Document 3QywLapG7rGYj6m4vngbkL5dn
FILE NAME: RT Vanderbilt (RTV) DATE: 1981 Jan 29 DOC#: RTV099 DOCUMENT DESCRIPTION: Inter-Office Memo - NYTAL Contains Tremolite
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' . FER
INTER-OFFICE MEMORANDUM
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To:
Dr. C.S. Thompson
Date:
January 2 9 , 1 9 8 1 .
From: K. C. Rieger
Subject: Mineralogy of NYTAL 300 (EC-1) and NYTAL 400 (EC-2)
"
project Code 00554-2-30-04 - Basic Mineralogy of All RTV Crude
,
Ores and All Mineral products
Introduction;
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A round-robin test was performed on NYTAL 300 and NYTAL 400.
The careful splitting program conducted by A. M, Harvey resulted
in samples for E.M.V., Mccrone, the Bureau of Mines, and RTV,
The question was if there was any detectable asbestos in the
product.
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McCrone's data, using light microscopy.,states 10-15%
tremolite-aotinolite(90% fibrous) in EC-1 and 7-10% tremolite-
actinolite(100% fibrous) in EC-2.
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The purpose of this work is to determine the approximate quantity of tremolite in these products, which is obviously considerably higher than the numbers indicated by McCrone.
Procedure:
The samples were randomized in three different directions, to determine the reproducibility and compensate for the fact that no rotating sample holder was used. The net peak height (NPH) was recorded for selected peaks for tremolite, talc, serpentine, anthophyllite, anthophyllite s' calcite, dolomite?, and diopside? The NPH for the later two minerals has been very small and a positive identification based on the major peak only is uncertain.
Subsequently, the samples were treated with dilute KCl (1 part HC1 - 1 part water by weight) using our standard acid solution procedure(10 g. - 18.5 cc HC1 solution, 2 hour digestion stirring every 15 minutes and washing with warm distilled water),
Since the material was limited, a short acid treatment was devised using one gram of material, 5 ml. acid solution for 1 minute before washing with warm distilled water.
WES000841
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EC-1 and EC-2 were submitted to the Analytical Department including the samples obtained after "short" and "regular" acid solubility test .for a CaO analysis.
The purpose was to have some back up data for semi-quantifi cation of tremolite using XRD. The following minerals can contribute to CaO:
tremolite* calcite dolomite diopside
CaO
13.4% 56.0 30.4 23.0%
*major constituent in tremolitic talc, while calcite may be present in trace quantities, and dolomite and diopside in minute trace quantities.
Results:
The net peak height for the minerals present in EC-1 and EC-2 are recorded in Table 1,- 1A, and Table 2, 2A respectively.
The peaks chosen for semi-quantifioation are based on earlier work which shows that certain peaks are less susceptibe to NPH changes with different particle size ranges.
If we use -325 m tremolite as our standard(Table 3) and average the percentage tremolite, we come to:
62% for EC"1(N-300)
55% for EC-2(N-400)
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The percent range in our MSD sheets is recorded as 40-60% non-asbestiform tremolite and/or anthophyllite.
The data indicate that during the acid solubility test, tremolite, talc, and anthophyllite were not affected, while calcite was eliminated, and the potential traces of dolomite were reduced. Serpentine may have been affected by the acid treatment.
EC-1
EC-2
Acid Solubility: short treatment regular procedure
8% 5.9%
8% 9.5%
The CaO data obtained from the Analytical Department would indicate a 52.6% tremolite content for EC-1 and a 43.4% tremolite content for EC-2 if all the CaO content would be reported as tremolite.
This would indicate that our XRD .-results were somewhat over
estimated (-^*10%).
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Conolusion: The tremolate content in EC-1 is -53% and in e C-2 -~43%.
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I. A.
Gibbs M. Harvey
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