从α-Spodumene通过固态反应直接提取,以实现可持续的Li2CO3生产
Shilong Wang1,2, Nathan J Szymanski1,2, Yuxing Fei1,2
1Department of Mat. Sci. & Engineering, UC Berkeley, Berkeley, California 94720, United States.
Inorganic chemistry
|July 9, 2024
概括
一种新方法在750°C使用碳酸和化从α-spodumene中提取碳酸 (Li2CO3). 这种节能,无酸的工艺为采购提供了一个可持续的替代方案.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 矿物加工 矿物加工
背景情况:
- 对离子电池的日益增长的需求需要除了传统盐水之外的替代 (Li) 来源.
- 斯波杜是重要的含矿物质,但传统的加工是能源密集型和昂贵的.
- 目前的方法涉及高温相位转换和酸,这给环境和经济带来了挑战.
研究的目的:
- 开发一种新的,节能的,无酸的方法,从α-spodumene中直接提取碳酸 (Li2CO3).
- 为了研究反应机制并优化Li2CO3产生的条件.
- 为采购提供可持续的替代方案,以满足日益增长的电池需求.
主要方法:
- 在750°C时,α-spodumene与碳酸 (Na2CO3) 和氧化 (Al2O3) 直接反应.
- 优化反应时间以最大限度地提高Li2CO3产量.
- 通过脱离离子化水洗来分离Li2CO3.
主要成果:
- 通过在750°C时与Na2CO3和Al2O3反应alpha-spodumene获得>90%的Li2CO3产量.
- 证明Al2O3的添加对于抑制Li2SiO3的形成和促进Li2CO3和NaAlSiO4作为唯一产品至关重要.
- 确定4小时作为最佳反应时间,超出4小时后,收益率受到波动性的限制.
结论:
- 开发的方法提供了一种节能和无酸的途径,可以从α-spodumene直接提取Li2CO3.
- 这一过程可以为多元化来源和满足全球电池需求做出重大贡献.
- 这些发现提供了一个可行的替代方案,以传统的,高温和酸密集型的spodumene加工.
相关概念视频
00:56Extraction: Advanced Methods
444
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
444
03:00Electrolysis
26.3K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.3K
01:19Acid Halides to Alcohols: LiAlH4 Reduction
2.7K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
2.7K