The Effect of Surface Charge on the Separation of Pyrite from Serpentine by Flotation

Long, Tao; Xiao, Huang; Xiao, Weiqiang

doi:10.3390/min9100629

Cited by 16 publications

(5 citation statements)

References 31 publications

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“…This is due to its precipitation and surface charge which may contribute to the adsorption of polar crude components (asphaltene) onto the rock surface, thus resulting in wettability alteration. Pyrite surface charge has a significant effect from a solid–fluid interaction point of view and is highly dependent on the medium pH, which also is controlled by the amount and type of salts present as well as the environmental (anoxic or oxygen-rich) conditions. Weerasooriya and Tobschall report the effect of pH on the surface charge of pyrite in pyrite–water interactions and concluded that the surface charge is controlled by the presence of H + , OH – , and Fe 2+ .…”

Section: Introductionmentioning

confidence: 99%

Impact of Iron Minerals in Promoting Wettability Alterations in Reservoir Formations

et al. 2021

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Asphaltene adsorption and deposition onto rock surfaces are predominantly the cause of wettability and permeability alterations which result in well productivity losses. These alterations can be induced by rock−fluid interactions which are affected by well operations such as acidizing, stimulation, gas injections, and so forth. Iron minerals are found abundantly in sandstone reservoir formations and pose a problem by precipitation and adsorption of polar crude components. This is due to rock−fluid interactions, which are dependent on reservoir pH; thus, this research work studied the surface charge development of pyrite, magnetite, and hematite. To ascertain conditions that will result in iron mineral precipitation and adsorption of asphaltene on iron mineral surfaces, zeta potential measurement was carried out. This is to determine the charge and colloidal stability of the iron mineral samples across wide pH values. Experimental results show that the charge development of iron minerals is controlled by mineral dissolution, the formation of complexes, adsorption of ions on the mineral surface, and the collapse of the double layer. The findings provide insights into the implications of iron mineral contacting crude oil in reservoir formations and how they contribute to wettability alterations due to different well operations.

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Section: Introductionmentioning

confidence: 99%

Impact of Iron Minerals in Promoting Wettability Alterations in Reservoir Formations

et al. 2021

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“…Coal slurry is a complex mixture with multiple components and phases, in which the colloidal particles are coagulated and aggregated through the action of charge neutralization, patch aggregation, bridge connection, and sweep flocculation in series or synchronously for negatively charged particles resulting from the existence of preferential dissociation (or dissolution), adsorption and ionization, lattice substitution, and other phenomena [39,40]. Although it is difficult to separate these mechanisms throughout the aggregation process, analyzing zeta potential variation and particle removal as a function of coagulant dosage might provide some insight [41]. As shown in Figure 3, similar charge properties were observed upon injection of Mg 2+ , Ca 2+ , Al 3+ , and Fe 3+ .…”

Section: Zeta Potentialmentioning

confidence: 99%

Characteristics of Coal Slurry Aggregate Induced by Inorganic Salts

Fan¹,

Zhang²,

Dong³

et al. 2022

Minerals

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The impact of coagulant type and dosage on the clarity, zeta potential, floc size, and floc structure of a coal slurry suspension was investigated. The results showed that the critical coagulation concentrations of trivalent ions are 0.81 mM and 0.018 mM for coal–coal and coal–kaolinite, respectively, which are lower than those of divalent ions. The initial settling was more affected by AlCl3 and FeCl3 than MgCl2 and CaCl2, while the supernatant turbidity was significantly decreased at a lower dosage (0.06 mM) for trivalent ions, consistent with the classical Derjaguin–Landau–Verwey–Overbeek theory, zeta potential results, and adsorption behaviors of quartz crystal microbalance with dissipation. The floc size and settling rate induced by AlCl3 and FeCl3 were greater than those of divalent ions at lower concentrations and tended to have an irregular and porous structure, enhancing the coagulation effect. The findings highlight the differences in the physical characteristics of floc size and structure in optimizing the coagulation process produced by electrical neutralization and sweep-floc coagulation of amorphous metal hydroxide precipitates.

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“…Due to the unreasonable payoff distribution system [36,44,72] of mineral resources and the inadequate supervision of local government, mining enterprises fail to fulfill their social responsibilities, which will bring local community some bad effects, such as environmental pollution, ecological damage [19,35,58], low level of resource utilization and losses of social welfare. Therefore, local government should improve the distribution system of mineral resources development payoff and strengthen the supervision and punishment.…”

Section: Game Between Local Government and Local Communitymentioning

confidence: 99%

Research on evolution of collaboration mechanism of stakeholders in mining enterprises’ implementation of social responsibility

2021

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Multiple stakeholders are involved when mining enterprises assume their social responsibility, so a tripartite game pattern among local government, mining enterprises and local community is formed after supervision is introduced. By combining evolutionary game model with system dynamics for simulation analysis, this paper studies the dynamic game process among the three parties and we find out that: (1) local government, mining enterprises and local community will eventually reach a stable equilibrium state (supervision, participation, performance), and it will simplify the evolutionary path of the stable equilibrium state when local government chooses supervision at the early stage; (2) local government plays a leading role in supervision, and the strategy choices of mining enterprises and local community depend on local government's strategy and the relationship between the size of exogenous; (3) the formation of the eventual stabilization strategy is decided by the joint action of multiple variables, although every single variable will affect the strategy choice of all parties, so local government should deal with the relationship between various stakeholders properly.

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The Effect of Surface Charge on the Separation of Pyrite from Serpentine by Flotation

Cited by 16 publications

References 31 publications

Impact of Iron Minerals in Promoting Wettability Alterations in Reservoir Formations

Impact of Iron Minerals in Promoting Wettability Alterations in Reservoir Formations

Characteristics of Coal Slurry Aggregate Induced by Inorganic Salts

Research on evolution of collaboration mechanism of stakeholders in mining enterprises’ implementation of social responsibility

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