Characterization of portuguese diatomites in order to assess potential applications

Title:

Characterization of portuguese diatomites in order to assess potential applications

Creator:

Costa, Cristiana, Velosa, Ana, Cerqueira, Angela, Caetano, Paulo, and Rocha, Fernando

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:ef372585-e8c3-4b9b-bcd8-4119b86d904a
uuid:ef372585-e8c3-4b9b-bcd8-4119b86d904a
issn:1214-9705
doi:10.13168/AGG.2018.0003

Subject:

geodynamika, geomechanika, geofyzika, geologie, geodynamics, geomechanics, geophysics, geology, diatomit, charakterizace, užití, diatomite, characterization, beneficiation, applications, 7, and 551

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

Diatomite is a siliceous sedimentary rock, and it can be used in many industrial applications due to its high porosity, low density porous and permeable structure, chemical resistance, high purity, high specific surface area, absorptive capacity and to its absorbent properties. The best known Portuguese occurrences of diatomite are located in the regions of Óbidos and Rio Maior. The purpose of this research is to characterize the Rio Maior and Amieira diatomite and beneficiate this rock to be used in some potential applications locally or not. The studied diatomites present a fine texture; chemically the samples have a high SiO2 content, the principal minerlas are quartz and amorphous opal. The studied diatomites benefited with temperature and addition of NaCl (acting as accelerator of the crystallization process), with 5 % of NaCl being reduced the transformation temperature of the amorphous opal in opal C / CT at about 200 ºC. The diatomites from Rio Maior and Amieira in natural state has an enormous potential as absorbent, of heavy metals (e.g. in soil contamination) or dyes (textile industry). These diatomites after beneficiation can be used in construction materials (as additive), being more reactive and crystalline than in the natural state, diatomites can be promoters of mechanical resistance in mortars and geopolymers. and Costa Cristiana, Velosa Ana, Cerqueira Angela, Caetano Paulo, Rocha Fernando.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Source:

Acta geodynamica et geomaterialia : | 2018 Volume:15 | Number:1 (189)

Harvested from:

CDK

Metadata only:

false