GB/T 11064.2-2023Methods for chemical analysis of lithium carbonate,lithium hydroxide monohydrate and lithium chloride - Part 2:Determination of lithium hydroxide content - Acid-alkali titrimetric method (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020 Directives for standardization - Part

1.Rules for the structure and drafting of standardizing documents. This document is part 2 of GB/T 11064 Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride. The following parts of GB/T 11064 have been issued. -- Part

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

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

1 Scope

GB/T 11064.2-2023 is the Chinese national standard on methods for chemical analysis of lithium carbonate,lithium hydroxide monohydrate and lithium chloride - part 2:determination of lithium hydroxide content - acid-alkali titrimetric method, in the field of metallurgy. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 23 May 2023 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 December 2023. Classification: ICS 77.120.99, CCS H14. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This document describes a method for the determination of lithium hydroxide content in lithium hydroxide monohydrate by acid-alkali titration. This document applies to the determination of lithium hydroxide content in lithium hydroxide monohydrate. The determination range (mass fraction) is greater than or equal to 55.00%.

2 Normative references

The following documents contain the provisions which, through normative reference in this document, constitute the essential provisions of this document. For the dated referenced documents, only the versions with the indicated dates are applicable to this document; for the undated referenced documents, only the latest version (including all the amendments) is applicable to this document.

GB/T 6682 Water for analytical laboratory use - Specification and test methods

GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values

GB/T 12805 Laboratory glassware - Burettes

GB/T 17433 Foundation terms for chemical analysis of metallurgical products

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

4.Determination of potassium and sodium content - Flame atomic absorption spectrometric method; -- Part

5.Determination of calcium content - Flame atomic absorption spectrometric method; -- Part

6.Determination of magnesium content - Flame atomic absorption spectrometric method; -- Part

7.Determination of iron content - 1,10-Phenanthroline spectrophotometric method; -- Part

8.Determination of silicon content - Molybdenum blue spectrophotometric method; -- Part

4 Principles

The sample is dissolved with a certain amount of hydrochloric acid standard solution, methyl red-bromocresol green is used as the indicator, then the total alkalinity of the test solution is titrated with hydrochloric acid standard titration solution, and the content of lithium hydroxide is calculated according to the consumption of hydrochloric acid standard titration solution.

5 Reagents or materials

Unless otherwise specified, only analytically pure reagents are used.

5.1 Water It shall conform to grade II water specified in GB/T 6682, and shall be sealed and cooled to room temperature after boiling.

6 Instruments and equipment

A burette (grade A) with a stopper, 50 mL, shall comply with the provisions of GB/T 12805.

7 Samples

Samples shall be packed in plastic containers and sealed for storage.

9 Experimental data processing

The content of lithium hydroxide is expressed as the mass fraction of lithium hydroxide (wLiOH) and calculated according to formula (2).

10 Precision

10.1 Repeatability The measured values of two independent test results obtained under repeatability conditions shall be within the average value range given in Table 1; the absolute difference between the two test results shall not exceed the repeatability limit (r), and the probability of exceeding the repeatability limit (r) shall not be more than 5%. The repeatability limit (r) is obtained according to the data in Table 1 by linear interpolation or extrapolation.

10.2 Reproducibility The measured values of two independent test results obtained under reproducibility conditions shall be within the average value range given in Table 2; the absolute difference between the two test results shall not exceed the reproducibility limit (R), and the probability of exceeding the reproducibility limit (R) shall not be more than 5%. The reproducibility limit (R) is obtained according to the data in Table 2 by linear interpolation or extrapolation.

12 Determination of carbonate content - acid-alkali titrimetric method; -- Part

13.Determination of aluminum content - Chromazurol S-cetylpyridine bromide spectrophotometric method; -- Part

14.Determination of arsenic content - Molybdenum blue spectrophotometric method; -- Part

15 Determination of fluorine content - Ion selective method; -- Part

16.Determination of calcium, magnesium, copper, lead, zinc, nickel, manganese, cadmium, aluminum, iron and sulfate contents - Inductively coupled plasma atomic emission spectrometry. This document replaces GB/T 11064.2-2013 Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride - Part 2. Determination of lithium hydroxide content - Acid-alkali titrimetric method. Compared with GB/T 11064.2-2013, except for structural adjustment and editorial changes, the main technical changes in this document are as follows:

a) The concentration of hydrochloric acid standard titration solution is changed (see 5.3; see

3.2 of the 2013 edition);

b) A blank test is added (see 8.3);

c) The determination operation is changed (see 8.4; see

5.3 of the 2013 edition);

d) The calculation formula is changed (see Chapter 9; see Chapter 6 of the 2013 edition);

e) The allowable difference is deleted (see

7.2 of the 2013 edition);

f) The clause of reproducibility is added (see 10.2). Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by China Non-Ferrous Metals Industry Association. This document shall be under the jurisdiction of the National Technical Committee on Nonferrous Metals of Standardization Administration of China (SAC/TC243). Drafting organizations of this document. Tianqi Lithium Co., Ltd., Jiangxi Ganfeng Lithium Group Co., Ltd., Guangdong Brunp Recycling Technology Co., Ltd., Yichun YinLi New Energy Co., Ltd., Yahua Lithium (Yaan) Co., Ltd., General Lithium Co., Ltd., Xinjiang Research Institute of Non-ferrous Metals, Guohe General (Qingdao) Test and Evaluation Co., Ltd., Zijin Mining Group Co., Ltd., Zhejiang Huayou Cobalt Co., Ltd., Center for Industrial Analysis and Testing of Guangdong Academy of Sciences, Yichun Lithium Battery Industry Research Institute (Jiangxi Lithium Battery Product Quality Supervision and Inspection Center), Jiangxi Jiuling Lithium Co., Ltd. The main drafters of this document. Zhang Bingyuan, He Lan, Zhang Jun, Cai Guohong, Li Qing, Deng Hongyun, Yu Haijun, Tang Jiahua, Yu Jun, Chao Qun, Yang Xueru, Zeng Xiaoyue, Zhou Liang, Tang Qing, Dai Zehua, Yao Li. This document was first published in 1989, and revised for the first time in 2013; this is the second revision.