The samples that used in experiment were MgCO3 and Mg(OH)2, CaCO3 and Ca(OH)2 in powder form calcination at 800C for 4hr. The samples were injected into the high concentration heavy metal contamination artificial drainage(AFAD) to evaluate the purification efficiency after the 24hr reaction. Concentrations of heavy metal contaminated water that used in this experiment were Cd 103.04, Cu 135.22, Fe 322.90, Mn 209.40, and Zn 2,217.99 mg/L. Samples of 100g were added to 500mL contaminated water and reacted for 24 hr, and pH measurements and supernatant sample were collected at regular time interval, and heavy metal concentrations were measured using ICP/AES. The pH of contaminated water increased over 12.0 after 0.1 h of reaction with CaCO3 and Ca(OH)2, and kept constant at 12.16 and 12.29 after 24 h, respectively. The pH values of MgCO3 and Mg(OH)2 were 5.62 and 6.08, and increased to 6.95 and 6.61 after 24 hours. Removal efficiency of CaCO3 and Ca(OH)2 for 0.1 hr after reaction showed 100% for Cd and Mn, and 99% or more for Zn, Cu, and Fe. After 0.1hr of reaction with MgCO3, concentration of Cd and Fe decreased to 0.69, 9.50mg/L, respectively. Heavy metal removal rate of MgCO3 were over 90% for Cd and Fe, about 30% for Cd, Mn, and Zn. Removal efficiency of Mg(OH)2 after for 0.1 hr reaction showed 99% for Cu and Fe, and 1.5% for Cd and 27.41% for Zn. After 24hr of reaction, removal efficiency of Cd, Zn and Mn were 57%, 81%, and 33.57%, respectively.

Neutralization ability of carbonate and hydroxide in artificial acid drainage

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