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Al2O3-Tob/HA compound sewage treatment material, and preparation method and application thereof

An al2o3-tob and sewage treatment technology, applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., to achieve the effect of simple production process, low production cost and high purity

Active Publication Date: 2015-02-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, if fly ash is used in large quantities as a construction material, it is really a low-end application with low value

Method used

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  • Al2O3-Tob/HA compound sewage treatment material, and preparation method and application thereof
  • Al2O3-Tob/HA compound sewage treatment material, and preparation method and application thereof
  • Al2O3-Tob/HA compound sewage treatment material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1) Add dilute hydrochloric acid with a mass concentration of 2.5% to the fly ash at a liquid-solid ratio of 6mL / 1g, heat and stir at 80°C for 2 hours for acid leaching to remove soluble impurities and some Al 2 o 3 . After acid leaching, filter, wash and dry to obtain pickled fly ash powder;

[0046] 2) Determination of SiO in pickling fly ash powder 2 and Al 2 o 3 content. Al was designed according to the molar ratio of aluminum-substituted tobernetite / HA to be 8:2. 2 o 3 -Compound ratio of Tob and HA. Determine the molar amount of Si according to the ratio of molar ratio nCa / nSi=5 / 6, and then determine the molar amount of Ca in the aluminum-substituted tobermorite; then determine the molar amount of P according to the ratio of molar ratio nCa / nP=5:3 amount, and then determine the molar amount of Ca in HA; finally determine the total molar amount of Ca introduced.

[0047]3) Weigh the amount of pickling fly ash and analytically pure Ca(OH) according to the det...

Embodiment 2

[0054] 1) Add dilute hydrochloric acid with a mass concentration of 2.5% to the fly ash at a liquid-solid ratio of 5mL / 1g, heat and stir at 80°C for 3 hours for acid leaching to remove soluble impurities and some Al 2 o 3 . After acid leaching, filter, wash and dry to obtain pickled fly ash powder;

[0055] 2) Determination of SiO in pickling fly ash powder 2 and Al 2 o 3 content. Al was designed according to the molar ratio of aluminum-substituted tobernetite / HA to be 7:3. 2 o 3 -Compound ratio of Tob and HA. Determine the molar amount of Si according to the ratio of molar ratio nCa / nSi=5 / 6, and then determine the molar amount of Ca in the aluminum-substituted tobermorite; then determine the molar amount of P according to the ratio of molar ratio nCa / nP=5:3 amount, and then determine the molar amount of Ca in HA; finally determine the total molar amount of Ca introduced.

[0056] 3) Weigh the amount of pickling fly ash and analytically pure Ca(OH) according to the de...

Embodiment 3

[0063] 1) Add dilute hydrochloric acid with a mass concentration of 2.5% to the fly ash at a liquid-solid ratio of 5.5mL / 1g, heat and stir at a constant temperature of 80°C for 2.5h for acid leaching to remove soluble impurities and some Al 2 o 3 . After acid leaching, filter, wash and dry to obtain pickled fly ash powder;

[0064] 2) Determination of SiO in pickling fly ash powder 2 and Al 2 o 3 content. Al was designed according to the molar ratio of aluminum-substituted tobernetite / HA to be 6:4. 2 o 3 -Compound ratio of Tob and HA. Determine the molar amount of Si according to the ratio of molar ratio nCa / nSi=5 / 6, and then determine the molar amount of Ca in the aluminum-substituted tobermorite; then determine the molar amount of P according to the ratio of molar ratio nCa / nP=5:3 amount, and then determine the molar amount of Ca in HA; finally determine the total molar amount of Ca introduced.

[0065] 3) Weigh the amount of pickling fly ash and analytically pure C...

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Abstract

The invention discloses an Al2O3-Tob / HA compound sewage treatment material, and a preparation method and application thereof. The preparation method comprises the following steps: using pre-pickling pulverized fuel ash as a silicon source and an aluminium source, using slaked lime Ca(OH)2 as a symbiotic calcium source and using phosphoric acid as a phosphorus source; at first, adopting a sonochemistry method, and controlling the temperature and regulating the pH value to 10.5 to 11.5 to prepare an aluminum substituted tobermorite performed polymer; then adding a phosphoric acid solution to obtain an Al2O3-Tob and HA symbiotic co-polymer; finally adopting a hydrothermal vapor pressure method to prepare an Al2O3-Tob / HA compound sewage treatment material of which the compound ratio X is 2 to 4. Test results show that the product impurity phases are few, the purity is high, Al2O3-Tob and HA crystallization conditions are favorable, and the product has a net framework structure, large specific surface area, and a strong property for adsorbing and desorbing heavy metal ion Cd<2+>, and the adsorbing property is enhanced along with the increase of the compound ratio in an experimental scale. The production process is simple, the operation process is convenient, the production cost is low, and the preparation method is a practical and effective method for using pulverized fuel ash solid wastes.

Description

technical field [0001] The invention belongs to the field of eco-environmental materials, in particular to an Al 2 o 3 -Tob / HA composite sewage treatment material and its preparation method and application. Background technique [0002] With the gradual growth of my country's population, the acceleration of urbanization and the rapid development of industry and agriculture, the discharge of domestic wastewater and industrial wastewater has shown a significant growth trend, with an average annual discharge of nearly 1 billion tons more, with a growth rate of about 7%. However, the construction of corresponding wastewater treatment facilities is seriously lagging behind, resulting in more than 80% of these wastewaters being discharged directly into water bodies without any treatment, causing serious water pollution. Heavy metal ions are one of the main pollutants of water pollution, and they are important factors that reduce water quality and endanger the water environment ec...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/30B01J39/14C02F1/42C02F1/28C02F1/62
CPCB01J20/10B01J20/3085B01J39/14B01J2220/4806C02F1/281C02F1/42C02F1/62
Inventor 张超武缪金良宋大龙张利娜王芬刘潇
Owner SHAANXI UNIV OF SCI & TECH
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