油气田采出水提锂技术研究

Research on technology for lithium extraction from oil and gas field produced water

为减少油气田采出水回注时锂元素的浪费,探索油气田采出水提锂的相关技术,在西南某油气田针对含硫、含油、含悬浮物等复杂水质的提锂技术进行了相关研究,选取了气浮除油+气提脱硫+催化氧化+絮凝沉降+两级过滤的预处理工艺路线和吸附提锂+膜分离浓缩+沉锂的提锂技术路线,研发出中国首套准工业化油气田采出水提锂中试装置。经性能考核,提锂中试装置锂整体回收率大于70%,碳酸锂的产品纯度达到99.2%以上,各项指标均满足碳酸锂工业品的要求。提锂中试装置的成功试运行可为以后油气田采出水提锂装置的工业化建设起到借鉴作用。

In order to reduce the wastage of lithium element in produced water reinjection of oil and gas field,the relevant technologies of extracting lithium from produced water of oil and gas field is explored.The project team carried out relevant research on lithium extraction technologies for complex water quality containing sulfur,oil and suspended solids in an oil and gas field in Southwest China.The pretreatment process consists of air floatation,air extraction desulfurization,catalytic oxidation,flocculation and sedimentation,and ends with two-stage filtration.The process of lithium extraction by adsorption,membrane separation and concentration,and lithium precipitation was selected,leading to a pilot plant for lithium extraction from produced water in oil and gas field.This quasi-industrial pilot plant is the first one in China for extracting lithium from produced water of oil and gas field.And after performance evaluation,the overall recovery of lithium ion is more than 70%,and the purity of lithium carbonate product is more than 99.2%.All performance indicators meet the requirements of lithium carbonate industrial products.The successful trial operation of this pilot plant can be used for reference for the development of industrial scale lithium extraction facilities from produced water in oil and gas field.