JPH0685044U - Iron recovery equipment from incineration ash - Google Patents

Abstract

(57) [Summary] [Purpose] To recover iron in incinerator ash with high water content at a high recovery rate. [Structure] In an iron content recovery device for incineration ash 7 in which iron in incineration ash 7 discharged from an incinerator is recovered by a magnetic separator 3, a vibrating feeder 1 for conveying the incineration ash 7 is provided below the magnetic separator 3. An air injection hole 5 is provided on the entire surface in the width direction of the upper surface of the vibrating feeder 1 facing the adsorption portion of the magnetic separator, and a pressure air supply pipe 6 is connected to the vibrating feeder 1. [Structure] It is possible to prevent the sludge from adhering to the transfer device, and to efficiently recover iron with high magnetic separation efficiency.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an apparatus for recovering iron from incinerated ash incinerated in an incinerator in incineration, which is an intermediate treatment method for industrial waste and household general waste.

[0002]

[Prior art]

 The incinerator in a steel mill incinerates about 60% of iron waste and 5 to 15% of oil-containing sludge and paper scraps, which are industrial waste generated in the incinerator. Impurities are mixed in by erosion and the like, which hinders the effective use of iron in the incineration ash. Therefore, these incineration ash are conventionally landfilled. In addition, scraps such as empty cans, nails, and metal fittings are mixed in the incinerated ash obtained by incinerating household general waste.

As an iron content recovery apparatus for incineration ash obtained by incinerating general waste from the above-mentioned households, a water washing apparatus equipped with a water-sealing scraper conveyor that collects iron content in the residue discharged from the incinerator by a magnetic separator. In the iron recovery device that treats and recovers with the above, a sprinkler is arranged above the inclined surface of the water washing device on the iron delivery side, and a gap is formed between the trough surface and the scraper at a proper position on the inclined surface. Moreover, after the iron component in the incineration residue discharged from the incinerator is collected by a magnetic separator, a device (Japanese Utility Model Publication No. 55-122849) in which a relatively coarse screen is provided on the inclined surface of the portion where the gap is formed. In an iron content recovery apparatus for performing water washing treatment and recovery in an iron pit, an ash pit, an ash sewage sedimentation pit, and a sewage pit are connected to the iron pit, and the washing is performed on the upper side wall of the iron pit. An apparatus provided with a nozzle (Japanese Utility Model Laid-Open No. 57-148481) has been proposed.

[0004]

[Problems to be solved by the device]

The incineration ash from the incinerator in the above ironworks contains about 50% of iron, but contains many impurities such as Al ₂ O ₃ , Zn, Na ₂ O and K ₂ O. Therefore, an attempt was made to recover sludge using a magnetic separator.However, since the incinerated ash is cooled by water in the cooling pit, there is a large amount of water, and there is sludge that remains on the conveyor and is not adsorbed by the magnetic separator. However, there is a drawback that the recovery efficiency is low. In the devices disclosed in Japanese Utility Model Publication No. 55-122849 and Japanese Utility Model Publication No. 57-148481, the iron content in the incineration residue was collected by a magnetic separator and washed with water to adhere to the iron content. It is for removing ash and sludge, and does not improve the iron recovery rate in the incinerated ash by the magnetic separator.

An object of the present invention is to provide an iron content recovery device for incinerated ash, which can recover the iron content in the high-moisture incineration ash at a high recovery rate.

[0006]

[Means for Solving the Problems]

 The present inventors have conducted various tests and examinations in order to achieve the above object. As a result, in order to prevent the incinerated ash containing a large amount of water from adhering to the conveyor, it is sufficient to convey the incinerated ash using the vibrating feeder below the magnetic separator, and the width of the vibrating feeder below the magnetic separator. We have confirmed that the magnetic separation efficiency is improved by providing air injection holes on the entire surface in the direction of the magnetic separator and floating the sludge under the magnetic separator, and arrived at the present invention.

That is, the present invention is an iron recovery device for incinerated ash that recovers iron in incinerated ash discharged from an incinerator by a magnetic separator, and a vibrating feeder for conveying the incinerated ash is provided below the magnetic separator. An iron recovery device from incinerator ash, characterized in that an air ejection hole is provided on the entire surface in the width direction of the vibrating feeder facing the adsorption part of the magnetic separator, and a pressure air supply pipe is connected to the vibrating feeder.

[0008]

[Action]

 In this invention, a vibrating feeder that conveys incinerated ash is provided below the magnetic separator, an air injection hole is provided on the entire surface of the vibrating feeder facing the adsorption part of the magnetic separator, and a pressure air supply pipe is connected to the vibrating feeder. Therefore, the incineration ash with high water content is prevented from adhering by the vibration of the vibration feeder, and the sludge is floated by the compressed air injected from the air injection holes in the magnetic separator adsorption unit, which improves the magnetic separation efficiency of the magnetic separator. However, the efficiency of iron recovery from incineration ash is improved.

In the vibrating feeder used in the present invention, air injection holes are formed in the entire upper surface width direction facing the magnetic separator adsorption portion, and compressed air is injected from the pressure air supply pipe connected to the vibrating feeder. There is no particular limitation as long as the sludge ejected from the holes and transported by the vibration feeder to the magnetic separator adsorption unit floats. The diameter of the air injection hole formed on the upper surface of the vibrating feeder varies depending on the type of incineration ash, but in the case of incineration ash obtained by co-firing oil-containing sludge and paper scraps from the above-mentioned steelworks, it is suitable to be about 5 mm.

