Question: Consider the following statement:
- Fly ash is a coal combustion product.
- Silicon dioxide (SiO2), aluminium oxide (Al2O3) and calcium oxide (CaO) are the main mineral compounds of coal-bearing rock strata.
Choose the correct one:
(a) Only(1)
(b) Only(2)
(c) Both (1) and (2)
(d) None of the above
Answer:(c)
Related facts:
Context:
- Reliance Power’s Ultra Mega Power Project’s (UMPP) in Sasan area of Singrauli fly ash dyke collapsed .
- The flood of the toxic ash slurry from the collapsed dyke located in adjoining Harhawa village washed away six persons, including three kids, a woman and two men living in the adjoining villages.
Fly Ash:
- Popularly known as Flue ash or pulverised fuel ash, it is a coal combustion product.
Composition:
- Composed of the particulates that are driven out of coal-fired boilers together with the flue gases.
- Depending upon the source and composition of the coal being burned, the components of fly ash vary considerably, but all fly ash includes substantial amounts of silicon dioxide (SiO2), aluminium oxide (Al2O3) and calcium oxide (CaO), the main mineral compounds in coal-bearing rock strata.
- Minor constituents include: arsenic, beryllium, boron, cadmium, chromium, hexavalent chromium, cobalt, lead, manganese, mercury, molybdenum, selenium, strontium, thallium, and vanadium, along with very small concentrations of dioxins and PAH compounds. It also has unburnt carbon.
Links:
https://www.newindianexpress.com/nation/2020/apr/11/third-fly-ash-dyke-collapse-in-madhya-pradesh-within-8-months-kills-two-four-more-feared-dead-2128706.html
https://timesofindia.indiatimes.com/city/bhopal/reliance-power-plants-dyke-collapse-3rd-body-found-3-still-missing/articleshow/75138697.cms