In the past few years European Union introduced strict laws for land filling in order to maximize the recovery of recyclable materials. This aim currently cannot be realized by many European plants when they have to deal with mix cans waste from MSW.
This waste is composed by mix metals (above all iron, alumnium and steel) and home-made inert like nylon, plastic, glass, etc…The production of this kind of waste is increasing, according by the recent EUROSTAT report with about 42,3 millions of tons every year.
MSW waste is not homogeneous because of an ineffective collection in the capitals and in metropolitan cities.
The inert concentration can reach 60% compared to metals and it is considered to expensive to treat, but at the same time not complaint for the European landfills.
To maximize the recovery cycle, the enhancement of metallic proler could be an interesting business opportunity. In this way iron, steel, stainless steel and metals like aluminium, copper and brass could be reintroduced in the production cycle.
Anyway, foundries impose strict rules for an optimal cast of the product. Consequentially the companies cannot rely only on manual sorting, openers, or optical readers/X rays.
The solution is a grinding plant. A top quality hammermill frees the metals from inert, simplifies the final steps of separation and maximize the commercial value.
A company that takes this path need to ponder carefully the technical features of hammermill for scrap. Grinding the mix cans from MSW with not suitable models leads to serious economic and productive damages in a short-medium time.
During the process the hammermill undergoes to processing peaks, stressing many mechanical components, causing structural damages in the ineffective models.
The productive safety needs to be guaranteed by structures and armours suitable for MSW, speeding also the access of the elements involved in the grinding. These elements in comparison to other processes has higher wears, caused by the presence of glass and steel. A constant problem in hammermills with medium-low price range, economically penalizing productivity and spare parts management.
The suppliers which provide higher quality solutions have introduced successfully special cast alloys for horizontal hammermill. Hammers and grids have a slower and more gradual wear, keeping constant the output quality and avoiding the stops caused by light inert materials floating in the grinding chamber.
Flexibility in material treatment is an important feature for hammermills. The speed in changing the configuration of grids is essential, especially with this kind of waste. Nowadays few suppliers are able to ensure this essential feature in plants for the enhancement of mix cans from MSW.
The suppliers commitment and professionalism have enabled to renew the approach method of the treatment.
The material is not moved from a plant to another in order to be exported, buried or burned, even more plants are able to enhance metals from MSW, obtaining secondary raw materials and reintroducing them on the market.