Difference of zinc volatility in diverse carrier minerals: The critical limit of blast furnace dust recycle

The importance of an initial aggregation step for the destabilization of an anatase colloidal suspension

Due to the shortage of freshwater, seawater has been widely considered for mineral flotation. However, the presence of Mg2+ in seawater plays an apparently negative role. In this work, two dispersants (i.e., sodium silicate (SS) and sodium hexametaphosphate (SH)) were applied to reduce the detrimental effects of Mg2+ on the flotation of molybdenite (MoS2). Various measurements including contact angle, zeta potential, FTIR and XPS were carried out to understand the impacts of these two dispersants on MoS2 flotation. Results indicate that both dispersants prevented the adsorption of colloidal Mg(OH)2 onto MoS2 surface under alkaline conditions, thereby improving MoS2 floatability. In addition, both dispersants are physically adsorbed on MoS2 surface, but chemically adsorbed on Mg(OH)2 surface. In addition, the extended Derjaguin–Landau–Verwey–Overbeek (DLVO) calculation suggests that both SS and SH reverse the total interaction energies between MoS2 and colloidal Mg(OH)2 from negative (attraction force) to positive (repulsive force), with the impact of SH being more significant.

/pdf/new-insights-into-the-beneficial-roles-of-dispersants-in-kavilsl29a.pdf

New insights into the beneficial roles of dispersants in reducing negative influence of Mg2+ on molybdenite flotation

/pdf/study-of-recycling-blast-furnace-dust-by-magnetization-1f4la7d3.pdf

Study of recycling blast furnace dust by magnetization roasting with straw charcoal as reductant

The contents of Fe and SiO2 in ferric bauxite are much higher than that in regular bauxite, and the leaching yield of Al2O3 from ferric bauxite cannot reach the general level of ordinary ores, even under optimal conditions. This paper introduces a pretreatment method to enhance sintering before leaching. First, mixing followed by grinding was found to be more efficient than grinding followed by mixing as a pretreatment method by forming a directional coating structure of CaCO3 on the SiO2 surface. Second, leaching yields increased grinding fineness because CaCO3 grain uniformity could be improved with the latter method. Finally, the leaching yields were increased by pulp consistency under certain conditions, as evidenced by improvements in CaCO3 uniformity, bulk density, and Al2O3 grain size, which parameters were beneficial to enhance leaching. The leaching yield of Al2O3 was increased from 75.2% to 87.15% by using the proposed mixing–grinding method with the leaching agent of water.

/pdf/promote-alumina-leaching-through-re-pelleting-effects-of-50622u99rn.pdf

Promote Alumina Leaching through Re-Pelleting: Effects of Directional Coating of Calcite on Silicate Grains

The sodium leaching ratio (ηN) of ferric bauxite direct reduction process is much lower than that of ordinary bauxite; thus, the former consumes more sodium than the latter. ηN can be promoted by increasing the dosage of sodium or restricted by increasing the heating temperature and time. However, the restriction effect of heating temperature is 16.67 times larger than that of heating time, and the restriction effect decreases 47.03 times faster when heating temperature increases than that process of heating time. These imply that ηN improves with the increasing sodium carbonate dosage and the decreasing heating temperature.

https://www.mdpi.com/2075-163X/7/1/10/pdf

Improvement of Sodium Leaching Ratio of Ferric Bauxite Sinter after Direct Reduction

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Improvement of Sodium Leaching Ratio of Ferric Bauxite Sinter after Direct Reduction