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研究了从低品位铷矿中回收铷的工艺流程,试图提高铷回收率、降低生产成本。将经过焙烧处理的氧化铷熟矿用苛性碱溶液浸出氧化铷,浸出液为铷盐溶液,在浸出过程中研究Na OH浓度、温度、浸出时间、液固比及碱液循环次数对氧化铷浸出率的影响。研究结果表明:Rb2O浸出率随着碱浓度增加而增大,当碱液浓度达到0.125 mol·L-1时,Rb2O浸出率达到80%以上;温度从20℃升高到80℃时,Rb2O浸出率从62%增加到90%,但温度从40℃升高到80℃时,Rb2O浸出率维持在91%左右;随着浸出时间、液固比的增加,Rb2O浸出率也不断增大,当浸出时间超过5 min及液固比大于4时,Rb2O浸出率低于92%;碱液循环浸出熟矿4次以内时,Rb2O浸出率不变,大于4次浸出率逐渐下降。在Na OH浓度为0.125 mol·L-1、浸出温度为40℃、液固比为4∶1、浸出时间为5 min、碱液循环浸出氧化铷熟矿4次的条件下,氧化铷浸出率达90%。该工艺为工业化生产提供基础理论依据。
The process of recovering rubidium from low-grade rubidium ore was studied in an attempt to improve the rubidium recovery rate and reduce the production cost. The roasted rubidium oxide mine is leached with rubidium oxide by caustic solution and the leachate is rubidium salt solution. The leaching rate of NaR, concentration of NaOH, temperature, leaching time, liquid-solid ratio, Impact. The results show that the leaching rate of Rb2O increases with the increase of alkali concentration. When the concentration of alkali reaches 0.125 mol·L-1, the leaching rate of Rb2O reaches above 80%. When the temperature rises from 20 ℃ to 80 ℃, The rate of Rb2O leaching increased from 62% to 90%. However, the Rb2O leaching rate was maintained at about 91% when the temperature was increased from 40 ℃ to 80 ℃. With the increase of leaching time and liquid-solid ratio, the Rb2O leaching rate also increased. When the leaching time exceeds 5 min and the liquid-solid ratio is greater than 4, the leaching rate of Rb2O is less than 92%. When the leaching cycle of alkaline liquor is within 4 times, the leaching rate of Rb2O remains unchanged. Under the conditions of NaOH concentration of 0.125 mol·L-1, leaching temperature of 40 ℃, liquid-solid ratio of 4:1, leaching time of 5 min and lye leaching cycle of rubidium fortuneite four times, the leaching rate of rubidium oxide Up to 90%. The process provides the theoretical basis for industrial production.