Mineralogical characterization of zeolites present on basaltic rocks from Combia geological formation, La Pintada (Colombia)

Mineralogical and chemical investigation of Tunisian phosphate washing waste during calcination

“…Based on different study of the Tunisian phosphate ore [10,12], the clinoptilolite was presented as the main natural zeolite in the ore. Other works [8,31] present the heulandite as the principle natural zeolite. The Heu zeolite-type ''heulandite-clinoptilolite'' was difficult to differentiate between them, while they react upon heating with different ways depending on their structural properties [32,33]. In this investigation, the heulandite is presented as the natural zeolite because its reflection starts to decrease from 600°C until it disappears after thermal treatment but the clinoptilolite retains its state after calcination [32].…”

“…The Heu zeolite-type ''heulandite-clinoptilolite'' was difficult to differentiate between them, while they react upon heating with different ways depending on their structural properties [32,33]. In this investigation, the heulandite is presented as the natural zeolite because its reflection starts to decrease from 600°C until it disappears after thermal treatment but the clinoptilolite retains its state after calcination [32]. The palygorskite is presented with reflection at 10.13 Å , 6.34 Å and 4.41 Å .…”

Effect of the calcinations temperatures of phosphate washing waste on the structural and mechanical properties of geopolymeric mortar

“…6 shows the thermal behaviour of PWW, the first mass loss is 2.350% was at around 100°C coupling by an endothermic peak in the DSC curve corresponds to the remove of adsorbed water (moisture). The second mass loss was between 200 and 550°C with a value $4.69 mass% correspond first to the liberation of the zeolitic water localized in the cavities and channels of the natural zeolite [71] at 203°C leading a structure destruction and a second loss due to the combustion of the organic matter characterized by an exothermic peak at 552°C. The third mass loss is reflecting the decomposition of carbonates calcite CaCO 3 during heating, it reaches a value $9.96% with the release of CO 2 and it is characterized by an endothermic peak at 730°C.…”

Chapter 12

“…These basalts comprise scarce, plagioclase phenocrysts in a vitreous matrix with microliths of plagioclase and pyroxene (Figure 6). Fractures and vesicles are filled with slightly oxidized zeolites, mainly heulandite, chabazite, mordenite, and philipsite, but celadonite, quartz, and calcite are also present (Gelves et al, 2016).…”