The impact of industrial solid wastes on heavy metal solidification/stabilization of Magnesium Potassium Phosphate
Keywords:
industrial solid wastes, Magnesium Potassium Phosphate, solidification/stabilization, heavy metalAbstract
In order to examine the impact of admixture
amount on the heavy metal
solidification/stabilization effect of Magnesium
Potassium Phosphate cement (MKPC), industrial
dusts, iron ore tailings and slag were added into
Magnesium Potassium Phosphate containing 5g/kg
of heavy metals at the ratios of 0, 5%, 10%, 20%
and 30% respectively. Mixtures were firstly
conserved for 1d, 7d, 15d and 28d respectively at
conditions of 20±1? and humidity ?95%. Then,
Toxicity Characteristic Leaching Procedure
(TCLP) method was adopted to measure the
leaching concentrations of solidified heavy metal
ions, and to examine the impact of admixtures on
MKPC solidified heavy metals. The results showed
that admixtures at the ratio of 30% would reduce
the strength of solidified heavy metals by
approximately 70%, while extension of
conservation time would improve the strength so as
to meet the requirements of landfill processing.
After conserving the samples containing 30% of
admixtures for 28d, the ion concentration of Zn,
Cu and Pb detected by TCLP method were lower
than the TCLP standard regulated by the US
Environmental Protection Agency (EPA). It shows
that MKPC can be mixed with an appropriate
amount of admixtures and conserved for a certain
period of time before heavy metal
solidification/stabilization.
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