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研究了锂云母碱溶法提锂新工艺。通过对碱液浓度、固液比、反应温度、反应时间等因素对锂云母中锂的转化率影响的研究,确立了碱溶法处理锂云母的最佳条件:强碱溶液质量分数为50%,锂云母与强碱液质量体积比(g/mL)为1∶3.5,反应温度为190℃,反应时间为4 h。在该条件下锂云母中锂的转化率可以达到98.2%。该方法主要优点:1)锂云母中的锂100%进入溶液;2)可以使提钾、提铯、提铷转化工序一次完成;3)因为是在碱性液体环境下反应,锂云母中的氟不会生成强腐蚀性的氢氟酸腐蚀设备;4)副产品是具有广泛用途的铝硅溶胶,通过铝硅溶胶的直接销售可以大大降低提锂成本。 相似文献
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Partition behavior of penicillins G and V was studied in a novel three-liquid-phase extraction system, which is composed of butyl acetate (BA), polyethylene glycol (PEG), ammonia sulfate [(NH4)2SO4] and water (H2O). The main components in the top, middle and bottom phases are butyl acetate, polyethylene glycol aqueous solution and ammonia sulfate aqueous solution, respectively. Some parameters such as partition coefficients Di/j and mass fractions Ei of penicillins G and V were determined at the room temperature, respectively. Experimental efforts have been made to investigate the partition behavior of penicillin in the three-liquid-phase extraction system, including initial concentrations of phase-forming components [PEG and (NH4)2SO4], PEG molecular weight, pH, initial concentration of penicillin. The results indicated that penicillins G and V have the similar partition behavior. They preferentially distribute into the middle phase with the increase of initial concentration of phase-forming components and into the top phase with the decrease of pH, while partition coefficient Dm/b is hardly affected by pH value. The variation of PEG molecular weight has little effect on mass fractions of penicillin. The increase of initial concentration of penicillins G and V could lead to the increase of Dt/b, Dm/b and the decrease of Dt/m, while their mass fractions in all phases were almost independent on their initial concentrations. 相似文献
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以甲基三乙氧基硅烷、二苯基硅二醇和乙烯基三乙氧基硅烷为原料首先合成出了有机硅树脂预聚体,然后将其添加到不饱和聚酯合成步骤中。通过有机硅预聚体上的硅羟基和乙氧基与不饱和聚酯上的羟基进行缩合反应来完成整个改性过程,最终制备出耐高温有机硅改性不饱和聚酯树脂。采用IR、TGA对不饱和聚酯改性前后的结构与性能进行了表征和分析。IR测试结果表明:有机硅树脂的分子结构成功的引入到不饱和聚酯树脂的分子链上。TGA测试结果表明:不饱和聚酯树脂经有机硅改性之后其起始分解温度从295℃上升到了340℃,耐热性能得到了显著的提高。此外,对有机硅改性前后不饱和聚酯树脂的体积电阻率和吸水率进行了测试,结果显示有机硅分子结构的引入不但可以提高不饱和聚酯树脂的耐热性能,还可以改善其电性能和防水性。 相似文献
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彩色珠光丝网印刷油墨 总被引:1,自引:0,他引:1
本文详细介绍了珠光颜料的种类和特性,以及珠洮油墨各组份的选择原则和配方工艺,并就珠光油墨组份中非金属云母钛珠光颜料合成工艺和操作条件以及对影响珠光光泽的因素作了较详尽的讨论,文中还提到珠光油墨印刷时应注意的几个问题。 相似文献