Methods of alkaline activation pretreatment of lignite for production of adsorbents

The article presents studies into the influence exerted by the method of preparation of Kharanor lignite for alkaline activation on the adsorption properties of the resultant product. The alkaline activation procedure involves potassium hydroxide impregnation and thermolysis in the mode of thermal shock at 800 °С. Depending on the nature of the effect, the chemical, mechanical, thermal, physical and mixed-type methods of preparing coal for activation are distinguished. The influence exerted on adsorption properties of produced samples by preliminary thermal treatment of coal–alkaline mixture without decomposition (thermal leaching) and by mechanical treatment, both individually and in combination, is investigated. The qualitative properties of adsorbents produced in alkaline leaching of Kharanor lignite without preliminary treatment as well as with thermal leaching and physical treatment are compared. Thermal leaching of Kharanor lignite enhances its adsorbability relative to iodine by 15–20 %, while physical treatment of coal–alkaline mixture before thermolysis increases adsorbability by 17–33 % as against alkaline leaching without pretreatment. The experimental research proves that thermal leaching (preheating of coal and alkaline mixture and its holding at the temperature of 160 °С) is a promising method to prepare lignite for alkaline activation in production of adsorbents.

Vorsina E. V., Moskalenko T. V., Mikheev V. A. Methods of alkaline activation pretreatment of lignite for production of adsorbents. MIAB. Mining Inf. Anal. Bull. 2021;(121):59—68. [In Russ]. DOI: 10.25018/0236_1493_2021_121_0_59.

Vorsina E. V.¹, Cand. Sci. (Eng.), Senior Research Worker of the Laboratory of Complex Use of Coals;
Moskalenko T. V.¹, Cand. Sci. (Eng.), Senior Research Worker of the Laboratory of Complex Use of Coals, labkiy@mail.ru;
Mikheev V. A.¹, Cand. Sci. (Eng.), Leading Research Worker, acting Head of the Laboratory of Complex Use of Coals;
¹ N. V. Chersky Mining Institute of the North, Siberian Branch, Russian Academy of Sciences, Lenin Ave, 43, Yakutsk, Russia, labkiy@mail.ru.

Vorsina E. V., е-mail: labkiy@mail.ru.

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