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This study investigated the structure, mineralogical specifics and chemical composition, of a natural and modified diatomite ore, which obtained from the Aktyubinsk /Kazakhstan deposits by using SEM, XRF, XRD, FTIR, TGA and SDTA. Three modified forms of diatomite's were prepared by calcinations at 900 o C and/or calcinations and acidification by 0.5 N HCl (D, D-HCl, D-900 and D-900-HCl). The iron(Fe 2 O 3 ) and silica (SiO 2 ) contents in natural raw diatomite were about 3.9 % and SiO 2 80.23 %doi:10.2174/1874456700903010012 fatcat:qibp7fadb5ba3f35g6blpswv7e