JPS594197B2 - Waste melting and solidification processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for melting and solidifying waste generated from waste incineration equipment or steel-making furnaces, and to an apparatus for efficiently detoxifying harmful dust in exhaust gas generated during the melting.

As the times progress, consumer lifestyles change and production activities expand or diversify, resulting in the production of enormous amounts of waste.

Of this huge amount of waste, what could be incinerated was incinerated, and the rest was disposed of in landfills. As a result, bad odor and
While secondary pollution occurs, such as the generation of dust and sewage, or the elution and diffusion of hazardous substances into groundwater, in recent years, restrictions on landfill sites have created new problems.

Therefore, in order to avoid the above-mentioned secondary pollution, a method of melting and solidifying waste has been developed to prevent the elution of harmful substances and reduce the volume.

In other words, in this melt-solidification treatment method, waste is melted in a melting furnace, then cooled and solidified to form a slag, which seals in harmful substances and reduces the volume by melting. When the waste is melted in this melting furnace, the material to be treated is heated above its melting point, so some of the metal in the material is evaporated (hereinafter referred to as volatilization).

) It is carried away with the exhaust gas from the melting furnace and collected in a dust collector. Generally, the more harmful the metal is to the human body, the greater the tendency for it to volatilize, and therefore the dust collected by a dust collector needs to be treated. Conventionally, such collected dust ash has been disposed of by being packed into a drum, or solidified with asphalt or cement, and then dumped as is.

However, with the former method, securing a disposal site is still a problem, and with the latter method, the elution of harmful substances over time cannot be avoided, and the problem of secondary pollution cannot be avoided. In addition, there are methods to solve this secondary pollution problem, such as containment with plastic or containment in smelting slag, but in order to perform these treatments, separate processing equipment is required in addition to the melting and solidification equipment. This required a huge amount of equipment cost and was not always satisfactory.

The present invention was made in view of these circumstances, and aims to provide a waste melting and solidifying treatment device that completely solves the secondary pollution problem without requiring special treatment equipment. be.

That is, the present invention collects volatilized harmful substances contained in the exhaust gas generated from the melting furnace with a dust collector, and injects the collected harmful substances into the molten slag taken out from the melting furnace and melts them. It is characterized by being melted and solidified together with the slag.

Hereinafter, details of the present invention will be explained with reference to embodiments shown in the drawings.

In the figure, numeral 3 serves as a melting furnace, and includes an inlet 2 for a material to be treated, an outlet 10 for taking out molten slag, and an outlet 14 for exhaust gas generated from the melting furnace 3.

4 is a dust collector, 5 is a harmful gas removal device, and melting furnace 3
In addition to removing dust from the exhaust gas discharged from the chimney 6, harmful gases are also removed and released into the atmosphere from the chimney 6.

? is a dust collection hood provided above the solidification device 8, and is designed to suck in dust coming out from the solidification device 8. In this embodiment configured as described above, the workpiece 1 is charged into the melting furnace 3 through the input port 2 and melted.

In this melting process, the object to be treated is heated to a high temperature above its melting point, so that a part of the metal contained in the object is volatilized and discharged from the outlet 14 together with the exhaust gas. Incidentally, the results of analyzing this exhaust gas were as shown in Attached Table 1.

The exhaust gas discharged in this way is guided to the dust collector 4 through the exhaust gas conduit 11, and the dust in the exhaust gas is collected.

Next, the collected dust ash is fed into the solidifying device 8 together with the molten slag taken out from the outlet 10 and solidified. Dust or volatilized harmful substances generated by the solidification device 8 are sucked into the dust collection hood 7 and collected together with the dust in the exhaust gas by the dust collection bag.

The thus solidified slag 9 is reduced in volume while containing harmful substances, and is then dumped as is. The results of testing the slag solidified in this way in accordance with the provisions of Environmental Agency Public Notice No. 13, which processes the slag into particles of a certain size, soaks them in water for a certain period of time, and tests the aqueous solution to determine whether or not it has leached out. The results shown in Attached Table 2 were obtained. As a result, we were able to obtain results that were below the criteria for hazardous substances and industrial waste, as stipulated in Prime Minister's Office Ordinance No. 5.

As detailed above, according to the present invention, the collected dust ash collected by the dust collector is put into the solidification device together with the molten slag, and is solidified while being melted, so that there is almost no elution of harmful substances and the volume is reduced. We provide waste melting and solidification processing equipment that can completely prevent secondary pollution without requiring special processing equipment to process collected dust ash, and does not require special equipment costs. There are many industrial advantages that can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of the present invention, which is shown in a system diagram. 3... Melting furnace, 4... Dust collector, 5...
... Harmful gas removal device, 7 ... Dust collection hood, 8 ... Solidification device, 9 ... Solidified slag.

Claims (1)

[Claims] 1 After removing dust from the exhaust gas generated from the melting furnace using a dust collector,
While dissipating from the chimney through a harmful gas removal device, the dust collected by the dust collector is thrown into the molten slag coming out of the melting furnace, and the dust collector is solidified with the molten slag by a solidification device. Equipment for melting and solidifying things.