• Rajat Bhardwaj
• Dr. Devesh Khandelwal

Pet coke is produced during the refining of Crude Oil from petro-refineries. It is carbon rich waste generated during the cracking process of the crude oil in which long chain hydro-carbons are splitted into shorter chain hydro-carbons units termed as “coke”. This ‘pet coke’, is rich in sulphur and other carcinogenic heavy metals and is used as a fuel in Pet coke based power plants having CFBC (Circulating Fluidized bed combustion boilers).CFBC boiler’s have the lime stone feed to capture harmful sulphur present in pet coke and prevent it from releasing in the atmosphere. These SO₂ when mixed in air it is prime pollutant and is governed by the environmental laws. Therefore it is mandatory to control the emission of this suphur into atmosphere. For controlling harmful gasses emissions limestone powder is added during the combustion of pet coke. The sulfur released during this combustion process, is trapped by the added limestone and so the produced Pet coke fly ash after combustion is rich in SO₃. During cement manufacturing process Natural Gypsum is added as a setting time retarder, and main source of SO₃ in cement mix. We will replace this source of SO₃, with that of pet coke. The physical, chemical and morphological characterization of both natural gypsum and pet coke fly ash (PCFA) showed similarities. Based on the lab results, we suggest that the Pet coke fly ash (PCFA) is a suitable alternative to replace natural gypsum partially. The setting time with the PCFA showed about 1 hr delay compared with natural gypsum and its effect on compressive strength depends on the composition of the mixtures, reaching a maximum values for the mixture of 1.5 wt% natural gypsum and 2 wt% PCFA. As per the results obtained of leaching and solubilization tests PCFA can be classified as non hazardous and non inert and can be mixed along with natural gypsum and can help in cost controls. The paper deals management of Ash waste generated by the pet coke based power plants.

Pet Coke Fly Ash Calcium sulfate hemihydrates Cement mixes Waste management

"Analyzing use of Pet coke Fly Ash (PCFA) as an additive setting time retarder for Cement mixes.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.346-352, June 2019, Available :http://www.jetir.org/papers/JETIR1907G95.pdf

"Analyzing use of Pet coke Fly Ash (PCFA) as an additive setting time retarder for Cement mixes.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp346-352, June 2019, Available at : http://www.jetir.org/papers/JETIR1907G95.pdf