DESIGN AND OPTIMIZATION FOR HAZARDOUS JAROSITE WASTE RECYCLING IN ENVIRONMENTALLY SUITABLE COMPOSITE PRODUCTS USING RESPONSE SURFACE METHODOLOGY - Management of Hazardous Residues Containing Cd - page 58

Table 5. Chemical characteristics of PCCRs, jarosite waste and clay

Elements % concentration (mean triplicates)

PCCRs Jarosite waste clay

SiO 2 57.99 3.45 60.65

Al 2 O 3 21.91 2.55 16.22

Fe 2 O 3 10.72 51.28 12.43

MgO 3.97 1.87 2.28

CaO 0.84 6.49 2.15

Table 6. Trace elements in jarosite waste and PCCRs (ppm)

Parameters Jarosite waste PCCRs

Manganese 1970 500

Copper 1043 87

Nickel 87 102

Chromium 178 90

Cadmium 317 38

Cobalt 38 59

Table 7. Radioactivity of PCCRs and jarosite waste

Radionuclide
(Bq/kg)

Activ ity level of radionuclide

PCCRs Jarosite waste Upper Limit

40 K ( Emitters)

281.8 ± 6.44 294.66 ± 17.68 925

226 Ra ( Emitters

54.13 ± 0.80 55.40 ± 0.86 370

228 Ac ( Emitters)

74.03 ± 9.57 72.00 ± 3.47 259