상동광산 광미의 특성 및 순환자원화 연구

Abstract

This study has investigated on the possibility for recycling mine solid waste as diversion materials. The tailings from the Sangdong mine were checked for basic properties such as mineralogical compositions, chemical compositions, and particle size distribution. The mineralogical and chemical compositions of the tailings samples were not largely different with depth. According to leaching test by KSLT, concentration of heavy metals leached from the tailings was less than the standard limited values. As a result of particle size analysis, the median diameter of the tailings was in the range of 10 to 30㎛. The stable tailings slurry was prepared by adding 4wt% Polyethyleneimine(PEI) as dispersing agent by attrition mill. Concentrated slurry was extended to 3 times by foaming method. In the case of 3 times foamed slurry, the total porosity and open porosity of ceramic support was about 80% and 72%, respectively. The pore size was the range of 30~350㎛. Slump-flow of self-compacting concrete(SCC) was decreased with increasing replacement of tailings. But time required to reach 500㎜ of slump flow(sec), time required to flow through V-funnel(sec) and filling height of U-box test(㎜) were satisfied in a prescribed range. The compressive strength of SCC was decreased with increasing replacement of tailings, splitting tensile strength and elastic modulus were similar to those of normal concrete. Therefore, the tailings from the Sangdong mine could be recycled as starting material of porous ceramic support and as admixture for SCC.