PURPOSE: To obtain the titled neutralizing agent having the excellent efficiency of neutralization without the need of mechanical agitation, by forming a mixture comprising a calcium neutralizing agent and a salt composed of an atom or an atomic group other than Ca or SO4.
CONSTITUTION: The mixture comprising a Ca neutralizing agent (e.g. slaked lime or calcium carbonate) and a salt (e.g. NaCl) composed of an atom or an atomic group other than Ca or SO4 is formed in the presence or absence of a binder (e.g. cement) to obtain the neutralizing agent. This neutralizing agent is esp. suitable for neutralizing sulfuric acid water flowing out of an unmanned unworked or abolished mine, etc. difficult to receive an electric power source. By the presence of said neutralizing agent in the outflow sulfuric acid water, neutralization can be unmannedly realized with high efficiency for over a long time without the need to use driving power, even if mechanical agitation is not completely performed. Thus, the prevention of environmental pollution can be effectively realized while saving installation, labor and driving power.
ITOU YOSHIYA
HARADA HIROYUKI
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