Method for producing granulated ldh sorbent

Abstract

Method for producing granulated lithium aluminum double hydroxide chloride (LDH) sorbent includes feeding a metered amount of LDH powder and a binder into a mixer-granulator. After mixing and the addition of a binder solvent, the following are performed: granulation of the LDH sorbent, air and vacuum degassing of the LDH sorbent, and unloading and screening of the resulting granules. A low-boiling-point chlorocarbon solvent is used as the binder solvent. The binder solvent is recovered by condensation, with a flow of an air-steam mixture being directed through the following loop: mixer-granulator—dust filtration—condensation of the binder solvent—heating of the air-steam mixture—mixer-granulator. Granulation of the LDH sorbent is carried out with the air-steam mixture in the mixer-granulator at 30-40° C. and the air-steam mixture circulating at flow rate of 200-300 h−1. The method reduces the costs of granulating the LDH sorbent and recovering the binder solvent during granulation.

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