Revista de Ciências e Engenharia de Materiais

The Co-Grinding of Z/Cao/Al(OH)₃(Z=ZnO Or Zn₄CO₃(OH)₆) Powder Compositions as Technique for Preparation of Sorbents

Abstract

Prokof’ev V Yu, Gordina NE and Efremov AM

The co-grinding processes for ZnO/CaO/Al(OH)3 and Zn4CO3(OH)6/CaO/Al(OH)3 powder compositions in a vibratory mill with an impact-shear loading were studied. The solid phase was investigated by the methods of X-ray diffraction, IR spectroscopy, scanning electron microscopy, synchronous thermal analysis and other methods. It was found that the formation of new Ca(Zn2(OH)6) phase takes place only in the ZnO-containing mixtures. The detected calcium hexahydroxodizincate dehydrate crystals had a prismatic shape. The experimental data showed also that the co-activation process is accompanied by the hydration of the particle surface due to the alignment of the basic properties of the initial compositions. The amount of gibbsite in the composition influences the changes in a crystal structure. The co-grinding of both compositions allows one to obtain the pellets which keep the mechanical durability after the saturation with HCl vapors. It was shown that the compositions with the basic zinc carbonate are characterized by the higher absorption capacity for the HCl vapors.