The Study of Hydration of Sintered CaO by X-Ray Dif frac tion Method ŠTÚDIUM HYDRATÁCIE SPEKANÉHO CaO CESTOU RTG DIFRAKCIE (original) (raw)
Related papers
Vplyv kryštalizácie síranu sodného na intergranulárnu deštrukciu thassoského mramoru
2012
The paper deals with sodium sulphate crystallization in pore spaces of Thassos marble and presents the 3D visualization of intergranular fractures causing a deterioration of the specimen by the salt crystallization. Cylindrical marble specimen with diameter 20 mm and length 50 mm has been submitted to 15 cycles of the dipping in 14 % solution of mirabilite (Na2SO4·10 H2O) according to the STN EN 12370 standard methodical test. Using electron methods (polarization microscopy, SEM – Scanning electron microscopy, XRD – X-ray diff raction, EMPA – Electron-microprobe analysis) and by monitoring of selected physical parameters (changes in weight and changes in P-waves velocities), in fi rst the mineral composition and microstructure of the marble have been characterized and consequently the eff ects induced by cyclic activity of sodium sulphate with the marble have been analysed. Mercury intrusion porosimetry (MIP) method has been used for specifi cation of the porosity and detail pore st...
2006
Keywords: chal co py rite, ther mal treat ment, sul fur, sulfidation, X-ray dif frac tion phase ana lyse, cop per, leach ing, sul fu ric acid Ab stract The cop per leach ing from chal co py rite is rather com pli-cated pro cess due to its re frac tory na ture. There fore a big ef fort is paid to find more ef fec tive method for this pro cess. One pos si ble method is the ther mal treat ment of raw chal-co py rite ma te rial with sul fur. The cop per from prod ucts of ther mal sulfidation of chal co py rite con cen trate should be better leachable, while iron prod uct could be less leachable, what is an ad van tage. Ther mal sulfidation of the chal co py rite con cen trate was re al ized by heat ing of sam ples at tem per a tures of 300, 350 and 400 °C dur ing 1 hour at nor mal pres sure 0.1 MPa. The used amount of sul phur was 0, 0.5, 1, 2, 3 grams per 3 grams of con cen trate. More over, one sulfidation ex per i-ment was re al ized in evac u ated quartz tube. Achieved prod ucts wer...
Technology applied for revitalization of the Slnečné jazerá Lakes in Senec (town in western Slovakia) produced a temporary landfi ll of pumped and separated fi ne-grained bottom sediments. To minimize disposed waste, landfi lled sediments were analysed and some potential geotechnical and environmental applications were considered. Mineral composition was studied by the X-ray diff ractometry. Grain-size analyses and tests on Atterberg consistency limits allowed the engineering-geological classifi cation: sandy (clayey) silt sa(cl)Si according to EU standards or F3 and F5, symbols MS and MI, according to STN 72 1001. Other tests: moisture, consistency and compactibility; on compacted samples, dry bulk density, compressibility and hydraulic conductivity. Geochemical analyses included: soil reaction pH, cation exchange capacity (CEC), organic matter (C org) and carbonates. Dangerous substances were analysed earlier. Comparison with relevant technical standards and limits given by law fo...
The moisture – a negative deterioration factor of rock mass
The rock mass deterioration is caused by exogenous factors from which the main role play the temperature andmoisture content. A monitoring system of the rock moisture content based on the transient Hot-ball method of measuringof the thermal conductivity of materials was installed on the Perún`s rock at the Spiš Castle. So called, hot ball methodwas used for the estimation of the water content in various depths inside the rock mass in order to assess its eff ect on thetemperature penetration depth beneath the surface, which might control the volumetric change (dilation) of the rock cliffand its stability. The preliminary results showed relation between q/Tm index and the precipitation registered by the nearbymeteorological station. This dependence was manifested in the near subsurface parts of the rock face while the deeper sensorswere not infl uenced. This suggests that the surface parts of the travertine rock body are more prone to the temperaturedilation eff ects and therefore the...
Determination corrosion rate of welded joints realised by MAG technology
Koroze a ochrana materialu, 2017
The paper deals with evaluation the corrosion characteristics of welded joints in two corrosion environments – SARS and 0.1 M NaCl solution. Welds were made by MAG technology using three protective gas mixtures - Ferroline He20C8, Ferroline C18 and Ferroline C6X1. There were realised chemical analysis of the base material and weld metal of all welded joints, Vickers hardness test of the base material, heat affected zones and weld metals, metallographic analysis of all areas of welds and measurement of base and weld metal corrosion rate in two corrosion environments. Hardness increases from the base material through the HAZ to the weld metal. The maximum difference between the hardness of the weld metal and the base material is 36 HV 0.1 - realised welds do not show a notch effect. The corrosion rate of the materials in SARS solution was higher than in the NaCl solution. The corrosion rate in weld metals of all welded joints was lower than the corrosion rate of the base material. The...
Water Supply, 2014
The erosion of the cohesive layers of particulate matter that causes discolouration in water distribution system mains has previously been modelled using the Prediction of Discolouration in Distribution Systems (PODDS) model. When first proposed, PODDS featured an unvalidated means by which material regeneration on pipe walls could be simulated. Field and laboratory studies of material regeneration have yielded data that suggest that the PODDS formulations incorrectly model these processes. A new model is proposed to overcome this shortcoming. It tracks the relative amount of discolouration material that is bound to the pipe wall over time at each of a number of shear strengths. The model formulations and a mass transport model have been encoded as software, which has been used to verify the model's constructs and undertake sensitivity analyses. The new formulations for regeneration are conceptually consistent with field and laboratory observed data and have potential value in t...