1994-02-28_REVISION - M1988112 ‎(2)‎

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Date: 2/28/1994
• From: KIM LAPATKO
• To: HARRY
• Type & Sequence: TR7
• Media Type: D
• Archive: No

~~
Net NP, kg CaC03/t
2, 5 ~- ~._~_.
0 - -
_ 2 5 ................. ............ ..... ... .............. ..........
_ 5 D ..................................................... .............------..................................... ... ....
_ ~ 5 ........_ ........................................... _............._................................................................. .......
-10 D ..................................................... ......................................................................................... ........
-12 5 ..............................................................---.......................... _................................................_.. .......................
-150 ~ ~ ~ ~ ~ ~ ~ -
Rf R2 R3 R4 Tf T2 T3 T4 TS T6
NAP ®ABA ~ tf od. ABA ®BC F:eseacch
Fig. 1 Comparison of Net NP values from NAP test with other static tests
The average of the standard ABA, Modified ABA, and B. C. Pesearch Initial Net NP
values ranged from a high of 5.5 kg CaC03/t (RK=I) to a low of -136 k,g CaCO,/t (TI--S). For
the three samples with the lowest sulphur content znd Net NP values (RK-1, RK-2, TL-1), the
Net NP values for the NAP Test were very close to those of the other tests. For these samples
the NAP value ranged from 2.5 kg CaCO,/t below the mean of the other three values to 1.6 kg
CaCO;/t above this mean.
As the average Net NP values (standard AEtA, Modified ABA, ]B. C. Research Initial)
decreased from -16 to -136 kg CaCO,/t, the disparit;v with the Net NP val ues generally increased
(Figure 1). With the exception of sample RK-4, the: most disparate NA:P Net NP values ('TL-5,
TL-6) were higher than the average of the values from the other three h~>ts (Figure 1). Similar
trends were observed when the NAP Net NP was afmpared to Net NP vstlues determined based
on sample composition (Figure 2).
The elevated NAP values for samples TLS ~utd TL6 (and to a 1f;:;ser degree, RK-2 and
TL-3) suggest that for these samples the acid production in the NAP vvas less than the APP
values for the other static tests, or the acid consumption in the NAP test exceeded the NP of the
static tests. Incomplete oxidation could lead to underestimation of APP and a resultant NP
elevation for samples TLS and TL6. Samples TLS and TL6 had the highest sulphur contents,
5.0% and 5.8°!0, respectively. Sulphur analyses of four samples, before: and after the peroxide
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