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A method for preparing magnetic coagulant aid from metal-containing sludge and its application in strengthening pollutant removal

A technology of coagulation aid and resource utilization, which is applied in chemical instruments and methods, water/sludge/sewage treatment, pyrolysis treatment of sludge, etc., can solve the problem of high cost, complicated preparation process and difficult preparation of magnetic coagulant aid materials. High cost and other issues, achieve the effect of resource utilization, simple preparation process, and reduce preparation cost

Active Publication Date: 2021-10-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] CN108383223A discloses a kind of preparation method of nanometer magnetic coagulant aid material, described preparation method selects the divalent iron salt solution and the ferric salt solution that pass through the membrane as raw material, prepares precipitant, prepares ferric oxide particles, and Ferroferric oxide particles are separated by membrane separation technology to obtain nano-magnetic coagulation aid materials for water treatment in thermal power plants. The preparation process of this scheme is complicated and the preparation cost is high.
However, the above method has the problems of high preparation cost and complicated operation of the magnetic coagulant aid material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a method for the resourceful preparation of a magnetic coagulation aid, the method comprising the following steps:

[0048] (1) Drying the metal-containing sludge, and obtaining the sludge material after grinding, the drying temperature is 60° C., and the drying time is 12 hours;

[0049] (2) Carbonize the sludge material obtained in step (1) to obtain a magnetic material, the carbonization is carried out under an argon atmosphere, the flow rate of the protective atmosphere is 100mL / min, and the carbonization temperature is 300°C, The heating rate is 10°C / min, the time is 30min, and the temperature is maintained for 2h;

[0050] (3) Grinding the magnetic material obtained in step (2), grinding until the particle size is 75 μm to obtain the magnetic coagulation aid, coordinating the magnetic coagulation aid and flocculant polyferric sulfate to sewage treatment, magnetic aid The mass ratio of coagulant to flocculant is 1.43:1.00 (mg / mg).

Embodiment 2

[0052] This embodiment provides a method for the resourceful preparation of a magnetic coagulation aid, the method comprising the following steps:

[0053] (1) Drying the metal-containing sludge, and obtaining the sludge material after grinding, the drying temperature is 40° C., and the time is 24 hours;

[0054] (2) Carbonize the sludge material obtained in step (1) to obtain a magnetic material, the carbonization is carried out under an argon atmosphere, the flow rate of the protective atmosphere is 200mL / min, and the carbonization temperature is 900°C, The heating rate is 5°C / min, and the time is 120min;

[0055] (3) Grinding the magnetic material obtained in step (2), grinding until the particle size is 30 μm to obtain the magnetic coagulation aid, coordinating the magnetic coagulation aid and flocculant polyferric sulfate for sewage treatment, magnetic aid The mass ratio of coagulant to flocculant is 0.100:1.

Embodiment 3

[0057] This embodiment provides a method for the resourceful preparation of a magnetic coagulation aid, the method comprising the following steps:

[0058] (1) Drying the metal-containing sludge, and obtaining sludge material after grinding, the drying temperature is 80° C., and the drying time is 1 hour;

[0059] (2) Carbonize the sludge material obtained in step (1) to obtain a magnetic material, the carbonization is carried out under an argon atmosphere, the flow rate of the protective atmosphere is 150mL / min, and the carbonization temperature is 600°C, The heating rate is 8°C / min, and the time is 60min;

[0060] (3) Grinding the magnetic material obtained in step (2), grinding until the particle size is 200 μm to obtain the magnetic coagulation aid, coordinating the magnetic coagulation aid and flocculant polyferric sulfate to sewage treatment, magnetic aid The mass ratio of coagulant to flocculant is 10.0:1.

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Abstract

The invention provides a method for preparing a magnetic coagulant aid from metal-containing sludge and its application and a method for strengthening the removal of pollutants. The preparation method of the magnetic coagulant aid includes the following steps: (1) drying the metal-containing sludge processing to obtain sludge material; (2) carbonizing the sludge material obtained in step (1) to obtain a magnetic material; (3) grinding the magnetic material obtained in step (2) to obtain the magnetic coagulation aid. In the method, metal-containing sludge is utilized as a resource, and a magnetic coagulant aid material is prepared through high-temperature carbonization, which is used to degrade pollutants, thereby realizing the resource utilization of waste.

Description

technical field [0001] The invention belongs to the fields of new material preparation and resource recovery and utilization, and relates to a preparation method of magnetic materials, in particular to a method for preparing magnetic coagulation aids from metal-containing sludge and its application in strengthening pollutant removal. Background technique [0002] With the rapid development of my country's economy, water consumption has increased year by year, and sludge production has also increased. my country has built about 3,800 urban sewage treatment plants, with a daily sludge output of about 128,800 tons, and 30 million tons of sludge that has not been effectively and safely disposed of each year. In order to avoid the secondary pollution caused by sludge disposal, reusing sludge as a resource has become one of the most promising treatment methods. [0003] The composition of coagulation sludge is relatively complex, and the composition of sludge produced by differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/48C02F1/52C02F11/10C02F11/13
CPCC02F1/488C02F1/5236C02F11/10C02F11/13
Inventor 赵赫曹宏斌张笛孟晓飞侯蓉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI