Preparation method of roasted calcium-magnesium-aluminum-based LDHs and application of roasted calcium-magnesium-aluminum-based LDHs in phosphorus removal

A calcium-magnesium-aluminum-based, roasting technology, which is applied in chemical instruments and methods, aluminum compounds, and other chemical processes, can solve the problems of slow phosphorus removal process, high sludge treatment cost, and high moisture content, and achieve pollution problems, Significant social value and research value, good adsorption effect

Pending Publication Date: 2020-12-22
LIAONING TECHNICAL UNIVERSITY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chemical method is the initial and effective method to remove high-concentration phosphate, but sedimentation not only produces a large amount of sludge, but also has a high water content, subsequent dehydration is difficult, and the cost of sludge treatment is high
The biological method usually has a slow phosphorus removal process and a long cycle, and its operation is affected by many factors such as ambient temperature and raw water quality, and its stability is poor

Method used

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  • Preparation method of roasted calcium-magnesium-aluminum-based LDHs and application of roasted calcium-magnesium-aluminum-based LDHs in phosphorus removal
  • Preparation method of roasted calcium-magnesium-aluminum-based LDHs and application of roasted calcium-magnesium-aluminum-based LDHs in phosphorus removal
  • Preparation method of roasted calcium-magnesium-aluminum-based LDHs and application of roasted calcium-magnesium-aluminum-based LDHs in phosphorus removal

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preparation example Construction

[0028] The method for preparing calcined calcium-magnesium-aluminum-based LDHs provided in the embodiments of the present invention adopts a constant pH double titration co-precipitation method to prepare calcium-magnesium-aluminum-based LDHs. Specific process such as figure 1 , figure 2 shown, including the following steps:

[0029] (a) According to the divalent metal cation (Ca 2+ and Mg 2+ ) and trivalent metal cations (Al 3+ ) Calcium-magnesium-aluminum molar ratio 5:1:2 configuration mixed metal salt solution, wherein the calcium-magnesium-aluminum metal cations are respectively anhydrous CaCl 2 , MgCl 2 ·6H 2 O, Al(NO) 3 9H 2 O configuration, the precipitant uses 1mol / L NaOH solution;

[0030] (b) Add 250mL mixed metal salt solution and NaOH solution dropwise into a beaker filled with 200mL, 0.5mol / L NaCl solution, stir at a constant temperature within the set temperature range of 35°C-75°C, and control the stirring rate (from The initial 700r / min rises to 100...

Embodiment 1

[0033] The calcined calcium-magnesium-aluminum-based LDHs adsorbent is prepared according to the following steps:

[0034] (a) According to the divalent metal cation (Ca 2+and Mg 2+ ) and trivalent metal cations (Al 3+ ) Calcium-magnesium-aluminum molar ratio 5:1:2 configuration mixed metal salt solution, wherein the calcium-magnesium-aluminum metal cations are respectively anhydrous CaCl 2 , MgCl 2 ·6H 2 O, Al(NO) 3 9H 2 O configuration, the precipitant uses 1mol / L NaOH solution;

[0035] (b) Add 250mL mixed metal salt solution and NaOH solution dropwise into a beaker containing 200mL, 0.5mol / L NaCl solution, stir at a constant temperature at a set temperature of 65°C, and control the stirring rate (from the initial 700r / min rises to 1000r / min) to fully mix the solution, the titration rate of the mixed metal salt solution is about 1 drop / second (about 4ml per minute), and the titration rate of the NaOH solution is controlled to maintain the pH of the coprecipitation r...

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Abstract

The invention discloses a preparation method of roasted calcium-magnesium-aluminum-based LDHs and application of the roasted calcium-magnesium-aluminum-based LDHs in phosphorus removal. The preparation method comprises the following steps: (a) preparing a mixed metal salt solution according to a certain molar ratio of divalent metal cations to trivalent metal cations, namely calcium, magnesium andaluminum, wherein a NaOH solution is used as a precipitant; (b) dropwise adding the mixed metal salt solution and the NaOH solution into a beaker containing a NaCl solution together, conducting stirring at a constant temperature within a set certain temperature range, controlling the titration speed of the mixed metal salt solution, stopping titration after the mixed metal salt solution is titrated, and continuing stirring at a constant temperature; and (c) carrying out water-bath crystallization for a period of time at a certain temperature, then centrifugally washing an obtained material with distilled water until no Cl is detected in a supernate, carrying out forced air drying,conducting grinding, and performing roasting at a certain temperature to obtain the roasted calcium-magnesium-aluminum-based LDHs. The preparation method is relatively simple, the phosphorus adsorption capacity of the obtained adsorbent is huge, and the adsorbent has good adsorption kinetics performance and can be applied to treatment of industrial and agricultural phosphorus-containing wastewater and emergency pollution treatment of phosphorus in ecological environment protection.

Description

technical field [0001] The invention belongs to the field of preparation and application of water treatment materials, and in particular relates to the preparation of a calcined calcium-magnesium-aluminum-based layered double hydroxyl compound metal hydroxide (LDHs) adsorbent and its application to phosphorus-containing wastewater. Background technique [0002] Phosphorus is widely used in agriculture and industry, but excessive use of phosphorus has brought about many problems, leading to eutrophication of water bodies, seriously deteriorating water quality, and destroying the stability of aquatic ecosystems. Therefore, wastewater must be treated before being discharged into the environment to reduce the disturbance to the ecological environment. At present, chemical, biological and physical adsorption methods are often used to remove phosphorus in wastewater. The chemical method is the initial and effective method to remove high-concentration phosphate, but the sedimentat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08C01F7/00C01F11/02C02F1/28B01J20/30C02F101/10
CPCB01J20/041B01J20/08C02F1/281C01F11/02C01P2002/72C01P2002/85C02F2101/105C01F7/785
Inventor 李岩肖利萍王哲蒙申宝华
Owner LIAONING TECHNICAL UNIVERSITY
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