ASTM C1318-15a

Standard Test Method for Determination of Total Neutralizing Capability and Dissolved Calcium and Magnesium Oxide in Lime for Flue Gas Desulfurization (FGD)

SIGNIFICANCE AND USE
5.1 There are existing lime-based flue gas desulfurization units in operation that require a method to measure the oxides available for sulfur dioxide absorption. Dissolved magnesium oxide varies among limes depending on the limestone sources and calcination conditions.
SCOPE
1.1 This test method covers analysis of magnesian, dolomitic and high-calcium limes for total neutralizing capability and dissolved major oxides. Dissolved calcium and magnesium are the major species that neutralize acid under the conditions of the test.  
1.2 The test conditions are chosen to measure the acid-neutralizing capacity of both calcium hydroxide and magnesium hydroxide contained in slaked lime. By controlling the neutralization pH at 6, magnesium hydroxide and magnesium oxide are titrated in addition to calcium hydroxide fraction.  
1.3 This test method also determines the fraction of Mg ions present in the lime that will dissolve under lime flue gas desulfurization (FGD) conditions. Because the Mg2+ ion alters FGD performance, it is important to know its concentration.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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.

General Information

• Status: Historical
• Publication Date: 30-Nov-2015
• ICS: 75.180.20 - Processing equipment
• Technical Committee: C07 - Lime and Limestone
• Drafting Committee: C07.05 - Chemical Tests

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C1318 − 15a
Standard Test Method for
Determination of Total Neutralizing Capability and Dissolved
Calcium and Magnesium Oxide in Lime for Flue Gas
1
Desulfurization (FGD)
This standard is issued under the fixed designation C1318; 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 C110 Test Methods for Physical Testing of Quicklime,
Hydrated Lime, and Limestone
1.1 This test method covers analysis of magnesian, dolo-
C1301 Test Method for Major and Trace Elements in Lime-
mitic and high-calcium limes for total neutralizing capability
stone and Lime by Inductively Coupled Plasma-Atomic
anddissolvedmajoroxides.Dissolvedcalciumandmagnesium
Emission Spectroscopy (ICP) and Atomic Absorption
are the major species that neutralize acid under the conditions
(AA)
of the test.
E11 Specification for Woven Wire Test Sieve Cloth and Test
1.2 The test conditions are chosen to measure the acid-
Sieves
neutralizing capacity of both calcium hydroxide and magne-
sium hydroxide contained in slaked lime. By controlling the
3. Terminology
neutralization pH at 6, magnesium hydroxide and magnesium
3.1 Definitions—Unless otherwise specified, for definitions
oxide are titrated in addition to calcium hydroxide fraction.
of terms used in these test methods refer to Terminology C51.
1.3 ThistestmethodalsodeterminesthefractionofMgions
present in the lime that will dissolve under lime flue gas
4. Summary of Test Method
2+
desulfurization (FGD) conditions. Because the Mg ion alters
4.1 Lime is slaked by boiling and is reacted with acid at a
FGD performance, it is important to know its concentration.
pH and residence time similar to those found in full-scale FGD
1.4 The values stated in SI units are to be regarded as
reaction tanks.
standard. No other units of measurement are included in this
4.2 A sample of lime is titrated with 1N hydrochloric acid,
standard.
maintaining a pH of 6 for 30 min. After 30 min, the acid
1.5 This standard does not purport to address all of the
consumption is recorded. The total neutralizing capacity is
safety concerns, if any, associated with its use. It is the
calculated from the acid consumption and reported as % CaO.
responsibility of the user of this standard to establish appro-
Dissolved magnesium is determined by spectrometry or by
priate safety and health practices and determine the applica-
EDTA titration and reported as percent dissolved Magnesium
bility of regulatory limitations prior to use.
Oxide (as MgO).
2. Referenced Documents
5. Significance and Use
2
2.1 ASTM Standards:
5.1 There are existing lime-based flue gas desulfurization
C25 Test Methods for Chemical Analysis of Limestone,
units in operation that require a method to measure the oxides
Quicklime, and Hydrated Lime
available for sulfur dioxide absorption. Dissolved magnesium
C51 Terminology Relating to Lime and Limestone (as used
oxide varies among limes depending on the limestone sources
by the Industry)
and calcination conditions.
1
This test method is under the jurisdiction of ASTM Committee C07 on Lime
6. Interferences
andLimestoneandisthedirectresponsibilityofSubcommitteeC07.05onChemical
Tests.
6.1 Any substance reacting with acid under the conditions
Current edition approved Dec. 1, 2015. Published January 2016. Originally
of the test will contribute to the total oxide and dissolved oxide
approved in 1995. Last previous edition approved in 2015 as C1318 – 15. DOI:
values.
10.1520/C1318-15A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 Magnesium in forms other than MgO, which dissolve
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
under test conditions, may affect the dissolved MgO and total
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. oxide values.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C1318 − 15a
7. Apparatus 10.2.2 Begin the titration by adding standard 1.0 normal
hydrochloric acid solution. Titrate to and maintain a pH of 6.0
7.1 Digital Readout pH Meter, with combination electrode
within 0.4 pH units for 30 min (Note 2). Time begins from
readable to 0.01 pH units, or an autotitrator with an automatic
initial addition of acid.
temperature compensator capable of titrating to a preset
endpoint (Note 1).
NOTE 2—When doing a manual titration, the increment of acid addition
may require the use of partial drops (suspend a small amount of titrant on
NOTE 1—Use of an auto
...

