Method and apparatus for recovering solid waste material containing metal

Abstract

The invention discloses a method and an equipment of recycling solid waste with metals. The invention comprises the procedures as follows: (1) the solid waste with metals is rough shattered by a slicer, a primary crushed is carried out by a shear mode crusher and a second crushed is carried out by a speed variable hammer crusher; (2) the material is extracted into a gravity separator and a cyclone separator by a centrifugal fun after being second shattered. (3) Dust with metal which is less than 60 meshes is sent into a vibrating screen after falling into a dust collecting hopper of the cyclone separator. (4) Material powder which is more than 60 meshes goes into the vibrating screen. The separation of metal from nonmetal can be realized by a high pressure electrostatic separator. The high pressure electrostatic separator which is used in the invention comprises a body and dust collecting polar plates which can continuously rotate. A plurality of dust collecting polar plates are fixed and connected in series by central axis. The central axis is connected with a motor. A discharge electrode and a scraper are arranged between every two dust collecting polar plates. The invention has high metal recovery rate and the system of the invention operates automatically, which is harmless to the environment and has obviously economical benefit.

Description

technical field [0001] The present invention relates to a method and equipment for recycling metal-containing solid waste. Background technique [0002] With the acceleration of the replacement of electronic products in the world, the number of scrapped electronic devices is increasing sharply, causing serious environmental pollution and huge waste of resources. The problem of recycling electronic waste needs to be solved urgently. Among them, the recycling process of electronic waste is the biggest problem. Is the recycling of printed circuit boards. [0003] The traditional recycling process of circuit board waste and electronic waste is cyanide to recover precious metals such as gold, waste incineration or water-milling wet treatment process to recover copper and other metals; cyanide to recover precious metals, such a treatment process produces a large amount of highly toxic cyanide during the treatment process. In the process of incineration and recovery of metals, a l...

AI Technical Summary

Problems solved by technology

The processing capacity of this equipment is 300kg / h, and it costs about 200 million yen, which is quite expensive

[0007] At present, similar processes are used in the recycling of waste lines in China, but there are mainly the following defects: 1. Incomplete crushing or the recycling system cannot be used due to abnormal operation of the crushing process; 2. The sorting process is relatively rough and the separation rate is not high. ; 3. Non-metallic powder cannot be processed after recycling; 4. The crushing and separation process consumes a lot of energy, making it difficult to achieve harmless separation

[0014] At present, the existing high-voltage electrostatic equipment on the market is mainly an electrostatic separator with a drum structure for dust collection. The surface area of ​​the drum is used as the area of ​​the dust collection plate. The non-metallic powder on the surface of the drum is separated, and the metal powder falls into the collection area under the separator to realize the separation of metal and non-metallic. In this way, the surface of the drum is continuously cleaned by the scraper to remove the adsorbed powder, so that the surface of the drum is always It is kept relatively clean, and the stability of dust collection on the plate is good, but because only the surface area of ​​the drum is used as the area of ​​the dust collection plate, it is difficult to achieve large-area dust collection, and it is also difficult to reasonably set up the discharge electrode, so that the efficiency of dust charging is greatly improved The separation rate and processing capacity of metal and non-metal are relatively low, resulting in the low purity of metals sorted by this type of electrostatic separator, and the separation efficiency is not high; the structure of another high-voltage electrostatic precipitator is mainly fixed Type anode dust collecting plate and fixed discharge electrode structure, the electric field structure design is relatively mature, can achieve a larger dust collection area and better dust collection effect, through the test, the effect of separating metal and non-metal powder is very good, However, the surface of the plate can only be cleaned manually by disassembling the plate or by vibrating. This treatment method has the following defects: First, the equipment cannot run continuously, and the equipment cannot work when cleaning or vibrating. , a large amount of dust will be generated during dust removal; second, it is difficult to set up metal collection areas and non-metal collection areas, and it is difficult to realize automatic operation. There is no record of using this kind of equipment as electrostatic separation equipment.

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