摘要
以鸟粪石沉淀法同时资源化回收模拟压裂返排液中的铵钾镁。首先研究了不同因素对鸟粪石回收效率的影响,探究了其它共存离子以及碳酸钠预处理钙的影响;然后使用正交实验优化回收工艺条件,最后对最佳条件下的回收产物表征分析。结果表明,鸟粪石沉淀反应较快,能在20 min达到平衡,适当增加初始pH、镁磷比、磷氮比和晶种量能提高回收效率;发现Na~+影响较小,而Ca^(2+)产生较大不利影响,通过添加碳酸钠预处理钙的方法能有效提高回收率;正交实验得到的最佳回收条件(pH=10.5、Mg/(N+K)/P=1.1/1/1.3、晶种量=1.2 g/L)下铵回收率最高为99.30%;SEM-EDS、XRD、FTIR表征分析表明鸟粪石成功回收。可为压裂返排液的无害化、资源化处理提供参考。
Struvite precipitation method was used to recover ammonium,potassium and magnesium from simulated fracturing flowback.Firstly,the effects of different factors on the recovery efficiency of struvite were studied,and the effects of other coexisting ions and sodium carbonate pretreatment of calcium were investigated.Then the orthogonal test was used to optimize the recovery process conditions,and finally the characterization of the recovered products under the best conditions was analyzed.The results show that the precipitation reaction of struvite is fast and can reach the equilibrium in 20 min.The recovery efficiency can be improved by appropriately increasing the initial pH,the ratio of magnesium to phosphorus,the ratio of phosphorus to nitrogen and the amount of crystal seed.It was found that Na+had little effect,while Ca^(2+)had a greater adverse effect.The recovery rate of calcium was effectively improved by adding sodium carbonate to pretreat calcium.Under the optimal recovery conditions(pH=10.5,Mg/(N+K)/P=1.1/1/1.3,seed amount=1.2 g/L)obtained by orthogonal test,the highest recovery rate of ammonium was 99.30%.SEM-EDS,XRD and FTIR analysis showed that struvite was recovered successfully.This study can provide reference for harmless and resource treatment of fracturing flowback fluid.
作者
陈江豪
谢慧嘉
何刚
张政
丁玲
陈武
刘凯文
CHEN Jianghao;XIE Huijia;HE Gang;ZHANG Zheng;DING Ling;CHEN Wu;LIU Kaiwen(School of Chemistry and Environmental Engineering,Yangtze University,Jingzhou 434023,China;HSE Key Laboratory of Petro China Company Limited(Yangtze University),Jingzhou 434023,China;PetroChina Changqing Oilfield Company,Xi’an 710000,China;PetroChina Jianghan Machinery Research Institute Co.,Ltd.,Wuhan 430074,China)
出处
《应用化工》
CSCD
北大核心
2024年第12期2873-2879,共7页
Applied Chemical Industry
基金
国家科技重大专项课题(2016ZX05040-003)
中国石油天然气集团有限公司科研与技术开发项目(2021DJ6606)。
关键词
压裂返排液
资源化回收
脱盐
鸟粪石沉淀法
复合缓释肥
fracturing flowback fluid
resource recycling
desalination
struvite precipitation
compound slow-release fertilizer
