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Neutralization method for treating alkali wastewater containing uranium

A wastewater treatment, alkaline technology, applied in water/sewage treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problem of not reaching deep uranium removal, poor co-precipitated radium effect, poor wastewater treatment effect, etc. question

Active Publication Date: 2012-06-13
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since sulfuric acid is a strong acid, sulfuric acid is used for direct neutralization to redissolve the resulting precipitate; in addition, the metal ions are not added, and the effect of co-precipitating radium in the precipitate is poor, and the purpose of deep removal of uranium is not achieved, resulting in the effect of wastewater treatment bad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Composition U of alkaline wastewater from a uranium mine: 0.97mg·L -1 ;OH - : 3.4g·L -1 ; Cl - : 7.54g·L -1 ; Ra: 18.2Bq L -1 ; Ca: 4.15g L -1 ; Mg: 0.034g L -1 .

[0018] A kind of neutralization method for the treatment of alkaline uranium-containing wastewater according to the present invention:

[0019] (1) Add FeSO to the above-mentioned alkaline uranium-containing wastewater by air stirring 4 Neutralize OH in wastewater - , FeSO 4 ·7H 2 O dosage 5kg m -3 , adjust the pH value of wastewater at 8, the reaction temperature is 25°C, and the reaction time is 2h; Fe 2+ Under the action of air, it is oxidized and hydrolyzed to form Fe(OH) 3 Precipitation, Fe(OH) 3 Precipitation is positively charged to adsorb uranium ions;

[0020] (2) When the pH value is 8.0, add Na 2 SO 4 Supplement SO 4 2- , so that SO 4 2- The concentration is 1.7g·L -1 ; then add BaCl 2 Radium removal, co-precipitation to generate Ba(Ra)SO 4 , BaCl 2 The amount added is con...

Embodiment 2

[0023] Composition U of alkaline wastewater from a uranium mine: 0.13mg·L -1 ;OH - : 4.0g·L -1 ; Ra: 15.2Bq L -1 ; Cl - : 3.92g·L -1 ; Ca: 4.30g·L -1 ; Mg: 0.042g L -1 ; pH 13.

[0024] A kind of neutralization method for the treatment of alkaline uranium-containing wastewater according to the present invention:

[0025] (1) Add FeSO to the above-mentioned alkaline uranium-containing wastewater by air stirring 4 Neutralize OH in wastewater - , FeSO 4 The molar amount added is OH in alkaline uranium-containing wastewater - 2 / 3 of the molar weight, the reaction temperature is 30°C, and the reaction time is 1h; Fe 2+ Under the action of air, it is oxidized and hydrolyzed to form Fe(OH) 3 Precipitation, Fe(OH) 3 Precipitation is positively charged to adsorb uranium ions;

[0026] (2) When the pH value is 9, add Na 2 SO 4 Supplement SO 4 2- , so that SO 4 2- The concentration is 2.0g·L -1 ; then add BaCl 2 Radium removal, co-precipitation to generate Ba(Ra)SO ...

Embodiment 3

[0029] Composition U of alkaline wastewater from a uranium mine: 1.64mg·L -1 ;OH - : 2.0g·L -1 ; Ra: 34.5Bq L -1 ; Cl- : 16.24g·L -1 ; Ca: 8.51g L -1 ;Mg-1 ; pH 12.

[0030] A neutralization method for the treatment of alkaline uranium-containing wastewater according to the present invention:

[0031] (1) Add FeSO to the above-mentioned alkaline uranium-containing wastewater 4 Neutralize OH in wastewater - , FeSO 4 The molar amount added is OH in alkaline uranium-containing wastewater - 1 / 3 of the molar weight, the reaction temperature is 20°C, the reaction time is 3h; Fe 2+ Under the action of air, it is oxidized and hydrolyzed to form Fe(OH) 3 Precipitation, Fe(OH) 3 Precipitation is positively charged to adsorb uranium ions;

[0032] (2) When the pH value is 7, add Na 2 SO 4 Supplement SO 4 2- , so that SO 4 2- The concentration is 1.0g·L -1 ; then add BaCl 2 Radium removal, co-precipitation to generate Ba(Ra)SO 4 , BaCl 2 The amount added is controlle...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66C02F1/28C02F1/52C02F1/58C02F1/62C02F101/10
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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