524 Table 4 – Initial sample and cleaned solution characterization. Sample Sample Type As As removal FeCl addition MgO addition mg/L % g/L g/L SB1 Arsenic-bearing acid 8,620 99.9 18.07 17.0 SB1-Clean Neutralized SB1 7.14 This test allowed to recover 28.1g (dry) of arsenic precipitate. Its characterization is shown in Table 5 below. Table 5 – Arsenic precipitate characterization. Sample Sample Type As content Cu Fe Mg Zn %wt. %wt. %wt %wt %wt SB1-PRE-AS Arsenic precipitate from SB1 16.9 4.39 11.6 13.9 5.65 This precipitate was directly amenable to vitrification as described in the following section. 3.3 GlassLock Vitrification: Product Quality and Environmental Compliance Both processing by-products (EC1 trioxide by-product and SB1 precipitate) were successfully vitrified. Arsenic in glass results and TCLP results are shown in Table 6. Table 6 – Glass formulation results Value Units Glass 1 Glass 2 From EC1 Pyrolysis Byproduct From SB1 Precipitation Byproduct TCLP result mg As/L 3.80 3.02 As in Glass %wt. 17.7 7.96
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