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.
Designation: C1318 − 15 C1318 − 15a
Standard Test Method for
Determination of Total Neutralizing Capability and Dissolved
Calcium and Magnesium Oxide in Lime for Flue Gas
1
Desulfurization (FGD)
This standard is issued under the fixed designation C1318; 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
1.1 This test method covers analysis of magnesian, dolomitic and high-calcium limes for total neutralizing capability and
dissolved major oxides. Dissolved calcium and magnesium are the major species that neutralize acid under the conditions of the
test.
1.2 The test conditions are chosen to measure the acid-neutralizing capacity of both calcium hydroxide and magnesium
hydroxide contained in slaked lime. By controlling the neutralization pH at 6, magnesium hydroxide and magnesium oxide are
titrated in addition to calcium hydroxide fraction.
1.3 This test method also determines the fraction of Mg ions present in the lime that will dissolve under lime flue gas
++2+
desulfurization (FGD) conditions. Because the Mg ion alters FGD performance, it is important to know its concentration.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C25 Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime
C50 Practice for Sampling, Sample Preparation, Packaging, and Marking of Lime and Limestone Products
C51 Terminology Relating to Lime and Limestone (as used by the Industry)
C110 Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone
C1301 Test Method for Major and Trace Elements in Limestone and Lime by Inductively Coupled Plasma-Atomic Emission
Spectroscopy (ICP) and Atomic Absorption (AA)
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
3. Terminology
3.1 Definitions—Unless otherwise specified, for definitions of terms used in these test methods refer to Terminology C51.
4. Summary of Test Method
4.1 Lime is slaked by boiling and is reacted with acid at a pH and residence time similar to those found in full-scale FGD
reaction tanks.
4.2 A sample of lime is titrated with 1N hydrochloric acid, maintaining a pH of 6 for 30 min. After 30 min, the acid consumption
is recorded. The total neutralizing capacity is calculated from the acid consumption and reported as CaO.% CaO. Dissolved
magnesium is determined by spectrometry or by EDTA titration and reported as percent dissolved Magnesium Oxide (as MgO).
1
This test method is under the jurisdiction of ASTM Committee C07 on Lime and Limestone and is the direct responsibility of Subcommittee C07.05 on Chemical Tests.
Current edition approved June 1, 2015Dec. 1, 2015. Published June 2015January 2016. Originally approved in 1995. Last previous edition approved in 20092015 as
ε1
C1318 – 95 (2009)C1318 – 15. . DOI: 10.1520/C1318-15.10.1520/C1318-15A.
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 ----------------------
C1318 − 15a
5. Significance and Use
5.1 There are existing lime-based flue gas desulfurization units in operation that require a method to measure the oxides
available for sulfur dioxide absorption. Dissolved magnesium oxide varies among limes depending on the limestone sources and
calcination conditions.
6. Interferences
6.1 Any substance reacting with acid under the conditions of the test will contribute to the total oxide and dissolved oxide
values.
6.2 Magnesium in forms other than MgO, which dissolve under test conditions, may affect the dissolved MgO and total oxide
value.values.
7. Apparatus
7.1 Digital Readout pH Meter, with combination electrode readable to 0.01 pH units,
...