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Method for removing fluorine in acid uranium process wastewater

A process and acidic technology, which is applied in the field of fluorine removal in acid uranium process wastewater, can solve the problems such as difficult removal of fluorine ions, and achieve the effects of fast settling speed, saving reagents and easy operation

Inactive 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

These impurity elements and the target element uranium are leached together in the acid leaching process. After ion exchange or solvent extraction of uranium, these impurity elements or ions exist in the acid uranium process wastewater, and are carried by neutralization method and barium chloride precipitation. The belt method can remove most heavy metal ions of radionuclides uranium, thorium and radium, but it is difficult to remove fluoride ions to meet the requirements of industrial wastewater discharge standards (fluorine ion concentration ≤ 10mg / L, "Comprehensive Wastewater Discharge Standard" GB8978-1996)

Method used

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  • Method for removing fluorine in acid uranium process wastewater
  • Method for removing fluorine in acid uranium process wastewater
  • Method for removing fluorine in acid uranium process wastewater

Examples

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Effect test

Embodiment 1

[0029] The acidic uranium process wastewater in the examples comes from the acidic industrial production wastewater of a uranium mine, and the analysis results of its composition are shown in the following table.

[0030] Table 1 Wastewater Composition mg / L

[0031]

[0032] *Note: Radium activity unit: Bq / L

[0033] Such as figure 1 Shown, the removal method of fluorine in a kind of acid uranium process wastewater of the present invention, it comprises the steps:

[0034] (1) Add milk of lime Ca(OH) to acid uranium process wastewater 2 Neutralize the solution so that the pH of the solution is controlled at 7.5;

[0035] (2) sulfate radical concentration ρ(SO in the solution of step (1) gained 2- 4 )≥250mg / l, add BaCl 2 In addition to radium, add a fluorine removal reagent to remove fluorine, and then stir and react at 25°C for 45 minutes; the BaCl 2 The added mass is 10mg BaCl per liter of solution 2 The added quality of the defluorination reagent is 60 times of th...

Embodiment 2

[0044] The acidic uranium process wastewater in the examples comes from a certain uranium ore hydrometallurgy process wastewater, and its composition analysis results are shown in the table below.

[0045] Table 2 Wastewater Composition mg / l

[0046]

[0047]

[0048] *Note: Radium activity unit: Bq / l

[0049] A method for removing fluorine in acidic uranium process wastewater according to the present invention comprises the steps of:

[0050] (1) Add 15wt% Ca(OH) to acid uranium process wastewater 2 Neutralize the solution so that the pH of the solution is controlled at 8;

[0051] (2) sulfate radical concentration ρ(SO in the solution of step (1) gained 2- 4 )≥250mg / l, add BaCl 2 In addition to radium, add a fluoride removal reagent to remove fluorine, and then stir and react at 15°C for 30 minutes; the BaCl 2 The added quality is 20mg BaCl per liter of solution 2 The added quality of the defluorination reagent is 65 times of the mass concentration of fluorine i...

Embodiment 3

[0055] The acidic uranium process wastewater in the examples is derived from the uranium hydrometallurgy test process wastewater in a certain mine, and the analysis results of its composition are shown in the following table.

[0056] Table 3 Wastewater Composition mg / l

[0057]

[0058] *Note: Radium activity unit: Bq / l

[0059] A method for removing fluorine in acidic uranium process wastewater according to the present invention comprises the steps of:

[0060] (1) Add 10wt% Ca(OH) to acid uranium process wastewater 2 Neutralize the solution so that the pH of the solution is controlled at 7;

[0061] (2) solution sulfate radical concentration ρ(SO in step (1) gained 2- 4 ) ≥ 250mg / l add BaCl 2 In addition to radium, add a fluorine removal reagent to remove fluorine, and then stir and react at 5°C for 60 minutes; the BaCl 2 The added quality is 30mg BaCl per liter of solution 2 The addition quality of described fluorine removal reagent is 70 times of the mass concen...

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Abstract

The invention provides a method for removing fluorine in acid uranium process wastewater, which comprises the following steps: (1) adding Ca(OH)2 into the acid uranium process wastewater for neutralization, (2) adding BaCl2 to remove radium and adding a fluorine-removing reagent to remove fluorine under the condition of solution sulfate radical concentration rho (SO2-4) >= 250mg / l, (3) adding Ca(OH)2 for neutralization, and (4) performing solid-liquid separation to obtained solution. Cycling operation is performed to 40-60 wt% of obtained lower-portion underflow after the separation according to the step (3) for 10-20 times, and the rest of the underflow is stored in a tailing pond. Obtained upper-portion underflow after the separation is neutralized by concentrated sulphuric acid, and a potential of hydrogen (pH) value is approximately equal to 8, namely neutralized upper-portion underflow after the separation is industrial wastewater meeting discharge standards. By means of the method, radioactive nuclides including the uranium, thorium and the radium in the acid uranium process wastewater are removed, hazardous elements including the fluorine, manganese and other irons are removed effectively, and uranium industrial wastewater after treatment reaches the discharge standards. The method is simple and convenient to operate, saved in reagents, little in water content in residues and quick in sedimentation velocity.

Description

technical field [0001] The invention relates to uranium ore hydrometallurgy technology, in particular to a method for removing fluorine in acidic uranium process wastewater. Background technique [0002] In the process of uranium mining and hydrometallurgy, a large amount of waste water is produced. These production wastewaters not only contain radionuclides uranium, thorium, radium, etc., but also contain a large amount of non-radioactive elements mercury, cadmium, chromium, arsenic, copper, zinc, manganese, fluoride ions, and sulfate ions. Their composition is related to ore characteristics, mining methods and processing techniques. These elements and ions are very harmful to the environment even in very low concentrations. Therefore, the wastewater produced by the uranium industry must be treated in an appropriate way before it can be discharged into the natural environment. [0003] Due to the continuous enhancement of environmental awareness and the requirements of g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/14C02F101/20
Inventor 张建国吴旭红王亮
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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