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2+ in pulp on the separation of lead-zinc sulfide minerals
Published in Binoy K. Saikia, Advances in Applied Chemistry and Industrial Catalysis, 2022
Hongxiang Xu, Zengrui Pang, Quan Li, Mingzhen Hu, Jiushuai Deng, Bozeng Wu, Runzhi Huang, Shenzhou Li
Lead and zinc minerals play an important leading role in China's non-ferrous metal industry, but their flotation separation process is often affected by the presence of ions in the pulp. There may be some unavoidable ions introduced by mineral self-dissolution and fluid inclusion release in flotation pulp of sulfide ore[1]. These ions will inevitably have a significant effect on the separation of lead-zinc sulfide minerals. Pb2+ is an unavoidable ion introduced into the flotation pulp due to the self-dissolution of galena, which has a certain influence on the separation of lead-zinc sulfide ore. Therefore, the focus of this study is the separation and mechanism analysis of Pb2+ on lead-zinc sulfide ore.
Healing of fluid-filled microcracks
Published in J.-L. Auriault, C. Geindreau, P. Royer, J.-F. Bloch, C. Boutin, J. Lewandowska, Poromechanics II, 2020
F. Renard, D. Dysthe, J. Feder, B. Jamtveit
The tips of cracks have a high strain energy and therefore a larger chemical potential that the crack wall behind the crack tip. Therefore the crack tip is rapidly excavated by viscous forces under the influence of a high chemical potential of the gel relative to the fluid. There the chemical potential of the solid is lower relative to the fluid back along the crack wall, material is deposited to make a knob that becomes a “zipper”. The fluid inclusion bubble stabilizes as a tunnel is created at the crack tip.
Emission and transmission cathodoluminescence analysis of InGaAsP/InP LPE double heterostructures emitting at 1.3 and 1.6 microns
Published in A G Cullis, S M Davidson, G R Booker, Microscopy of Semiconducting Materials, 1983, 2020
M Cocito, C Papuzza, F Taiariol
In all cases 25 to 35 μm diameter hillocks were present on the surface. A small melt inclusion was always detected on the hillocks. CL analysis showed a close correspondence between hillocks and dislocation clusters; i.e. under each hillock a dislocation cluster was found. However not all clusters produce hillocks (Fig. 4a) and b)). Single dislocations seem to have no influence at all on surface morphology.
Cyclic and post-cyclic shear behaviours of natural fibre reinforced soil
Published in International Journal of Geotechnical Engineering, 2021
Innocent Kafodya, Felix Okonta
Soil reinforcement technique with randomly distributed fibres is used in various civil engineering applications like, retaining structures, slope stabilisation of embankments, subgrade stabilisation, etc. The capability of fibre inclusions to improve geotechnical properties of soil has been extensively reported in the literature (Diambra et al. 2010; Ahmad, Bateni, and Azmi 2010; Das and Singh 2017; Diambra et al. 2013; Ibraim and Consoli 2018; Hejazi et al. 2012; Kafodya and Okonta 2018a; Kumar Patel and Singh 2017; Moghal et al. 2018; Tang et al. 2010; Kafodya and Okonta 2018b). Various types of randomly distributed elements, such as polymeric mesh elements, metallic fibres, synthetic fibres, discontinuous multi-oriented polypropylene elements and natural fibres have proven to be effective reinforcing elements of soil.
Mechanical properties of glass fibre reinforced soil and its application as subgrade reinforcement
Published in Road Materials and Pavement Design, 2021
E. R. Sujatha, P. Atchaya, S. Darshan, S. Subhashini
The increase in the UCS of the reinforced soil as shown in Figure 6 can be attributed to the higher interfacial interaction of fibres with the soil matrix (Asadollahia & Dabiri, 2017; Ates, 2016; Patel & Singh, 2017). The UCS of the reinforced soil increases by approximately 60% and 48.5% when reinforced with AR glass fibres and E glass fibres respectively. Fibre inclusion possibly increases the frictional resistance at the soil–fibre interface in the soil matrix thus improving the resistance of the soil particles to higher loads (Patel & Singh, 2014). With further increase in fibre content to 1%, the strength of the reinforced soil decreases due to fibre clumping / balling that leads to improper mixing and thereby higher percentage of voids (Kumar et al., 2006, Patel & Singh, 2014; Sujatha et al., 2018a). Also, with the increase in fibre content, the soil necessary for holding the fibres within the soil matrix is not sufficient leading to reduced frictional resistance at the soil – fibre interface and thereby results in reduced strength (Patel & Singh, 2017). Soil was observed to fail with multiple shear planes and bulging with the increase in fibre content particularly, the ARGFRS and in case of E-GFRS brushing at the bottom is observed (Figure 7).
Shear behavior of geotextile-reinforced Chlef sand in the Mediterranean region: Laboratory investigation
Published in Marine Georesources & Geotechnology, 2019
Sidali Denine, Noureddine Della, Sadok Feia, Rawaz Dlawar Muhammed, Jean Canou, Jean-Claude Dupla
Soil reinforcement, a recent method has significantly improved the mechanical behavior of composite materials. Numerous research works that have been reported in the literature indicate the greater effect of reinforcement inclusion to enhance both the shear strength of the soil and other physical properties of stability. As reinforcing material, geosynthetics, in several forms increase the shear strength of reinforced soil in comparison with unreinforced soil: among studies investigating this effect using triaxial compression and direct shear tests are the studies of Gray and Ohashi (1983), Al Refeai (1991), Ranjan, Vasan, and Charan (1994), Yetimoglu and Salbas (2003), Consoli et al. (2009), Ibraim et al. (2010), Liu et al.(2011), Hamidi and Hooresfand (2013), Nguyen et al. (2013) and Denine et al. (2016).