Characterisation of Patala Formation Coal Reserves of Salt Range and its Application.
The coal deposits, available within the territorial jurisdiction of the Punjab province of Pakistan, belong to Permian and Paleocene age. The Permian coal-rather sparsely available compared to that of Paleocene age (Tertiary era) is mined out in suburbs of district Mianwali of western salt range whereas the Patala formation of Late Paleocene in central and eastern salt range and Hangu formation of early Paleocene age in Makerwal region and Surghar range contain abundant occurrence of the Tertiary coal which is being mined out from different localities within these areas.
This research work aims at the Tertiary coal of Patala formation being mined out in the areas of Wahula (S-I) district Chakwal, Dandot (S-II) and Padhrar (S-III) district Khushab in central salt range by a Provincial Government Agency namely Punjab Mineral Development Corporation (PMDC) that, for operational needs, has divided each site into several subunits consisting of group of mines (Fig. 1-2).
Geological settings. Lithologically, the Late Paleocene Patala formation in Upper Indus Basin contains Calcareous Shale with alternative coal seams whereas, in study area it comprises of Greenish Grey Carbonaceous Shale with occasional Pyritic nodules; marl and white to grey nodular limestone while coal is present in abundance in middle part of the rock unit.
The town of Balkasar has the type-locality of the Patala formation where it is 27 to 109 meters thick and make topographic depressions and gentle inclines. Its lower contact with early Permian Warch Sandstone is Unconformable and is marked by a Muscovite bearing Lateritic band while it has conformably transitional upper contact with Middle Eocene Nammal formation. The Foraminifera fossils are found in abundance in Patala formation with ~ssilina nautilus, Montlivaittia and Rhotalia are the common species that make the premise for the age attributed to it i.e., Late Paleocene. Fatmi (1973) describes the Patala formation to have deposited in Marine to lagoonal setting. While, more recently a detailed work by Kazmi and Abbasi (2008) suggested an off-shore back barrier depositional set-up for it.
Methodology. The laboratory analyses were performed on all coal samples in strict compliance to the pertinent ASTM codes viz. ASTM D 4749 for sieve analysis, ASTM D 3173 for percentage moisture contents (MC) (%), ASTM D 3175 volatile matter (VM) (%) and ASTM D 3174 for ash contents (AC) (%). Fix carbon percentage was calculated using simple arithmetic (sum of MC, VM and AC subtracted from 100). The ultimate analysis on the samples was conducted following the instructions as laid down under ASTM D 5373-08.
Results and Discussion
Under proximate-analysis (Table 1) all of the (17) specimens were tested for moisture contents (MC), volatile matter (VM), fixed carbon (FC) and ash contents (AC), while, under elemental analysis (Table 2) percentages of hydrogen, nitrogen, sulphur and oxygen present in the samples were evaluated so as to determine the suitability of this coal for various industrial and applied purposes.
On average the percentage of carbon in the samples, as found out by elemental analysis is 50.60% which is dismally low. A comparison of three sites indicate that percentage of carbon is maximum i.e., 54.36% in samples from site-III (Padhrar area) and minimum i.e., 47.4% in samples collected from site-I (Wahula areas). The sulphur content an undesired element as far as coal quality is concerned, however, also follows the same pattern with site-III bears the highest value i.e., 9.31% and site-I bears lowest i.e., 4.20%. The average sulphur value for all the samples combined stands as high as 6.24% which speaks volumes of the unsuitability of this coal for any advance industrial use unless treated appropriately.
Coal categorized in anthracite, bituminous and lignite ranks depending on the value of C, H and O contents after Perry's reference coal analysis table as given in Table 3 (Ismat, 2013).
The results of the elemental analysis, when compared to the reference values as given in Table 3 made it evidently clear that the coal present in Patala Formation in central salt range qualifies hardly to be Lignite or in stricter sense actually stands between Peat and Lignite categories of Perry's classification.
Conclusion and recommendations
* The coal quality of Patala formation (Late Paleocene) of eastern and central salt range, Punjab province is categorized as Lignite (Low quality).
