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Technology of resourceful treatment of cold rolling oil sludge and recovery of iron powder

A cold-rolled sludge and recycling technology, applied in sludge treatment, water/sludge/sewage treatment, multi-stage water treatment, etc., can solve the problems of increasing the burden of iron-making blast furnaces and reducing the added value of nano-scale iron powder, etc. Achieve the effect of high reuse value and simple process

Pending Publication Date: 2019-11-01
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the treatment of oil sludge back to the furnace has the advantage of being easy to implement, CN 107937003A discloses a treatment method for blast furnace ironmaking after mixing oil sludge with coking coal, coking dust, tar slag, etc., and then pressing balls, but the above-mentioned treatment method will significantly reduce the nanoscale iron powder. Added value, at the same time, if the curing agent selected for the furnace treatment is not appropriate, it will increase the burden on the ironmaking blast furnace

Method used

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  • Technology of resourceful treatment of cold rolling oil sludge and recovery of iron powder

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Experimental program
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Effect test

Embodiment 1

[0025] The oil sludge absorbed by the first magnetic filter in the degreasing and cleaning section of a cold rolling mill is transported to the centrifuge. The centrifuge rotates at 15,000 rpm and the centrifugation time is 5 minutes. About 35% of the water and oil in the oil sludge are removed and poured into the waste water processing center. The oil sludge after centrifugal treatment is concentrated to achieve the purpose of reduction treatment.

[0026] The concentrated oil sludge enters the cleaning tank, and is added with an alkaline solution containing surfactants: 2.5% sodium carbonate, 0.5% low-foaming surfactant polyvinyl alcohol, and 0.5% lower alcohol n-butanol, and wash at 65°C for 1 min.

[0027] The second magnetic filter recovers the iron powder in the cleaning tank and then washes it again, and the cleaning waste liquid is imported into the public and auxiliary wastewater treatment center of the factory. Since the oil sludge is centrifugally concentrated, the...

Embodiment 2

[0031] The oil sludge absorbed by the first magnetic filter in the degreasing and cleaning section of a cold rolling mill is transported to the centrifuge. The centrifuge rotates at 3000 rpm and the centrifugation time is 10 minutes. About 30% of the water and oil in the oil sludge are removed and poured into the waste water processing center. The oil sludge after centrifugal treatment is concentrated to achieve the purpose of reduction treatment.

[0032] The concentrated oil sludge enters the cleaning tank, and the cold-rolled strip cleaning section lye is added for cleaning for 5 minutes.

[0033] The magnetic filter recovers the iron powder in the cleaning tank and then washes it once, and the cleaning waste liquid is sent to the public and auxiliary wastewater treatment center of the factory. Due to the small amount of sludge, less water consumption during cleaning, less cleaning waste liquid is produced, and the composition of the waste liquid generated by cleaning the ...

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Abstract

The invention relates to a technology of resourceful treatment of cold rolling oil sludge and recovery of iron powder. Equipment adopted for the technology of resourceful treatment of the cold rollingoil sludge and recovery of the iron powder comprises a first magnetic filter, a centrifugal machine, a cleaning groove, a second magnetic filter and a dryer which are sequentially connected, the technology of resourceful treatment of the cold rolling oil sludge and recovery of the iron powder is as follows: the oil sludge which is generated by filtering cold rolling strip steel cleaning segment alkali liquid or emulsified liquid by the first magnetic filter is conveyed to the centrifugal machine, low-density oil water subjected to centrifugal treatment enters a wastewater treatment center, the high-density oil sludge enters the cleaning groove, and the iron powder in the oil sludge cleaned by the cleaning groove is recovered by the second magnetic filter, and is dried by the dryer to obtain the iron powder. According to the technology of resourceful treatment of the cold rolling oil sludge and recovery of the iron powder, a large amount of iron-containing oil sludge which is generatedin cold rolling strip steel rolling and cleaning processes is used as a treatment object, oil sludge reduction is achieved, and the high-value-added iron powder can be extracted at the same time. Thetechnology process is simple, cleaning segment cleaning liquid can be directly adopted as a cleaning medium, and no additional wastewater treatment units are added.

Description

technical field [0001] The invention relates to the field of cold-rolling oil sludge recycling, and more specifically relates to a process for recycling iron powder from cold-rolling oil sludge. Background technique [0002] At present, during the rolling and cleaning process of cold-rolled strip steel, a large amount of iron-containing sludge will be produced, which is highly toxic to the environment when it is used as solid waste, and will cause secondary pollution when it is transported, and the sludge contains high value-added nano-scale iron Iron powder, due to the coating effect of oil cement, the particle size of iron powder clusters is between 5-10 μm. The value of recovering nanoscale iron powder is extremely high. Although the treatment of oil sludge back to the furnace has the advantage of being easy to implement, CN 107937003A discloses a treatment method for blast furnace ironmaking after mixing oil sludge with coking coal, coking dust, tar slag, etc., and then...

Claims

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Application Information

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IPC IPC(8): C02F11/121C02F11/127B22F9/02C23G1/19B82Y40/00C02F103/16
CPCB22F9/02B82Y40/00C02F11/121C02F11/127C02F2103/16C02F2301/08C23G1/19
Inventor 王耀吴迪青周云根梁芳况群意
Owner WISDRI ENG & RES INC LTD
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