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Fly ash-based magnetic coagulant for treating lead-containing wastewater as well as preparation method, application and regeneration method of fly ash-based magnetic coagulant

A fly ash, magnetic coagulation technology, applied in water treatment parameter control, special treatment targets, water/sewage treatment and other directions, can solve the problems of poor reuse performance, complicated preparation methods, poor treatment effect of heavy metal wastewater, etc. , to achieve good adsorption effect, improve adsorption effect, good effect of repeated regeneration performance

Pending Publication Date: 2021-12-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a fly ash-based magnetic coagulant for treating lead-containing wastewater and its preparation method, application and regeneration method, so as to solve the problem of complex preparation methods of the fly ash-based magnetic coagulant provided by the prior art and heavy metal wastewater. Poor handling and poor reuse performance

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  • Fly ash-based magnetic coagulant for treating lead-containing wastewater as well as preparation method, application and regeneration method of fly ash-based magnetic coagulant

Examples

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preparation example Construction

[0022] The invention provides a preparation method of a fly ash-based magnetic coagulant for treating lead-containing wastewater, comprising the following steps:

[0023] (1) modifying the fly ash with sodium hydroxide solution to obtain modified fly ash;

[0024] (2) Combine modified fly ash with γ-Fe 2 o 3 Mixed to obtain fly ash-based magnetic coagulant.

[0025] In the present invention, the mass volume ratio of fly ash and sodium hydroxide solution in step (1) is preferably 0.5-2g: 2-4mL; more preferably 1-1.8g: 2.3-3mL; more preferably 1g: 3mL .

[0026] In the present invention, the concentration of the sodium hydroxide solution in step (1) is preferably 0.5-2 mol / L; more preferably 0.8-1.7 mol / L; more preferably 1 mol / L.

[0027] In the present invention, the modification temperature in step (1) is preferably 25-60°C, and the time is preferably 50-70min; more preferably, the modification temperature is 36-52°C, and the time is 53-62min; more preferably, The modifi...

Embodiment 1

[0043] This embodiment provides a fly ash-based magnetic coagulant, the preparation method of which comprises the following steps:

[0044] (1) Screen the fly ash with a 240-mesh sieve, and dry the undersieve at 110° C. for 1 hour to obtain dry fly ash;

[0045] (2) Stir and modify 20g of dry fly ash and 60mL of 1mol / L sodium hydroxide solution at 45°C for 55min. Drying for 2 hours, grinding to a particle size of less than 30 μm to obtain modified fly ash;

[0046] (3) Combine modified fly ash with γ-Fe 2 o 3 Mix according to the mass ratio of 5:2 to obtain fly ash-based magnetic coagulant.

[0047] Using the above-mentioned fly ash-based magnetic coagulant for Pb-containing 2+ Heavy metal wastewater treatment methods are:

[0048] The volume of heavy metal wastewater is 100mL, in which Pb 2+ The initial concentration is 25mg / L, and the mass volume ratio of fly ash-based magnetic coagulant to heavy metal wastewater is 1.4g:100mL. Adjust the pH of heavy metal wastewater ...

Embodiment 2

[0050] This embodiment provides a fly ash-based magnetic coagulant, the preparation method of which comprises the following steps:

[0051] (1) Screen the fly ash with a 240-mesh sieve, and dry the undersieve at 100°C for 1.2 hours to obtain dry fly ash;

[0052] (2) Stir and modify 20g of dry fly ash and 40mL of 0.6mol / L sodium hydroxide solution at 33°C for 54min. Dry at ℃ for 2 hours, grind until the particle size is less than 30 μm, and obtain modified fly ash;

[0053] (3) Combine modified fly ash with γ-Fe 2 o 3 Mix according to the mass ratio of 4.8:2 to obtain fly ash-based magnetic coagulant.

[0054] Using the above-mentioned fly ash-based magnetic coagulant for Pb-containing 2+ Heavy metal wastewater treatment methods are:

[0055] The volume of heavy metal wastewater is 200mL, of which Pb 2+ The initial concentration is 20mg / L, and the mass volume ratio of fly ash-based magnetic coagulant to heavy metal wastewater is 8g:100mL. Adjust the pH of heavy metal wa...

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Abstract

The invention belongs to the technical field of coagulants, and discloses a fly ash-based magnetic coagulant for treating lead-containing wastewater as well as a preparation method, application and a regeneration method. The preparation method comprises the following steps: modifying fly ash by using a sodium hydroxide solution with the concentration of 0.5-2 mol / L, and mixing the modified fly ash with gamma-Fe2O3 to obtain the fly ash-based magnetic coagulant. The fly ash is modified by sodium hydroxide, so that decomposition of silicon and aluminum materials in the fly ash is facilitated, Si-O and Al-O bonds are relaxed, the adsorption capacity of the fly ash is improved, and the adsorption effect of the fly ash on heavy metals in wastewater is improved. The used sodium hydroxide is low in concentration and low in dosage. The prepared magnetic coagulant is capable of removing suspended matters and pollutants in sewage and reducing turbidity. A good adsorption effect on heavy metal lead ions can be realized. After regeneration, the lead removal rate can still reach 94% or above. The magnetic coagulant is good in repeated regeneration performance and low in production cost.

Description

technical field [0001] The invention relates to the technical field of coagulants, in particular to a fly ash-based magnetic coagulant for treating lead-containing wastewater, a preparation method, an application and a regeneration method. Background technique [0002] Fly ash is the fly ash produced during the coal combustion process of the boiler, and its main component is SiO 2 and Al 2 o 3 , and a small amount of Fe 2 o 3 , CaO, MgO, etc. At present, the amount of fly ash produced by coal-fired power plants in my country is huge, but the utilization rate of fly ash is relatively low. It is mainly used in the field of building materials. The accumulation of a large amount of fly ash will pollute the environment and cause waste of resources. The resource utilization of coal ash has important research significance. [0003] Fly ash is a product of high-temperature calcination, and its surface has an irregular porous structure. This structure provides the possibility to...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/28C02F1/48C02F101/20
CPCC02F1/5236C02F1/281C02F1/488C02F2101/20C02F2209/11C02F2209/10C02F2303/16
Inventor 齐立强王吻王旭薛浩博
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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