Investigation into the comminution of mining rubbish and washery refuse with a view to its recovery
The purpose of the investigation was to find comminuting and screening processes suitable for reducing rubbish to grain sizes which could be used in the building industry as aggregates for masonry bricks, paving stones and concrete. Certain requirements must be met in respect of the shape and strength of the grains, their frost resistance and their content of harmful organic and clayey components, to ensure that they can be used. Basic tests were carried out on ways of exposing and separating components containing coal and clay and of making aggregates of suitably shaped grains by comminuting rubbish. Machines of various constructions were used, and the rubbish was taken from pits selected on a regional basis. A project for two-stage comminution of rubbish using rebound crushers has been worked out, taking the results obtained into account. At the first stage (pre-comminution) a considerable proportion of organic and soft, clayey material may be exposed, utilising the selective comminution effect, and separated from the crushed rubbish by screening. At the second stage (post-comminution) good quality material can be produced from the coarse substance. Materials made by this process were found to have characteristics acceptable to the building industry when used as aggregate for sand-lime bricks and concrete mouldings. The capital cost of a two-stage rubbish comminution plant with a throughput of 100 000 tonnes per annum for making chips and sand is about 1.8 million DM. Rough calculation of operating costs gives a figure of 6.00 DM per tonne of product.
Bibliographic Reference: EUR 12316 DE (1989) MF, 75 pp., ECU 4, blow-up copy ECU 10
Record Number: 198911074 / Last updated on: 1994-12-01
Original language: de
Available languages: de