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Shahr El-Dina et al. (2018) has successfully shown that 92.8% of P2O5 was removed from Egyption monazite using alkaline digestion.
Other metals such as Si, Al, S and others have concentration less than wt% in both spots.
AL-Areqi, A.A.
Shahr El-Dina, E.H.
Abd El-Ghany, Selective separation of thorium from rare earth elements liquor during the alkaline processing of Egyptian monazite concentrate.

Abou-El-Hossein2,b and Chua H.
aahwai_ting@hotmail.com, bKhaled.Abou-El-Hossein@nmmu.ac.za, cchua.han.bing@curtin.edu.my Key words: Ceramics, micromachining, chemical etching.
Williams et al. [5] found that not all materials were etched in all etchants due to time limitations.
The test material, machinable glass ceramics (SiO246/Al.2O316/MgO17/ K2O10/B2O37) was produced by GoodFellow.Inc.
Mimiwaty et al. [13] concluded that temperature was the main effect in their study.

El-Din and Smith [10] also found that the ozonation process was more effective in removing the color and AOX than COD and TOC and it also caused the increase of the biodegradability of the pulp mill effluent.
Verenich et al. [18] also found that ozonation was capable of selectively removing the LWEs from paper mill circulation water.
Ko et al. [21] utilized O3/AC to treat pulp mill effluent and found that reduction of COD increased from 55% of single ozonation to 63%.
El-Din and D.W.
El-Din, D.W.

Conversely, findings of Sadat et al. [12] for turning, Arunachalam et al. [13] for facing suggested that the residual stresses are more tensile with increasing cutting speed.
El-Sonbaty et al. [32] developed ANN models for the analysis and prediction of the relationship between the cutting conditions and the corresponding fractal parameters of machined surfaces in face milling operation. 
[29] El-Wahab, A.I.; Kishawy, H.A.
[32] El-Sonbaty, I.A.; Khashaba, U.A.; Selmy, A.I.; Ali, A.I.
[35] Dweiri, F.; Al-Jarrah, M.; Al-Wedyan, H.

El-Raghy, J.
Kisi, et al., J.
Wu, et al., J.
El-Raghy, J.
Pang, et al., J.

Bahgat et al. [3] have reported that using a Pt-crucible is the most effective procedure against high volatilization of TeO2 at high temperatures.
El.Mallawany, A.
El-Rahamani, E.
EL-Mallawany : Tellurite Glasses Handbook (CRC Press, Boca Raton 2002), chap.9.

Anode p+ layers were fabricated by Al ion implantation (3 × 1020 cm-3).
Fig. 2 shows the observed electroluminescence (EL) images of the SiC pn diode and extended SFs through the anode electrode slit after 2.5 million pulses (TE = 60 s) and 6.1 million pulses (TE = 147 s).
We presume that the nucleation Fig. 2 Observed EL images after (a) TE = 60 s and (b) TE = 147 s.
(c) Observed EL image after stress.

K., Lee W.J., et al., Sens.
Actuators, B Vol. 69, (2000), p. 96 [2] Llobet E., Molas G., Molinas P., el at., J.
[5] Turyan I., Krasovec U.O., Orel B., Saraidorov T., el at., Adv.
B Vol. 108 (2004), p. 15572 [13] Cho M H et al, J.
Zhu, X.J Xu, et al., Small Vol. 2(1) (2006), p. 80 [19] Frey G.L., Rothschild A., Sloan J., Rosentsveig R., et. al., J.

Experiment [SiO2] [mol.L -1] [NaOH] [mol.L-1] Si/Al [mol.
The Si/Al molar ratio of NaLTA and HS zeolites are close to unity which is in agreement with those structures.
The framework of Na-LTA and HS consists of strictly alternating silica and alumina tetrahedra yielding a Si/Al =1, the maximum allowed by Lowenstein's rule [16] which forbids Al-O-Al linkages in aluminosilicates.
El Maksoud, M.
El Gharbi, J.

Thermodynamically, such a description accounts for bond dissociation by reduction of the strain energy in the material, but the reduction of the net chemical potential, and reduction of the surface free energy are also necessary, as shown in detail by Sergo et al. [14].
Specimens were sectioned into discs, ground, polished, and micro-indented using a Micro-Combi Tester (CSM Instruments, Needham, MA) according to Nychka et al. [17].
El-Ghannam and C.Q.
El-Ghannam, P.
El-Ghannam, E.