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A kind of preparation method of basic iron-loaded mixed ash adsorbent

An adsorbent, base iron technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problem of insufficient selective adsorption of cobalt ions, sensitive to pH value of waste liquid, prominent secondary pollution, etc. problems, to achieve the effect of expanding the pH range, low chemical loss, high selective adsorption and acid resistance

Active Publication Date: 2021-03-19
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing ion exchange materials also have disadvantages, such as sensitivity to the pH value of waste liquid, insufficient selective adsorption of strontium, cesium, and cobalt ions, prominent secondary pollution, and expensive materials for removing cesium ions.

Method used

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  • A kind of preparation method of basic iron-loaded mixed ash adsorbent
  • A kind of preparation method of basic iron-loaded mixed ash adsorbent
  • A kind of preparation method of basic iron-loaded mixed ash adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The effect of different molar ratios of Fe(II) and Fe(III) on the removal rate of strontium, cesium and cobalt ions in water:

[0027] Such as figure 1 Shown, is the preparation process of iron-loaded mixed ash slag adsorbent, specifically:

[0028] Preparation of mixed iron-based solution: according to the molar ratio of ferrous iron (Fe(II)) to ferric iron (Fe(III)) 2:1, 2.5:1, 3:1, 3.5:1, 4:1, respectively weigh Take ferrous sulfate and ferric sulfate, then mix them into distilled water at the same time, and stir until they are completely dissolved in a sealed state to obtain a mixed iron-based solution per unit volume with a total molar concentration of Fe(II) and Fe(III) of 0.5moL / L.

[0029] Preparation of mixed ash powder: Weigh fly ash and blast furnace slag after ball mill high-speed grinding for 1 hour according to the mass ratio of 6:4, mix and manually stir for 5 minutes to obtain mixed ash powder.

[0030] Preparation of iron-loaded mixed ash slurry: Mix ...

Embodiment 2

[0039] Effects of different mass ratios of fly ash and blast furnace slag on the removal rate of strontium, cesium and cobalt ions in water:

[0040] Preparation process is with embodiment 1, and embodiment 1 difference is:

[0041] Preparation of mixed iron-based solution: the molar ratio of Fe(II) to Fe(III) is 3.5:1, and a mixed iron-based solution per unit volume with a total molar concentration of Fe(II) and Fe(III) of 1moL / L is prepared.

[0042] Preparation of mixed ash powder: according to the mass ratio of 6:4, 7:3, 8:2, and 9:1, respectively weigh fly ash and blast furnace slag after ball mill high-speed grinding for 2 hours, mix them, and manually stir them for 7.5 minutes to obtain a mixture Ash powder.

[0043] Preparation of iron-loaded mixed ash slurry: Mix the mixed iron-based solution and mixed ash powder according to the liquid-solid ratio of 1mL:1g, and stir at 40rpm for 20min in a sealed state to obtain the iron-loaded mixed ash slurry.

[0044] Preparati...

Embodiment 3

[0051] Oh - The effect of different molar ratios with Fe(II)+Fe(III) on the removal rate of strontium, cesium and cobalt ions in water:

[0052] Preparation process is with embodiment 1, and embodiment 1 difference is:

[0053] Preparation of mixed iron-based solution: the molar ratio of Fe(II) to Fe(III) was 3.5:1, and a mixed iron-based solution per unit volume with a total molar concentration of Fe(II) and Fe(III) of 1.5moL / L was prepared.

[0054] Preparation of mixed ash powder: Weigh fly ash and blast furnace slag after ball mill high-speed grinding for 3 hours according to the mass ratio of 9:1, mix and manually stir for 10 minutes to obtain mixed ash powder.

[0055] Preparation of iron-loaded mixed ash slurry: Mix the mixed iron-based solution and mixed ash powder according to the liquid-solid ratio of 1.25mL:1g, and stir at 50rpm for 30min in a sealed state to obtain the iron-loaded mixed ash slurry.

[0056] Preparation of basic caustic lye: according to OH - Wei...

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Abstract

The invention discloses a preparation method for a base iron-loaded mixed ash adsorbent. The preparation method for the base iron-loaded mixed ash adsorbent comprises the steps of (1) weighing ferroussulfate and ferric sulfate, dissolving the ferrous sulfate and the ferric sulfate in water, sealing and stirring the ferrous sulfate and the ferric sulfate to prepare a mixed iron-base solution; (2)weighing coal ash and ground blast furnace slag, mixing and stirring the coal ash and the ground blast furnace slag to prepare a mixed ash powder; (3) mixing and stirring the mixed iron-base solutionand the mixed ash powder to prepare iron-loaded mixed ash slurry; (4) weighing sodium hydroxide and sodium carbonate in water, and sealing and stirring the sodium hydroxide and the sodium carbonate toprepare basic caustic liquor; and (5) mixing the iron-loaded mixed ash slurry and the basic caustic liquor, sealing and stirring the iron-loaded mixed ash slurry and the basic caustic liquor, dryingthe iron-loaded mixed ash slurry and the basic caustic liquor in a vacuum state, and grinding the iron-loaded mixed ash slurry and the basic caustic liquor to obtain the base iron-loaded mixed ash adsorbent. The preparation method for the base iron-loaded mixed ash adsorbent, disclosed by the invention, has the advantages that the method is simple, raw materials are cheap, the adsorbent preparation cost is low, the prepared adsorbent realizes high selective adsorption and high stability, and strontium, caesium and cobalt ions in radioactive waste water with pH value of 4-13 can be simultaneously removed.

Description

technical field [0001] The invention relates to the treatment of radioactive waste water in nuclear power generation, in particular to a preparation method of a basic iron-loaded mixed ash adsorbent. Background technique [0002] The production of nuclear fuel and the operation of nuclear power plants will produce a large amount of radioactive wastewater, and the safe treatment of radioactive wastewater has become a key issue in the development of nuclear energy. In the Fukushima nuclear accident in Japan, strontium 137 Cs, Cesium 90 Sr, cobalt 60 The three radionuclides of Co have the highest probability of being detected. Due to their strong radioactivity, long half-life, and high biological and chemical toxicity, these three radioactive elements pose great harm to humans and the ecological environment. At present, the methods for treating radioactive wastewater mainly include concentration method, chemical precipitation method, co-precipitation method, physical adsorpt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02B01J20/30C02F1/28G21F9/12
CPCB01J20/0229B01J20/041C02F1/281G21F9/12
Inventor 黄涛宋东平史康平刘龙飞张树文周璐璐
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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