PRODUCTION OF FERROMAGNETIC ADSORBENTS FROM SOLID PRODUCTS OF BIOWASTE CARBONIZATION IN A FLUIDIZED BED IN A MEDIUM OF SUPERHEATED WATER VAPOR

Consideration has been given to problems of chemical activation of a solid product of hydrothermal carbonization (hydrochar) of biomass. Pellets from a mixture of poultry litter and straw subjected to carbonization in a fl uidized bed in a medium of superheated water vapor at a temperature of 300o C were impregnated with water solution of ferric nitrate, dried in the air at a temperature of 100^o C, and held for 2 h at a temperature of 300o C for degradation of iron(III) nitrate and its transformation into iron oxides. The pellets were activated at a temperature of 700–800^o C in a horizontal tube furnace in an inert argon atmosphere. The obtained ferromagnetic sorbents have a rather developed system of micro- and mesopores. Furthermore, a twofold increase in the duration of activation results in an 18% increase of the pore specifi c surface, and the rise in the temperature of the activation process leads to an increase in this surface by 45%
Consideration has been given to problems of chemical activation of a solid product of hydrothermal carbonization (hydrochar) of biomass. Pellets from a mixture of poultry litter and straw subjected to carbonization in a fl uidized bed in a medium of superheated water vapor at a temperature of 300o C were impregnated with water solution of ferric nitrate, dried in the air at a temperature of 100^o C, and held for 2 h at a temperature of 300o C for degradation of iron(III) nitrate and its transformation into iron oxides. The pellets were activated at a temperature of 700–800^o C in a horizontal tube furnace in an inert argon atmosphere. The obtained ferromagnetic sorbents have a rather developed system of micro- and mesopores. Furthermore, a twofold increase in the duration of activation results in an 18% increase of the pore specifi c surface, and the rise in the temperature of the activation process leads to an increase in this surface by 45%
Author:  N. S. Muratova, S. N. Kuz′min, O. Yu. Milovanov, A. V. Melezhik
Keywords:  hydrothermal carbonization, hydrocoke, chemical activation, ferromagnetic sorbent
Page:  602-604