A separation method and system for particle mixture

Abstract

The embodiment of the invention provides a method and a system for separating a particle mixture. The system comprises a feeding device, a separating device and collecting devices, wherein the separating device comprises an oblique sliding plate and an air blower arranged at the bottom of the sliding plate. According to the characteristic that different material particles in the particle mixture have different gravities, the particle mixture is primarily separated by the sliding plate, air is blown to the primarily separated particle mixture by the air blower, particles with smaller gravity fall into the collecting device farther away from the separating device, and particles with large gravity fall into the collecting device closer to the separating device, so that the particle mixture is separated and the separation efficiency is higher; and the system is simple in structure, and a magnetic field is not required in a separation process, so that the environment cannot be polluted and the input and running costs are low.

Description

technical field [0001] The invention relates to a separation and recovery technology of particle mixture, in particular to a method and system for separating crushed particles of waste electronic circuit boards. Background technique [0002] At present, China has become a major producer of circuit boards. As the basic material of electronic appliances, the number of defective products and scraps in the manufacturing process is increasing year by year. At the same time, as my country's household appliances have entered the peak period of scrapping, the number of waste circuit boards is increasing rapidly. Waste circuit boards include waste copper clad laminates, waste printed circuit boards, printed circuit board cards with integrated circuits and electronic devices. Waste circuit boards have a very high economic value. The metal grade in the circuit board is equivalent to dozens of times the metal grade in ordinary minerals. The metal content is as high as 10%-60%, and the ...

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Problems solved by technology

However, magnetic separation uses a magnetic separator to separate magnetic metals, and non-magnetic metals cannot be separated; electric separation is suitable for the separation of light metals and plastics with similar specific gravity, and requires the feed particles to be regular in shape and particle size It should not be too small, and the separation effect on heavy metals (such as copper) is poor; the copper powder produced by gravity separation technology contains high impurities, which is not convenient for direct use, and copper contains lead and tin, and the metal recovery rate is low

In addition, waste circuit boards will produce a large amount of pollutants harmful to the environment during the incineration and smelting process. Therefore, the focus of using pyromelting technology and incineration technology to treat waste circuit boards is to pretreat waste circuit boards before they are put into the furnace. , burn the organic matter, and effectively treat the flue gas to eliminate its pollution to the environment, and then process it, the cost is relatively high

[0004] From the above analysis, it can be seen that the existing separation and recovery technologies for the crushed particles of waste circuit boards have the problems of high cost and low separation efficiency.

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