* Average value of GCV of eastern and central salt range is 3656 Kcal/kg, but it changes from 2853 to 4973 Kcal/kg.
* Ultimate analysis of salt range coal deposits provides the average percentage of C, H, N and O as 50.60, 4.9, 0.95 and 16.35, respectively.
* General the coal reserves of salt range comprises high proportion of volatile matter, ash, and sulphur varies from 23.56 to 34.74%, 40.32 to 63.21% and 3.91 to 10.4%, correspondingly.
* Coal deposits of Patala formation contains appropriate percentage of moisture which fluctuates from 4.32 to 9.28.
* Salt range coal reserves of Punjab province could be precisely applicable in all varieties of coal boiler, brick plant, briquetting, cement factories, paper mills and chemical industries.
* Patala formation coal of salt range contains high percentage of sulphur, so it might be utilized in power generation and steel industries after blending with high quality coal and desulphurization.
* It is endorsed that homegrown coal deposits of Patala formation can be consumed in coal fired power plants by combination with high rank coal, to overwhelmed the energy adversities.
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Hafiz Muhammad Zulfiqar Ali (a*), Aun Zahoor (a), Hafiz Muhammad Zaheer Afzal (a) and Muhammad Yasin (b)
(a) Geological Survey of Pakistan, Sariab Road, Quetta, Pakistan
(b) Space and Upper Atmosphere Research Commission, Quetta Cantt, Pakistan
(received May 23, 2017; revised November 17, 2017; accepted March 5, 2018)
(*) Author for correspondence; E-mail: email@example.com
Table 1. Proximate analysis of Patala formation coal reserves salt range Study area (site) Moisture Ash Volatile Fix GCV contents contents matter carbon kcal/kg (%) Site-III 5.07 42.33 27.64 25.06 3884 Site-II 6.26 49.44 24.25 20.12 3298 Site-I 5.14 43.20 22.75 22.75 3959 Average value 5.49 44.99 24.88 22.64 3713 Table 2. Ultimate analysis of Patala formation coal reserves salt range Project Name Carbon Hydrogen Nitrogen Sulphur Oxygen (%) Site-III 54.36 4.5 1.06 9.31 14.45 Site-II 50.05 5.3 0.97 5.22 18.3 Site-I 47.4 4.9 0.83 4.20 16.3 Average value 50.60 4.9 0.95 6.24 16.35 Table 3. Coal classification reference standards based on C, H & O % after Perry (1963) Parameters Peat Lignite Bituminous Anthracite C 50 65 88 94 H 5.9 5.2 4.6 3.4 O 34 28 7 2.5 Table 4. Apparent density of Patala formation coal salt range (g/mL) Sample No. Site-III Site-II Site-I (Padhrar) (Dandot) (Wahula) 1 1.351 1.333 1.325 2 1.365 1.351 1.341 3 1.357 1.357 1.317 Average value 1.357 1.347 1.327 Apparent density value of the samples from three sites (S-III, S-II, S-I) varies from 1.327 to 1.357 g/mL, as S-III>S-II > S-I. Table 5. Application of low quality coal in industrial sectors Utilization Type of coal Present research remarks Power generation Bituminous and Coal of Site-I can be applicable by sub bituminous blending with high rank coal and limestone. Steel production Low sulfur coal The coal of all 3 sites may be used only after desulphurization. Liquid fuel Low sulfur and Suitable after the calculation of N nitrogen values and desulphurization Coal boiler Lignite and Valid for all kinds of coal boilers bituminous by mixing with Ca[Co.sub.3] mixture Briquetting Lignite Adequate for coal briquettin Brick plant Lignite and sub Appropriate for brick factory bituminous Domestic Bituminous and May create serious health issues due anthracite to high % of sulphur Cement factory Lignite and sub Acceptable for cement industries bituminous
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|Author:||Ali, Hafiz Muhammad Zulfiqar; Zahoor, Aun; Afzal, Hafiz Muhammad Zaheer; Yasin, Muhammad|
|Publication:||Pakistan Journal of Scientific and Industrial Research Series A: Physical Sciences|
|Date:||May 1, 2018|
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