Calcium-based adsorbent for defluorination and application thereof

A technology of calcium-based adsorbent and calcined product, applied in adsorption water/sewage treatment, other chemical processes, inorganic chemistry, etc., can solve the problems of low efficiency, secondary pollution, poor fluorine-containing wastewater treatment effect, etc., and achieve adsorption efficiency High, low price, better fluorine removal efficiency

Active Publication Date: 2016-06-15
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems of poor fluorine-containing wastewater treatment effect, low efficiency, and easy introduction of secondary pollution in the prior art, the present invention provides a calcium-based adsorbent for fluoride removal and its application

Method used

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  • Calcium-based adsorbent for defluorination and application thereof
  • Calcium-based adsorbent for defluorination and application thereof
  • Calcium-based adsorbent for defluorination and application thereof

Examples

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Effect test

Embodiment 1

[0041] Take simulated sodium fluoride wastewater, the fluorine concentration is 20mg / L.

[0042] A calcium-based adsorbent for defluoridation of the present embodiment and its application, the steps are:

[0043] (1) Synthesize the dolomite powder calcined product and fly ash at a weight ratio of 1.0 to 2.75:1 at a synthesis temperature of 170°C to 200°C for 6 hours to obtain a calcium-based adsorbent;

[0044] (2) Then add calcium-based adsorbent to the sodium fluoride wastewater, the dosage is 5g / L, magnetically stir for 30min, and separate the solid and water after precipitation.

[0045] Such as figure 1As shown, the defluoridation effect under different synthesis temperature and different dolomite: fly ash weight ratio conditions. It can be seen from the figure that under the condition of not adjusting the pH, as the synthesis temperature increases, the fluorine removal efficiency of the calcium-based adsorbent increases first and then decreases, while the change trend ...

Embodiment 2

[0048] The application of a calcium-based adsorbent for defluoridation of this embodiment in the treatment of semiconductor wastewater:

[0049] Take simulated semiconductor wastewater, the fluorine concentration is 20mg / L.

[0050] A calcium-based adsorbent for defluoridation of the present embodiment and its application, the steps are:

[0051] (1) Take the calcined product of dolomite powder and fly ash with a weight ratio of 1.5:1 to synthesize, the synthesis temperature is 180°C, and the time is 6h to obtain a calcium-based adsorbent;

[0052] (2) Adjust the pH value of the wastewater to 2-11, then add calcium-based adsorbent to the wastewater at a dosage of 1.25g / L, stir magnetically for 10min, and separate the solid and water after centrifugation.

[0053] Such as image 3 Shown, the defluoridation effect of calcium-based adsorbent under different pH conditions. It can be seen from the figure that the calcium-based adsorbent can achieve a fluoride removal efficiency ...

Embodiment 3

[0055] The application of a calcium-based adsorbent for defluoridation in this embodiment in the treatment of fluorine product production wastewater:

[0056] Take the simulated fluorine product production wastewater, the fluorine concentration is 20mg / L.

[0057] A calcium-based adsorbent for defluoridation of the present embodiment and its application, the steps are:

[0058] (1) Take the calcined product of dolomite powder and fly ash with a weight ratio of 1.5:1 to synthesize, the synthesis temperature is 190° C., and the time is 6 hours to obtain a calcium-based adsorbent;

[0059] (2) Add calcium-based adsorbent to the waste water, the dosage is 1.25-25g / L, magnetically stir for 20min, centrifuge and separate the solid and water.

[0060] Such as Figure 4 As shown, the defluorination effect of the synthetic product under different dosage conditions: as can be seen from the figure, (without adjusting the pH value), when the dosage is 1.25g / L, the removal efficiency of ...

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Abstract

The invention discloses a calcium-based adsorbent for defluorination and an application thereof and belongs to the field of wastewater treatment. Dolomite and coal ash are taken as raw materials and are compounded into the calcium-based adsorbent for defluorination, provided by the invention, according to a hydrothermal method. The application steps are as follows: (1) compounding calcined products of dolomite dust with the coal ash at the compounding temperature of 170-200 DEG C for 6h, so as to obtain the calcium-based adsorbent; and (2) adding the calcium-based adsorbent into wastewater at the dosage of 1.25-25g/L, magnetically stirring for 10min-30min, precipitating or centrifuging, and then separating solid from water. The calcium-based adsorbent for defluorination can effectively absorb fluorine pollutants under a low pH condition, and has physical and chemical absorption effects. The effluent meets GB8978-1996 class-1 emission standard.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a calcium-based adsorbent for fluoride removal and its application. The adsorbent has low synthesis cost, simple operation, low treatment cost, can be popularized and applied in engineering, and is suitable for the treatment of semiconductor wastewater and the production of fluorine products. Wastewater, pesticide wastewater, stainless steel pickling wastewater. Background technique [0002] Fluorine is one of the essential trace elements for the human body. However, when the daily intake of fluorine exceeds 1 mg, it will cause diseases such as the liver, kidneys, cardiovascular system, and immune system. The concentration of fluorine in the sanitary standards for drinking water promulgated by my country (GB5479-2006) is ≤1mg / L, while the primary discharge concentration of fluorine in industrial wastewater in the comprehensive sewage discharge standard (GB8978-1996) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/14
CPCB01J20/043B01J20/103B01J2220/42B01J2220/4806C02F1/281C02F2101/14
Inventor 余荣台马湘谢志鹏汪长安
Owner JINGDEZHEN CERAMIC INSTITUTE
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