GB/T 24229-2009 English PDF

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GB/T 24229-2009: Chromium ores and concentrates -- Determination of aluminium content -- Complexometric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 24229-2009	189	Add to Cart	3 days	Chromium ores and concentrates -- Determination of aluminium content -- Complexometric method	Valid

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GB/T 29516   SN/T 2638.3   GB/T 24197   GB/T 24221   GB/T 24222   GB/T 24220   

Basic data

Standard ID: GB/T 24229-2009 (GB/T24229-2009)
Description (Translated English): Chromium ores and concentrates -- Determination of aluminium content -- Complexometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D33
Classification of International Standard: 73.060.30
Word Count Estimation: 8,854
Date of Issue: 2009-07-15
Date of Implementation: 2010-04-01
Adopted Standard: ISO 8889-1988, MOD
Regulation (derived from): National Standard Approval Announcement 2009 No.9 (Total No.149)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the determination of Chromium ores and concentrates aluminum content complexometric titration. This standard applies to the determination of chromium ore and chrome ore in aluminum content. Measuring range (qualitative test scores): 1. 5% -20. 0 %, this standard shall comply with the relevant provisions of GB/T 24228 's.

GB/T 24229-2009: Chromium ores and concentrates -- Determination of aluminium content -- Complexometric method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Chromium ores and concentrates. Determination of aluminium content. Complexometric method ICS 73.060.30 D33 National Standards of People's Republic of China Determination of Chromium ores and concentrates of aluminum content Complexometric titration (ISO 8889. 1988, MOD) Posted 2009-07-15 2010-04-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This revised standard adopts ISO 8889. 1988 "Chromium ores and concentrates - Determination of aluminum content complexometric titration" (in English). This standard and ISO 8889. compared to 1988 mainly the following modifications. --- "2 Normative references" in place of national standards with international standards corresponding; --- Added "6 sampling and sample preparation"; --- Added "7.1 Determination of times"; --- Added "10 test report." The standard proposed by China Iron and Steel Association. This standard by the National Standardization Technical Committee of pig iron and ferroalloy. This standard was drafted. Tianjin People's Republic of China Exit Inspection and Quarantine, metallurgical industry Information Standards Institute, Ningbo Inspection and Phytophthora Institute of Science and Technology. The main drafters of this standard. Wei Hongbing, Wangzhen Kun, Gu Songhai, Yang Lifei, Yaozhuan Gang, from Madrid, Zheng Lin, Chen Zibin. Determination of Chromium ores and concentrates of aluminum content Complexometric titration Warning --- personnel should use this standard regular laboratory work experience. This standard does not point out all possible security asked question. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant state laws and regulations.

1 Scope

This standard specifies the determination of Chromium ores and concentrates aluminum content complexometric titration. This standard applies to the determination of chromium and chromium ore concentrate aluminum content. Measurement range (mass fraction). 1.5% to 20.0%, this standard should Comply with the relevant provisions of GB/T 24228 of.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD) GB/T 12805 Laboratory glassware burette (GB/T 12805-1991, neqISO 385. 1984) GB/T 12806 Laboratory glassware single marking flask (GB/T 12806-1991, eqvISO 1042. 1983) GB/T 12808 standard laboratory glassware single line pipette (GB/T 12808-1991, eqvISO 648. 1977) GB/T 24228 Chromium ores and concentrates - General method (GB/T 24228-2009, ISO 6629. 1981, MOD) GB/T 24220 chrome ore samples were analyzed for moisture intrudes Gravimetric method (GB/T 24220-2009, ISO 6129. 1981, MOD) GB/T 24243 chrome ore samples taken parts (GB/T 24243-2009, ISO 6153. 1989, IDT) ISO 6154 chrome ore sample preparation Principle 3 Sample with perchloric acid, nitric acid and hydrochloric acid decomposition, chromium chloride is removed by distillation in the form of chromium. Separating the insoluble residue and the filtrate was left primary save. Residue on ignition, treated with sulfuric acid and hydrofluoric acid. Join calcined coke residue of molten sodium. Dissolving frit, and the obtained solution was Master were combined. Solution was precipitated with ammonium hydroxide, filtered, redissolved in hydrochloric acid, hydroxides, add hydrogen peroxide to the reduction of chromate Cr (Ⅲ) ion, sodium hydroxide separating aluminum from iron and other elements. Aliquot of test solution was added to the EDTA solution to XO As indicator, titrated with zinc acetate excess EDTA. Sodium fluoride decomposition aluminum complex with xylenol orange as indicator, with acetic acid Zinc titrate released EDTA.

4 Reagents

Analysis Unless otherwise stated, use only reagents of recognized analytical grade and distilled water or equivalent purity of its water, in line with GB/T 6682 Provisions. 4.1 sodium pyrosulfate (Na2S2O7). 4.2 hydrochloride, ρ1.19g/mL. HCl 4.3, 1 + 1. ......

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