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ASTM E2296-03(2013)

(Practice)

Standard Practice for Silver Corrections in Metal Bearing Ores, Concentrates, and Related Metallurgical Materials by Fire Assay Slag Recycling and Cupel Proof Gravimetry

Standard Practice for Silver Corrections in Metal Bearing Ores, Concentrates, and Related Metallurgical Materials by Fire Assay Slag Recycling and Cupel Proof Gravimetry

SIGNIFICANCE AND USE
5.1 This practice is primarily intended to be used for the correction of silver loss in the fire assay process. Silver contents are determined by fire assay for the purpose of metallurgical exchange between buyer and seller. It is assumed that all who use this practice will be trained analysts capable of performing skillfully and safely. It is expected that work will be performed in a properly equipped laboratory under appropriate quality control practices such as those described in Guide E882.
SCOPE
1.1 This practice covers the silver loss correction, utilizing slag recycling and cupellation of proof silver during the fire assay of metal bearing ores, concentrates, and related metallurgical materials.  
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 and health practices and determine the applicability of regulatory limitations prior to use. (See Practices E50 and ISO 35:1989.)

General Information

Status
Historical
Publication Date
30-Sep-2013
ICS
73.060.99 - Other metalliferous minerals
Technical Committee
E01 - Analytical Chemistry for Metals, Ores, and Related Materials
Drafting Committee
E01.02 - Ores, Concentrates, and Related Metallurgical Materials
Current Stage
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ASTM E2296-03(2013) - Standard Practice for Silver Corrections in Metal Bearing Ores, Concentrates, and Related Metallurgical Materials by Fire Assay Slag Recycling and Cupel Proof GravimetryASTM E2296-03(2013) - Standard Practice for Silver Corrections in Metal Bearing Ores, Concentrates, and Related Metallurgical Materials by Fire Assay Slag Recycling and Cupel Proof Gravimetry
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ASTM E2296-03(2013) - Standard Practice for Silver Corrections in Metal Bearing Ores, Concentrates, and Related Metallurgical Materials by Fire Assay Slag Recycling and Cupel Proof Gravimetry
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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: E2296 − 03 (Reapproved 2013)
Standard Practice for
Silver Corrections in Metal Bearing Ores, Concentrates, and
Related Metallurgical Materials by Fire Assay Slag Recycling
and Cupel Proof Gravimetry
This standard is issued under the fixed designation E2296; 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 ISO 10378:1994 Copper Sulfide Concentrates—
Determination of Gold and Silver Contents—Fire Assay
1.1 This practice covers the silver loss correction, utilizing
Gravimetric and Atomic Absorption Spectrometric
slag recycling and cupellation of proof silver during the fire
Method
assay of metal bearing ores, concentrates, and related metal-
lurgical materials.
3. Terminology
1.2 The values stated in SI units are to be regarded as
3.1 Definitions—For definitions of terms used in this
standard. No other units of measurement are included in this
practice, refer to Terminology E135.
standard.
1.3 This standard does not purport to address all of the
4. Summary of Practice
safety concerns, if any, associated with its use. It is the
4.1 In the process of fire assay fusion, the slag is retained
responsibility of the user of this standard to establish appro-
from the initial fusion and reprocessed through the fusion
priate safety and health practices and determine the applica-
procedure. The resulting lead button is combined with the
bility of regulatory limitations prior to use. (See Practices E50
preliminary lead button during cupellation. Proof silver is
and ISO 35:1989.)
carried through the cupellation procedure to determine the
4 5
silver losses. (See ISO 10378:1994, Bugbee, and Smith .)
2. Referenced Documents
2.1 ASTM Standards:
5. Significance and Use
E29 Practice for Using Significant Digits in Test Data to
5.1 This practice is primarily intended to be used for the
Determine Conformance with Specifications
correction of silver loss in the fire assay process. Silver
E50 Practices for Apparatus, Reagents, and Safety Consid-
contents are determined by fire assay for the purpose of
erations for Chemical Analysis of Metals, Ores, and
metallurgical exchange between buyer and seller. It is assumed
Related Materials
that all who use this practice will be trained analysts capable of
E135 Terminology Relating to Analytical Chemistry for
performing skillfully and safely. It is expected that work will
Metals, Ores, and Related Materials
be performed in a properly equipped laboratory under appro-
E882 Guide for Accountability and Quality Control in the
priate quality control practices such as those described in
Chemical Analysis Laboratory
3 Guide E882.
2.2 ISO Documents:
ISO 35:1989 Certification of Reference Materials—General
6. Apparatus
and Statistical Principles
6.1 Assay Furnace, capable of temperatures up to 1100 °C,
accurate to 6 5 °C with draft controls.
This practice is under the jurisdiction of ASTM Committee E01 on Analytical
6.2 Analytical Balance, capable of weighing to 0.001 mg.
Chemistry for Metals, Ores, and Related Materials and is the direct responsibility of
Subcommittee E01.02 on Ores, Concentrates, and Related Metallurgical Materials.
6.3 Hammer, blacksmith type.
Current edition approved Oct. 1, 2013. Published October 2013. Originally
approved in 2003. Last previous edition approved in 2008 as E2296 – 03 (2008)ε1.
6.4 Hammering Block, flat steel or iron.
DOI: 10.1520/E2296-03R13.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Bugbee, E. E., A Textbook of Fire Assaying, Third Ed., John Wiley and Sons,
the ASTM website. Inc., Hoboken, NJ, 1946.
3 5
Available from International Organization for Standardization (ISO), 1, ch. de Smith, E. A., The Sampling and Assay of the Precious Metals, Second Ed.,
la Voie-Creuse, CP 56, CH-1211 Geneva 20, Switzerland, http://www.iso.org. Charles Griffin and Co., Ltd., 1947.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E2296 − 03 (2013)
TABLE 1 Slag Re-Fusion Flux
9.4 Place crucible in the fire assay furnace. Raise the
litharge 55.4 g temperature to 1060 °C. After the furnace obtains that
sodium carbonate 9.3 g
temperature, hold for at least 30 min. In most instances, the
silica sand 9.4 g
total furnace time will be approximately 1 h. Fusion must be in
potassium bitartrate 7.3 g
borax 18.7 g a liquid state.
NOTE 2—In most cases, the best way to add re-fusion flux is with a wax
paper bag. Place the re-fusion flux into the bag, twist the top, and place on
7. Reagents and Materials
top of the original fusion slag material in the original fire assay crucible.
7.1 Purity of Reagents—Reagent grade chemicals shall be 9.5 After 1 h, carefully pour th
...

