INSOLUBILIZING AGENT

摘要

An insolubilizing agent which can sufficiently inhibit, even when added in a small amount, heavy metals and so on from being leached from heavily contaminated soil or wastewater.  The insolubilizing agent contains a partial hydrate of soft-burned magnesia, said partial hydrate being prepared by subjecting a soft-burned magnesia obtained by burning a mineral comprising magnesium carbonate and/or magnesium hydroxide as the main component at 550 to 1,400°C to partial hydration.  The content of magnesium oxide in the partial hydrate of soft-burned magnesia is 50 to 96.5mass%, the content of magnesium hydroxide therein is 3.5 to 50mass%, and the content of calcium therein is 5.0mass% or lower in terms of oxide.