摘要
研究了有机相循环对铜萃取性能和萃余液夹带行为的影响。结果表明,当有机相循环次数从1次增加到10次,萃取分相速率从0.45 mm/s近乎线性地升高到0.61 mm/s,铜萃取率从99.8%线性微降至99.2%。前3次循环中,萃余液表面张力从52.9mN/m降低至41.3 mN/m,萃余液中有机相夹带比例由60%升高到80%,溶解比例相应由40%降低到20%,之后的循环中萃余液表面张力从41.3 mN/m升高到67.9 mN/m,夹带比例降低,溶解比例升高,最终比例接近1∶1。萃余液有机相含量在第3次循环时达到最高,COD值为604 mg/L。萃余液夹带是有机相流失规律的主导因素,对其控制是减少有机相流失的关键。
Effect of recycling use of organic phase on copper extraction rate and entrainment ot aqueous rattinate was studied. Results showed that as recycling times of organic phase increased from 1 to 10, the phase separation speed linearly increased from 0.45 mm/s to 0.61 mm/s, while copper extraction rate slightly decreased from 99.8% to 99.2%. In the first three times of recycling use, the surface tension of raffinate was reduced from 52.9 mN/m to 41.3 mN/m. The proportion of entrained organic chemicals to the total organic chemicals lost in the raffinate increased from 60% to 80%. Correspondingly the proportion of dissolved organic chemicals was reduced from 40% to 20%. However, after further recycling use of organic phase, the surface tension of raffinate increased from 41.3 mN/m to 67.9 mN/m, with an increase in both proportion of entrainment and the dissolved, finally around 1：1. The highest COD value of aqueous raffinate reached 604 mg/L on the third recycling time. The entrainment of organic phase, which contributes to the most of organic phase lose in the raffinate, is critical to be controlled for reducing organic phase lose.
出处
《矿冶工程》
CAS
CSCD
北大核心
2014年第1期61-64,69,共5页
Mining and Metallurgical Engineering
基金
国家自然科学基金资助项目(51074107)
上海市重点学科建设基金资助项目(J51504)
关键词
铜萃取
有机相循环
分相
萃取率
萃余液
夹带
copper solvent extraction
extraction-stripping loop
phase disengagement
extraction rate
raffinate
entrainment
