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Minerals and rocks are considered among materials that found a large use in the different sectors of the human life. Algeria is one of the rich countries in mineral matters. And for exploitation rational of the wealth of our country one was interested in the survey of one of these mineral materials, called the kieselguhr. Kieselguhr or diatomaceous earth consists of the skeletons of diatoms [1]. Instead of carbon; these algae deposit silicates from the water in order to form their skeletons in a precise and symmetrical shape [2]. This material has a considerable economic importance; it is used in several industrial sectors (filtration, the insulation...). The chemical and agro-alimentary industrys are the more consumers sectors of this material and specifically filtrations processes (70% of the world productions are destined to filtrations processes) [3]. This study shows the influence of thermal treatment at 1000 °C on the Morphology and mineral composition of Algerian raw kieselguhr. Pictures of scanning electronic microscope show the structure of particles of the kieselghur as well as the effect of the thermal treatment on the aspect of the particles. The XR study allows us to determine mineralogical composition of the raw kieselghur, which it constitutes by amorphous silica, calcite and the quartz. The thermal treatment leads to the formation of the wollastonite and the trydimite and to calcite desperation. The present work permitted us to know the influence of thermal treatment on the morphology and mineral composition of Algerian kieselguhr.

X-ray and scanning electronic microscopy study of the thermal treatment influences on morphology and mineral composition of Algerian kieselguhr