DESIGN AND OPTIMIZATION FOR HAZARDOUS JAROSITE WASTE RECYCLING IN ENVIRONMENTALLY SUITABLE COMPOSITE PRODUCTS USING RESPONSE SURFACE METHODOLOGY - Management of Hazardous Residues Containing Cd - page 66

Comp strength (kg/cm2)
Water absorption(%)
Shrinkage (%)
Density (g/cc)

160

140

120

100

80

60

40

20

0

0 10 20 30 40 50

CCRs(%)

Figure 9 (c). Effect of CCRs on the mechanical properties of jarosite composites made
using jarosite waste to clay ratio 3 with CCRs.

Figure 9 (d). Effect of CCRs on the mechanical properties of jarosite composites made
using jarosite waste to clay ratio 4 with CCRs.

3.2.3. Effect of Sintering on Mineralogy and Microstructure of s/s
Jarosite Products
Firing of clay products leads to mineralogical, textural, and physical
changes that influence their quality. During high temperature firing, the
reaction behavior of temper grains (jarosite waste- clay matrix) is dominated
by dis-equilibrium conditions and characterized by the presence of different
reacting substances. When firing clay or compounds of silica and alumina
above 900 ºC, new crystallite phases are formed which are Al-Si spinel and
mullite (Peters and Iberg, 1978); Lingling et al., 2005). This is further
confirmed by earlier work on clay and pottery firing (Qrts, et al., 1993;