Triboelectric Sorting Machine Mineral Particles Research And Analysis Of Dynamic Characteristics

Electric separation is a very high efficiency physical separation. Electric separation is better than other methods which are physical and chemical mineral processing, for example electric separation is easy to run, economical, doesn't produce waste water and friendly to environment, so researched and applied on electric separation will be more and more in-depth and extensive.At present, main trends of electric separation are research new types, high-efficiency, big processing capacity and more varieties equipments; Researched on the dynamics characteristic of mineral particles in the process of electric separation, structure of energy level of particles'surface and the technology of mineral's surface treatment which influences the process of electric separation and so on.Base on studying the charger-roller triboelectrostatic separator and the vibration-triboelectrostatic separator, this paper establishes mathematical model which is particles in the tribocharging device of triboelectrostatic separator, analyses charged particles'trajectories which in the high-voltage electrostatic field of the triboelectrostatic separator, testes the charged particles'trajectories in the the high-voltage electrostatic field using experiments, so theoretical results are proved in this paper, and build the foundation of triboelectrostatic separators that will be applied in industry.After particles come into the charger-roller triboelectrostatic separator or the vibration-triboelectrostatic separator, first of all, they pass through the tribocharging device of the triboelectrostatic separator. Particles which have different dielectric constant will be charged by particles contact, friction and impact with each other or particles contact, friction and impact with a material surface of the tribocharging device. Particles'tribocharge electricity is researched in this paper, and deduced the mathematical model which is particles in the tribocharging device of triboelectrostatic separator, The mathematical model pointes out the relationship of particle's size,mass,density,physics and chemistry's inherent characters with tribocharge electricity of particles.Charged particles reach into the high-voltage electrostatic field from the distributor, they are separated in there. According to the principle of the same charges will be excluded, and different charges will be attracted, positive charged particles move to the negative plate in the high-voltage electrostatic field, and negative charged particles move to the positive plate; electric field force doesn't influence particles which doesn't charged, those particles trajectories are vertical line in the high-voltage electrostatic field. In the high-voltage electrostatic field bottom particles are separated three products which are concentrate, middling and tailing. This paper analyses the forced on particles in the high-voltage electrostatic field, establishes force model which charged particles are forced in the high-voltage electrostatic field, deduces the relationships with particle's tribocharge electricity, electric field intension, particle's mass, airflow's traction on particle's forced, and theoretical analyses about particles trajectories in the high-voltage electrostatic field.On the basis of the theoretical analysis, considering those factors that include roller rotary speed, airflow's speed, particle's size, electric field intension influence particles'separated trajectories in the charger-roller triboelectrostatic separator; and considering those factors that include vibration's frequency of the tribocharging device, electric field intension of the tribocharging device,airflow's speed, particle's size, electric field intension influence particles'separated trajectories in vibration-triboelectrostatic separator, this paper using the experimental analysis to proved the theoretical study results.Researched and analysed dynamics characteristic of mineral particles in two types triboelectrostatic separator which are the charger-roller triboelectrostatic separator and the vibration-triboelectrostatic separator, which are signality for industrial design and application of triboelectrostatic separators.