Flotation using sodium dodecyl sulphate and sodium lauroyl isethionate for rapid dewatering of Mg(OH)₂ radwaste suspensions

Abstract

Mg(OH)2 suspensions were floated utilising sodium dodecyl sulphate (SDS) sodium lauroyl isethionate (SLI) collectors, for rapid dewatering of radwaste suspensions.

Amphiphilic Block Copolymers as Dual Flocculation-Flotation Agents for Rapid Solid-Liquid Separation of Radioactive Wastes

“…Mg(OH) 2 was also found to be self-buffering when suspended in water, due to its semi-soluble nature, maintaining a suspension pH of ~ 10.10 with an initial solids concentration of 2.5 vol%. It should also be noted that in previous work, Mg(OH) 2 was found to aggregate to a degree overtime [57].…”

“…Fine magnesium hydroxide, Mg(OH) 2 , powder (Versamag, Martin Marietta, US) was used for flocculation and flotation experiments, as in previous work by the current authors [26,57]. Mg(OH) 2 is made up of aggregates of pseudo-hexagonal platelets similar to those reported by Johnson et al [71] and Maher et al [72].…”

“…They can also adsorb onto solid substrates either as individual copolymer chains, forming a brushlike layer; or by micellar adsorption depending on dosed concentration rather than stimuli triggers [51][52][53][54][55][56]. This mechanism of hydrophobisation by adsorption in the monolayer concentration regime is analogous to traditional surfactants when used as collectors [57]. A further advantage is that higher molecular weight hydrophobic blocks have little effect on surface tension, with critical micelle concentrations (CMCs) decreasing with increasing hydrophobic blocks, allowing control over water loss [58][59][60][61][62].…”

“…Additionally, Mg(OH) 2 is a common nuclear waste analogue, as it is a corrosion product from long term underwater storage of Magnox alloy used in UK nuclear fuel cladding [70]. Mg(OH) 2 has also used in previous investigations, where its sedimentation with traditional polyelectrolytes and flotation with surfactant collectors have been determined [26,57]. Likewise, here, the block copolymers were investigated for their performance as both sedimentation and flotation aids in a batch flotation cell, using methyl isobutyl carbinol frothing agent.…”

Amide group enhanced self‐assembly and adsorption of thioether‐containing hydroxamic acid on cassiterite surface

“…The adsorption capacity (mg/g) of BTAHA or BTHA on cassiterite surfaces was calculated by the following formula (). The adsorption of the surfactant was analyzed by Freundlich adsorption curve using the equation shown in formula () 30 …”