ASTM C1843-16(2022)

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: C1843 − 16 (Reapproved 2022)
Standard Test Method for
Determining Moisture Content in Uranium-Ore Concentrate
This standard is issued under the fixed designation C1843; 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 3. Terminology
1.1 This test method is used to determine compliance with 3.1 Except as otherwise defined herein, definitions of terms
SpecificationC967fortherequirementsofmoistureinuranium are as given in Terminology C859.
ore concentrates (UOC).Aprocedure is given to determine the
4. Summary of Test Method
approximatetemperature for drying the UOC; normally110 °C
but possibly 165 °C for uranyl peroxides. The dried uranium
4.1 The need to establish an appropriate temperature for
ore-concentrate resulting from this procedure is then used for drying may only occur once for a specific ore concentrate but
performing additional analyses described in Specification
may be evaluated if the property of the ore is suspected to have
C967. changed. An example of a UOC material that may require
drying at 165 °C is uranyl peroxide. Other concentrates, such
1.2 The values stated in SI units are to be regarded as the
as U O,UO , and UO are generally dried at 110 °C.
3 8 2 3
standard. The values given in parentheses are mathematical
equivalents that are provided for information only and are not
4.2 Aweighed portion of uranium ore concentrate sample is
considered standard. placed into an oven that is capable of maintaining a tempera-
ture of 110 °C or 165 °C. The sample is heated and weighed
1.3 This standard does not purport to address all of the
periodically to a constant weight or an insignificant change in
safety concerns, if any, associated with its use. It is the
weight.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4.3 A weight change that is insignificant would be defined
mine the applicability of regulatory limitations prior to use.
by the sample size and the required precision.
1.4 This international standard was developed in accor-
5. Significance and Use
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5.1 The test method within this standard is used to demon-
Development of International Standards, Guides and Recom-
strate uranium ore-concentrate material meets the moisture
mendations issued by the World Trade Organization Technical
specification defined in Specification C967 or other applicable
Barriers to Trade (TBT) Committee.
requirements.
2. Referenced Documents
6. Safety Precautions
2.1 ASTM Standards:
6.1 Proper precautions should be taken to prevent inhalation
C859 Terminology Relating to Nuclear Materials
or ingestion of uranium-ore concentrate during ore evaluation,
C967 Specification for Uranium Ore Concentrate
sample preparation, sample analysis, and sample packaging.
C1022 Test Methods for Chemical and Atomic Absorption
Precautions used to prevent inhalation or ingestion should
Analysis of Uranium-Ore Concentrate
include a ventilation system and personal protective equip-
C1075 Practices for Sampling Uranium-Ore Concentrate
ment. Generally the ventilation system is in the form of
E11 Specification for Woven Wire Test Sieve Cloth and Test
laboratory hoods with a dust collection system. Personal
Sieves
protective equipment used should be a respirator designed for
particulate matter.
This test method is under the jurisdiction ofASTM Committee C26 on Nuclear
7. Apparatus
Fuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods of
Test.
7.1 Drying Oven, capable of maintaining 110 °C or 165 °C.
Current edition approved Feb. 1, 2022. Published March 2022. Originally
approved in 2016. Last previous edition approved in 2016 as C1843 – 16. DOI:
7.2 Desiccator.
10.1520/C1843-16R22.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 7.3 Vacuum Pump, capable of reducing pressure by 34 kPa
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
(5 psi) (25 cm of mercury).
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 7.4 Weighing trays.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1843 − 16 (2022)
7.5 Pulverizer. sample on a second screen with apertures of 0.149 mm (U.S.
Sieve 100 mesh). If material is retained on the 80 mesh screen,
7.6 Blender.
or more than 10 % of the sample on the 0.149 mm (U.S. 100
7.7 Balance, 3000 g capacity, readable to at least 0.1 g.
mesh) screen, repeat the pulverization and blending processes
until this requirement is achieved.
7.8 Sample Jars, glass with metal lids, able to hold 150 g or
as agreed upon.
11.3 Divide the remaining blended material, about 2500 g,
into two roughly equal portions and spread evenly in two
7.9 Test Sieve, 0.177 mm (U.S. Sieve 80 mesh).
stainless steel drying pans.
7.10 Test Sieve, 0.149 mm (U.S. Sieve 100 mesh).
NOTE 1—See Specification E11.
12. Procedure
7.11 Flat Iron, able to heat sample jar lids to ~82 °C.
12.1 Transfer directly two un-pulverized samples of about
8. Reagents 1300 g each, which are designated for the moisture
determination, and spread in two tared drying pans. Weigh the
8.1 Anhydrous Calcium Sulfate or equivalent.
pans and samples, and then place together with the pulverized
and blended samples in adjacent positions in the same oven to
9. Sample Size
minimize temperature and atmosphere differences among the
9.1 The sample size will be determined by the sample
pans. The tare weight of the tray
...