Reproducible phosphorus-uptake ceramsite and preparation method thereof

A technology of ceramsite and particle size, which is applied in the field of renewable phosphorus-absorbing ceramsite and its preparation, can solve the problems of poor phosphorus absorption ability, low cost performance, and poor regeneration, and achieve strong phosphorus absorption ability, high cost performance, and recyclability Good results

Inactive Publication Date: 2012-06-27
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development of high-efficiency phosphorus-absorbing materials is the key technology for phosphorus removal by adsorption. Existing phosphorus-absorbing materials include: clay minerals, industrial waste, activated alumina, activated iron oxide, porous materials loaded with rare metal phosphorus adsorption layers, etc., some of which are The materials are powdery materials, and there are problems such as solid-liquid separation and reuse in use; some materials have poor phosphorus absorption ability, and some materials have poor phosphorus absorption ability, but poor regeneration; loading rare metals, although the adsorption capacity is large, but less cost-effective

Method used

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  • Reproducible phosphorus-uptake ceramsite and preparation method thereof
  • Reproducible phosphorus-uptake ceramsite and preparation method thereof
  • Reproducible phosphorus-uptake ceramsite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A renewable phosphorus-absorbing ceramsite and a preparation method thereof. Its preparation steps are as follows:

[0028] (1) Dry 70~75wt% of fly ash, 13~16wt% of coal powder and 12~14wt% of clay powder at 120~130°C for 2~3 hours respectively, and mix them evenly to prepare a mixture;

[0029] (2) Add the mixture into the disc pelletizer to form balls. The spray liquid used in the pelletizing process is 0.5~2.0% sodium silicate solution; Dry at ~150°C for 3~4h, then bake at 950~1000°C for 40~50min to obtain fired porous ceramsite;

[0030] (3) Soak the fired porous ceramsite in 0.10~0.20mol / L HCl solution for 20~24h, wash with tap water first, then wash with distilled water or deionized water until the pH value of the washing water is neutral, and then Dry at 100~105°C for 7~8h to obtain dried porous ceramsite;

[0031] (4) Add the dried porous ceramsite to ZrOCl with a concentration of 0.5~1.0mol / L 2 solution, the dried porous ceramsite and ZrOCl 2 The volume ra...

Embodiment 2

[0040] A renewable phosphorus-absorbing ceramsite and a preparation method thereof. Its preparation steps are as follows:

[0041] (1) Dry 75~78wt% of fly ash, 10~13wt% of coal powder and 11~14wt% of clay powder at 100~120°C for 3~4 hours, mix them evenly, and prepare the mixture;

[0042] (2) Add the mixture into the disc pelletizer to form balls. The spray liquid used in the pelletizing process is 0.5~2.0% sodium silicate solution; Dry at ~160°C for 2~3h, then bake at 1000~1100°C for 30~40min to obtain fired porous ceramsite;

[0043] (3) Soak the fired porous ceramsite in 0.20~0.30mol / L HCl solution for 16~20h, wash with tap water first, then wash with distilled water or deionized water until the pH value of the washing water is neutral, and then Dry at 105-110°C for 6-7 hours to obtain dried porous ceramsite;

[0044] (4) Add the dried porous ceramsite to ZrOCl with a concentration of 1.0~2.0mol / L 2 solution, the dried porous ceramsite and ZrOCl 2 The volume ratio of ...

Embodiment 3

[0048] A renewable phosphorus-absorbing ceramsite and a preparation method thereof. Its preparation steps are as follows:

[0049] (1) Dry 78~82wt% of fly ash, 12~15wt% of starch and 5~7wt% of clay powder at 110~130°C for 2~3 hours, mix them evenly, and prepare the mixture;

[0050] (2) Add the mixture into the disc pelletizer to form balls. The spray liquid used in the pelletizing process is 0.5~2.0% sodium silicate solution; Dry at ~140°C for 3~4h, then bake at 950~1000°C for 40~50min to obtain fired porous ceramsite;

[0051] (3) Soak the fired porous ceramsite in 0.10~0.20mol / L HCl solution for 16~20h, wash it with tap water first, then wash it with distilled water or deionized water until the pH value of the washing water is neutral, and then wash it in Dry at 100~105°C for 7~8h to obtain dried porous ceramsite;

[0052] (4) Add the dried porous ceramsite to ZrOCl with a concentration of 0.5~1.2mol / L 2 solution, the dried porous ceramsite and ZrOCl 2 The volume ratio...

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Abstract

The invention discloses a reproducible phosphorus-uptake ceramsite and a preparation method thereof. The technical scheme provided by the invention comprises the following steps of: respectively drying 70-85 wt% of fly ash, 10-16 wt% of pore-forming agent and 5-14 wt% of clay powder and uniformly mixing the raw materials; after balling the mixture, baking at a temperature in a range of 950-1100 DEG C for 30-50 min to obtain a baked porous ceramsite; sequentially immersing the baked porous ceramsite with HCl, washing with water and drying; and loading zirconium oxide hydrate to obtain the phosphorus-uptake ceramsite. The phosphorus-uptake ceramsite prepared by the invention can be directly added into or filled as a filtering column to remove phosphorus in the water and the adsorbed phosphorus-uptake ceramsite can be desorbed by a NaOH solution to be reproduced; the saturated adsorption capacity to the phosphorus is 10-11 mg / g and the adaptability to the change of the phosphorus concentration in the water is good; after the treatment, the solid-liquid separation is easy to realize and the water quality of the discharged water is better. The reproducible phosphorus-uptake ceramsite provided by the invention has the advantages of strong phosphorus-uptake capability, easiness of realizing the solid-liquid separation, good cyclic usability and higher cost performance, so that the reproducible phosphorus-uptake ceramsite is applicable to phosphorous removal of various types of wastewater and surface water.

Description

technical field [0001] The invention belongs to the technical field of phosphorus-absorbing ceramsite, and in particular relates to a renewable phosphorus-absorbing ceramsite and a preparation method thereof. technical background [0002] Eutrophication of water body seriously threatens the survival of aquatic organisms and human health, and the unreasonable discharge of phosphorus-containing wastewater is one of the important factors leading to eutrophication of water body. Improving the phosphorus removal efficiency of advanced sewage treatment is the key to control water eutrophication. Fundamental measures; Phosphorus is the main non-renewable fertilizer source; developing economical and efficient phosphorus removal materials is of great significance to water environment protection. [0003] Phosphorus removal by adsorption has the advantages of high efficiency, rapidity, no secondary pollution, simple operation and recyclable phosphorus resources, etc., and has broad ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B33/135B01J20/02C02F1/28C02F1/58
CPCY02P40/60
Inventor 雷国元刘志军
Owner WUHAN UNIV OF SCI & TECH
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