Study of the physico-chemical properties of sorbents obtained by the activation of coke fines in a carbon dioxide atmosphere
DOI:
https://doi.org/10.15328/cb2025_65Keywords:
coke fines, sorbent, activation, sorption capacity, specific surface, adsorbentAbstract
The possibility of obtaining activated carbons from low-liquid fractions of carbonized materials from the coke chemical production of JSC "Shubarkol Komir" (Karaganda) has been studied. To obtain a coal sorbent, coke fines with a size of less than 10 mm were crushed and sieved to obtain a fraction of 2-5 mm. The resulting fraction was activated on a pilot plant in the presence of carbon dioxide at temperatures of 700-900°C and an activation time of 60-180 min. It was found that the maximum sorption capacity is achieved at a temperature of 800°C and an activation time of 180 min. Under these conditions, the maximum sorption capacity for iodine (56.73%) and methylene blue (100 mg/g) is achieved. Using the method of low-temperature nitrogen adsorption using the BET method, the specific surface area of the sorbent was determined, which was 446.8±4.4 m2/g. The analysis of the adsorption and desorption branches of the isotherm indicated the mesoporous structure of the obtained sorbents. The study of the exhaust gas composition showed the presence of hydrogen, carbon monoxide, carbon dioxide and nitrogen. An analysis of the gas composition of the waste activation products revealed a significant CO content (51.52%), which indicates a deep thermal modification of coke fines during activation by carbon dioxide CO2.
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