Modified ceramsite capable of efficiently removing phosphorus and preparation method of modified ceramsite

A ceramsite, efficient technology, used in ceramic products, chemical instruments and methods, clay products, etc.

Pending Publication Date: 2020-10-30
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Biomass waste and industrial waste are used together for phosphorus removal, but there is no relevant report so far

Method used

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  • Modified ceramsite capable of efficiently removing phosphorus and preparation method of modified ceramsite
  • Modified ceramsite capable of efficiently removing phosphorus and preparation method of modified ceramsite
  • Modified ceramsite capable of efficiently removing phosphorus and preparation method of modified ceramsite

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Experimental program
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Effect test

preparation example Construction

[0027] The preparation method of the modified ceramsite of above-mentioned efficient dephosphorization comprises the following steps:

[0028] (1) With papermaking lime mud and fly ash as the main raw materials, after mixing according to the ratio, the green balls are made into green balls through a centrifugal ball forming machine, and the particle size of the green balls is controllable within the range of 2-20mm;

[0029] (2) After natural curing of the green balls prepared in step (1) for 20h-24h, drying at 105°C, and finally calcining to obtain ceramsite;

[0030] (3) Put the ceramsite in step (2) into KH with a total phosphorus concentration of 15-20mg / L 2 PO 4 In the solution, take it out after static adsorption to saturation;

[0031] (4) Dry the saturated ceramsite at 105°C for 1-2 hours, and then calcinate in a sintering furnace to obtain modified ceramsite with high efficiency for phosphorus removal.

Embodiment 1

[0034] Select the ratio of raw materials as 50wt% papermaking white mud and 50wt% fly ash, mix them with a cement mortar mixer, control the water-solid ratio to 0.05, and put the mixture into a centrifugal ball forming machine to form green balls. After natural curing for 24 hours, put the raw balls into a drying oven and dry at 105°C for 12 hours, and finally move them into a high-temperature calciner for calcination. ℃ and heat preservation for 2 h, and finally cooled with the furnace, the ceramsite with anorthite and anorthite as the main mineral phases, which has the characteristics of releasing calcium for alkali, and its XRD pattern is as follows figure 1 shown.

Embodiment 2

[0035] Example 2 Phosphorus removal and modification of ceramsite by static adsorption method

[0036] Analytical grade reagent KH 2 PO 4 Configure the simulated phosphorus-containing sewage with a total phosphorus concentration of 20mg / L. Put the ceramsite prepared in Example 1 into the simulated phosphorus-containing sewage with the dosage of 20g / L, put it into the water bath constant temperature oscillation box, and vibrate horizontally under the conditions of 25°C and 120r / min, at different time intervals (0.5 , 1, 3, 6, 9, 12, 16, 20, 24h) to take samples, filter and extract water samples through a 0.45μm filter membrane, measure the remaining phosphorus concentration, and calculate the phosphorus removal rate. The results are as follows figure 2 shown. It can be seen that the ceramsite reached the adsorption equilibrium in about 16 hours, the removal rate was 82%, and the adsorption capacity was 0.82 mg / g.

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Abstract

The invention provides modified ceramsite capable of efficiently removing phosphorus and preparation method of modified ceramsite. The modified ceramsite is prepared by taking papermaking white mud and fly ash as main raw material, and is prepared from, by weight, 40-60% of papermaking white mud and 40-60 wt% of fly ash. The preparation method comprises the following steps: (1) taking papermakingwhite mud and fly ash as main raw materials, uniformly mixing the main raw materials according to a ratio, and preparing green pellets with the particle size controllable in a range of 2-20mm by usinga centrifugal ball forming machine; (2) naturally curing the green pellets prepared in the step (1) for 20-24 hours, drying at 105 DEG C, and finally calcining to obtain ceramsite; (3) putting the ceramsite obtained in the step (2) into a KH2PO4 solution with the total phosphorus concentration of 15-20mg/L, statically adsorbing until saturation, and taking out; and (4) drying the ceramsite subjected to adsorption saturation at 105 DEG C for 1-2 hours, and calcining in a sintering furnace to obtain the modified ceramsite capable of efficiently removing phosphorus. The ceramsite prepared by theinvention has alkali supply and calcium release capabilities before and after modification, and can achieve the purpose of phosphorus removal. The modified ceramsite prepared by the invention is highin speed, large in adsorption capacity and remarkable in effect when used for adsorbing and removing phosphorus.

Description

technical field [0001] The invention belongs to the technical field of material preparation and environmental engineering water treatment, and in particular relates to a modified ceramsite for efficient phosphorus removal and a preparation method thereof. Background technique [0002] In the past two decades, the phosphorus chemical industry in my country has developed rapidly, but at the same time, the environmental pollution caused by phosphorus has become increasingly serious, which has threatened the survival of aquatic organisms and human health. For example, long-term drinking of water with phosphorus exceeding the standard can lead to osteoporosis and mandibular osteonecrosis. [0003] At present, the widely used phosphorus removal technologies include chemical precipitation, biological method and adsorption method. The adsorption method has attracted much attention because of its small footprint, simple process, convenient operation, and no secondary pollution. Ads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/135C04B33/132C04B33/32C04B41/85B01J20/10B01J20/08B01J20/04B01J20/30C02F1/28C02F101/10
CPCC04B33/1352C04B33/1328C04B33/132C04B33/32C04B38/009C04B41/85C04B41/5015B01J20/103B01J20/08B01J20/041C02F1/281C02F2101/105Y02P40/60
Inventor 秦娟欧昌进徐婕王俊跃杨文轩吴妤婕刘蔚汤若文戴苏皖顾凯屹
Owner NANTONG UNIVERSITY
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