GB/T 11064.3-2013Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride - Part 3: Determination of lithium chloride content - Potentiometric method (English PDF)

Foreword

GB/T 11064 “Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride” is divided into 16 parts:

- Part 1: Determination of lithium carbonate content - Acid-alkali titrimetric method;

- Part 2: Determination of lithium hydroxide content - Acid-alkali titrimetric method;

- Part 3: Determination of lithium chloride content - Potentiometric method;

- Part 9: Determination of sulfate content - Barium sulfate nephelometry method;

- Part 10: Determination of chloride content - Silver chloride nephelometry method;

- Part 11: Determination of Acid-insolubles Content - Gravimetric method;

- Part 15: Determination of fluoride content - Ion selective method;

manganese, cadmium and aluminum content - Inductively coupled plasma atomic emission spectrometry.

This Part is drafted in accordance with the rules given in GB/T 1.1-2009.

This Part replaces GB/T 11064.3-1989 “Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride - Part 3: Determination of lithium chloride content - Potentiometric method”.

Compared with GB/T 11064.3-1989, the main changes of this Part are following:

- RE-EDIT the text format; ADD the test report.

This Part shall be under the jurisdiction of National Standardization Technical Committee of Nonferrous Metals (SAC/TC 243).

Drafting organizations of this Part: Sichuan Tianqi Lithium Co., Ltd., Jiangxi Ganfeng Lithium Co., Ltd., Xinjiang Institute of Nonferrous Metals, and Beijing General Research Institute of Mining and Metallurgy.

Main drafters of this Part: Tu Mingjiang, Luo Yuping, Gou Haixia, Yi Qingyun, Zeng Xianqin, Zhang Shaohui, and Jiang Qiutao.

The historical version replaced by this Part is as follows:

1 Scope

This Part of GB/T 11064 specifies the determination method for lithium chloride content in lithium chloride.

This Part applies to the determination of lithium chloride content in lithium chloride. The determination range: more than 95.00%.

2 Method summary

The sample is dissolved in water. In acidic solution, use silver (or silver-silver sulfide) electrode as measuring electrode; use calomel electrode as reference electrode; and use silver nitrate standard solution to titrate chloride. Use secondary derivative to determine the reaction end; use the consumed amount of silver nitrate standard titration solution to calculate the content of lithium chloride.

3 Reagents

Unless otherwise indicated, all reagents used in this Part are analytical reagent, the water used is deionized water.

4 Instruments

5 Samples

Samples shall be baked in advance at 250°C ~ 260°C for 2h, and placed in the dryer to cool to room temperature.

6 Analysis steps

7 Calculation of analysis results

Content of lithium chloride is calculated in mass fraction wLiCl of lithium chloride, expressed in %, according to equation (3).

the sample solution, in milliliters (mL);

the blank solution, in milliliters (mL);

V0 - The total volume of the sample solution, in milliliters (mL);

V7 - The volume of the separately weighed sample solution, in milliliters (mL);

m0 - The mass of the sample, in grams (g);

42.39 - The molar mass based on (LiCl) as the basic unit, in grams per mole (g/mol);

The result shall be expressed to two decimal places.

8 Precision

9 Test report

The test report shall contain the following content:

- Analysis result and its expression;

- Difference with the basic analysis step;

- Anomalies observed in the determination;

Annex A Example of test record format