Tóm tắt:

The study was aimed to reuse hydrometatlurgical pulp of Cu-Zn-Cd residues for concrete blocks production by forced vibration technology. The residue was mixed with cements, grit stone, yellow sand in different ratios: 40:35:15:10, 35:35:15:15; 35:30:15:20, forming concrete blocks. The burst pressures, compressive strength and possibility of metal leakage were measured by standard method of EPA-1311 with acidic environment of pH=4. Results showed initially that the burst pressure and total water absorption rate of the bricks met the requirements (referred as TCVN 6477:2016). After being immersed in acid solution with pH=4 for different time (74-14 days), the acid resistance of bricks met the requirements. The research results also indicated that the ratio between pulp and other materials was 40:35:15:10. Solidification and stabilization of hydrometallurgical pulp not only saved treatment cost but also created materials sources for construction.