Method of processing radio electronic crap

FIELD: process engineering.

SUBSTANCE: invention relates to combined methods of separation of solid materials, particularly, to processing of radio electronic scrap. Proposed method comprises primarily two-step separation of solid materials by hammer crushers to required size, magnetic and screen separation of ground scrap with subsequent pneumatic classification by bulk density of oversize and undersize products of screen classification. Note here that ground scrap fraction of boundary size obtained at pneumatic classification is subjected to additional grinding at ball mill to size of nonmetallic component of not over 1 mm. To isolate metallic component of processed scrap aforesaid ground fraction is subjected to pneumatic classification by bulk density.

EFFECT: higher efficiency of processing.

 

The invention relates to the separation of solid materials using a combination of separation methods, such as magnetic, gravity separation and pneumatic cascade-gravity classification, and may be the most widely used in the processing of electronic scrap to extract the metals and plastics sorting.

In the processing of electronic scrap inevitably formed irretrievable waste containing metals and materials, polluting the environment and leading to the loss of raw materials.

There is a method of processing electronic and cable scrap patent RF №2166378, IPC VS 7/08, 1999 and No. 2321462, IPC WV 9/06, 2006, including crushing, grinding, classification by particle size smaller than 5 mm and electrical separation.

The disadvantages of the known methods is the need for crushing and grinding of obtaining crushed particles not more than 5 mm to ensure separation of the ground particles of scrap in bulk density by electrostatic separation.

In addition, the use of electrostatic separator, the source of increased danger, imposes increased demands on production location and the staff.

A method of refining mixtures of plastics and installation for processing mixtures of dps is stmas by the RF patent №2150385, IPC WV 17/00, 1995, including, including the stage of grinding material, preferably with the help of cutting roller mill, extraction of magnetic materials using suspended magnet, the classification of the dimensions for separating fine particles using a drum screen, separation (classification) heavy fractions using a pneumatic classifier, homogenization (fine grinding) of the processed material, re-screening (classification) of fine-grained material with a drum screen, the filtration of coarse-grained material using a rod rumble, remove (classification based on the geometric dimensions) formed during the process fractions excessive size and additional grinding these particles using a knife crusher.

The disadvantages of this method is also repeated grinding, especially with the help of cutting grinders, cutter grinders. The wear on the cutting edges of the cutting tool requires timely replacement to ensure the required degree of size reduction, elimination of breakdowns and accidents. Grinding with the help of cutting grinders and blade grinders in the known methods due to the necessity of obtaining crushed particles of the processed product is not more certain geometric dimensions (the same is consequently identical) to highlight the components of processed scrap by multiple classification using screens and pneumatic classification.

There is a method of recycling waste lamps under the patent of the Russian Federation No. 2035244, MKI VW 1/00, 1995, which, according to the authors, can be adopted for the prototype. The known method includes the crushing of the raw material, classification by size of constituent particles, magnetic and electric separation, and the crushing of the raw material is produced in jaw and roll crushers, and then the resulting material is classified according to the geometrical sizes with a selection of oversize and undersize products. Undersize product is again subjected to further fragmentation in the cone inertial crusher with subsequent magnetic separation of the crushed product, non-metallic product fraction is classified again by geometric sizes for selection of oversize material metals, and undersize material is again subjected to crushing to a particle size of 1 mm and subjected to gravitational enrichment for isolation of products containing metals, which are again subjected to magnetic and electrostatic separation. As can be seen on this well-known method of processing multiple crushing(grinding) of the source material is consistently in jaw and roll crushers, after classification underflow again subjected to crushing in a cone inertial crusher, then dumb the magnetic fraction of the newly classified to highlight undersize product, which again undergoes gravitational enrichment for isolation of products containing metal by magnetic and electrostatic separation. In addition, in the known method, crushing and grinding is carried out in the jaw, roll and cone inertial crusher is designed for crushing brittle materials with low ductility of the as milled material in this case is destroyed by crushing. Viscous and plastic materials, such as ductile metals and plastics, with such grinding does not shatter into individual elements, and rasprashivaete and, therefore, the grinding in such crushers irrational.

Famous hammer crusher for primary crushing of thin metal waste (Grubert. Preparation of the metallic secondary materials (resources, classification, grinding). M.: metallurgy, 1989, 359 pages Translated from German Popov GF, Rudenskogo YEAR

The use of hammer crushers, hammers which have substantially greater resistance when compared with knives knife and cutting shredders, it is not possible to control the formation process and obtain a comminuted particles of a given shape. The disadvantage of hammer crushers is also different trudnoporoshkuemye size obtained by brittle fracture changes cennych particles of the processed product. With this method of grinding the application of electrostatic and electrodynamic separation for separation of metals from the crushed product is not rational.

For the separation of metals from shredded hammer crushers electronic scrap used pneumatic classifiers, for example, patent RF №2313406, IPC V B9/02, 2006, in which the ground product of electronic scrap is allocated metal fraction for further processing, but in the classification on the pneumatic classifier is allocated and fraction products the boundary size, with shredded particles textolite (steklotekstolity) substrates containing copper, lead, tin with traces of precious metals and fine particles of other metals. Separate fine particles of the metal contained in this product is extracted using the screens, and the remaining fraction products of low bulk density interspersed with non-ferrous metals must be disposed or firing in the kiln system with post-combustion and gas cleaning.

