TY - JOUR
T1 - Application of coupled thermostatted columns in civil engineering and for leaching heavy metals of wastes from foundry sands and mining industry
AU - Vite-Torres, J.
AU - Díaz-Calva, A.
AU - De León, C. Carreño
AU - Vite-Torres, M.
PY - 2003
Y1 - 2003
N2 - For many years, the mining industry at Pachuca Hidalgo, México, has produced silver and gold through a cyanide process. Solid wastes (tailings) of this process have been deposited close to centres of population. Many of the metals in these wastes are dispersed via wind and rain, and can be toxic to flora and fauna. Foundry sands are wastes, produced by the automotive industry, the metallurgy industry and others, which are contaminated with many metals such as Fe, Cr, Zn, Pb, Au Ag, Ti, Ge, Co, As, Al, etc. We have previously patented a process for the extraction of toxic and valuable metals from foundry sands using a thermostatted column. The results of this study indicate that the process and the device could be used for removing heavy metals from tailings. In this research both types of waste (foundry sands and tailings) were leached using four coupled thermostatted columns. The presence of heavy metals in the solid wastes was studied using the ICP-AS technique and scanning electron microscopy, and to study the structure we used X-ray diffraction. After leaching we used the solid wastes (without toxic metals) to produce bricks. The mechanical properties of the bricks were assessed against international standards.
AB - For many years, the mining industry at Pachuca Hidalgo, México, has produced silver and gold through a cyanide process. Solid wastes (tailings) of this process have been deposited close to centres of population. Many of the metals in these wastes are dispersed via wind and rain, and can be toxic to flora and fauna. Foundry sands are wastes, produced by the automotive industry, the metallurgy industry and others, which are contaminated with many metals such as Fe, Cr, Zn, Pb, Au Ag, Ti, Ge, Co, As, Al, etc. We have previously patented a process for the extraction of toxic and valuable metals from foundry sands using a thermostatted column. The results of this study indicate that the process and the device could be used for removing heavy metals from tailings. In this research both types of waste (foundry sands and tailings) were leached using four coupled thermostatted columns. The presence of heavy metals in the solid wastes was studied using the ICP-AS technique and scanning electron microscopy, and to study the structure we used X-ray diffraction. After leaching we used the solid wastes (without toxic metals) to produce bricks. The mechanical properties of the bricks were assessed against international standards.
KW - Bricks
KW - Civil engineering
KW - Coupled thermostatted columns
KW - Foundry sands
KW - Heavy metals
KW - Leaching
KW - Tailings
UR - http://www.scopus.com/inward/record.url?scp=0037594895&partnerID=8YFLogxK
U2 - 10.1504/IJEP.2003.003306
DO - 10.1504/IJEP.2003.003306
M3 - Artículo
SN - 0957-4352
VL - 19
SP - 46
EP - 65
JO - International Journal of Environment and Pollution
JF - International Journal of Environment and Pollution
IS - 1
ER -