GB/T 11064.2-2023 in English
VALIDMethods for chemical analysis of lithium carbonate,lithium hydroxide monohydrate and lithium chloride—Part 2:Determination of lithium hydroxide content—Acid-alkali titrimetric method
- Issued on:2023-05-23
- Implemented on:2023-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$117.00
《GB/T 11064.2-2023碳酸锂、单水氢氧化锂、氯化锂化学分析方法 第2部分：氢氧化锂含量的测定 酸碱滴定法》由TC243（全国有色金属标准化技术委员会）归口，TC243SC3（全国有色金属标准化技术委员会稀有金属分会）执行，主管部门为中国有色金属工业协会。
Introduction
GB/T 11064.2—2023 Standard Interpretation: Determination Method of Lithium Hydroxide Content
GB/T 11064.2—2023 is Part 2 of "Chemical Analysis Methods for Lithium Carbonate, Lithium Hydroxide Monohydrate and Lithium Chloride", which mainly stipulates the method for determining the lithium hydroxide content in lithium hydroxide monohydrate by acid-base titration. This standard was issued in 2023, replacing the old version of the standard (GB/T 11064.2—2013) in 2013, and made important revisions in terms of hydrochloric acid standard solution concentration, blank test, determination operation and calculation formula.
I. Background of Standard Formulation
Lithium carbonate, lithium hydroxide monohydrate and lithium chloride are important basic materials in the fields of new energy batteries, electronic equipment, energy storage power supplies, etc. With the growth of global demand for green energy, the demand for lithium salt products has increased significantly. The GB/T 11064 series of standards provides a scientific basis for ensuring product quality and consistency.
II. Analysis of Technological Evolution
| Revision points | Contents of the 2013 edition | Revisions to the 2023 edition |
|---|---|---|
| Concentration of hydrochloric acid standard solution | c(HCl) = 1.0 mol/L | c(HCl) = 0.30 mol/L |
| Blank test requirements | Not clearly specified | Add blank test (see 8.3) |
| Determination operation steps | Directly titrate to the endpoint | New boiling and endpoint judgment conditions |
III. Explanation of professional terms and practical application cases
Methyl red-bromocresol green indicator: This composite indicator shows color change in acid-base titration and is used to judge the endpoint. Methyl red is red under acidic conditions and bromocresol green is green under alkaline conditions.
Calculation formula for lithium hydroxide content: The conversion factors in formula (2) are used to deduct the influence of other alkaline components in the sample on the determination results to ensure the accuracy of the test.
In practical applications, for example, when determining monohydrate lithium hydroxide samples, care should be taken to avoid CO₂ interference. It is recommended to use a stoppered burette to control the titration speed during the titration process.
IV. Comparison of standard framework and implementation suggestions
GB/T 11064 series of standards covers multi-element analysis methods for lithium salt products, including:
- Part 1: Determination of lithium carbonate content by acid-base titration
- Part 3: Determination of lithium chloride content by potentiometric titration
- Parts 4-8: Determination of metal elements such as potassium, sodium, calcium, and magnesium
Implementation suggestions:
- Prepare hydrochloric acid standard solution in strict accordance with standard requirements and perform calibration.
- Pay attention to controlling CO₂ interference during operation. It is recommended to boil the test solution for 2 minutes before titration.
- Blank test is an important step to ensure data accuracy and must be performed with sample determination.
V. Conclusion
GB/T 11064.2-2023 provides a scientific and accurate method for determining the content of lithium hydroxide, which is suitable for the quality control of lithium hydroxide monohydrate products. The revision of this standard reflects the progress of industry technology and the improvement of analytical accuracy requirements, and has important guiding significance in the field of new energy materials.
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