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A method for preparing magnetic flocculant by compounding fly ash magnetic beads and polyacrylamide

A polyacrylamide and magnetic flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, magnetic field/electric field water/sewage treatment, etc., to achieve uniform distribution of micro-magnetic beads, wide source of raw materials, clear environment benefit effect

Active Publication Date: 2016-02-10
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The technical problem to be solved by the present invention is to select and post-treat the magnetic microbeads in fly ash, realize the uniform compounding of magnetic beads and flocculants, improve the magnetic properties and structural stability of the magnetic flocculants, reduce production costs, and eliminate environmental pollution , improve production efficiency to be suitable for industrial production

Method used

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  • A method for preparing magnetic flocculant by compounding fly ash magnetic beads and polyacrylamide
  • A method for preparing magnetic flocculant by compounding fly ash magnetic beads and polyacrylamide
  • A method for preparing magnetic flocculant by compounding fly ash magnetic beads and polyacrylamide

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Experimental program
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Effect test

Embodiment 1

[0024] 1. Preparation of strong magnetic micro-magnetic beads

[0025] Weigh 100g of fly ash, dry it fully, first remove the residual carbon particles through a high-voltage electric separator, and then use a magnetic separation tube to perform magnetic separation under a magnetic field of 300mT to obtain the magnetic microbeads contained in the fly ash , and then the magnetic beads obtained are subjected to magnetic separation for 3 times under a magnetic field of 50mT to obtain strong magnetic beads; in the obtained strong magnetic beads, add 5% magnetite of strong magnetic beads quality powder (-200 mesh), then use zirconia ceramic balls as the grinding medium, and use sodium chloride as the protective salt, and ball mill for 4 hours at a speed of 100 rpm. Magnetic separation is carried out under a strong magnetic field to remove the weak magnetic and non-magnetic components, and obtain strong magnetic micro-magnetic beads with an average particle size of <5 μm.

[0026] 2...

Embodiment 2

[0033]Use pure polyacryloyl (12 million cationic) and the micro-magnetic beads / polyacrylamide magnetic flocculant prepared by the present invention as flocculants respectively for the simulated kaolin sewage (kaolin particle size-600 mesh, concentration: mass fraction 3%) to carry out the sedimentation treatment experiment. As a result, it was found that the clarification effect and efficiency of the magnetic flocculant of the present invention were improved compared with pure polyacrylamide without an external magnetic field, the turbidity was reduced by 16%, the settling velocity was increased by 25%, and the volume of tailings was reduced by 18%; After adding the external magnetic field, the sedimentation rate increased to 62%, the tailings volume decreased by 55%, the turbidity decreased basically unchanged, and the sewage treatment effect and efficiency were greatly improved.

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Abstract

The invention discloses a method for preparing a magnetic flocculating agent by compounding a coal ash magnetic bead and polyacrylamide. The method comprises the following steps of carrying out posttreatment, namely substep magnetic separation and ball milling, on coal ash to obtain microscopic magnetic bead turbid liquid; then adding the polyacrylamide for sufficient swelling; drying to obtain the magnetic flocculating agent. The method disclosed by the invention can realize the green high-efficiency preparation of the magnetic flocculating agent, is simple in process, is suitable for industrial production after being improved, and achieves the low price and realizes the resource recycling of wastes by utilizing the coal ash magnetic bead as a magnetic reinforcing agent because the coal ash is a solid waste, thus having high ecological environment benefit. The obtained magnetic flocculating has the advantages of high magnetism and good flocculation characteristic and meets the requirements for flocculation and magnetic separation in a sewage treatment process.

Description

1. Technical field [0001] The invention relates to a preparation method of a magnetic flocculant, in particular to a method for preparing the magnetic flocculant by compounding fly ash magnetic beads and polyacrylamide. 2. Background technology [0002] Flocculation is an important operation unit of high-concentration sewage treatment. By adding flocculant to aqueous solution, large flocs can be formed in water, thereby effectively removing suspended particles and sol particles in water. At present, the commonly used flocculants are divided into inorganic salt flocculants, inorganic polymer flocculants, organic polymer flocculants and microbial flocculants. These flocculants use the gravity of the flocs to achieve the settlement of the flocs, so there are problems such as insufficient floc settlement power, unstable flocculation effect, high cost, and large sludge production. [0003] In the case that the flocculation and sedimentation by the self-weight of the flocs cannot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C02F1/52C02F1/48
CPCC02F1/48C02F1/5236C02F1/56
Inventor 李建军朱金波李蒙蒙闵凡飞张丽亭包佳怡
Owner ANHUI UNIV OF SCI & TECH
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