... quality scores ,% ≥——————99.097.092.0Insolubles quality scores ,% ≤0.0200.0500.100.0200.0500.10PH value (50 g/L ... ≥4.04.0——3.03.0——Chloride (in Cl meter) mass fraction ,% ≤0.200.60——0.200.60——(Pb),%≤0.0020.0070.0100 ... .0010.0100.010(Fe),%≤0.0080.0200.0600.0030.0200.060(Mn),%≤0.010.030.050. ... 0050.10——(Cd),%≤0.0020.0070. ...