JPS6122717Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for recovering iron from combustion residue discharged from an incinerator, and in particular, it efficiently removes ash, sludge, etc. attached to or mixed in on the surface or inside of iron products, and produces high-quality products. The present invention relates to an improved iron recovery device capable of recovering iron.

The combustion residue discharged from the incinerator contains empty cans,
Nails, iron fittings, etc. contain large amounts of iron, and it is customary to collect and reuse these irons from the perspective of effective resource utilization. Magnetic separators have traditionally been used as iron recovery equipment for this purpose, but the iron recovered by the magnetic separators is often contaminated with ash and sludge, which poses a major obstacle to the reuse of the recovered iron. bring. Therefore, recently, a technology has been proposed in which the iron collected by a magnetic wire machine is treated with a water washing device equipped with a water ring scraper conveyor to remove the ash and sludge. That is, in this method, iron (with ash, sludge, etc. attached) collected by a magnetic separator is put into a washing device and immersed, and the settled iron is washed away.
Iron is collected by a scraper conveyor that rotates along the bottom surface of the washing device, and is removed while being carried out along the inclined surface of the washing device, thereby cleaning iron.

However, even with this type of device, the sludge removal effect cannot be expected to be very effective because the settled sludge that has settled at the bottom of the water washing device is collected and carried out along with iron by the scraper conveyor. That is, the iron washed by the above method still contains a considerable amount of sludge and the like, which requires further washing work and increases the recovery cost.

In addition, in the above-mentioned water washing equipment, iron is often caught between the multiple scrapers attached to the conveyor and the bottom of the equipment, making the conveyor unable to operate, making the iron collection work unstable. It was. Furthermore, when inspecting or repairing the washing equipment (particularly the scraper conveyor part), washing water containing sludge (hereinafter referred to as "sewage") is sprayed around the washing equipment, which can cause pollution.

The inventor of the present invention has focused on the above-mentioned circumstances and has conducted intensive research with the aim of developing a device that can efficiently recover high-quality iron at low cost and without the risk of causing pollution. As a result, water was sprayed on the iron in the pit collected by the dry method to clean it, and
We learned that if we efficiently treat the sewage produced by this cleaning (hereinafter referred to as ``cleaning sewage'') and reuse the treated water as water for the above-mentioned iron cleaning, we could successfully achieve this goal, and finally developed the present invention. It was completed.

In other words, the configuration of the iron recovery processing device according to the present invention is that the iron recovery device collects iron in combustion residue discharged from an incinerator using a magnetic separator, and then washes it in an iron pit to recover the iron. Following the pit, an ash pit, an ash sewage settling pit, and a sewage pit are connected in this order, and drainboards are provided at the joints between the iron pit and the ash pit, and between the ash pit and the ash sewage settling pit. Further, the gist lies in that an overflow communication port is provided at the joint between the ash sewage settling pit and the sewage pit, and a cleaning nozzle is further provided in the upper part of the side wall of the iron pit.

The configuration and effects of the present invention will be explained below based on the drawings which are examples, but the following are only representative examples, and the design can be changed as appropriate in accordance with the spirit of the above and below. All of these are included within the technical scope of the present invention.

FIG. 1 is a partially cutaway schematic diagram illustrating the iron recovery device according to the present invention, in which the iron content A 1 in the combustion residue A sent by the dry residue conveyor 1 is shown in FIG _.
is collected by a magnetic separator 2 placed on the upper part of the conveyor 1, passed through a chute 3, and thrown into the iron pit 4 in the iron recovery processing device 20. The ash is put into the ash pit 6 in the device 20.

The iron recovery device 20 includes an iron pit 4, an ash pit 6, an ash sewage settling pit 7, and a sewage pit 8 connected in series. Further, each pit is divided by partition walls 14, 15 and 16. A drainboard 17 is attached to a passage 14a provided on the bottom side of the partition wall 14, a drainboard 18 is also attached to a passage 15a provided at the bottom of the ash pit of the partition wall 15, and further, a drainboard 18 is attached to the partition wall 16. An overflow communication port 16a is provided in a range that does not exceed the height of the passage 15a. Also, sewage pit 8
A pump 9 is installed inside, and a discharge pipe 9
The pumping pipe 9b connected to a is connected to an adjacent sewage treatment chamber 10. Furthermore, a plurality of (four in the figure) cleaning nozzles 1 are installed on the upper part of the inner peripheral wall of the iron pit 4.
1a, 11b... (represented by 11 below), and the cleaning nozzle 11 is connected to a branch pipe 12.
a, 12b, .

Now, as mentioned above, if a certain amount of iron A ₁ in the combustion residue A is put into the iron pit 4, and a certain amount of the combustion residue A from which the iron content A ₁ has been removed is put into the ash pit 6, the combustion residue can be carried out. The conveyor 1, magnetic separator 2, and discharge conveyor 5 are temporarily stopped, and the cleaning nozzle 11
Spray water for a certain period of time. While the sprayed water moves through the accumulated iron, it washes out combustion residues that have adhered to or mixed in the iron. Since the water used for spraying has been treated in the sewage treatment chamber 10, which will be described later, the washed iron is in an extremely clean state, and therefore can be recovered as high-quality iron with good regeneration efficiency. Ru.

On the other hand, the water that has been washed passes through the drainboard 17 and enters the ash pit 6 as so-called washing wastewater containing combustion residue. While the washed sewage flows through the ash pit 6 and heads to the ash sewage settling pit 7, it is filtered by the accumulated combustion residue, and as a result,
Washed wastewater from which crude combustion residues have been removed passes through the drainboard 18 and flows into the ash wastewater settling pit 7.

The washing wastewater flowing into the ash wastewater and grit pit 7 is naturally separated over time into settled sludge, settled sand and supernatant wastewater. The supernatant wastewater then overflows through the communication port 16a and flows down into the wastewater pit 8 where it is stored.

Further, the wastewater stored in the wastewater pit 8 is pumped up by a pump 9 and introduced into the wastewater treatment chamber 10. Treated water that has been subjected to a certain level of treatment in the sewage treatment chamber 10 is supplied to washing water containing iron A ₁ via a water supply pipe 13, a branch pipe 12, and a washing nozzle 11.

The washed iron in the iron pit 4, the combustion residue in the ash pit 6, and the settled sludge and sand in the ash sewage settling pit 7 are all periodically removed by a crane (not shown) above each pit. It is designed to be transported to

Since the present invention is constructed as outlined above, high-quality iron with a high degree of regeneration can be recovered efficiently using a simple mechanism and without worrying about pollution.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway schematic diagram illustrating the iron recovery device of the present invention. A... Combustion residue, A ₁ ... Iron content, 1... Combustion residue conveyor, 2... Magnetic separator, 3... Chute, 4... Iron pit, 6... Ash pit, 7... Ash sewage settling, 8...Sewage pit, 9...Sumpling pump, 10...Sewage treatment room, 11...Washing nozzle,
14, 15, 16... Partition wall, 20... Iron recovery processing device.

Claims (1)

[Scope of utility model registration request] In an iron recovery device that collects iron in combustion residue discharged from an incinerator using a magnetic separator and then washes it with water in an iron pit, the iron pit is followed by an ash pit, an ash sewage settling pit, and a sewage pit. They are connected in this order, and drainboards are provided at the joints of the iron pit and the ash pit, and between the ash pit and the ash sewage settling pit, and at the joint of the ash sewage settling pit and the sewage pit. An apparatus for recovering iron in combustion residue, characterized in that an overflow communication port is provided, and a cleaning nozzle is further provided on the upper side wall of the iron pit.