GB/T 14840-2010 English PDF

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GB/T 14840-2010: Methods for chemical analysis of limestones -- Determination of free silicon dioxide content
Status: Valid

GB/T 14840: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 14840-2010	189	Add to Cart	3 days	Methods for chemical analysis of limestones -- Determination of free silicon dioxide content	Valid
GB/T 14840-1993	279	Add to Cart	3 days	Chemical analysis of limestons for free silica	Obsolete

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Basic data

Standard ID: GB/T 14840-2010 (GB/T14840-2010)
Description (Translated English): Methods for chemical analysis of limestones -- Determination of free silicon dioxide content
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D53
Classification of International Standard: 73.080
Word Count Estimation: 8,822
Date of Issue: 2010-11-10
Date of Implementation: 2011-02-01
Older Standard (superseded by this standard): GB/T 14840-1993
Quoted Standard: GB/T 6682
Regulation (derived from): National Standard Approval Announcement 2010 No.8 (Total No.163)
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 amount of limestone free silica (SiO2) measurement method. This standard applies to the determination of the amount of free silica limestone. Can also be used for ordinary portland cement raw meal Determination of free silica. Measuring range: 1. 00% to 10. 00 % (by mass) of the amount of free silica.

GB/T 14840-2010: Methods for chemical analysis of limestones -- Determination of free silicon dioxide content

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Methods for chemical analysis of limestones. Determination of free silicon dioxide content ICS 73.080 D53 National Standards of People's Republic of China Replacing GB/T 14840-1993 Methods for chemical analysis of limestone Determination of the amount of free silica Issued on. 2010-11-10 2011-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard replaces GB/T 14840-1993 "free silica limestone for chemical analysis method." This standard compared with GB/T 14840-1993, the main changes are as follows. --- Changing the name of the standard; --- The formula for calculating the mass fraction represented by the symbol ω instead w; --- Increased caution, warning section. Appendix A of this standard is an informative annex. The standard proposed by the People's Republic of China Ministry of Land Resources. This standard by the National Standardization Technical Committee of Land and Resources. This standard is drafted by. National Geological Experimental Test Center. This standard was drafted. National Geological experimental test center, Sinoma Geological Engineering Exploration Institute. The main drafters of this standard. Hanxiu Qing, Li Shumin. This standard replaces the previous standard release case. GB/T 14840-1993. Methods for chemical analysis of limestone Determination of the amount of free silica Warning. Use of this standard shall have a person experiences regular laboratory work. This standard does not point out all possible security issues. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.

1 Scope

This standard specifies the amount of free silica limestone (fSiO2) measurement method. This standard applies to the amount of limestone in the determination of free silica, it can also be used for ordinary Portland cement raw meal amount of free silica Determination. Measuring range. 1.00% to 10.00% (by mass) of the amount of free silica.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms of dated references, all subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to study under this agreement is standard Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. Laboratory use specifications and test methods GB/T 6682 Analysis Principle 3 Make use of concentrated phosphoric acid dissolved silicate mineral solubility but this feature has little free silica when heated, under certain conditions Under allow free silica and most aluminosilicate mineral separation, followed by gravimetric method was measured.

4 Reagents

Unless otherwise indicated, the analysis uses only recognized as an analytical reagent; the water is distilled or deionized water or equivalent purity Water, should meet the requirements GB/T 6682's. 4.1 phosphoric acid (ρ1.70g/mL). 4.2 fluoroborate (ρ1.84g/mL). Warning. fluoroborate toxic, corrosive, the operation should wear gloves to prevent skin contact 4.3 Hydrofluoric acid (ρ1.15g/mL). WARNING. Hydrofluoric acid is toxic and corrosive, the operation should wear gloves to prevent skin contact 4.4 ammonia solution (15). 4.5 ammonium nitrate solution (2g/L). Weigh 2g of ammonium nitrate dissolved in 1000mL warm water with ammonia solution (4.4) methyl red solution (4.6) as indicator adjusted pH≈7. 4.6 sulfuric acid solution (11). Warning. Risk of improper dilution prone should beaker of sulfuric acid was slowly added to an aqueous solution of the same volume And stir constantly with a glass rod. 4.7 methyl red solution (2g/L). Weigh 0.2g of methyl red dissolved in 60mL of anhydrous ethanol, diluted with water to 100mL.

5 instruments and devices

5.1 Analytical balance, three, a sense of the amount of 0.1mg. 5.2 furnaces, sizes larger than 1000 ℃. 5.3 disc electric power of 2000W ~ 3000W, hob diameter of 230mm. 5.4 regulator, pressure range of 0 ~ 250V. ......

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