Preparation and acid erosion mechanism of lithium mica slag non-fired ceramic filter material
The non-burning ceramic filter material was prepared by grinding and activating lemica powder,and its acid erosion mechanism was studied.After being finely ground and activated,the 28 day activity indices of two types of lithium mica slag reach 87％and 90％,respectively,showing good hydration reaction activity.As the amount of lithium mica slag and expanded perlite in-creases,the strength of the ceramic filter material decreases significantly,and the dosage should not exceed 40％and 10％,respec-tively.The prepared ceramic filter material has a compressive strength of 6.1 MPa and a bulk density of 745 kg/m3.The BET aver-age pore size of the ceramic filter material is 10.2 nm,and the mesoporous average pore size is 10.5 nm,indicating that the BET pores are mainly mesoporous with fewer micropores;Its BET specific surface area reaches 46.9 m2/g,indicating excellent adsorption performance.XRD test analysis shows that the calcite content in ceramsite filter material is reduced from 47.1％to 20.0％after hy-drochloric acid erosion.In order to prepare ceramic filter material which can be used in acidic environment,it is necessary to mod-ify it to improve its acid corrosion resistance.
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