Assessment of Selected Characteristics of Enrichment Products for Regular and Irregular Aggregates Beneficiation in Pulsating Jig

Abstract

Article concerns problem of jig beneficiation of mineral aggregates and focuses especially on problem of separation of hard-enrichable materials. Investigative programme covered tests in laboratory and semi-plant scale and material with different content of regular and irregular particles, along with various particle size fractions, was under analysis. Two patented solutions were utilized as methodological approach and densities and absorbabilities of individual products were determined and major novelty of approach consist in separate beneficiation of regular and irregular particles. Results of laboratory investigations showed that more favorable separation effectiveness was observed for the narrow particle size fractions of feed material. In terms of absorbability difference between separation products from I and IV layer was 0.4–0.5% higher for regular particles, and up to 0.5% higher for irregular grains. Differences in densities of respective products were 0.1% higher for regular particles. Results of semi-plant tests confirmed the outcomes achieved in laboratory scale. The qualitative characteristics of separation products in terms of micro-Deval and LA comminution resistance indices were one category higher for regular particles, and two categories higher for irregular grains, comparing to the raw material.

Production Methods for Regular Aggregates and Innovative Developments in Poland

“…Research [44] showed that irregular granite grains used in special concretes might increase their elasticity. The obtained chalcedonite aggregates and gravel with irregular grains by additional enrichment with water-pulsed jigs allowed the production of aggregates with high porosity and water absorption [45][46][47]. Especially, chalcedonite aggregates with an increased specific surface and porosity are particularly suitable for the production of filters and as a component of raw materials supplied in the burning process (production of lightweight aggregates and cement clinker).…”

Analysis of the Aggregate Production Process with Different Geometric Properties in the Light Fraction Separator

“…Similarly, materials were prepared for separation in the full grain size range, i.e., 2.0-16.0 mm. The exact scheme of preparation for selected fractions of regular and irregular grains is shown in publications [16,44]. Achieving the main research objective made it possible to define guidelines for the regulation of certain work parameters for the newly constructed prototype of a light fraction separator-first in a laboratory scale and then in an industrial scale-to be used in the technological system.…”

“…Earlier studies confirmed these results, which showed that screening of feed material into narrow particle size fractions as well as the separation of these fractions in terms of shape brings more favorable results using pulsating movements to enrich aggregates. This is due to the narrowing of the parameters for the relevant aggregates and the elimination of equally settling particles [16,46].…”

“…To introduce this practice, well-known enrichment methods have been implemented in water-settling machines for cleansing gravel-sand feeds of the organic and mineral impurities that occur in them [12,13]. Experimental work has shown that the use of typical settling machines to enrich various materials, including aggregates, can be troublesome due to slight differences in the densities of the fractions separated [14,15]; in addition, it is best to separate narrow grain size fractions to eliminate the phenomenon of equally settling grains [16][17][18].…”

Analysis of the Equipment and Technologies for the Enrichment of Crushed Stone From Industrial Waste for the Construction of Transport Infrastructure Facilities

“…Отсадка представляет собой один из гравитационных методов обогащения, основанный на расслаивании зерен обогащаемого материала в попеременных восходящем и нисходящем потоках воды [8].…”