Topic
Hemimorphite
About: Hemimorphite is a research topic. Over the lifetime, 167 publications have been published within this topic receiving 2750 citations. The topic is also known as: calamine.
Papers published on a yearly basis
Papers
TL;DR: In this article, a mathematical model was developed for leaching of zinc ores containing silicates such as hemimorphite which produce a gel during leaching with sulfuric acid.
206 citations
TL;DR: In this article, a leaching study was carried out to assess the effect of several parameters on the kinetics of zinc dissolution, including sulfuric acid concentration, reaction time, temperature and slurry density, and the optimum pH, holding time and temperature required to maximize the filtration rate were determined.
189 citations
TL;DR: In this paper, the impact of leaching recovery of Zn and its concomitant metals was checked through experiments, and the kinetic study indicates that the calculated activation energy is 45.7 kJ/mol, which illuminates that alkaline leaching the refractory hemimorphite [Zn4(Si2O7)(OH)·H2O] zinc oxide ores is controlled by the chemical process of the reaction of leach liquor and ores in the whole leach process.
118 citations
TL;DR: In this article, the leaching of various oxidized zinc ores in different solvents has been studied in laboratory tests by agitation leaching and in some cases by percolation leaching.
95 citations
TL;DR: X-ray absorption fine structure (XAFS) spectroscopy has been used to further elucidate the binding mechanisms of Zn(II) to calcium silicate hydrate (C-S-H), the quantitatively most important cement mineral.
Abstract: In this study, X-ray absorption fine structure (XAFS) spectroscopy has been used to further elucidate the binding mechanisms of Zn(II) to calcium silicate hydrate (C-S-H), the quantitatively most important cement mineral. Such knowledge is essential for the assessment of the longterm behavior of cement-stabilized waste materials. XAFS spectra of the Zn(II) equilibrated with C-S-H(I) for up to 28 days are best modeled by tetrahedral coordination of Zn(II) by four O atoms in the first atomic shell. Beyond the first coordination shell, data analysis of more highly concentrated samples suggests the presence of two distinct Zn distances and possibly the presence of an Si shell. On the basis of the comparison with a set of reference compounds, this coordination environment can be reasonably related to the structure of hemimorphite, a naturally occurring zinc silicate, and/or the presence of gamma-Zn(OH)2. At the lowest Zn uptake, the above fitting approach failed and data could be described best with a Zn-Si and a Zn-Ca shell. Previous work has been able to show that Zn(II) diffuses into the C-S-H(I) particles and does not form discrete precipitates, so the findings appear to confirm the incorporation of Zn(II) in the interlayer of C-S-H(I).
94 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 5 |
| 2020 | 9 |
| 2019 | 9 |
| 2018 | 10 |
| 2017 | 8 |
| 2016 | 9 |