidium and cesium. The extraction of rubidium and cesium in dolomite were studied.The processing method of modifying dolomite containing with rubidium and cesium was investigated. The influence of ratio of compound additive, ratio of dolomite with compound, calcination temperature and calcination time were examined. The reaction mechanism was researched by the study of the XRD analysis of ores and calcination product. The influence of various factors on the calcination was explored by making orthogonal experiment on roasting process and the best calcination conditions were found. The optimum calcination conditions are that the ratio of compound additive is 1.5:1, the ratio of dolomite with compound is 2.3:1, the calcination temperature is 800?,the calcination time is 25 min. At the optimum conditions,the leaching of rubidium is 90.31%. the leaching of cesium is 90.83%,theleaching of postassium is 72.87%.The modified dolomite was leached using water acid at normal atmosphere. The influence of temperature, leaching time and liquid-solid ratio on leaching of rubidium and cesium from modified dolomite were examined. The leaching mechanism was researched by the study of the XRD analysis of leaching residue. The influence of various factors on the leaching was explored by making orthogonal experiment on leaching process and the best leaching conditions was found. The optimum leaching conditions are that temperature is 80?,leaching time is 180 min, liquid-solid ratio is3:1. The leaching of rubidium is 91.00%, the leaching of cesium is 91.27%,the leaching of postassium is 88.81%.The removing impurity experiment on leaching liquid was researched by using sodium carbonate as agent. The results show that the optimum removing impurity conditions are that removing impurity temperature is 85?, the removing impurity time is 60 min, the excessive coefficient of agent is 1.2, the precipitation rate of calcium is 99.94%.The way of extraction separation from low concentration solution with rubidium and cesium was researched by using Xylene as diluent. The influence of concentration of alkali, concentration of t-BAMBP in xylene, organic-liquid ratio and extraction time were examined. The results show that the optimum extraction separation conditions are that the concentration of alkali is 0.2mol/L, the concentration of t-BAMBP is 1, mol/L, the organic-liquid ratio is 0.7, and the extraction time is 60 seconds. The extraction of cesium is 95.21% and the Separation factor is 23.12.The way of extraction separation from low soncentration solution with rubidium and postassium was researched by using Kerosene as diluent. The influence of concentration of alkali, concentration of t-BAMBP in xylene and organic-liquid ratio were examined. The results show that the optimum extraction separation conditions are that the concentration of alkali is 0.2mol/L,the concentration of t-BAMBP is0.7mol/L and the organic-liquid ratio is 2. The extraction of rubidium is 95.37% and the Separation factor is 201.90. |
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