The invention belongs to the technical field of in-situ leaching
uranium mining, and particularly relates to a using method of an organic
chlorine oxidant in neutral in-situ leaching
uranium mining.
Carbon dioxide and
oxygen are injected into
groundwater to prepare a leaching agent, and the pH value of the leaching agent is controlled to be 6.8-7.5; the concentration of the leach liquor
uranium does not increase any more when reaching a
peak value, and the
oxygen stops being added;
sodium dichloroisocyanurate is added as an oxidant, the prepared
sodium dichloroisocyanurate solution is added into a
liquid injection main
pipe through a
metering pump, and the
mass concentration is 200-300 mg / L; the free
chlorine concentration of a leach liquor is monitored, and when the free
chlorine concentration is greater than 20 mg / L, the
mass concentration of the oxidant
sodium dichloroisocyanurate is reduced to 30-40% of the original concentration, namely, 60-120 mg / L; when the
leaching rate of a block section is greater than 70%, the oxidant stops being added until the leaching process is finished. The using method can overcome the defect that the neutral leaching
uranium mining adopts the
oxygen as the oxidant, the tetravalent uranium in the ore is effectively oxidized, the concentration of the leach liquor uranium is improved, and the leaching period of the ore is shortened