The purpose of the invention to improve the technical efficiency of the recycling method.

This objective is achieved in that in the present method of processing electronic scrap, including the original grinding material, grinding produce, mostly two-stage, MoE is of Ottovich crushers with magnetic separation of shredded scrap at each stage of grinding, classification by size (the dimensions) after the last stage of grinding and pneumatic bulk density separately oversize and undersize product classification by size. The fraction of shredded scrap boundary size obtained by pneumatic classification, consisting of crushed particles textolite (steklotekstolity) substrates of electronic scrap containing copper, lead, tin with the remnants of the precious metals, is subjected to additional grinding in a ball mill to a particle size of non-metallic component of this product is not more than 1 mm, and again the resulting milled product is subjected to pneumatic classification for the selection of metallic impurities.

The essence of the invention lies in the fact that the alleged new set of features, namely:

grinding the original scrap in hammer mills, mainly in two stages;

subsequent magnetic separation after each grinding stage;

separation of shredded scrap the dimensions after the last, mainly the second grinding stage for the selection of oversize and undersize products;

a separate pneumatic classification bulk density of oversize and undersize product 4 product:

fraction high the lines density, mainly copper and albanito-lead alloys;

light fraction products of low bulk density (plastics), but relatively large geometrical dimensions;

dust fraction is the smallest (dispersed) non-metallic particles of processed scrap;

fraction products the boundary size and specific density is mainly crushed particles textolite (steklotekstolity) substrates of electronic scrap containing copper, lead, tin with traces of precious metals;

subsequent grinding in a ball mill products boundary size and density to a particle size of not more than 1 mm non-metallic component of the product boundary size;

pneumatic classification of the crushed ball mill product to highlight a metal component of the crushed fraction.

Announced a new set of features of the method of processing electronic scrap allows you to increase the depth of processing is to reduce the deadweight loss of scarce materials such as copper and albanological alloys - electronic scrap, reduce the number of degrees of grinding the processed scrap, refuse to use for grinding knife grinders and electrostatic separators for separation of metals that strengthen the AET technology processing and reduces both capital and operating costs.

Example. In the South Urals specialized recycling center recycling of electronic units mounted Assembly without prior disassembly of the total mass 2971 kg has been split in two stage hammer crusher to a particle size of not more than 15 mm Crushed by the crusher product at each stage was subjected to magnetic separation. The non-magnetic fraction of the product was subjected to classification by size (the dimensions) on the screen. Oversize and undersize products screening each separately subjected to classification by a pneumatic cascade-gravity classifier with a corresponding adjustment of the air flow through the main perejitye modules classifier depending on the size of the processed comminuted mass of the product of bulk density on 4 types of products:

the finished product is crushed particles of high bulk density copper and albanito-lead alloys; waste - crushed particles of low bulk density of plastic particles without foreign inclusions;

pulverized waste - the smallest non-metallic fine-dispersed particles removed by the system vacuum cleaners;

particle marginal density of the crushed particles textolite (steklotekstolity) substrates of electronic scrap containing copper, lead, tin with OST DAMI precious metals and fine particles of metals total weight 255 kg;

The crushed particle marginal density total weight 255 kg was subjected to regrinding in a ball mill.

Ball mill product to grind to a particle size of only plastic part is not more than 1 mm, the particle Size of grinding metal inclusions are not regulated.

Crushed in a ball mill product total weight 255 kg was again subjected to pneumatic classification with appropriate adjustment of the air flow through the main perejitye modules latter, the particle size of the crushed ball mill plastic part of the product.

Pneumatic classifier in this case has allocated 4 product type:

the finished product is crushed particles having a high bulk density of the fine particles of metals - copper and albanito-lead alloys - total weight : 19 kg;

waste - crushed particles of low bulk density - plastic non-metallic inclusions;

waste - crushed particles of low bulk density smaller geometric dimensions - plastic;

pulverized waste - the smallest non-metallic particles removed by the system of dust collection.

So declared by way of 255 kg faction boundary density of the processed electronic scrap allocated 19 kg magnetodynamic and albanito-lead alloy, which showed the possibility is realizatsii way characterized in the claims, and to increase the depth of processing of electronic scrap 0.63%without the use of knife grinders, electrostatic separation, to reduce the number of stages of grinding.

Decided to industrial use of the proposed method of processing.

A method of processing electronic scrap, including predominantly two-stage grinding in a hammer crusher, magnetic separation, classification screen mesh after the final grinding stage according to the size and classification of pneumatic bulk density separately oversize and undersize sieve products classification, characterized in that the fraction of shredded scrap boundary size obtained by pneumatic classification, is subjected to additional grinding ball mill to a particle size of non-metallic component fraction is not more than 1 mm and the newly formed shredded mass is subjected pneumatic classification bulk density for the allocation of a metal component.



 

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