scholarly journals The use of silicon oxide extracted from rice husk ash as catalyst in magnesium hydrides (MgH2) prepared by mechanical alloying method

2018 ◽  
Vol 1120 ◽  
pp. 012061 ◽  
Author(s):  
Malahayati ◽  
Ismail ◽  
Mursal ◽  
Zulkarnain Jalil

In many rice producing countries of the world, including in Vietnam, various research aimed at using rice husk ash (RHA) as a finely dispersed active mineral additive in cements, concrete and mortars are being conducted. The effect of the duration of the mechanoactivation of the RHA, produced under laboratory conditions in Vietnam, on its pozzolanic activity were investigated in this study. The composition of ash was investigated by laser granulometry and the values of indicators characterizing the dispersion of its particles before and after mechanical activation were established. The content of soluble amorphous silicon oxide in rice husk ash samples was determined by photocolorimetric analysis. The pizzolanic activity of the RHA, fly ash and the silica fume was also compared according to the method of absorption of the solution of the active mineral additive. It is established that the duration of the mechanical activation of rice husk ash by grinding in a vibratory mill is optimal for increasing its pozzolanic activity, since it simultaneously results in the production of the most dispersed ash particles with the highest specific surface area and maximum solubility of the amorphous silica contained in it. Longer grinding does not lead to further reduction in the size of ash particles, which can be explained by their aggregation, and also reduces the solubility of amorphous silica in an aqueous alkaline medium.


2020 ◽  
Vol 9 (1) ◽  
pp. 9-12
Author(s):  
Taufik Taufik ◽  
Zulkarnain A Jalil ◽  
Mursal Mursal

Telah dilakukan penyisipan silika (SiO2) dan nikel (Ni) ke dalam MgH2 dengan menggunakan teknik preparasi mechanical alloying. Hasil observasi dengan XRD menunjukkan bahwa proses pemilingan selama 2 jam material MgH2 + Ni + SiO2 berhasil direduksi hingga skala nanokristal. Fasa yang muncul, dari hasil pengujian dengan XRD adalah fasa MgH2 sebagai fasa utama, sedangkan fasa Ni dan fasa SiO2 sebagai fasa minor. Hasil pengamatan dengan TGA pada sampel MgH2 + 5 %wt Ni + 3 %wt SiO2,hidrogen mengalami desorpsi pada temperatur 362,04oC sebesar 10,3 %wt selama 3,58 menit. Hasil pengamatan pada sampel MgH2 + 5 %wt Ni + 15 %wt SiO2, hidrogen mengalami desorpsi pada temperatur 351,4oC sebesar 10,3 %wt selama 3,77 menit. Silica (SiO2) and nickel (Ni) insertion into MgH2 has been carried out using mechanical alloying preparation techniques. The results of observations with XRD showed that the grinding process for 2 h of MgH2 + Ni + SiO2 material successfully reduced to the nanocrystal scale. The phase that emerges, from the test results using XRD is the MgH2 phase as the main phase, while the Ni and SiO2 phases are minor phases. Observations using TGA on MgH2 + 5% wt Ni + 3% wt SiO2 samples, the hydrogen undergoes desorption at 362.04oC of 10.3% wt for 3.58 min. And the results of observations on MgH2 + 5% wt Ni + 15% wt SiO2 samples, the hydrogen undergoes desorption at 351.4oC at 10.3% wt for 3.77 min. Keywords: Silica, Nickel, MgH2, mechanical alloying, nanocrystal


2014 ◽  
Vol 27 (2) ◽  
pp. 148-160
Author(s):  
Hassan K. Hassan ◽  
Najla J. Al-Amiri ◽  
Mohammed M. Yassen

2018 ◽  
Vol 60 (4) ◽  
pp. 3-7
Author(s):  
Thi To Yen Nguyen ◽  
Phung Anh Nguyen ◽  
Thi Thuy Van Nguyen ◽  
Tri Nguyen ◽  
Ky Phuong Ha Huynh ◽  
...  
Keyword(s):  
Red Mud ◽  

2015 ◽  
Vol 57 (4) ◽  
pp. 370-376 ◽  
Author(s):  
Ahmad Adlie Shamsuri ◽  
Ahmad Khuzairi Sudari ◽  
Edi Syams Zainudin ◽  
Mazlina Ghazali

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3440
Author(s):  
Mohd Na’im Abdullah ◽  
Mazli Mustapha ◽  
Nabihah Sallih ◽  
Azlan Ahmad ◽  
Faizal Mustapha ◽  
...  

The utilisation of rice husk ash (RHA) as an aluminosilicate source in fire-resistant coating could reduce environmental pollution and can turn agricultural waste into industrial wealth. The overall objective of this research is to develop a rice-husk-ash-based geopolymer binder (GB) fire-retardant additive (FR) for alkyd paint. Response surface methodology (RSM) was used to design the experiments work, on the ratio of RHA-based GB to alkyd paint. The microstructure behaviour and material characterisation of the coating samples were studied through SEM analysis. The optimal RHA-based GB FR additive was formulated at 50% wt. FR and 82.628% wt. paint. This formulation showed the result of 270 s to reach 200 °C and 276 °C temperature at equilibrium for thermal properties. Furthermore, it was observed that the increased contents of RHA showed an increment in terms of the total and open porosities and rough surfaces, in which the number of pores on the coating surface plays an important role in the formation of the intumescent char layer. By developing the optimum RHA-based GB to paint formulation, the coating may potentially improve building fire safety through passive fire protection.


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