NINPNorfolk Island National Park (Australia)
NINPNot in Public (Lawrenceville, NJ band)
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When the concentration of MgO is increased from 10 to 50 g/L, the benefit of NiNP addition with mechanical mixing is much reduced in the first 15 minutes (Figure 4) and essentially disappears for longer reaction times.
To confirm the aforementioned effects of NiNP, further mineral carbonation experiments were performed using AOD and CC steelmaking slags, as these materials are considered some of the most readily available and reactive (due to powdery morphology and high calcium silicate content) for industrial mineral carbonation implementation [8].
Results obtained for CC slag (Figure 5) present similar trend to the ones from CaO and MgO carbonation experiments, namely, a greater conversion in the first 15 minutes when NiNP addition was used; however, after 30 minutes this effect is no longer present.
Influence of NiNP on Mineralogical Composition of Carbonated Materials.
Table 3 presents the mineralogical composition of the fifteen-minute and one-hour carbonated calcium and magnesium oxides, with and without NiNP addition, and prepared with mechanical mixing.
It can be thus concluded that NiNP addition has no great effect on mineralogical distribution of the carbonate phases in carbonated materials.
Influence of NiNP on Particle Size Distribution of Carbonated Materials.
As in the mineralogical analysis, no significant difference is found between samples prepared in the presence of NiNP and those prepared in pure water.
Influence of NiNP on Particle Morphology of Carbonated Materials.
In all cases, the carbonated materials presented the same crystal morphology irrespective of NiNP addition, which confirms the observations previously presented from mineralogical and laser diffraction analyses.
The additive used in the present study, pure nickel nanoparticles (NiNP), has another purpose, namely, increasing dissolved C[O.sub.2] dissolution and dissociation in the aqueous solution, as divulged by Bhaduri and Siller [14], conceptualizers of this approach, and thereby potentially accelerating the C[O.sub.2] uptake rate by the carbonating material, herein tested.
The confirmation of dissolving a higher quantity of C[O.sub.2] in the NiNP-containing solution was done by studying the evolution of solution's pH value; more acidic values obtained in the presence of NiNP suggest an increased presence of dissociated carbonic acid.