Porous ceramic monoliths based on diatomite

Šaponjić, Aleksandra; Stanković, Miroslav; Majstorović, Jelena; Matović, Branko; Ilić, S; Egelja, Adela; Kokunešoski, Maja

doi:10.1016/j.ceramint.2015.04.046

Cited by 34 publications

(25 citation statements)

References 27 publications

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“…3b) of the superficial part corresponding to the kaolin layer and in figure 3c) and 3d), those of the diatomite-kaolin layer. Here we can see laminar particles of kaolin spinels, which are formed at approximate temperatures of 750°C, as well as complete and fractured diatoms with radial symmetry and diameter of tenths of microns, which have porosities of the order nanometer In general, the morphology observed in samples using SEM, is typical of porous membranes [9] and ceramics providing porosity, stability at high temperatures, mechanical properties, low creep rate, low expansion coefficient and thermal conductivity, as well as corrosion resistance provided by the diatomite and kaolin [10][11]structures, these properties contribute significantly to the filtration and water treatment processes as evidenced in the reference. [12][13].…”

Section: Resultsmentioning

confidence: 80%

Treatment of subterranean mining water through filtration using ceramic bilayer membranes based of recycled diatomites and kaolin

Rivera¹,

Ayala²,

Rodríguez³

2018

ces

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The treatment of underground wastewater is presented. Used at the San Martín 5 mine in the San Roque sector of the municipality of Sardinata (Norte de Santander-Colombia); through the process of filtration through bilayer porous membrane (diatomite-kaolin / kaolin) based on recycled diatomite from the brewing industry and kaolin. The water samples were looked at before and after the filtration process, taking as reference the maximum values allowed by resolution 0631 of 2015. The analyzed parameters were Suspended solids, BOD5, COD, pH, Fe, dissolved solids. The porous cylindrical ceramics, 5 cm in diameter and 0.9 cm thick, were formed by casting using the plaster mold, where the layer of 100% kaolin with a thickness of approximately 0.3 cm was first deposited. applied the second layer from pulps with weight percentage of 50% recycled diatomite from the brewing industry, 40% kaolin, and 10% calcium carbonate. Once the ceramics are carried out, they are 4438 Silvia Fernanda Rivera-Ortiz et al. subject to the drying process at room temperature for 24 hours, then by means of the forced circulation oven Memmert UF-110 at 100 ° C for an equal time. The sintering of the ceramic was carried out in Vulcan D-130 electric muffle, at a maximum temperature of 1000 ° C for two hours, with a heating ramp of 10 ° C / min. The morphology of the ceramics was studied using scanning electron microscopy (SEM), while physical-ceramic analyzes were performed in accordance with ISO 10545-3. The results show that the ceramic membrane is, in fact, 52% for the reduction of total solids, while the elimination of iron is 38%, on the other hand, it is also evident that the ceramics are not effective in the treatment of dissolved solids with high concentrations.

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Section: Resultsmentioning

confidence: 80%

Treatment of subterranean mining water through filtration using ceramic bilayer membranes based of recycled diatomites and kaolin

Rivera¹,

Ayala²,

Rodríguez³

2018

ces

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“…It has already been shown in our previously published research papers that higher addition of H 3 BO 3 (2 wt%) in the clay and diatomite resulted in a significant increase in their porosity [16][17][18]. The materials made of modified clay and diatomite opens the possibility of designing materials with desired properties, which will be the subject of our future research.…”

Section: Introductionmentioning

confidence: 81%

“…Bimodal distribution of pores is easily noticed in the diatomite sample modified with boric acid, resulting from the combination of the inherent fine porosity of the diatomite grains and larger intra-grain pores. The morphology of sintered samples at 1150 and 1300 ºC, still retains some fragments of the original diatomite honeycomb structure [17,18,27]. According to SEM images (Fig.…”

Section: Scanning Electron Microscope (Sem)mentioning

confidence: 91%

“…The surface morphology has a large number of voids and connected pores between irregularly shaped particles. The microstructure of the sample sintered at 1300 ºC showed pore merging for both applied pressures (40 and 60 MPa) [16][17][18].…”

Section: Scanning Electron Microscope (Sem)mentioning

confidence: 98%

“…According to SEM images (Fig. 3), which compare the porosity of clay and diatomite samples sintered at 1150 °C which is modified with 1 wt% of boric acid, the clay samples have a significant higher pore diameter than diatomite ones [16][17][18]. Fig.…”

Section: Scanning Electron Microscope (Sem)mentioning

confidence: 99%

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Macroporous monoliths based оn natural mineral sources, clay аnd diatomite

et al. 2020

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Macroporous silica ceramic was obtained using clay and diatomite. Boric acid as a low-cost additive in the amount of 1 wt% was used. These porous materials were obtained at low forming pressure (40-80 MPa) and lower sintering temperature (850-1300 ?C) for 4h in air. The influence of boric acid, forming pressure, and sintering temperature on the microstructure, porosity parameters, and mechanical properties of obtained porous monoliths were investigated. As-received and the modified samples were characterized by X-ray diffraction, FTIR, SEM, and mercury porosimetry measurements. As for modified clay and diatomite, they were pressed at 60 MPa and then sintered at 1150 ?C, obtaining porosities of about 10 % and 60 %, respectively. Both of the analyzed samples had the pore diameter in the range of macroporous materials. The pore diameters of clay samples are ranging from 0.1-10 ?m, whereas the pore diameter of diatomite samples was slightly lower with values ranging from 0.05-5 ?m. Modified diatomite samples have a lower Young modulus in comparison to modified clay samples.

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