ASTM C1318-2015a Standard Test Method for Determination of Total Neutralizing Capability and Dissolved Calcium and Magnesium Oxide in Lime for Flue Gas Desulfurization (FGD)《测定烟道气体.pdf
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1、Designation: C1318 15C1318 15aStandard Test Method forDetermination of Total Neutralizing Capability and DissolvedCalcium and Magnesium Oxide in Lime for Flue GasDesulfurization (FGD)1This standard is issued under the fixed designation C1318; the number immediately following the designation indicate
2、s the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers analysis of magnesian,
3、 dolomitic and high-calcium limes for total neutralizing capability anddissolved major oxides. Dissolved calcium and magnesium are the major species that neutralize acid under the conditions of thetest.1.2 The test conditions are chosen to measure the acid-neutralizing capacity of both calcium hydro
4、xide and magnesiumhydroxide contained in slaked lime. By controlling the neutralization pH at 6, magnesium hydroxide and magnesium oxide aretitrated 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 lim
5、e flue gasdesulfurization (FGD) conditions. Because the Mg+2+ 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 addr
6、ess all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C25 Test Methods
7、 for Chemical Analysis of Limestone, Quicklime, and Hydrated LimeC50 Practice for Sampling, Sample Preparation, Packaging, and Marking of Lime and Limestone ProductsC51 Terminology Relating to Lime and Limestone (as used by the Industry)C110 Test Methods for Physical Testing of Quicklime, Hydrated L
8、ime, and LimestoneC1301 Test Method for Major and Trace Elements in Limestone and Lime by Inductively Coupled Plasma-Atomic EmissionSpectroscopy (ICP) and Atomic Absorption (AA)E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves3. Terminology3.1 DefinitionsUnless otherwise specified, f
9、or definitions of terms used in these test methods refer to Terminology C51.4. Summary of Test Method4.1 Lime is slaked by boiling and is reacted with acid at a pH and residence time similar to those found in full-scale FGDreaction tanks.4.2 Asample of lime is titrated with 1N hydrochloric acid, mai
10、ntaining a pH of 6 for 30 min.After 30 min, the acid consumptionis recorded. The total neutralizing capacity is calculated from the acid consumption and reported as CaO.% CaO. Dissolvedmagnesium is determined by spectrometry or by EDTA titration and reported as percent dissolved Magnesium Oxide (as
11、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 editi
12、on approved in 20092015 asC1318 95 (2009)C1318 15.1. DOI: 10.1520/C1318-15.10.1520/C1318-15A.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document S
13、ummary page on the ASTM website.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. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recomme
14、nds that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15. Significance
15、and Use5.1 There are existing lime-based flue gas desulfurization units in operation that require a method to measure the oxidesavailable for sulfur dioxide absorption. Dissolved magnesium oxide varies among limes depending on the limestone sources andcalcination conditions.6. Interferences6.1 Any s
16、ubstance reacting with acid under the conditions of the test will contribute to the total oxide and dissolved oxidevalues.6.2 Magnesium in forms other than MgO, which dissolve under test conditions, may affect the dissolved MgO and total oxidevalue.values.7. Apparatus7.1 Digital Readout pH Meter, wi
17、th combination electrode readable to 0.01 pH units, or an autotitrator with an automatictemperature compensator capable of titrating to a preset endpoint (Note 1).NOTE 1Use of an automatic titrator is recommended.7.2 Stirrers and Stir Bars.7.3 Inductively Coupled Plasma Spectrometer or Atomic Absorp
18、tion Spectrometer, if not using EDTA titration.7.4 Filtering Funnel, TypeAE glass fiber paper, volumetric flasks (size as needed), 500 mLvolumetric flasks, and various ClassA pipettes.8. Reagents8.1 1.0 Normal Hydrochloric Acid, standardizestandardized using procedures in the section on Available Li
19、me Index in TestMethods C25.8.2 Deionized or Distilled Water, CO2 free.8.3 Calcium and Magnesium Standard Solutions, (commerciallycommercially available or use the procedures in the section onCalcium and Magnesium Oxide (Alternative EDTA Titration Method) in Test Methods C25.8.4 EDTA Standard Soluti
20、on (0.4 %), standardizestandardized according to the procedure in the section on Calcium andMagnesium Oxide (Alternative EDTA Titration Method) in Test Methods C25.8.5 1:1 Hydrochloric Acid, a solution prepared by diluting concentrated Hydrochloric Acid by addition to an approximatelyequal volume of
21、 distilled or deionized water.9. Sample Preparation9.1 The sampling and grinding of any lime sample shall be carried out as rapidly as possible, so that the absorption of moistureand carbon dioxide is held to a minimum.9.2 The sample as received at the laboratory shall be thoroughly mixed and a repr
22、esentative sample with minimum weight of100 g shall be taken and pulverized to pass a 300 m (No. 50) sieve for analysis. Conduct the sieve analysis in accordance withTest Methods C110.9.3 The prepared sample shall be stored in a tightly capped container.10. Procedure10.1 Slaking of Lime Sample:10.1.
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