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At the same time a great amount of siftings of crushing which result from the processing of the rock are not used in full and are often assigned to wastage. They are stored in slag-heaps and this leads to the en-vironmental pollution while they could become marketable products which price is many times higher than that of the siftings.
After the siftings are processed through the classifying complex it is available to obtain pebbles, con-struction sands, fillers and other materials. The essential part of the line for obtaining man-made fractionated sands is a multi-product air cascade-gravity classifier which makes it possible to separate the siftings into the required number of fractions. The installation of only one line on siftings classification permits the obtaining of about 200 thousand tons of commercial output per year.
At present, man-made sands have already been successfully applied in manufacture of building materi-als. In so doing the quality of the materials based on man-made sands occurs in most cases higher than that of similar materials based on the natural sand.
The carried out research showed that the bending strength of fine-grained concrete based on the sand crushed through the impact-centrifugal crusher outperforms by 36 % a similar index of the concrete based on the bank sand. With this, the concrete based on the sand crushed in the cone-inertial crusher has the excess in strength by 29 %. A similar relationship is true also for a durability factor of fine-grained concretes at com-pression resistance.
The fractionation of powder aggregate is one of the promising aspects in improving the quality of building materials. It is found that fractionated sands permit the obtaining of the concrete which surpasses in durability the concrete with both bank sand and not fractionated crushed sand or to provide cement saving. Thus, to obtain concrete durability unit (1 MPa) with the crushed fractionated sand the demand for cement is 19 % less comparing to the concrete with the bank sand and 17 % less comparing to the concrete with the non fractionated crushed sand.
We advice to read:
Методы получения искусственных песков из отсевов дробления горных пород
19.05.2012