ASTM E246-01

Standard Test Methods for Determination of Iron in Iron Ores and Related Materials by Dichromate Titration

SCOPE
1.1 These test methods cover the determination of total iron in iron ores, concentrates, and agglomerates in the concentration range 30 to 95 % iron.
1.2 The test methods in this standard are contained in the sections indicated as follows:
Test Method A--Iron by the Hydrogen Sulfide Reduction Dichromate Titration Method (30 to 75 % Fe)
Test Method B--Iron by the Stannous Chloride Reduction Dichromate Titration Method (35 to 95 % Fe)
Test Method C--Iron by the Silver Reduction Dichromate Titration Method (35 to 95 % Fe)
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 and health practices and determine the applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 5 and in special "Warning" paragraphs throughout these test methods.

General Information

• Status: Historical
• Publication Date: 09-May-2001
• ICS: 73.060.10 - Iron ores
• Technical Committee: E01 - Analytical Chemistry for Metals, Ores, and Related Materials
• Drafting Committee: E01.02 - Ores, Concentrates, and Related Metallurgical Materials

Relations

• Replaces: ASTM E246-95 - Standard Test Methods for Determination of Iron in Iron Ores and Related Materials by Dichromate Titration
• Effective Date: 10-May-2001
• Replaced By: ASTM E246-01(2005) - Standard Test Methods for Determination of Iron in Iron Ores and Related Materials by Dichromate Titration
• Effective Date: 01-May-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E246–01
Standard Test Methods for
Determination of Iron in Iron Ores and Related Materials by
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Dichromate Titration
This standard is issued under the fixed designation E246; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Significance and Use
1.1 These test methods cover the determination of total iron 3.1 The determination of the total iron content is the
in iron ores, concentrates, and agglomerates in the concentra- primary means for establishing the commercial value of iron
tion range 30 to 95% iron. ores used in international trade.
1.2 The test methods in this standard are contained in the 3.2 These test methods are intended as referee methods for
sections indicated as follows: thedeterminationofironinironores.Itisassumedthatallwho
Test Method A—Iron by the Hydrogen Sulfide Reduction use these methods will be trained analysts capable of perform-
Dichromate Titration Method (30 to 75% Fe) ing common laboratory procedures skillfully and safely. It is
Test Method B—Iron by the Stannous Chloride Reduction expected that work will be performed in a properly equipped
Dichromate Titration Method (35 to 95% Fe) laboratory and that proper waste disposal procedures will be
Test Method C—Iron by the Silver Reduction Dichromate followed. Appropriate quality control practices must be fol-
Titration Method (35 to 95% Fe) lowed, such as those described in Guide E882.
1.3 This standard does not purport to address all of the
4. Apparatus, Reagents, and Instrumental Practices
safety concerns, if any, associated with its use. It is the
4.1 Apparatus—Specialized apparatus requirements are
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- listed in the “Apparatus” Section in each test method.
4.2 Reagents:
bility of regulatory limitations prior to use. Specific hazards
statements are given in Section 5 and in special “Warning” 4.2.1 Purity of Reagents—Unless otherwise indicated, all
reagentsusedinthesetestmethodsshallconformtothereagent
paragraphs throughout these test methods.
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grade specifications of theAmerican Chemical Society. Other
2. Referenced Documents
gradesmaybeusedprovideditisfirstascertainedthattheyare
2.1 ASTM Standards: of sufficient purity to permit their use without adversely
2
D1193 Specification for Reagent Water affecting the expected performance of the determination, as
E50 Practices forApparatus, Reagents, and Safety Consid- indicated in the “Precision and Bias” Section. Reagent water
erations for the Chemical Analysis of Metals, Ores, and shall conform to Type II as described in Specification D1193.
3
Related Materials
5. Hazards
E276 Test Methods for Particle Size or Screen Analysis at
No. 4 (4.75-mm) Sieve and Finer for Metal-Bearing Ores 5.1 For precautions to be observed in the use of certain
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reagents and equipment in this test method refer to Practices
and Related Materials
E877 PracticeforSamplingandSamplePreparationofIron E50.
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Ores and Related Materials
6. Sampling and Sample Preparation
E882 Guide for Accountability and Quality Control in the
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6.1 Collect and prepare the test sample in accordance with
Chemical Analysis Laboratory
Practice E877.
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These test methods are under the jurisdiction of ASTM Committee E01 on
Analytical Chemistry for Metals, Ores, and Related Materials and are the direct
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responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal- Reagent Chemicals, American Chemical Society Specifications, American
lurgical Materials. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Current edition approved May 10, 2001. Published July 2001. Originally listed by the American Chemical Society, see Analar Standards for Laboratory
published as E246–64T. Last previous edition E246–95. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
2
Annual Book of ASTM Standards, Vol 11.01. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
3
Annual Book of ASTM Standards, Vol 03.05. MD.
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E246–01
6.2 The test sample shall be pulverized to pass a No. 100 in water and dilute to 1 L. If preferred, this solution may be
(150-µm) sieve in accordance with Test Method E276. To prepared from reagent grade K Cr O , by purifying the salt
2 2 7
facilitate decomposition some ores, such as specular hematite, twice by recrystallizing fr
...