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This specification covers grades of fuel oil intended for use in various types of fuel-oil-burning equipment under various climatic and operating conditions. These grades include the following: Grades No. 1 S5000, No. 1 S500, No. 2 S5000, and No. 2 S500 for use in domestic and small industrial burners; Grades No. 1 S5000 and No. 1 S500 adapted to vaporizing type burners or where storage conditions require low pour point fuel; Grades No. 4 (Light) and No. 4 (Heavy) for use in commercial/industrial burners; and Grades No. 5 (Light), No. 5 (Heavy), and No. 6 for use in industrial burners. Preheating is usually required for handling and proper atomization. The grades of fuel oil shall be homogeneous hydrocarbon oils, free from inorganic acid, and free from excessive amounts of solid or fibrous foreign matter. Grades containing residual components shall remain uniform in normal storage and not separate by gravity into light and heavy oil components outside the viscosity limits for the grade. The grades of fuel oil shall conform to the limiting requirements prescribed for: (1) flash point, (2) water and sediment, (3) physical distillation or simulated distillation, (4) kinematic viscosity, (5) Ramsbottom carbon residue, (6) ash, (7) sulfur, (8) copper strip corrosion, (9) density, and (10) pour point. The test methods for determining conformance to the specified properties are given.
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1.1.2 Grades B6–B20 S5000, B6–B20 S500, and B6–B20 S15 are middle distillate fuel/biodiesel blends for use in domestic and small industrial burners.  
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