GB/T 24225-2009 English PDF

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GB/T 24225-2009: Chromium ores -- Determination of total iron content -- Titrimetric method after reduction
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 24225-2009	189	Add to Cart	3 days	Chromium ores -- Determination of total iron content -- Titrimetric method after reduction	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 24225-2009 (GB/T24225-2009)
Description (Translated English): Chromium ores -- Determination of total iron content -- Titrimetric method after reduction
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D33
Classification of International Standard: 73.060.30
Word Count Estimation: 8,887
Date of Issue: 2009-07-15
Date of Implementation: 2010-04-01
Adopted Standard: ISO 6130-1985, 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 total iron content of chromium ore dichromate method after reduction. This standard applies to the determination of total chromium containing iron ore. Measuring range (mass fraction): 0. 5 % -32 %, the standard shall comply with the relevant provisions of GB/T 24228 's.

GB/T 24225-2009: Chromium ores -- Determination of total iron content -- Titrimetric method after reduction

---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. Determination of total iron content. Titrimetric method after reduction ICS 73.060.30 D33 National Standards of People's Republic of China Determination of total iron content of chrome ore Reduction titration (ISO 6130. 1985, 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 6130. 1985 "Determination of total iron content of chromium ore reduction titration" (in English). This standard and ISO 6130. 1985 compared to the main job of the following changes. --- "2 Normative references" in place of national standards with international standards corresponding; --- Added "6 sampling and sample preparation" clause; --- Added "7.1 Determination of the number of times" clause; --- Added "10 Test Report" clause; --- "Restore 7.5 and titration" with titanium trichloride reduction method instead of mercuric chloride method. 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, from Madrid, Gu Songhai, Su Mingyue, Feng Yuxin, Wangzhen Kun, Song Yi, Chen Zibin. Determination of total iron content of chrome ore Reduction 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 total iron content of chrome ore dichromate method after the reduction. This standard applies to the determination of chromium ore in total iron content. Measurement range (mass fraction). 0.5% to 32% of this standard shall comply with GB/T 24228 of the relevant provisions.

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 nitric acid, sulfuric acid and perchloric acid or sodium peroxide decomposition melting, water-leached frit. With ammonia ferric hydroxide precipitate was separated Shen Precipitate, the precipitate was then dissolved in hydrochloric acid. The solution was evaporated, with stannous chloride to restore most of the bivalent ferric iron, sodium tungstate to indicate Agents, titanium trichloride remaining ferric reduced to ferrous iron, potassium dichromate oxidation of excess titanium trichloride.

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 carbonate, anhydrous or pre-ignition at 500 ℃. 4.2 Sodium peroxide (Na2O2), dry powder. Note. Sodium peroxide should be as dry as possible, once agglomeration can not be used. 4.3 hydrochloride, ρ1.19g/mL. 4.4 HCl, 1 + 2. 4.5 HCl, 1 + 9. ......

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