Method for treating alkali wastewater containing uranium

A waste water treatment, alkaline technology, applied in the removal of radium, uranium in the alkaline uranium-containing wastewater of uranium mines, can solve the problems of poor radium removal effect, difficulty in reaching the maximum allowable limit of waste water discharge, etc., to achieve easy disposal, mining area The effect of environmental quality improvement and environmental pollution containment

Active Publication Date: 2012-06-13
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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AI Technical Summary

Problems solved by technology

CO in alkaline uranium-containing wastewater 3 2- and Cl - Coexistence, the existing technology is poor in removing uranium and radium, and it is difficult to reach the maximum allowable limit of wastewater discharge: uranium 0.3mg / L, radium 1.1Bq / L

Method used

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  • Method for treating alkali wastewater containing uranium
  • Method for treating alkali wastewater containing uranium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Composition U of alkaline wastewater from a uranium mine: 3.91mg·L -1 ;CO 3 2- : 4.54g·L -1 ; HCO 3 - : 2.32g·L -1 ; Ra: 18.2Bq L -1 ;Cl - : 7.54g·L -1 ; Ca: 0.006g·L -1 ; Mg: 0.034g L -1 .

[0022] The above-mentioned alkaline uranium-containing wastewater treatment method comprises the steps of:

[0023] (a) Alkalization:

[0024] Adding Ca(OH) to alkaline uranium-containing wastewater 2 , the Ca(OH) 2 Made by digesting quicklime with water. Ca(OH) 2 with CO 3 2- and HCO 3 - reaction to generate CaCO 3 precipitation. Ca(OH) 2 The molar amount added is the amount of CO in alkaline uranium-containing wastewater 3 2- and HCO 3 - 1.1 times of the sum of moles, the reaction temperature is 25°C, and the reaction time is 1 hour. Ca(OH) 2 The amount added makes the CO in the alkaline uranium-containing wastewater 3 2- and HCO 3 - Concentration drops below 0.1mg / L;

[0025] (b) Neutralize:

[0026] Filtrating the alkaline uranium-containing wa...

Embodiment 2

[0033] Composition U of alkaline wastewater from a uranium mine: 0.70mg·L -1 ;CO 3 2- : 5.10g·L -1 ; HCO 3 - : 1.56g·L -1 ; Ra: 15.2Bq L -1 ;Cl - : 3.92g·L -1 ; Ca: 0.010g·L -1 ; Mg: 0.042g L -1 .

[0034] The above-mentioned alkaline uranium-containing wastewater treatment method comprises the steps of:

[0035] (a) Alkalization:

[0036] Adding Ca(OH) to alkaline uranium-containing wastewater 2 , the Ca(OH) 2 Made by digesting quicklime with water. Ca(OH) 2 with CO 3 2- and HCO 3 - reaction to generate CaCO 3 Precipitation, Ca(OH) 2 The amount added makes the CO in the alkaline uranium-containing wastewater 3 2- and HCO 3 - Concentration drops below 0.1mg / L;

[0037] Ca(OH) 2 The molar amount added is the amount of CO in alkaline uranium-containing wastewater 3 2- and HCO 3 - 1.1 times of the sum of moles, the reaction temperature is 25°C, and the reaction time is 1 hour.

[0038] (b) Neutralize:

[0039] Filtrating the alkaline uranium-conta...

Embodiment 3

[0046] Composition U of alkaline wastewater from a uranium mine: 9.49mg·L -1 ;CO 3 2- : 11.6g·L -1 ; Ra: 34.5Bq L -1 ;Cl - : 16.24g·L -1 ;Ca-1 ;Mg-1 .

[0047] The above-mentioned alkaline uranium-containing wastewater treatment method comprises the steps of:

[0048] (a) Alkalization:

[0049] Adding Ca(OH) to alkaline uranium-containing wastewater 2 , Ca(OH) 2 with CO 3 2- and HCO 3 - reaction to generate CaCO 3 Precipitation, Ca(OH) 2 The amount added makes the CO in the alkaline uranium-containing wastewater 3 2- and HCO 3 - Concentration drops below 0.1mg / L;

[0050] Ca(OH) 2 The molar amount added is the amount of CO in alkaline uranium-containing wastewater 3 2- and HCO 3 - 1.1 times of the sum of moles, the reaction temperature is 25°C, and the reaction time is 1 hour.

[0051] (b) Neutralize:

[0052] Filtrating the alkaline uranium-containing wastewater obtained in step (a) to obtain a filtrate and a filter residue; then adding FeSO to the f...

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Abstract

The invention provides a method for treating alkali wastewater containing uranium, which comprises the following steps: (a) adding Ca(OH)2 into the alkali wastewater containing uranium and enabling concentration of CO32- and HCO3- in the alkali wastewater containing uranium to be reduced be less than 0.1mg/L, (b) filtering obtained the alkali wastewater containing uranium in the step (a), adding FeSO4 into filtrate and adjusting potential of hydrogen (pH) value in a range of 7.0-9.0, (c) adding BaCl2 into obtained alkali liquid containing uranium in the step (b) to performing coprecipitation and radium removing, and (d) aging obtained alkali liquid containing uranium in the step (c), performing the step (b) to aged alkali liquid containing uranium, and performing neutralization reaction together with the filtrate. After 5-10 times of cycling aging, finally-obtained alkali liquid containing uranium is filtered to obtain filtrate and filter residues. By means of the method, uranium content in wastewater can be reduced to be less than 0.05 mg/L, radium content can be reduced to be less than 1.1 Bq/L, standard wastewater discharge can be completely achieved, and residues are small in quantity and easy to dispose.

Description

technical field [0001] The invention relates to the field of hydrometallurgy of uranium mines, in particular to a method for removing 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 向秋林刘忠臣秦德恩刘会武李建华张宝恩
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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