Neutralization method for treating alkali wastewater containing uranium

Abstract

The invention provides a neutralization method for treating alkali wastewater containing uranium, which comprises the following steps: adding OH- in FeSO4 neutralized wastewater into the alkali wastewater containing uranium, wherein the molar weight of the added FeSO4 is 1 / 3-2 / 3 of that of the OH- in the alkali wastewater containing uranium, potential of hydrogen (pH) value of the wastewater is adjusted in a range of 7-9, the reaction temperature is 20-30 DEG C, and the reaction time is 1-3 hours; oxidizing and hydrolyzing Fe2+ under the action of air to produce Fe(OH)3 precipitation, wherein the Fe(OH)3 precipitation has positive electricity and can absorb uranium ions; 3 under the condition of ph 7-9, if the SO42- concentration is lowered than 1.0-2.0 grams per milliliter, adding Na2SO4to supplement SO42- and enable the SO42- concentration to be 1.0-2.0 grams per milliliter; and adding BaCl2 to remove radium and co-precipitate and produce Ba(Ra)SO4, wherein added BaCl2 quantity is controlled in a range of 0.02-0.06 gram per milliliter. The neutralization method is an important process in the treatment technology of the alkali wastewater containing uranium, and simultaneously achieves functions including neutralization, adsorption carrying for removing the uranium deeply, supplement of SO42- for removing the radium, inhibiting of precipitation re-dissolution, coprecipitation for removing the radium and the like.

Description

technical field

[0001] The invention relates to the field of hydrometallurgy of uranium mines, in particular to the removal of uranium and radium in alkaline uranium-containing wastewater of uranium mines. Background technique

[0002] Compared with acid leaching, alkaline leaching of uranium ore can selectively dissolve uranium in the ore, in which iron, aluminum, titanium, etc. are almost insoluble in carbonate solution, and only a small amount of molybdate, Silicates, vanadates, phosphates and certain metal carbonate complexes. The radionuclide thorium is practically insoluble in the alkaline leaching process, while radium dissolves 1.5 to 3%. The other radionuclides are apparently discarded into the tailings. Therefore, for uranium mines treated by alkaline method, the main pollutants of wastewater are radionuclide uranium and radium.

[0003] Judging from the proven uranium resources in my country, the proportion of alkaline ore resources reaches 30%. Alkaline (carbon...