GB/T 24227-2009Chromium ores and concentrates -- Determination of silicon content -- Spectrophotometric method and gravimetric method (English PDF)

Foreword

This revised standard adopts ISO 5997. 1984 "chrome ore and chrome ore silicon content determination of molecular absorption spectrometric method and gravimetric method." (In English).

This standard and ISO 5997. 1984 as compared to, mainly to do the following changes.

--- "2 Normative references" in place of national standards with international standards corresponding;

--- 3.2.6.2 in the "Silicon standard solution" by the ISO 5997. 1984's "1mL of the standard solution containing silicon 0.0050mg" revised the standard "1mL of the standard solution containing silicon 0.0025mg";

--- Added "3.4 Sampling and sample preparation";

--- Added "3.5.1 Determination of times";

--- Added "4.4 Sampling and sample preparation";

--- Added "4.5.1 Determination of times";

--- Added "5 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.

1 Scope

This standard specifies the determination of Chromium ores and concentrates silicon content gravimetric method and spectrophotometry.

This standard applies to the determination of Chromium ores and concentrates silicon content. Measurement range (mass fraction). 0.05% ~ spectrophotometry 0.5%; 0.5% by weight of law to 15.0%, this standard shall 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 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

3 Spectrophotometry