Acid mine drainage (AMD) is extremely acidic and generally enriched in iron, aluminium, sulphate and heavy metals such as lead, mercury, cadmium and manganese. X-ray diffraction, scanning electron microscopy, inductively coupled plasma emission spectroscopy, and color-difference meter were used for the water chemistry, mineralogy, and color index analysis of metal precipitates from acid mine drainage. Precipitates from acid mine drainage can be use pigment of paint. The color of Fe, Cu, Mn-oxide/hydroxide precipitated from acid mine drainage changes with geochemical condition of water such as pH and concentration of metal. The color of precipitates associated with acid mine drainage present Munsell color system that specifies colors based on three color dimensions: hue, value (lightness), and chroma (color purity). Characteristic color of precipitates distinguish a fixed quantity of L, a, b. Color of precipitates that related with Mn-hydroxide is L=28.61 a=-5.96 b=19.69 in pH 4.0, L=20.15 a=-4.01 b=13.84 in pH 8.0, and L=14.86 a=-3.57 b=-0.20 in pH 10.0. Cu-hydroxide is L=36.18 a=-24.38 b=8.68 in pH 6.0, L=36.33 a=-28.09 b=10.54 in pH 8.0, and L=5.30 a=-0.60 b=0.21 in pH 10.0. Fe-hydroxide is L=18.37 a=8.18 b=12.29 in pH 4.0, L=28.66 a=0.85 b=8.03 in pH 8.0, and L=19.98 a=0.40 b=4.21 in pH 8.0. The mineralogy related to metal precipitates are goethite(FeOOH), ferrihydrite(Fe2O3�9H2O), gibbsite(Al(OH)3), zincite(ZnO), connellite(Cu19Cl4(SO4)(OH)32�3H2O), hausmannite (Mn3O4), hematite(Fe2O3) and aluminite(Al2SO4(OH)4�7H2O).

Color of Fe, Cu, Mn-oxide/hydroxide precipitate with pH in acid mine drainage

248th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.