ASTM E247-21

Standard Test Method for Determination of Silica in Manganese Ores, Iron Ores, and Related Materials by Gravimetry

SIGNIFICANCE AND USE
5.1 This test method is intended to be used for compliance with compositional specifications for silica content. It is assumed that all who use these procedures will be trained analysts capable of performing common laboratory procedures skillfully and safely. It is expected that work will be performed in a properly equipped laboratory and that proper waste disposal procedures will be followed. Appropriate quality control practices must be followed such as those described in Guide E882.
SCOPE
1.1 This test method covers the determination of silica in iron ores, iron ore concentrates and agglomerates, and manganese ore in the range from 0.5 % to 15 %.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Sep-2021
• ICS: 73.060.10 - Iron ores
• ICS: 73.060.20 - Manganese ores
• Technical Committee: E01 - Analytical Chemistry for Metals, Ores, and Related Materials
• Drafting Committee: E01.02 - Ores, Concentrates, and Related Metallurgical Materials

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E247 − 21
Standard Test Method for
Determination of Silica in Manganese Ores, Iron Ores, and
1
Related Materials by Gravimetry
This standard is issued under the fixed designation E247; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E877 Practice for Sampling and Sample Preparation of Iron
Ores and Related Materials for Determination of Chemi-
1.1 This test method covers the determination of silica in
cal Composition and Physical Properties
iron ores, iron ore concentrates and agglomerates, and manga-
E882 Guide for Accountability and Quality Control in the
nese ore in the range from 0.5 % to 15 %.
Chemical Analysis Laboratory
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
3. Terminology
standard.
3.1 Definitions—For definitions of terms used in this test
1.3 This standard does not purport to address all of the
method, refer to Terminology E135.
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4.1 The sample is fused with sodium peroxide in a zirco-
mine the applicability of regulatory limitations prior to use.
nium crucible. The melt is leached with water and dissolved in
1.4 This international standard was developed in accor-
HCl. Silica is separated by double dehydration with HClO .
4
dance with internationally recognized principles on standard-
The two precipitates are combined, ignited, and weighed. The
ization established in the Decision on Principles for the
silica is volatilized by treatment with HF and H SO and the
2 4
Development of International Standards, Guides and Recom-
residue weighed.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. 5. Significance and Use
5.1 This test method is intended to be used for compliance
2. Referenced Documents
with compositional specifications for silica content. It is
2
2.1 ASTM Standards:
assumed that all who use these procedures will be trained
D1193 Specification for Reagent Water
analysts capable of performing common laboratory procedures
E29 Practice for Using Significant Digits in Test Data to
skillfully and safely. It is expected that work will be performed
Determine Conformance with Specifications
in a properly equipped laboratory and that proper waste
E50 Practices for Apparatus, Reagents, and Safety Consid-
disposal procedures will be followed. Appropriate quality
erations for Chemical Analysis of Metals, Ores, and
control practices must be followed such as those described in
Related Materials
Guide E882.
E135 Terminology Relating to Analytical Chemistry for
6. Interferences
Metals, Ores, and Related Materials
E691 Practice for Conducting an Interlaboratory Study to
6.1 This test method is written for iron and manganese ores
Determine the Precision of a Test Method
containing less than 0.25 % of fluorine. None of the elements
normallyfoundinironoresorinmanganeseoresinterferewith
this test method.
1
This test method is under the jurisdiction of ASTM Committee E01 on
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
7. Apparatus
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-
lurgical Materials.
7.1 Zirconium Crucible (50-mL capacity).
Current edition approved Oct. 1, 2021. Published October 2021. Originally
ε1
7.2 Platinum Filter Cone.
approved in 1964. Last previous edition approved in 2015 as E247 – 01(2015) .
DOI: 10.1520/E0247-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 8. Reagents and Materials
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
8.1 Purity of Reagents—Reagent grade chemicals shall be
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. used in all tests. Unless otherwise indicated, it is intended that
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E247 − 21
all reagents conform to the specifications of the Committee on 10 mL to 15 mL of water into the crucible. When the reaction
Analytical Reagents of the American Chemical Society where ceases, empty the crucible contents and crucible rinsings int
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: E247 − 01 (Reapproved 2015) E247 − 21
Standard Test Method for
Determination of Silica in Manganese Ores, Iron Ores, and
1
Related Materials by Gravimetry
This standard is issued under the fixed designation E247; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Editorially corrected 1.1 and Table 1 in November 2015.
1. Scope
1.1 This test method covers the determination of silica in iron ores, iron ore concentrates and agglomerates, and manganese ore
in the range from 0.5 % to 15 %.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E50 Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials
E135 Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E877 Practice for Sampling and Sample Preparation of Iron Ores and Related Materials for Determination of Chemical
Composition and Physical Properties
E882 Guide for Accountability and Quality Control in the Chemical Analysis Laboratory
3. Terminology
3.1 Definitions—For definitions of terms used in this test method, refer to Terminology E135.
1
This test method is under the jurisdiction of ASTM Committee E01 on Analytical Chemistry for Metals, Ores, and Related Materials and is the direct responsibility of
Subcommittee E01.02 on Ores, Concentrates, and Related Metallurgical Materials.
Current edition approved Nov. 15, 2015Oct. 1, 2021. Published December 2015October 2021. Originally approved in 1964. Last previous edition approved in 20102015
ε1
as E247 – 01 (2010).(2015) . DOI: 10.1520/E0247-01R15E01.10.1520/E0247-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E247 − 21
4. Summary of Test Method
4.1 The sample is fused with sodium peroxide in a zirconium crucible. The melt is leached with water and dissolved in HCl. Silica
is separated by double dehydration with HClO . The two precipitates are combined, ignited, and weighed. The silica is volatilized
4
by treatment with HF and H SO and the residue weighed.
2 4
5. Significance and Use
5.1 This test method is intended to be used for compliance with compositional specifications for silica content. It is assumed that
all who use these procedures will be trained analysts capable of performing common laboratory procedures skillfully and safely.
It is expected that work will be performed in a properly equipped laboratory and that proper waste disposal procedures will be
followed. Appropriate quality control practices must be followed such as those described in Guide E882.
6. Interferences
6.1 This test method is written for iron and manganese ores containing less than 0.25 % of fluorine. None of the elements normally
found in iron ores or in manganese ores interfere with this test method.
7. Apparatus
7.1 Zirconium Crucible (50-mL capacity).
7.2 Platinum Filter Cone.
8. Reagents and Materials
8.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless ot
...