Study On The Foam Sol Clay And Its Characteristics For Controlling Coal Dust

During the mining,storage,transportation and use of coal,a large amount of dust will be generated,which is easy to cause coal dust explosion accidents and cause occupational hazards such as pneumoconiosis of workers.To ensure production safety and occupational health,effective techniques are needed to reduce coal dust concentrations to acceptable levels.In recent years,the research on foam dust suppression technology has been developing rapidly at home and abroad.In this paper,based on previous studies,clay foams were tentatively developed and their performance in coal dust control was studied in detail.The main components of FSC are FA,surfactant and thickener.The adsorption behavior of FA modified surfactant at gas-liquid interface was studied by means of contact Angle tester.The results show that the contact Angle of FA increases with the increase of surfactant concentration.When concentrations reached to the CMC,The electrostatic interaction between the particle surface charge and the ionized molecule drove the molecule to adsorb from the liquid medium to the surface of the FA particle,which made the FA stably adhere to the gas-liquid interface and gradually formed a monolayer three-dimensional network,thus impeding the drainage and coalescence of the foam.When the concentration exceeded the CMC,the surfactant formed a double-layer and particle cluster through chain interaction,which made the FA restore hydrophilic and caused the foam film to burst.The Zeta potential,viscosity and dynamic expansion viscoelasticity of FSC solution were studied by means of potential and nano-particle size analyzer,rheometer and contact Angle tester.With the increased of surfactant concentration,Zeta potential gradually increased and then remained unchanged at CMC,proving the electrostatic interaction between surfactant and surface charge of FA particles.The modified FA particles can increase the viscoelastic modulus,and the foamability and stability of FSC system with the same concentration can be determined by dynamic foam analyzer.The experimental results showed that the increased of viscoelastic modulus helps to enhance the rigidity,strength and stability of the foam structure.The main role of thickener in controlling coal dust was analyzed from the molecular level.By improving the surface activity of FSC solution,the liquid film could absorb coal dust more effectively.Finally,a FSC composed of 200g/L FA,35g/L surfactant and 1g/L thickener was obtained to adhere to the coal surface as a whole.It can control coal dust for a long time,which can ensure the occupational health and life safety of coal workers to a certain extent,reduce economic losses,and has good application prospects and high practical value.