Salinity effects on sedimentation behavior of kaolin, bentonite, and soda ash mine tailings

Gorakhki, Mohammad H.; Bareither, Christopher A.

doi:10.1016/j.clay.2015.07.018

Cited by 47 publications

(11 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in basic pH ranges, the particles settle in both dispersed form (in 0.001 M NaCl electrolyte concentration) and flocculated form (in 0.1 and 1 M NaCl electrolyte concentration). Gorakhki and Bareither [15] evaluated the effect of salinity and cation valence on the sedimentation behaviour of kaolinite, bentonite, and soda ash mine tailings without addition of polymers and suggested that an increase in salinity led to higher sedimentation rates and final solids contents for bentonite. In contrast, a salt concentration of 100 mM was identified as a critical concentration whereupon the settling rate of kaolinite decreases regardless of salt type.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Investigating the settling behaviour of saline tailing suspensions using kaolinite, bentonite, and illite clay minerals

Liu

Edraki

Berry³

2018

Powder Technology

View full text Add to dashboard Cite

This study aimed to understand the dewatering behaviour of three types of clay minerals (i.e. kaolinite, bentonite, and illite) in saline water, and in particular the effect of factors including clay mineralogy, clay suspended solid concentration, water salinity, and polymer flocculant dosage on dewatering behaviour. It was demonstrated that the addition of polymer flocculants helped all three clay types to settle due to the polymer bridging effect. In saline water, this bridging effect worked best above a certain threshold level for illite but tailed off for the other two clay types. As well, high-salinity water was observed to assist bentonite and illite to settle faster but to hinder the settling rate of kaolinite. In addition to inter-particle forces, the clay aggregate structures formed through the addition of the flocculants were identified to play an important role in determining the dewatering behaviour of clay minerals in saline water. Cryo-scanning electron microscopy (SEM) identified that, depending on the clay type, the floc structures in saline water were either dense (water-excluding) or loose (watertrapping). Dense flocs were observed to settle more quickly than loose flocs. This study has practical applications in providing guidance for the processing of complex tailings containing clay minerals in saline water. Highlights Several factors affect the dewatering behaviour of clay minerals in saline water.  High-salinity water assists bentonite and illite to settle but hinders kaolinite.  Polymer works best above a threshold dose for illite but tails off for other clays.  Clay aggregate structures can either be dense or loose and vary by clay type.  Both inter-particle forces and aggregate structures influence the dewatering rate.

show abstract

Section: Accepted Manuscriptmentioning

confidence: 99%

Investigating the settling behaviour of saline tailing suspensions using kaolinite, bentonite, and illite clay minerals

Liu

Edraki

Berry³

2018

Powder Technology

View full text Add to dashboard Cite

show abstract

“…Firstly, it is well-known that salinity can decrease the repulsive forces between the clay particles and therefore enhance flocculation (Whitehouse et al, 1960;Mietta et al, 2009;Pourmohammadbagher & Shaw, 2016). However, different clay types may behave differently to salt concentration (Gorakhki & Bareither, 2015). Secondly, several studies have shown that clay flocculation decreased with increasing pH (e.g.…”

Section: Do the Deposits From Lake Hazar Validate Flume Experiments Fmentioning

confidence: 99%

Flow dynamics at the origin of thin clayey sand lacustrine turbidites: Examples from Lake Hazar, Turkey

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In freshwater, the swelling effect of montmorillonite is more significant than in saline medium. This is because the cations being in saline water helps to neutralise the negative charges of the interlayer layers of the clay, reducing its electrostatic repulsion and therefore its separation distance [34][35][36]. This prevents the entrance of water molecules into the clay, notably impacting its swelling [37].…”

Section: Rheological Behaviour In Saline Environmentsmentioning

confidence: 99%

Rheological Perspectives of Clay-Based Tailings in the Mining Industry

Jeldres¹,

Jeldres²

2021

Clay Science and Technology

View full text Add to dashboard Cite

The mining industry faces a significant problem in regions with water scarcity and has had to put in place new strategies to preserve its environmental and economic sustainability. An attractive option in recent years has been the direct use of seawater, avoiding the construction of reverse osmosis plants to desalinate. But, some operational complexities are the subject of discussion and research for engineers; for example, the difficulties by the high presence of complex gangues like clays and the location of the plants, far from the coast and at high altitude. The latter requires high investments in pumping, the only option in some cases. In this scenario, it is imperative to improve the efficiency of water use and advance to effective closures of water circuits. A critical stage is the thickening that allows water to be recovered from the tailings, reusing it in upstream operations. However, the performance of the tailings management is usually limited by the rheological properties of the thickened slurries, which impact on the discharge from the underflow of the thickeners, pumping energy costs, disposal on the tailings storage facilities (TSFs). This text describes the consequences caused by a saline medium on the rheological properties of clay-based tailings, analysing scenarios that allow tackling this operation.

show abstract

Salinity effects on sedimentation behavior of kaolin, bentonite, and soda ash mine tailings

Cited by 47 publications

References 21 publications

Investigating the settling behaviour of saline tailing suspensions using kaolinite, bentonite, and illite clay minerals

Investigating the settling behaviour of saline tailing suspensions using kaolinite, bentonite, and illite clay minerals

Flow dynamics at the origin of thin clayey sand lacustrine turbidites: Examples from Lake Hazar, Turkey

Rheological Perspectives of Clay-Based Tailings in the Mining Industry

Contact Info

Product

Resources

About