The results of studies the physico-chemical regularities acid decomposition magnesium-containing raw materials are presented and optimal technological mode individual stages obtaining magnesium sulfate is determined. It has been established that process based on dolomite includes following stages: with sulfuric acid; filtration resulting suspension separation calcium insoluble residue subsequen...

Sulfate attack is a series of physico-chemical reactions between hardened cement paste and sulfate ions. Sulfate ion penetration into the hydrated cement results in the formation of voluminous and deleterious phases such as gypsum and ettringite which are believed to cause deterioration and expansion of concrete. Concrete deterioration due to sulfate attack depends on many parameters, however, ...

the serpentinization of the harzburgitic mantle section of the bou azzer neoproterozoic ophiolite is studied by field mapping, structural observations, optical micrography, sem and x-ray diffractometry, and relationships with co, ni, cr and sulphides minerals are discussed. serpentinization occurred in two major steps with, i) intra-oceanic pseudomorphic serpentinization materialized by the iso...

UNGG cladding nuclear wastes constitute a huge volume of Mg-based materials that raises economic and safety concerns, particularly due to their radioactivity coupled the potential generation H2 gas under deep underground disposal. Their significant decontamination would result in more secure less expensive storage, with better containment separated long-lived radioisotopes could enter classical...

To demonstrate the superiority of dam concrete, a systematic study was conducted to examine durability low-heat cementitious composite (LHCC) that is composed Portland cement (PC), fly ash (FA), and MgO expansive additive (MEA) with PC as reference group. Through GEMS software, XRD, SEM, EDS, difference mechanism in between two materials revealed from perspectives phase evolution microstructura...

A growing interest in designing high-alumina MgO-bonded refractory castables has been identified recent years due to the magnesia ability react: (i) with water at initial processing stages of these materials (inducing precipitation brucite phase) or (ii) alumina, giving rise situ MgAl2O4 generation high temperatures. Nevertheless, despite great potential caustic be used as a binder such systems...

Oxide surface coatings are ubiquitous in the environment, but their effect on the intrinsic metal uptake mechanism by the underlying mineral surface is poorly understood. In this study, the zinc (Zn) sorption complexes formed at the kaolinite, goethite, and goethite-coated kaolinite surfaces, were systematically studied as a function of pH, aging time, surface loading, and the extent of goethit...

General lattice vibrational properties of minerals, particularly those properties which strongly influence the thermodynamic behavior, are discussed in this paper (the second of a series relating thermodynamic and lattice vibrational properties of minerals). Infrared (IR), Raman (R), and inelastic neutron scattering (INS) data are summarized, if known, for the following minerals: halite (INS), ...