Abstract
Background and Objective:For the sake of optimal beneficiation of the products formed in the chemical sequestration of CO2on silicates, extraction of the chromite has been carried out prior to carbonation, by flotation in a lab-scale column.Method:Industrial-grade olivine and serpentine were tested. Flow conditionse.g. gas flow rate, stirring, particle diameter of silicates, and physicochemical considerations (composition if the electrolyte solution) have been examined to optimize the separation efficiency in terms of chromite recovery or enrichment factor.Result:The high performance observed with chromite-enriched olivine allows a multistage flotation process from low-chromite minerals blends to be designed.Conclusion:The lower performance with native olivine was attributed to the existence of mixed chromite-silicate particles.
Highlights
The increasing concentration of CO2 in the atmosphere is attributed to the rising consumption of fossil fuels for energy generation or use around the world
The lower performance with native olivine was attributed to the existence of mixed chromite-silicate particles
The flotation method has been developed after addition of 3.3 wt% M4 chromite to GL 30 olivine particles to magnify the possible separation of the two minerals by flotation
Summary
The increasing concentration of CO2 in the atmosphere is attributed to the rising consumption of fossil fuels for energy generation or use around the world. The Open Chemical Engineering Journal, 2017, Volume 11 per ton CO2 depending on the process considered [1 - 3], far larger than that of the above CO2 emission For this purpose, within the Ademe-funded Valorco project in France with ArcelorMittal, it has been decided to investigate thoroughly the separation and purification of the various mineral fractions. For positively charged chromite particles, sodium oleate, dodecylsufate or i-butyl xanthate: the two first salts have been used at pH 4 [6] for removal of chromite particles from a liquid waste, whereas butyl xanthate has been suggested in the presence of CuOH+ ions at pH 8.9 [14] The latter technique has been developed in continuous flotation columns or in other pilot or industrial devices for processing of UG2 ore in South Africa [5, 16 - 18] to remove the major chromite-containing part of the ore, in view to recovering platinum group elements. As a matter of fact, an industrial flotation process can consist in a multi-stage process in which the collected particles on top of one stage is injected into the one in view to recovering highly concentrated chromite
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