GB/T 24220-2009 English PDF

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GB/T 24220-2009: Chromium ores -- Determination of hygroscopic moisture content in analytical samples -- Gravimetric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 24220-2009	149	Add to Cart	2 days	Chromium ores -- Determination of hygroscopic moisture content in analytical samples -- Gravimetric method	Valid

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Basic data

Standard ID: GB/T 24220-2009 (GB/T24220-2009)
Description (Translated English): Chromium ores -- Determination of hygroscopic moisture content in analytical samples -- Gravimetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D33
Classification of International Standard: 73.060.30
Word Count Estimation: 5,541
Date of Issue: 2009-07-15
Date of Implementation: 2010-04-01
Quoted Standard: GB/T 24228; GB/T 24243; ISO 6154
Adopted Standard: ISO 6129-1981, 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 ore analysis of moisture content in the sample weight method. This standard applies to the determination of chromium ore analysis of moisture content of the sample.

GB/T 24220-2009: Chromium ores -- Determination of hygroscopic moisture content in analytical samples -- Gravimetric 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. Determination of hygroscopic moisture content in analytical samples. Gravimetric method ICS 73.060.30 D33 National Standards of People's Republic of China Determination of chromium ore sample water in the wet Gravimetric method (ISO 6129. 1981, 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 6129. 1981 "chrome ore samples were analyzed for moisture intrudes Gravimetric method" (in English). This standard and ISO 6129. 1981 compared to the main job of the following changes. --- In Chapter 2, "Normative references" in place of national standards with international standards corresponding; --- Increased Chapter 5, "Sampling and sample preparation"; --- Increased Chapter 9, "the 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, new Feng Yu, Gu Songhai, Li Anmin, Yan Chen, Wang Hong, Su Mingyue should pine, Chenzi Bin. Determination of chromium ore sample water in the wet Gravimetric method 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 ore samples were analyzed for the content of water in the wet weight method. This standard applies to the determination of chromium ore sample analysis of the content of water in the wet. Chrome ore requirements of this standard analysis measurement sample moisture intrudes content should chromium ore samples were analyzed for determination of other components at the same time, this Standards 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 24228 Chromium ores and concentrates - General method (GB/T 24228-2009, ISO 6629. 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 The pre-dried in the air sample was placed on 105 ℃ ~ 110 ℃ of oven dried to constant mass variation before and after drying i.e. For the quality of water in the wet.

4 Instrument

The following general laboratory equipment and utensils, equipment. 4.1 weighing bottle, diameter not less than 5cm, and with a tight grinding mouth cover. 4.2 oven, capable of maintaining the temperature in the range of 105 ℃ ~ 110 ℃.

5 Sampling and sample preparation

Laboratory samples should be analyzed by GB/T 24243, ISO 6154 sampling and sample preparation, particle size less than 100μm. Step 6 Analysis 6.1 Sample In the oven of 105 ℃ ~ 110 ℃ (4.2) in a pre-dried weighing bottle (4.1) and grinding mouth cover, weighing. Weigh the weighing bottle has 5g Pre-air-dried sample, accurate to 0.0002g, flat on the weighing bottle. 6.2 Determination Will be filled with sample (6.1) weighing bottle (4.1) open put in 105 ℃ ~ 110 ℃ in the oven (4.2) in the drying 1h, from the oven Remove, cover immediately mill flap, into the dryer to cool 20min ~ 30min. Remove the weighing bottle from the dryer, gently open grinding mouth cover, ......

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