ENVIRONMENT: Call For Coherent Recycling Strategy
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LEADING materials and minerals processing technology provider, IMS Engineering, says that it is time that there was a coherent strategy for construction and demolition (C&D) waste recycling in South Africa. “We need to take a leaf out of many European countries which have established well-organised, highly efficient recycling processes,” says IMS’s Shannon McEwan. “This would make a significant contribution to the quality of the environment while producing significant direct financial savings, not to mention business opportunities and jobs.”
He adds that one of the foundations of a successful recycling strategy is appropriate, fit-for-purpose machines for the job. “In essence this means machines that accept the right feed with a minimum of pre-preparation and produce clean separated saleable products in the fewest appropriate, economic steps.
“Companies are beginning to realise that, with the right technology and processes, they can unlock significant value from waste materials. In the construction industry this includes construction waste and demolition material in the form of rubble, concrete, steel reinforced concrete and asphalt.”
“When one takes into account the rising costs of all building materials, rising dumping costs, the increase in the fuel price and the negative environmental impact of dumping unprocessed C&D waste, it makes sense to re-use what useful construction materials you can, or to benefit from income derived from the sale of the recycled material such as clean G5 filler or such as selling recovered steel reinforcing to another recycler, instead of simply trucking loads of discarded building material to landfill sites.”
To this end, IMS Engineering, as a subsidiary of Hazemag & EPR GmbH, Germany, has geared itself to provide a broad spectrum of recycling solutions to the construction and recycling industries including its range of Hazemag horizontal shaft impact crushers and MinPro horizontal impact roll crushers .
Hazemag’s AP-PH primary impact crushers are specifically made to process concrete and building rubble, and in their mobile crushing plant format can process feed material of 600 x 500 x 500 mm lumps or slabs of 1 250 x 1000 x 250mm, or the equivalent of four concrete railway sleepers at one time, at feed rates of up to 250 t/h, producing more than 90% <50mm product in a single pass.
Hazemag’s AP-S secondary impact crushers are manufactured specifically for lighter-duty rubble recycling and can process feed material from 400mm maximum edge length at a rate of up to 250t/h. Hazemag mobile crushing recycling plants and designed to separate reinforcing steel and crushed materials into two saleable products.
A Hazemag screening and air pressurised soft and organic materials separating plant can be added to further clean up the saleable recycled material aggregate.
Use of these horizontal shaft impact crushers for the comminution process is noteworthy since they achieve a high crushing ratio and can also handle and separate the re-bars in reinforced concrete. Thus, the crusher product not only generates a usable construction aggregate, but also a considerable amount of valuable scrap metal, which is cleanly separated from the crushed rubble. Thanks to the design and ruggedness of the Hazemag impact crushers, wear rates are economical and downtime for maintenance and spare parts replacement is reduced.
Hazemag crushers are characterised in particular by the hydraulically supported impact aprons, the rotor with its high moment of inertia and the easy blow bar changing system.
The operation of the plant is very flexible, which gives the opportunity to produce for a wide range of products, says McEwan.
Another Hazemag technology used extensively in C&D recycling is the MinPro range of horizontal crushing technology, specifically the SB-type impact roll crusher feeder-breakers.
These machines are capable of reducing very long feed material such as concrete railway sleepers, pipes, masts and columns, and produce a quality crusher product while liberating the reinforcing steel associated with these materials. In fact MinPro SB-type impact roller crushers were used to crush the Berlin Wall after it was torn down in November 1989.
Meanwhile IMS has invested significantly in a comprehensive modernisation programme, which has wide-spread ramifications. “Part of this process has been the implementation of all modernisations and developments within the complete Hazemag product ranges, including the Hazemag impact crusher and double roll crusher ranges, as well as adoption of the latest Hazemag products such as the MinPro technology. Also significant for IMS Engineering is the reengineering on machines in particular the Kawasaki Cybas cone crusher range, with considerable emphasis being placed on reducing costs and improving competitiveness by optimising component design while also engineering increased performance capability. The result is improved production performance at lower capital and operating cost,” says McEwan.
IMS has also developed a state-of-the-art, proprietary crushing plant audit and remote monitoring system which monitors both machine and production thus collecting both process and crusher data.
“Through this process our engineers can give informed instructions to a customer that will help maximise crusher availability and performance.”
“This will not only reduce cost of ownership of the machinery, but will also make the entire process significantly more efficient,” says McEwan.
As part of the customer service growth and improvement programme IMS has opened a service centre in Kathu, which will service the buoyant Northern Cape, Namibian and Kalahari mining, quarrying and recycling industries. McEwan says that IMS is currently going through the process to identify locals with the necessary skills to embark on a special training programme to become expert in IMS techniques and technologies. “We realise that service excellence means being available in the more remote areas as well and our number of users in the Northern Cape region and beyond certainly justifies this move,” McEwan concludes.
IMS Engineering’s product range consists of Hazemag primary, secondary and tertiary horizontal shaft impactors, double-rotor primary hammer crushers, double roll crushers, mineral sizers, hammer mills, rapid dryers and apron, wobbler and reciprocating feeders, MinPro feeder-breakers and chain conveyors and Kawasaki primary and secondary gyratory, jaw and cone crushers and specialised milling technologies.
Added to this range are the market-leading high-pressure roller press technologies of Köppern.
These include HPGR for high pressure comminution, compaction presses and hot and cold briquetting technology.
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