Abstract
The aim of this article is to present possibilities of producing aggregates with an increased content of regular particles in some well-known examples, as well as to present previously unused methods of aggregate production. Traditional aggregate production systems require the use of three or four grinding stages (depending on the particle size of the feed), but fine fractions contain approximately 10% irregular grains on average. The conducted research has shown that in innovative patented technological systems, it is possible to obtain regular aggregates with a share of irregular grains below 3%. The separated irregular aggregates can be crushed again or used for other purposes. The advantages of such inventions include less grinding stages, reduced dust, and lower energy consumption. Regular aggregates also have benefits compared to typical ones. The analyzed aggregate products from various mines showed that regular aggregates have better properties, for example, higher resistance to grinding and abrasion. This article also describes the advantages of using such aggregates for concrete or other applications.
Highlights
Quality requirements for aggregates, protection of the Earth’s natural resources, increased use of industrial waste, and minimization of energy consumption are placing increasing challenges on raw material processing plants
Conducted analyses of the production of crushed aggregates from various raw mineral materials show the principle that the shape of the aggregate grain is affected by the structure, texture, hardness, and splitability of the raw material, among other properties
These features depend on the lithology and origin of the raw materials
Summary
Quality requirements for aggregates, protection of the Earth’s natural resources, increased use of industrial waste, and minimization of energy consumption are placing increasing challenges on raw material processing plants. A specific market may require large volumes of products with a narrow grain size distribution and specific grain shapes. The physicochemical properties of the material, such as the density, hardness, strength, and structure, depend on the place of exploitation (the formation of the raw material) and for this reason, they are generally unchangeable in mineral processing. The desired particle size and shape or surface texture, on the other hand, are achievable depending on the processing methods used during their manufacture (especially crushing) and may directly affect other characteristics. The most important rock raw materials for civil engineering are crushed aggregates produced from magmatic, sedimentary, and metamorphic rocks [1,2,3]. All types of aggregates are widely used in the construction of road pavement layers
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