Utilization of Chrysotile-Type Tailings for Synthesis of High-Grade Silica by Controlled Precipitation

This study demonstrates an efficient synthesis of highly reactive silica using hydrometallurgical processing of serpentinite tailings. Proposed process uses two-stage (acid and alkaline) leaching of serpentinite tailings and precipitation of silica from the sodium metasilicate solution using hydroch...

Full description

Saved in:
Bibliographic Details
Published in:Mineral processing and extractive metallurgy review 2016-09, Vol.37 (5), p.287-294
Main Authors: Fedoročková, A., Raschman, P., Sučik, G., Ivánová, D., Kavuličová, J.
Format: Article
Language:English
Subjects:
Alkaline leaching
Chemical precipitation
Extractive metallurgy
Hydrometallurgy
Impurities
Leaching
Metallurgy
oxides
precipitation
Precipitation (chemistry)
refining
Silica
silicates
Silicon dioxide
Sodium
Synthesis
Tailings
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This study demonstrates an efficient synthesis of highly reactive silica using hydrometallurgical processing of serpentinite tailings. Proposed process uses two-stage (acid and alkaline) leaching of serpentinite tailings and precipitation of silica from the sodium metasilicate solution using hydrochloric acid. The alkaline leaching and the effect of impurities on the precipitation of amorphous silica under the conditions of maximum sol stability were examined in detail. The proposed route is technologically advantageous because the product did not contain residues of the original raw serpentinite and was characterized by high purity (99.4 wt. % SiO 2 ), large specific area (541 m 2 g -1 ), and consistent quality. Moreover, less sensitivity to the presence of impurities and longer gelation times, offering a longer time period for manipulating the product in the final stages of the process, were achieved. The total yield of silicon in the overall process was 90-91%.
ISSN:0882-7508
1547-7401
DOI:10.1080/08827508.2016.1195738