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Rapid treating method for rare earth radioactive wastewater

A radioactive wastewater and rare earth technology, which is applied in the rapid treatment of rare earth radioactive wastewater, uranium radioactive wastewater, and thorium-containing fields, can solve the problems of low removal rate, easy generation of dirt, short service life, etc., and achieve good application prospects and strong adsorption capacity Effect

Active Publication Date: 2016-08-31
CHANGSHA SCI ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the obvious shortcomings of traditional physical and chemical methods, such as high cost, unstable operation, difficulty in reaching water standards, easy generation of fouling and short service life in new technology membrane separation, and existing composite methods are used to remove them by single composite method. Radioactive elements in wastewater, and the removal rate is not high, a method for the rapid treatment of rare earth radioactive wastewater with a compound deuranium agent is proposed, and its activity concentration ranges from 37 to 3.7×10 5 Bq / L, the main radioactive elements contained are uranium, thorium and heavy metals and other pollutants

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Examples

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Effect test

Embodiment 1

[0030] Preparation of composite deuranium agent:

[0031] a, the polyferric sulfate (Fe 2 (OH)n(SO 4 ) 3～n / 2 ) m , ferric chloride (FeCl 3 ·6H 2 O), ferrous nitrate (Fe(NO 3 ) 2 ·6H 2 O), ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O), ferrous perchlorate (Fe(ClO 4 ) 2 ), potassium ferrate (K 2 FeO 4 ), polyaluminum sulfate [Al 2 (OH)m(SO 4 ) 3- ] n , aluminum sulfate (Al 2 (SO 4 ) 3 ), aluminum chloride (AlCl 3 ) one or more dissolved, the mass fraction is controlled at 30-40%, the temperature is controlled at 20-40°C, and the reaction is stirred for 2 hours;

[0032] b. Obtaining the product according to step a and adding 2 to 5% hydrogen peroxide (27% by mass) and 1 to 5% concentrated sulfuric acid (50% by mass), reacted for 2 to 4 hours. The supernatant is the composite deuranium agent.

Embodiment 2

[0034] The radioactive wastewater discharged by a rare earth processing enterprise contains uranium concentration of 3.24mg / L, COD of 445mg / L, and pH value of 10.4. Dilute sulfuric acid is added to the wastewater for pretreatment, and the pH is adjusted to about 3.0, according to 1.2kg / m 3 Add the compound deuranizing agent in an appropriate amount, stir and react for 10 minutes, according to 1.0kg / m 3Add oxidant, oxidize for 20 minutes, then add sodium hydroxide solution to adjust to pH = 9.0, react for 15 minutes, let stand for 10 minutes, take supernatant to analyze and detect uranium, the concentration of uranium in the test water is <0.087mg / L, lower than the discharge limit of 0.1 mg / L for the total amount of thorium and uranium in the "Discharge Standards for Rare Earth Industrial Pollutants" (GB26451-2011).

Embodiment 3

[0036] Take 10L of radioactive wastewater, the concentration of thorium in the wastewater is 0.8mg / L, the concentration of uranium is 2.1mg / L, pH 7.3, COD 322.4mg / L, add 1.0L of compound deuranium agent to the wastewater and react for 10min, then add 10mL of oxidant Carry out oxidation reaction 20min, then add Ca(OH) 2 The solution was adjusted to pH=9.0, and the reaction time was 10 minutes, then 2 mL of flocculant PAM (mass fraction 0.1%) was added, stirred for 1 minute, and left to stand for solid-liquid separation. The supernatant was taken for analysis and detection of thorium and uranium. After analysis and testing, the concentration of thorium in the effluent water is 0.01mg / L, the concentration of uranium is 0.005mg / L, and the total amount of thorium and uranium is 0.015mg / L, which is lower than the "Rare Earth Industrial Pollutant Discharge Standard" (GB26451~2011) Thorium and uranium total discharge limit of 0.1mg / L.

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Abstract

The invention discloses a rapid treating method for rare earth radioactive wastewater. The method comprises the steps that a compound uranium removing agent and an oxidizing agent are added into radioactive wastewater with the pH of 3-7, residual organic extraction agent in rare earth extraction wastewater is efficiently oxidized through the synergistic effect of the compound uranium removing agent and the oxidizing agent, the complexing state of the extraction agent and uranium is damaged, uranium is combined with the compound uranium removing agent to generate a stable compound so as to achieve removal, the compound uranium removing agent can form loose floc in wastewater, and the floc has the strong adsorption ability on residual other radioactive elements such as thorium in water, so that radioactive elements and heavy metal ions in water are rapidly removed, deep removal of radioactive elements is achieved, the drained out can stably reach the limiting value of emission standards of radioactive elements and heavy metal in Rare Earth Industrial Pollutant Emission Standards (GB26451-2011), a new path is developed for rapid deep treatment of radioactive wastewater, and the application prospect is quite good.

Description

Technical field: [0001] The invention relates to a method for rapid treatment of rare earth radioactive wastewater, in particular to a method for radioactive wastewater containing thorium and uranium produced in the rare earth industry, and belongs to the technical field of radioactive wastewater treatment. Background technique: [0002] my country's rare earth industry has been established in the early 1960s and has made brilliant achievements after more than 50 years of development. It has now become the world's largest producer, consumer and exporter of rare earth products. With the research on the development and application of rare earths, traditional or high-tech rare earth products are used in many fields of the national economy, but in the rare earth smelting and production process, the "three wastes" and rare earth associated radionuclides thorium and uranium are seriously polluted. If these radioactive waste liquid If it cannot be treated effectively in a timely ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/52C02F1/66C02F1/72C02F9/00C02F2101/20
Inventor 张力萍陈润华谭琴赵淑红高伟荣傅耘力闫国孟
Owner CHANGSHA SCI ENVIRONMENTAL TECH
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