Valorization of Geothermal Silica and Natural Bentonite through Geopolymerization: A Characterization Study and Response Surface Design

Petrus, Himawan Tri Bayu Murti; Olvianas, Muhammad; Astuti, Widi; Nurpratama, Muhammad Istiawan

doi:10.14716/ijtech.v12i1.3537

Cited by 6 publications

(4 citation statements)

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“…The significant difference in the infrared (IR) spectra (Figure ) is a confirmation of the formation of new bonds due to the presence of new phases. The main band in Figure occurs at 929–950 cm –1 , and it is a result of the asymmetric stretching of the Si–O–Si (Al) band of the geopolymer structure . First of all, the shift of the asymmetric Si–O–Si (Al) peak to lower wavenumbers (1037 cm –1 to 929 cm –1 to 950 cm –1 ) is an indication that geopolymerization has occurred, but the reduction in the intensity of the peak in this region with increasing curing temperature would suggest a breakdown of the gel structure. , This would be responsible for the observed loss in strength reported by several authors for geopolymers subjected to higher curing temperatures.…”

Section: Resultsmentioning

confidence: 99%

Effect of Elevated Temperature on the Microstructure of Metakaolin-Based Geopolymer

2022

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Currently, geopolymer is being considered as a future oil-well cement. For wellbore applications, geopolymers are initially tested at specific temperature conditions. However, an oil-wellbore may experience a sudden increase in temperature which may adversely affect geopolymer systems designed for low to moderate temperature conditions. In this work, the effect of elevated temperatures on the microstructure of the geopolymer was simulated. Metakaolin-based geopolymer systems cured at 163 °F for 48 h were subjected to a temperature ramp of 194 °F and 248 °F for 24 h. X-ray diffraction, Fourier transform infrared spectroscopy, and thermogravimetry analysis techniques were used to study the microstructural changes. The analytical techniques show the formation of new crystalline phases when the geopolymer cured at 163 °F was suddenly exposed to higher temperatures. These crystalline phases, for instance, gobbinsite and anorthite, observed in the microstructure have the potential to cause thermal stress, weaken the system, and ultimately affect the geopolymer’s ability to effectively isolate the formation and support the casing.

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Section: Resultsmentioning

confidence: 99%

Effect of Elevated Temperature on the Microstructure of Metakaolin-Based Geopolymer

2022

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“…Many studies have already been conducted to synthesize nanosilika [8,15]. Nano silica is very useful in various aspects of life such as in the manufacture of concrete, catalysts and visualization of latent fingerprints [16][17][18][19][20][21][22]. Research related to efforts to reduce silica content in geothermal brine has also been carried out a lot [23][24][25][26].One of the methods is called sol-gel.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Nano Silica Formation from Geothermal Silica Using Co-Precipitation Method

Syauqi,

Astuti,

Jennie

et al. 2023

SSP

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Nanosilica is a nanotechnology product with many substantial functions in many industries. Previous research showed that nano silica can be synthesized from geothermal silica, that caused silica scaling in injection well and turbine in geothermal power plant, reducing its power plant capacity by 40%. This research used geothermal silica as a precursor for nanosilica production with co-precipitation to recover amorphous silica from silica geothermal to reduce scaling while also increasing its economic value. The objectives of this study were to determine the model to represent the co-precipitation method for nano-silica by using nucleation and growth modelling, therefore help the scale-up process of nanosilica production. The experiment was conducted in four steps. (1) Silica washing utilized distillate water with a ratio of water to silica of 10:1 and sulfuric acid of 20% with a ratio of acid to silica of 4:1, both as a washing agent. (2) Preparation of HCl with concentrations of 3% and 9%. (3) Preparation of sodium silicate solution by reacting washed silica and NaOH to obtain sodium silicate. (4) Preparation of primary and secondary sodium silicate by diluting sodium silicate by two and four times to obtain primary and secondary sodium silicate, respectively. (5) Precipitation of sodium silicate with HCl consists of two steps using primary and secondary sodium silicate. The result showed that the model fit concentration data, with Sum of Squared Error (SSE) 1.9297.10-4, mass transfer coefficient rate is 9.8.10-3 dm/min, and the average relative error is 3.5%.

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“…The impression of the second-order functions is because of the low-order processes are powerful, since generating the corresponding response surface is fast and cheap. (Boulandet & Lissek, 2010;Hawashi et al, 2019;Petrus et al, 2021;Saleh et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

An Empirical Model for Optimizing the Sound Absorption of Single Layer MPP Based on Response Surface Methodology

Esraa¹,

putra²,

Mosa³

et al. 2022

IJTech

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Micro-perforated panel (MPP) is a thin panel absorber capable of absorbing sound energy at a targeted frequency range by adjusting the MPP parameters. An analytical model is available, but it is not a direct, convenient method for practitioners to determine the required MPP parameters. This paper presents an optimized empirical model to calculate the sound absorption coefficient of a single-layer MPP. The response surface methodology is employed for a simple case to generate a second-order polynomial model through a sequence of designing processes to analyze the functional relationships and variation of the outcome performance (sound absorption coefficient) concerning the MPP parameters, namely the panel thickness, hole diameter, perforation ratio, and the depth of the back air layer. The analysis is carried out for frequencies between 300 to 900 Hz. The predicted data (empirical) is compared with the actual data (analytical), leading to a coefficient of variation of 0.145%. The proposed empirical model can be used as a method to select the suitable MPP parameters according to the targeted frequency bandwidth of absorption with less computational time.

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Valorization of Geothermal Silica and Natural Bentonite through Geopolymerization: A Characterization Study and Response Surface Design

Abstract: Figure S1FTIR spectra of geothermal silica, bentonite and geopolymer specimens.

Cited by 6 publications

References 0 publications

Effect of Elevated Temperature on the Microstructure of Metakaolin-Based Geopolymer

Effect of Elevated Temperature on the Microstructure of Metakaolin-Based Geopolymer

Modelling of Nano Silica Formation from Geothermal Silica Using Co-Precipitation Method

An Empirical Model for Optimizing the Sound Absorption of Single Layer MPP Based on Response Surface Methodology

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