Scholarlink

<p>Oilfield brine represents a growing environmental concern, yet its high lithium content offers a cost-effective and potential recovery resource. This study focuses on lithium extraction from oilfield brines, a resource characterized by high calcium concentration, high salinity, acidic pH, and lack of sulfate ions. Since the evaporation process resulted solely in NaCl deposition, an alternative method was required. A redox-based approach, selected for its eco-friendly properties, was implemented by using anhydrous FePO<sub>4</sub> (sorbent) and Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub> (reducing agent) to lithium sequestration. XRD and XRF results revealed that FePO₄ exhibits a trigonal crystalline structure consisting of 51 wt% Fe<sub>2</sub>O₃ and 48 wt% P₂O₅. To enhance the trapping, a response surface methodology (RSM) is conducted in order to model and optimize the lithium and sodium retention rates by varying five independent factors. The outcomes of this approach yielded to a validate and predictive model with the optimal conditions (FePO₄, 1.0 g/L; Li⁺/S<sub>2</sub>O<sub>3</sub><sup>2</sup>⁻ ratio, 0.4; temperature, 25 °C; pH, 7.5; time, 18 h) achieved at lithium and sodium retention rates of 35 and 5 mg/g FePO₄, respectively. Post-reaction analyses (XRD, FTIR, and SEM/EDX) of the optimal Li<sub>x</sub>FePO<sub>4</sub> product confirmed high lithium selectivity and structural similarity to both FePO₄ and LiFePO₄, demonstrating a sustainable strategy for oilfield brine valorization which involves converting waste into valuable resources through a circular economy. This approach effectively reclaims water, extracts critical minerals, and significantly reduces environmental impact. It successfully balances economic benefits with ecological responsibility.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhancement of lithium extraction process from oilfield brine by response surface methodology: modelling and optimization

  • 期刊论文

  • 发表日期：

    2025年10月9日

查看全文
  • Kais Djebali,
  • Nizar Debbech,
  • Moufida Borni,
  • Ghaith Hamdaoui,
  • Mohamed Triki,
  • Ahmed Hichem Hamzaoui

摘要

Oilfield brine represents a growing environmental concern, yet its high lithium content offers a cost-effective and potential recovery resource. This study focuses on lithium extraction from oilfield brines, a resource characterized by high calcium concentration, high salinity, acidic pH, and lack of sulfate ions. Since the evaporation process resulted solely in NaCl deposition, an alternative method was required. A redox-based approach, selected for its eco-friendly properties, was implemented by using anhydrous FePO4 (sorbent) and Na2S2O3 (reducing agent) to lithium sequestration. XRD and XRF results revealed that FePO₄ exhibits a trigonal crystalline structure consisting of 51 wt% Fe2O₃ and 48 wt% P₂O₅. To enhance the trapping, a response surface methodology (RSM) is conducted in order to model and optimize the lithium and sodium retention rates by varying five independent factors. The outcomes of this approach yielded to a validate and predictive model with the optimal conditions (FePO₄, 1.0 g/L; Li⁺/S2O32⁻ ratio, 0.4; temperature, 25 °C; pH, 7.5; time, 18 h) achieved at lithium and sodium retention rates of 35 and 5 mg/g FePO₄, respectively. Post-reaction analyses (XRD, FTIR, and SEM/EDX) of the optimal LixFePO4 product confirmed high lithium selectivity and structural similarity to both FePO₄ and LiFePO₄, demonstrating a sustainable strategy for oilfield brine valorization which involves converting waste into valuable resources through a circular economy. This approach effectively reclaims water, extracts critical minerals, and significantly reduces environmental impact. It successfully balances economic benefits with ecological responsibility.