Transactions of Nonferrous Metals Society of China (中国有色金属学报)•2026•DOI: 10.1016/S1003-6326(26)67069-0
The redox smelting of zinc leaching residue (ZLR) was investigated to determine the migration behavior and toxicity characteristics of zinc under varying anthracite addition, temperature, and holding time. The ZLR, containing 10–20 wt.% Zn, 0.5–5 wt.% Pb, and 0.1–0.5 wt.% Cd, generates TCLP leachate concentrations of Zn up to 4589.0 mg/L, far exceeding regulatory limits. Experimental results reveal that CaSO4 in the residue promotes the transformation of ZnFe2O4 into a ZnS–FeS eutectic, which hinders zinc recovery and elevates environmental risk due to its lower thermodynamic stability relative to (Fe,Zn)2SiO4, ZnFe2O4, and (ZnO)slag. At temperatures above 1573 K, the ZnS–FeS eutectic is oxidized by O2/(O)slag to ZnO(s), subsequently dissolved into the slag as chemically dissolved Zn, and finally reduced to Zn(g) by CO. Pre-desulfurization or increased oxygen potential enhances zinc volatilization. Under optimized conditions, the zinc recovery ratio reached 99.13%, and the residual zinc content in the slag decreased to 0.22 wt.%, substantially below the industrial range of 1.0–3.0 wt.%. A novel strategy integrating desulfurization pretreatment with redox smelting is proposed, which lowers the required smelting temperature and improves zinc recovery efficiency, offering a more economical and environmentally sustainable solution for ZLR treatment.
Nano-Micro Letters•2025•DOI: 10.1007/s40820-025-01681-9
To adapt to the trend of increasing miniaturization and high integration of microelectronic equipments, there is a high demand for multifunctional thermally conductive (TC) polymeric films combining excellent flame retardancy and low dielectric constant (ε). To date, there have been few successes that achieve such a performance portfolio in polymer films due to their different and even mutually exclusive governing mechanisms. Herein, we propose a trinity strategy for creating a rationally engineered heterostructure nanoadditive (FG@CuP@ZTC) by in situ self-assembly immobilization of copper-phenyl phosphonate (CuP) and zinc-3, 5-diamino-1,2,4-triazole complex (ZTC) onto the fluorinated graphene (FG) surface. Benefiting from the synergistic effects of FG, CuP, and ZTC and the bionic lay-by-lay (LBL) strategy, the as-fabricated waterborne polyurethane (WPU) nanocomposite film with 30 wt% FG@CuP@ZTC exhibits a 55.6% improvement in limiting oxygen index (LOI), 66.0% and 40.5% reductions in peak heat release rate and total heat release, respectively, and 93.3% increase in tensile strength relative to pure WPU film due to the synergistic effects between FG, CuP, and ZTC. Moreover, the WPU nanocomposite film presents a high thermal conductivity (λ) of 12.7 W m−1 K−1 and a low ε of 2.92 at 106 Hz. This work provides a commercially viable rational design strategy to develop high-performance multifunctional polymer nanocomposite films, which hold great potential as advanced polymeric thermal dissipators for high-power-density microelectronics.
Int. Journal of Mining Science and Technology (采矿与安全工程)•2025•DOI: 10.1016/j.ijmst.2025.11.002
The stability of rock slopes is frequently controlled by the initiation and propagation of inherent dominant cracks. This study systematically investigated these processes in valley slopes by combining fracture-mechanics analysis with transparent soil model tests. An analytical expression for the stress field at the dominant crack tip was derived from the slope stress distribution by superposing the corresponding stress intensity factors (SIFs). The theoretical predictions were then validated against observations from transparent soil model tests. The influences of slope angle (β), crack inclination angle (α), crack position parameter (b), and crack length parameter (l) on crack initiation and propagation were quantified. The results indicated that: (1) cracks at the slope crest tended to propagate in shear mode, and the shear crack initiation angle (θs) was approximately 8°. Cracks at the slope toe might propagate in either tensile or shear mode. (2) θs at the slope crest increased with β, b, and l, and decreased with α. The maximum change in θs induced by the considered parameters was approximately 30°. (3) The tensile crack initiation angle (θt) at the slope toe decreased with β, α, and l, while the influence of b was comparatively minor. The maximum change in θt caused by individual parameters ranged approximately from 25° to 60°. Predicted crack propagation modes and directions showed good agreement with experimental results. These findings provide theoretical guidance for stability assessments of valley slopes controlled by dominant crack propagation.
Journal of Central South University•2025•DOI: 10.1007/s11771-025-6121-1
Additive manufacturing (AM) of SiCP/Al composites has shown significant potential for expanding the application of aluminum matrix composites (AMCs) due to their outstanding mechanical properties and wear performance. However, conventional mechanically mixed powders for AM are limited due to the possible powder agglomeration and poor fluidity. In this study, the spherical SiCP/AlSi10Mg composite powders prepared by spray granulation were employed to fabricate SiCP-reinforced AlSi10Mg composites using laser powder bed fusion (LPBF). The impacts of laser power on microstructure evolution and wear properties of composites were systematically investigated. The results indicated that an in-situ reaction between the aluminum matrix and SiCP during the LPBF process, resulted in the formation of particle-like and strip-like strengthening phase Al4SiC4. By adjusting the laser power (from 270 W to 350 W) to change the ratio of SiCP to Al4SiC4, micro-defects could be effectively limited, and wear performance could be improved. Consequently, with an optimized ratio of SiCP to Al4SiC4, the composite exhibited a mixed strengthening mechanism caused by the SiCP and Al4SiC4 reinforcing phases. At a laser power of 310 W, the sample exhibited minimal porosity with a microhardness value reaching 265.38HV, while maintaining relatively low average friction coefficient and wear rate. In addition, compared with other studies, the hardness obtained was superior to that of the AlSi10Mg and other reported SiCP/AlSi10Mg composites with similar volume fractions using the mixed powders.