Multi-step process for concentrating magnetic particles in waste sludges

Watson, John L

Title: Multi-step process for concentrating magnetic particles in waste sludges

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Abstract

This invention involves a multi-step, multi-force process for dewatering sludges which have high concentrations of magnetic particles, such as waste sludges generated during steelmaking. This series of processing steps involves (1) mixing a chemical flocculating agent with the sludge; (2) allowing the particles to aggregate under non-turbulent conditions; (3) subjecting the mixture to a magnetic field which will pull the magnetic aggregates in a selected direction, causing them to form a compacted sludge; (4) preferably, decanting the clarified liquid from the compacted sludge; and (5) using filtration to convert the compacted sludge into a cake having a very high solids content. Steps 2 and 3 should be performed simultaneously. This reduces the treatment time and increases the extent of flocculation and the effectiveness of the process. As partially formed aggregates with active flocculating groups are pulled through the mixture by the magnetic field, they will contact other particles and form larger aggregates. This process can increase the solids concentration of steelmaking sludges in an efficient and economic manner, thereby accomplishing either of two goals: (a) it can convert hazardous wastes into economic resources for recycling as furnace feed material, or (b) it can dramatically reduce the volume of waste materialmore » which must be disposed. « less

Inventors:

Watson, John L ^[1]

Rolla, MO

Issue Date:: 1990-01-01

Research Org.:: Battelle Memorial Institute, Columbus, OH (United States)

OSTI Identifier:: 867451

Patent Number(s):: 4940550

Assignee:: Curators of University of Missouri (Columbia, MO)

Patent Classifications (CPCs):: C - CHEMISTRY C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE C02F - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

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C - CHEMISTRY C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE C02F - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F11/121 - by mechanical de-watering

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
B01D37/03 - using flocculating agents

C - CHEMISTRY C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE C02F - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F1/52 - by flocculation or precipitation of suspended impurities {

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
B01D35/06 - Filters making use of electricity or magnetism

C - CHEMISTRY C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE C02F - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F11/14 - with addition of chemical agents

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DOE Contract Number:: AC06-76RL01830

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: multi-step; process; concentrating; magnetic; particles; waste; sludges; involves; multi-force; dewatering; concentrations; generated; steelmaking; series; processing; steps; mixing; chemical; flocculating; agent; sludge; allowing; aggregate; non-turbulent; conditions; subjecting; mixture; field; pull; aggregates; selected; direction; causing; form; compacted; preferably; decanting; clarified; liquid; filtration; convert; cake; solids; content; performed; simultaneously; reduces; treatment; time; increases; extent; flocculation; effectiveness; partially; formed; active; pulled; contact; larger; increase; concentration; efficient; economic; manner; accomplishing; goals; hazardous; wastes; resources; recycling; furnace; feed; material; dramatically; reduce; volume; disposed; waste sludges; solids content; magnetic particles; feed material; hazardous waste; waste material; magnetic field; hazardous wastes; processing steps; step process; processing step; form larger; dramatically reduce; magnetic particle; /210/

Citation Formats


                    Watson, John L. Multi-step process for concentrating magnetic particles in waste sludges.  United States: N. p., 1990. 
        Web.

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                    Watson, John L. Multi-step process for concentrating magnetic particles in waste sludges.  United States.

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                    Watson, John L. Mon .  
        "Multi-step process for concentrating magnetic particles in waste sludges".  United States.  https://www.osti.gov/servlets/purl/867451.

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@article{osti_867451,

  title        = {Multi-step process for concentrating magnetic particles in waste sludges},

  author       = {Watson, John L},

  abstractNote = {This invention involves a multi-step, multi-force process for dewatering sludges which have high concentrations of magnetic particles, such as waste sludges generated during steelmaking. This series of processing steps involves (1) mixing a chemical flocculating agent with the sludge; (2) allowing the particles to aggregate under non-turbulent conditions; (3) subjecting the mixture to a magnetic field which will pull the magnetic aggregates in a selected direction, causing them to form a compacted sludge; (4) preferably, decanting the clarified liquid from the compacted sludge; and (5) using filtration to convert the compacted sludge into a cake having a very high solids content. Steps 2 and 3 should be performed simultaneously. This reduces the treatment time and increases the extent of flocculation and the effectiveness of the process. As partially formed aggregates with active flocculating groups are pulled through the mixture by the magnetic field, they will contact other particles and form larger aggregates. This process can increase the solids concentration of steelmaking sludges in an efficient and economic manner, thereby accomplishing either of two goals: (a) it can convert hazardous wastes into economic resources for recycling as furnace feed material, or (b) it can dramatically reduce the volume of waste material which must be disposed.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1990},

  month        = {1}

}

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