Magnetic separation method and device for treating oil-containing graphite wastewater

A magnetic separation device and magnetic separation technology, which are applied in water/sewage treatment, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve problems that do not involve the removal of suspended solids.

Inactive Publication Date: 2017-05-31
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the article only discusses the treatment of oil, and does not involve the removal of suspended solids

Method used

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  • Magnetic separation method and device for treating oil-containing graphite wastewater
  • Magnetic separation method and device for treating oil-containing graphite wastewater
  • Magnetic separation method and device for treating oil-containing graphite wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A magnetic separation method for processing oily graphite wastewater is as follows:

[0042] Send the oil-containing graphite wastewater with an oil content of 49.7mg / L and a total suspended solids of 196.3mg / L into the pressurized dissolved air flotation tank, the dissolved air pressure is 0.30MPa, the reflux ratio is 15%, and the separation load is 13m 3 / m 2 h, the hydraulic retention time is 30min, and about 40% of oil is removed; after the air flotation treatment, the air flotation water is sent to the water inlet tank 1 in the magnetic separation device, and enters the purification process through the pre-magnetic processor 11 in the middle of the water inlet tank 1 Water tank 12, the waste water after the pre-magnetization is flocculated in the purified water tank 12, then precipitates part of the flocs in the inclined tube sedimentation tank 3, the flow rate of the inclined tube sedimentation tank 3 is 25mm / s, and the effluent enters the water tank 16, and the ...

Embodiment 2

[0044] A magnetic separation method for processing oily graphite wastewater is as follows:

[0045] Send the oil-containing graphite wastewater with an oil content of 49.7mg / L and a total suspended solids of 196.3mg / L into the pressurized dissolved air flotation tank, the dissolved air pressure is 0.25MPa, the reflux ratio is 10%, and the separation load is 10m 3 / m 2 h, the hydraulic retention time is 20min, and about 40% of oil is removed; after the air flotation treatment, the air flotation water is sent to the water inlet tank 1 in the magnetic separation device, and enters the purification through the pre-magnetic processor 11 in the middle of the water inlet tank 1 Water tank 12, the pre-magnetized waste water is flocculated in the purified water tank 12, and then part of the flocs are precipitated in the inclined tube sedimentation tank 3. Under the action of a magnetic field, the remaining flocs and suspended matter in the water are adsorbed on the disk 7, and the pro...

Embodiment 3

[0047] A magnetic separation method for processing oily graphite wastewater is as follows:

[0048] Send the oil-containing graphite wastewater with an oil content of 49.7mg / L and a total suspended solids of 196.3mg / L into the pressurized dissolved air flotation tank, the dissolved air pressure is 0.35MPa, the reflux ratio is 12%, and the separation load is 11m 3 / m 2 h, the hydraulic retention time is 25min, and about 40% of oil is removed; after the air flotation treatment, the air flotation water is sent to the water inlet tank 1 in the magnetic separation device, and enters the purification process through the pre-magnetic processor 11 in the middle of the water inlet tank 1 Water tank 12, the pre-magnetized waste water is flocculated in the purified water tank 12, and then part of the flocs are precipitated in the inclined tube sedimentation tank 3. Under the action of a magnetic field, the remaining flocs and suspended matter in the water are adsorbed on the disk 7, and...

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PUM

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Abstract

The invention relates to a magnetic separation method for treating oil-containing graphite wastewater, and aims to treat oil and suspended substances in the oil-containing graphite wastewater by using a combined process of air flotation and magnetic separation. The magnetic separation method comprises the following steps: A, firstly, adding wastewater into an air flotation tank so as to enable suspended solids such as a part of oil and graphite in the wastewater to emerge from the water level in an air flotation manner, and scraping the suspended solids into a residue tank, wherein an internal circulation type jet flow pressurization dissolved air flotation method is adopted for air flotation, the dissolved air pressure is 0.25-0.4MPa, the reflux ratio is 10-15%, the separation load is 10-13m<3> / m<2>.h, and the retention time is 20-30 minutes; B, feeding air flotation effluent into a magnetic separation device, performing pre-magnetization by using a pre-magnetization treater in the magnetic separation device, feeding the air flotation effluent into an inclined tube sedimentation tank along with sewage, controlling the flowing speed of the inclined tube sedimentation tank to be 20-35mm / s, subsequently enabling flocculating constituents and suspended solids retained in the water to adhere to a magnetic disc by using a magnetic disc separator, controlling the flowing speed of wastewater flowing through a single magnetic disc separator to be 200-400m<3> / h, scraping the sludge into a sludge discharge device by using a sludge scraper plate, and discharging out treated clean water from a water outlet. The magnetic separation method is free of water treatment agent, and is applicable to treatment on sewage which contains oil and graphite and is not liable to naturally precipitate.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a magnetic separation method and device for treating oil-containing graphite wastewater. Background technique [0002] In the production process of hot-rolled seamless steel pipes in seamless plants, it is necessary to add high-temperature water-based mandrel lubricants to lubricate the seamless pipes. The main component of graphite milk is mixed with spray water during the cooling of the rolling mill and enters the circulating water system. , causing the content of suspended solids in circulating water to exceed the standard; during the rolling cooling process, the cooling water will also bring a certain amount of lubricating oil and hydraulic oil. In the high-temperature water-based mandrel lubricant, sodium tripolyphosphate and sodium lignosulfonate , dispersant, anti-sedimentation agent, etc., to form relatively stable oil-containing graphite wastewater, which is diff...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F1/48C02F103/16C02F101/10C02F101/32
CPCC02F9/00C02F1/481C02F1/488C02F2101/10C02F2101/32C02F2103/16
Inventor 王飞
Owner ANGANG STEEL CO LTD
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