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Method for recycling iron powder in magnetic filters of cold rolling factory

A recovery method and filter technology are applied in the field of iron powder recovery from magnetic filters in cold rolling mills, which can solve the problems of long cleaning time and high cleaning temperature, and achieve the effects of short cleaning time, lower cleaning temperature and lower temperature.

Inactive Publication Date: 2012-07-18
石家庄市宏晟环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has the disadvantages of long cleaning time and high cleaning temperature.

Method used

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  • Method for recycling iron powder in magnetic filters of cold rolling factory
  • Method for recycling iron powder in magnetic filters of cold rolling factory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: The method for recovering iron powder in the magnetic filter of this cold rolling mill adopts the following process steps.

[0018] 1. Pretreatment: The magnetic filter of the cold rolling mill is separated by centrifugal sedimentation to remove most of the oil; the separated magnetic filter of the cold rolling mill is divided into upper, middle and lower layers, the upper layer is the rolling oil layer, and the middle layer is the The water layer and the lower layer are oil-containing iron powder, and the oil-containing iron powder can be obtained by removing the rolled oil layer and water layer;

[0019] 2. Cleaning: After the oil-containing iron powder is added to a water-based metal cleaning agent, it is ultrasonically and mechanically stirred for 20 minutes in an ultrasonic cleaner, and the temperature is kept at 40°C. The ultrasonic frequency of the ultrasonic cleaner is 40kHz, and the power density is 0.44W. / cm 2 ; Then the iron powder and the cle...

Embodiment 2

[0023] Embodiment 2: The method for recovering iron powder in the magnetic filter of this cold rolling mill adopts the following process steps.

[0024] 1. Pretreatment: Centrifugal sedimentation and separation of the magnetic filter in the cold rolling mill to remove most of the oil and obtain oily iron powder;

[0025] 2. Cleaning: After the oil-containing iron powder is added to a water-based metal cleaning agent, it is ultrasonically and mechanically stirred for 40 minutes in an ultrasonic cleaner, and the temperature is maintained at 80°C. The ultrasonic frequency of the ultrasonic cleaner is 20kHz, and the power density is 0.27W. / cm 2 ; Then the iron powder and the cleaning agent are separated by the method of accelerating the sedimentation by a magnet; clean 3 times with the cleaning agent according to the above steps;

[0026] 3. Rinsing: The iron powder after cleaning and separation is rinsed in an ultrasonic cleaner with deionized water; ultrasonic and mechanically...

Embodiment 3

[0028] Embodiment 3: The method for recovering iron powder in the magnetic filter of this cold rolling mill adopts the following process steps.

[0029] 1. Pretreatment: Centrifugal sedimentation and separation of the magnetic filter in the cold rolling mill to remove most of the oil and obtain oily iron powder;

[0030] 2. Cleaning: After the oil-containing iron powder is added to a water-based metal cleaning agent, it is ultrasonically and mechanically stirred for 10 minutes in an ultrasonic cleaner, and the temperature is kept at 60°C. The ultrasonic frequency of the ultrasonic cleaner is 40kHz, and the power density is 0.44W. / cm 2 ; Then the iron powder and the cleaning agent are separated by the method of accelerating the sedimentation by a magnet; clean 4 times with the cleaning agent according to the above-mentioned steps;

[0031] 3. Rinse: Rinse the cleaned and separated iron powder in an ultrasonic cleaner with deionized water; ultrasonic and mechanically stir for ...

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Abstract

The invention discloses a method for recycling iron powder in magnetic filters of a cold rolling factory. The method includes steps of pre-treating the magnetic filters of the cold rolling factory; cleaning obtained iron powder with oil by cleaning agent and rinsing the iron powder with oil cleaned by the cleaning agent by deionized water; and finally drying the iron powder. The iron powder with oil is cleaned by the cleaning agent and rinsed by the deionized water by the aid of an ultrasonic cleaning method. Oil stain on the surface of the iron powder can be peeled off by the aid of a cavitation effect of ultrasonic waves, on the one hand, vibration of the iron powder is caused by the ultrasonic waves, peeling speed of the oil stain of the surface of the iron powder is increased, cleaning time is shortened, and cleaning temperature is reduced. In addition, the method has the advantages of short cleaning time and low temperature and energy consumption, purity of the obtained nanometer iron powder is high, and the quality of the obtained nanometer iron powder is high.

Description

technical field [0001] The invention relates to a method for recovering iron powder, in particular to a method for recovering iron powder in the magnetic filter of a cold rolling mill. Background technique [0002] A lot of fine iron powder will be produced in the thin plate production process of the cold rolling mill and will continue to enter the emulsion. In order to keep the emulsion clean, a magnetic filter device is used to remove the iron powder in the emulsion to obtain a magnetic filter containing iron powder. After research, the particle size of iron powder in the magnetic filter of the cold rolling mill is at the nanometer level, which has high economic value. The magnetic filter of the cold rolling mill is a mixture of iron powder and rolling oil. The iron powder is wrapped in oil and can only be burned or buried as fuel oil, which pollutes the environment and wastes resources. The application number is 200410012152.X, which discloses a method for recovering nan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C23G1/00
Inventor 赵平张淑环
Owner 石家庄市宏晟环保科技有限公司
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