[0010]

【Example】

 Embodiment 1 The details of the iron recovery apparatus from incineration ash of the present invention will be described below with reference to FIGS. 1 and 3 showing an embodiment. FIG. 1 is a side view of an iron recovery apparatus for incinerated ash according to the present invention, FIG. 2 is a plan view of a vibrating feeder used in the present invention, and FIG. 3 is a view taken along line AA of FIG. In FIG. 1, 1 is a vibrating feeder having eurus motors 2 on both sides, 3 is a magnetic separator having a magnet 4 such as a permanent magnet or an electromagnet arranged above the vibrating feeder 1, and 5 is opposed to an attracting portion of the magnetic separator 3. The vibrating feeder 1 has an air injection hole having a diameter of 5 mm formed in the entire width direction of the upper surface, and 6 is a pressure air supply pipe having flexible portions (not shown) connected to both side surfaces of the air injection hole 5 of the vibrating feeder 1. Thus, the incineration ash 7 conveyed to the lower part of the magnetic separator 3 is configured to float by the compressed air injected from the air injection holes 5 when reaching the perforated portion of the vibrating feeder 1.

Reference numeral 8 denotes an iron recovery conveyor, and the magnetic substance 9 in the incineration ash 7 floating under the magnetic separator 3 is adsorbed to the magnetic separator 3 by the magnetic force of the magnet 4 and conveyed, and reaches a position where the magnet 4 does not exist. It is dropped and placed on the iron recovery conveyor 8. Reference numeral 10 is a non-magnetic substance recovery conveyor that recovers non-magnetic substances in the incineration ash 7 that have not been adsorbed by the magnetic separator 3, and is a non-magnetic substance in the incineration ash 4 that is conveyed to the lower part of the magnetic separator 3 by the vibration feeder 1 and floats. Is configured so as to be dropped and conveyed from the vibration feeder 1 onto the non-magnetic material recovery conveyor 10.

With the above-described configuration, the incinerated ash 7 containing a large amount of water, which is supplied to the vibrating feeder 1 by the conveyor (not shown), does not adhere to the vibrating feeder 1 due to the vibration of the eurus motor 2 and is sequentially transferred to the magnetic separator 3. When it is transported to the suction unit and reaches the perforated portion of the vibrating feeder 1, it is supplied from the pressure air supply pipe 6 and floats by the pressure air jetted from the air jet hole 5. The magnetic substance 9 in the incineration ash 7 floating in the adsorption part of the magnetic separator 3 is highly efficiently adsorbed by the magnetic separator 3 and conveyed by the magnetic force of the magnet 4, and reaches the position where the magnet 4 does not exist. It is dropped and placed on the top and conveyed to a recovery hopper or the like (not shown). On the other hand, the non-magnetic material 11 in the incineration ash 7 that has not been adsorbed by the magnetic separator 3 falls from the vibration feeder 1 onto the non-magnetic material recovery conveyor 10 and is recovered by a non-magnetic material hopper (not shown). Landfilled.

Example 2 The iron content recovery apparatus for incinerated ash according to the present invention shown in Example 1 and, as shown in FIG. 4, the incinerated ash 22 is conveyed to the adsorption section of the magnetic separator 24 having the magnet 23 by the conveyor 21. The magnetic substance 25 in the incineration ash 22 is adsorbed and conveyed by the magnetic force of the magnet 23 of the magnetic separator 24 and is dropped and placed on the iron recovery conveyor 26. A conventional iron recovery device for incinerated ash, in which the material 27 is dropped from the transfer conveyor 21 onto the non-magnetic material recovery conveyor 28 and transferred, is used to mix and burn oil-impregnated sludge and paper waste in an incinerator in an incinerator. Iron was recovered from the incinerated ash having the composition shown below. Table 2 shows the composition of the recovered magnetic and non-magnetic materials and the iron recovery rate. The iron recovery rate was calculated as the amount of iron in the recovered magnetic material with respect to the amount of iron in the incinerated ash treated.

[0014]

[Table 1]

[0015]

[Table 2]

As shown in Table 2, according to the device of the present invention, the iron recovery rate can be significantly improved to 80% as compared with the iron recovery rate of 57% of the conventional apparatus. It is considered that this is because the magnetic separation efficiency was improved by preventing the incineration ash containing a large amount of water from adhering to the bottom of the magnetic separator by the vibration feeder and by floating the compressed air injected from the air injection holes.

[0017]

[Effect of device]

 As described above, according to the present invention, it is possible to prevent sludge from adhering to the transfer device when recovering iron from incinerated ash with high water content, and to recover iron efficiently with high magnetic separation efficiency. .

[Brief description of drawings]

FIG. 1 is a side view of a device for recovering iron from incineration ash according to the present invention.

FIG. 2 is a plan view of a vibrating feeder used in the present invention.

FIG. 3 is a view taken along line AA of FIG.

FIG. 4 is a side view of a conventional iron content recovery apparatus from incineration ash used in Example 2.

[Explanation of symbols]

 1 Vibration Feeder 2 Eurus Motor 3, 24 Magnetic Separator 4, 23 Magnet 5 Air Injection Hole 6 Pressure Air Supply Pipe 7, 22 Incinerated Ash 8, 26 Iron Recovery Conveyor 9, 25 Magnetic Material 10, 28 Non-Magnetic Material Recovery Conveyor 11, 27 non-magnetic material 21 transport conveyor

Claims (1)

[Scope of utility model registration request] 1. A device for recovering iron from incinerator ash, which recovers iron in incinerator ash discharged from an incinerator by a magnetic separator,
A vibratory feeder that conveys incinerated ash is installed below the magnetic separator.
An iron recovery device from incineration ash, characterized in that an air injection hole is provided in the entire width direction of the vibrating feeder facing the adsorption part of the magnetic separator, and a pressure air supply pipe is connected to the vibrating feeder.