A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Pozzolanic, amorphous silica produced from the mineral olivine
Amorphous silica with high whiteness and surface can be produced by simply decomposing the basic mineral olivine, (Mg,Fe)SiO2, in any acid. The result is a solution of magnesium and ferrous salts and silica slurry that can be purified by washing and filtering or decanting. Such silica has been produced by treating an olivine mineral residue, a by-product of nickel ore recovery, by hydrochloric acid. The free flowing silica residue, after drying at 105'C, is proven to have pozzolanic activity, (consumption of calcium hydroxide) by thermal analysis (DTA/TG) and by strength measurements of mortars where cement is replaced with silica. The reactivity and strength gain was comparable to conventional silica fume obtained from ferrosilicon plants. The abundant mineral olivine can be a valuable source of amorphous silica for concrete technology, while the waste product lye could be used as a CO2 free magnesium chloride source for magnesium metal production, after purification. The process could also use waste acids, from paper pulp industry.
Pozzolanic, amorphous silica produced from the mineral olivine
Amorphous silica with high whiteness and surface can be produced by simply decomposing the basic mineral olivine, (Mg,Fe)SiO2, in any acid. The result is a solution of magnesium and ferrous salts and silica slurry that can be purified by washing and filtering or decanting. Such silica has been produced by treating an olivine mineral residue, a by-product of nickel ore recovery, by hydrochloric acid. The free flowing silica residue, after drying at 105'C, is proven to have pozzolanic activity, (consumption of calcium hydroxide) by thermal analysis (DTA/TG) and by strength measurements of mortars where cement is replaced with silica. The reactivity and strength gain was comparable to conventional silica fume obtained from ferrosilicon plants. The abundant mineral olivine can be a valuable source of amorphous silica for concrete technology, while the waste product lye could be used as a CO2 free magnesium chloride source for magnesium metal production, after purification. The process could also use waste acids, from paper pulp industry.
Pozzolanic, amorphous silica produced from the mineral olivine
Puzzolanes amorphes Siliciumdioxid aus mineralischem Olivin
Justnes, H. (author) / Ostnor, T. (author)
2001
13 Seiten, 5 Bilder, 4 Tabellen, 8 Quellen
Conference paper
English
Pozzolanic, Amorphous Silica Produced from the Mineral Olivine
| British Library Conference Proceedings | 2001
Pozzolanic characteristics of silica recovered from olivine
| Elsevier | 2022
Pozzolanic characteristics of silica recovered from olivine
| Elsevier | 2022
Pozzolanic activity of amorphous silica
| Tema Archive | 1992
Pozzolanic activity of silica dust
| Elsevier | 1979