Scholarlink

<p>The treatment of lithium precipitation end liquors from salt lakes such as those in Qinghai, China, characterized by a high sodium-to-lithium ratio (Na/Li ≈ 87), requires efficient and selective extraction processes. While 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) has been used with neutral organophosphorus synergists for lithium recovery and rare-earth extraction, its combination with trialkylphosphine oxide (TRPO) has not been explored for high-sodium salt lake brines, and existing PMBP-based approaches often require pre-saponification, adding process complexity. In this work, a PMBP-TRPO synergistic system is proposed for this application, and a systematic process optimization is performed. Through single-factor experiments, optimal extraction conditions were determined to be: PMBP-to-Li molar ratio ≈ 1.77, TRPO concentration ≈ 13.3% v/v, aqueous phase pH 12, O/A ratio of 3:1, and mixing time of 1&#xa0;min. Without a pre-saponification step, a single-stage lithium extraction efficiency of 90.13% was achieved with only 3.32% sodium co-extraction. Scrubbing with 2% HCl removed &gt; 70% co-extracted sodium while limiting lithium loss to &lt; 1.5%. FTIR analysis confirmed that both C=O (PMBP) and P=O (TRPO) groups participate in lithium coordination. This work provides a promising, operationally simpler process for selective lithium recovery from high-sodium brines and expands the scope of applications for PMBP-based synergistic systems.</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

Process Optimization and Mechanistic Insights into the Selective Extraction of Lithium from High-Sodium Salt Lake Brine Using a PMBP-TRPO Synergistic System

  • 期刊论文

  • 发表日期：

    2026年7月6日

查看全文
  • Zong Guo,
  • Li Yan,
  • Honghong Sun,
  • Hao Ma

摘要

The treatment of lithium precipitation end liquors from salt lakes such as those in Qinghai, China, characterized by a high sodium-to-lithium ratio (Na/Li ≈ 87), requires efficient and selective extraction processes. While 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) has been used with neutral organophosphorus synergists for lithium recovery and rare-earth extraction, its combination with trialkylphosphine oxide (TRPO) has not been explored for high-sodium salt lake brines, and existing PMBP-based approaches often require pre-saponification, adding process complexity. In this work, a PMBP-TRPO synergistic system is proposed for this application, and a systematic process optimization is performed. Through single-factor experiments, optimal extraction conditions were determined to be: PMBP-to-Li molar ratio ≈ 1.77, TRPO concentration ≈ 13.3% v/v, aqueous phase pH 12, O/A ratio of 3:1, and mixing time of 1 min. Without a pre-saponification step, a single-stage lithium extraction efficiency of 90.13% was achieved with only 3.32% sodium co-extraction. Scrubbing with 2% HCl removed > 70% co-extracted sodium while limiting lithium loss to < 1.5%. FTIR analysis confirmed that both C=O (PMBP) and P=O (TRPO) groups participate in lithium coordination. This work provides a promising, operationally simpler process for selective lithium recovery from high-sodium brines and expands the scope of applications for PMBP-based synergistic systems.