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GB/T 11064.2-2023 PDF English

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GB/T 11064.2-2023: Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride - Part 2: Determination of lithium hydroxide content - Acid-alkali titrimetric method
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GB/T 11064.2: Evolution and historical versions

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GB/T 11064.2-2023English125 Add to Cart 0-9 seconds. Auto-delivery Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride - Part 2: Determination of lithium hydroxide content - Acid-alkali titrimetric method Valid
GB/T 11064.2-2013English85 Add to Cart 0-9 seconds. Auto-delivery Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride -- Part 2: Determination of lithium hydroxide content -- Acid-alkali titrimetric method Obsolete
GB/T 11064.2-1989English199 Add to Cart 2 days Lithium carbonate--Determination of lithium hydroxide content--Acid-alkali titrimetric method Obsolete

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



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GB NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA ICS 77.120.99 CCS H 14 Replacing 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 Issued on. MAY 23, 2023 Implemented on. DECEMBER 1, 2023 Issued by. State Administration for Market Regulation; Standardization Administration of PRC.

Table of Contents

Foreword... 3 Introduction... 6 1 Scope... 8 2 Normative references... 8 3 Terms and definitions... 8 4 Principles... 9 5 Reagents or materials... 9 6 Instruments and equipment... 10 7 Samples... 10 8 Test steps... 10 9 Experimental data processing... 11 10 Precision... 12 11 Test report... 12

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 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 9.Determination of sulfate content - Barium sulfate turbidity method; -- Part 10.Determination of chlorine content - Silver chloride nephelometry method; -- Part 11.Determination of acid-insolubles - Gravimetric method; -- Part 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.

1 Scope

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 Terms and definitions

The terms and definitions defined in GB/T 17433 apply to this document.

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. 5.2 Methyl red-bromocresol green indicator Solution Ⅰ. Weigh 0.1 g of bromocresol green, dissolve it in ethanol (95%), and dilute the solution to 100 mL with ethanol (95%). Solution Ⅱ. Weigh 0.2 g of methyl red, dissolve it in ethanol (95%), and dilute the solution to 100 mL with ethanol (95%). Take 30 mL of solution Ⅰ and 10 mL of solution Ⅱ, and mix well. 5.3 Hydrochloric acid standard titration solution [cHCl =0.30 mol/L] 5.3.1 Preparation. Pipette 25 mL of hydrochloric acid (ρ=1.19 g/mL), place it in a 1000 mL volumetric flask, dilute to the mark with water, and mix well.

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.

8 Test steps

8.1 Sample Quickly weigh 0.50 g of the sample, accurate to 0.0001 g. 8.2 Parallel test Carry out two experiments in parallel, and take the average value as the result. 8.3 Blank test Do a blank test at the same time as the sample test. 8.4 Determination Put the test sample (8.1) in a 250 mL Erlenmeyer flask in which 30 mL of hydrochloric acid standard titration solution (5.3) has been pre-added, add 10 drops of methyl red- bromocresol green indicator (5.2), and titrate with hydrochloric acid standard titration solution (5.3) until the test solution turns from green to wine red, that is the end point. Carbon dioxide interference shall be avoided during the titration.

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.

11 Test report

The test report shall include the following contents. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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