Acid deposition during the 20th century caused widespread depletion of available soil calcium (Ca) throughout much of the industrialized world. To better understand how forest ecosystems respond to changes in a component of acidification stress, an 11.8-ha watershed was amended with wollastonite, a calcium silicate mineral, to restore available soil Ca to preindustrial levels through natural we...

The crystallisation behaviour of vitrified industrial waste (fly ash from domiciliary solid waste incineration) was examined by differential thermal analysis, X-ray diffractometry and scanning electron microscopy. It was demonstrated that powder processing route was required to transform the vitrified industrial waste into glass-ceramics products. Time-Temperature-Transformation (TTT) diagrams ...

In the paper are reported results of first stage tests performed to verify possibility beneficiation a wollastonite mineral (calcium metasilicate, CaSiO3). The studied ore comes from mineralized body located in southern part Sardinia (Italy), area named "Gutturu Is Abis". is composed associated with limestone, garnets and silica. approach problem has consisted grinding followed by flotation sep...

Ahshact-The heat capacity of synthetic andradite garnet (Ca~Fe&Oir) was measured between 9.6 and 365.5 K by cryogenic adiabatic calorimetry and from 340 to 990 K by differential scanning calorimetry. At 298.15 KC&,, and Sz arc 351.9 + 0.7 and 316.4 rf: 2.0 J/(mol-K), respectively. Andradite has a X-peak in Ci, with a maximum at 11.7 t 0.2 K which is presumably associated with the antiferromagne...

Among bioactive ceramics, the apatite/wollastonite (A/W) glass ceramic, containing apatite and wollastonite crystals in the glassy matrix, has been largely studied because of good bioactivity and used in some fields of medicine, especially in orthopedics and dentistry. However, medical applications of bioceramic are limited to non-load bearing applications because of their poor mechanical prope...