CN102958627A

CN102958627A - Method and system for treating hazardous materials that have been generated in foundry line

Info

Publication number: CN102958627A
Application number: CN2011800317730A
Authority: CN
Inventors: 铃木真希; 天野宽之
Original assignee: Sintokogio Ltd
Current assignee: Sintokogio Ltd
Priority date: 2010-07-27
Filing date: 2011-07-05
Publication date: 2013-03-06
Also published as: JP2012024826A; BR112012033401A2; JP5435364B2; WO2012014383A1

Abstract

A method and a system for treating hazardous materials by insolubilizing the hazardous materials, such as heavy metals and halogen that are contained in collected dust are provided. Only a small facility must be added to a foundry line. The foundry line reuses molding sand by performing the steps of shaking out a casting (14), reclaiming the molding sand (11), and mulling the sand (10). The collected dust that has been generated in the foundry line is transported to the step of mulling the sand to mull the molding sand with the dust and an insolubilizing agent. Thus the hazardous materials are insolubilized. Since no facility for insolubilizing the hazardous materials is required, the cost for facilities can be reduced. Further, if the treated sand is reused for a raw material for cement or a roadbed, no hazardous materials elute.

Description

Method and system for the treatment of the harmful substance that in foudry line, has produced

Technical field

The present invention relates to the method and system for the treatment of harmful substance.Particularly, the present invention relates to collect from the contained harmful substance of the dust of foudry line such as heavy metal and the halogen method and system of dissolving not for making.

Background technology

Usually, used sand is used as moulding and reuses with material after predetermined process in casting.Comprise the dust of collection and sand to be disposed and again be used as cement or roadbed material.Yet, owing to recently the requirement of cleaning ambient (as to soil) is improved, thereby produced not that the demand of dissolving processing enters in the soil to prevent heavy metal such as cadmium, Cr VI, mercury, selenium, lead, arsenic and boron and halogen such as fluorine wash-out.

As the example to the not dissolving processing of these harmful substances, the open 2005-324083 of Japanese Patent Laid discloses a kind of not dissolving processing method, wherein add in the soil of being crossed by fluoride pollution and contain magnesia as the additive of key component, then mix.

Summary of the invention

In order to make not dissolving of harmful substance by foudry line being used this processing, the device 1 for not dissolving processing must be installed as shown in Figure 2.Described harmful substance comprises heavy metal and halogen, and is included in the dust of collection.Therefore, the cost that is used for device increases, and needs in addition to be used for by this processing the not used space of the equipment of dissolving.These have become problem.

The object of the present invention is to provide a kind of method and system of the harmful substance for the treatment of in foudry line, having produced.Described method and system need to be except foudry line any extra device.Only need to add little device to foudry line.By described method and system, can make not dissolving of the harmful substance that contains in the dust of collection such as heavy metal and halogen.Thereby the cost that is used for device can be reduced, and need not the used large space of device.

For realizing this purpose, the method for the harmful substance for the treatment of having produced in foudry line of the present invention is the not method of dissolving of harmful substance contained in a kind of dust of the collection for foudry line is produced.Foudry line carries out following steps: make casting falling sand after poured with molten metal is in casting mold, the molding sand that recovery discharges by casting falling sand, and with the molding sand through reclaiming at least with original sand (green sand) thereby and insoluble solution agent mix the sand through mixing be fed to the moulding machine that is used to form casting mold.Molding sand is reused.In these steps one of at least and the dust of the collection that produces of the supplying step between these steps be transported to the step of the sand that mixes.There, molding sand is mixed with dust and insoluble solution agent.Thereby, make not dissolving of harmful substance.

In the step of sand of mixing, can make molding sand.Harmful substance comprise in cadmium and compound, hexavalent chromium compound, cyanogen compound, mercury and mercuric compounds, methyl seleninic acid, lead and compound thereof, arsenic and compound thereof, fluorine and compound thereof and boron and the compound thereof one of at least.These materials comprise cadmium, Cr VI, mercury, selenium, lead, arsenic, fluorine or boron.They must be removed from soil, contaminated to prevent soil.

For realizing this purpose, the system of the harmful substance for the treatment of having produced in foudry line of the present invention is a kind of for making the not system of dissolving of harmful substance contained in the dust of making the collection that foudry line that foundry goods uses produces.Foudry line is included in and will be used for the device of casting falling sand after poured with molten metal is in casting mold, be used for to reclaim the device of the molding sand that discharges from the device that is used for casting falling sand, thereby and be used for making molding sand through reclaiming to mix with original sand and insoluble solution agent at least the sand through mixing is fed to device for the moulding machine of moulding.Described system comprises that foudry line and the dust that is used for collecting are delivered to the device be used to the device of the sand that mixes.Described device be used to the sand that mixes comprises for the device that adds the dust of insoluble solution agent and collection to molding sand.

By the present invention, the dust of the collection that has produced in foudry line is transported to the device be used to the molding sand that mixes.By being mixed with dust and insoluble solution agent, molding sand makes not dissolving of described dust.Thereby need not for the contained harmful substance of the dust that makes collection such as heavy metal and the halogen special equipment of dissolving not.Can reduce thus the cost for device, and need not the large space for device.If the raw material that the molding sand that will process through method of the present invention or system is used as cement or roadbed again then can not elute harmful substance, and avoid any pollution to soil.

The basic Japanese patent application 2010-167793 that on July 27th, 2010 submitted to incorporates among the application by quoting in full mode at this.

To understand more all sidedly the present invention by detailed description given below.Yet this detailed description and specific embodiments are the explanations to the favourable embodiment of the present invention, and only are used for explaining.On the basis of describing in detail, various possible variations and modification will be obvious for those of ordinary skill in the art.

The Applicant none is intended to contribute any disclosed embodiment to the public.Therefore, among disclosed variation and revising, may not falling into the variation in the claim scope of the present invention and revise on the meaning of doctrine of equivalents on literal, those have consisted of a part of the present invention.

Singulative and similar statement used in specification and claim should be interpreted as encompasses singular form and plural form, unless be otherwise noted in this article or obviously contradict with context.The use of any and whole examples that provide herein or exemplary language (for example " such as ") only be intended to illustrate better the present invention, and be not that scope of the present invention is limited, except as otherwise noted.

Description of drawings

Fig. 1 is the flow chart of the step of explanation embodiment of the present invention.

Fig. 2 is the flow chart of explanation conventional embodiment step.

Preferred forms of the present invention

Hereinafter, with reference to Fig. 1 embodiment of the present invention are described.In the foudry line flow chart of Fig. 1, numeral 10 expressions the mix step of molding sand of the device of sand that utilize to be used for mixing.In the step of sand of mixing, will certainly reclaim molding sand that the step 11 of molding sand transports and mix to obtain sand through mixing with original sand and other material, described sand through mixing is ready to use in the formation casting mold.Described other material is adhesive such as clay and resin.The molding sand that utilizes the water of scheduled volume to mix is transported to step of overall modelling 12.In step of overall modelling 12, by forming casting mold with molding sand.In the cast step 13 below, motlten metal is poured in the casting mold.Thereby foundry goods is made.

After cast step 13, with casting mold cooling and be delivered to casting falling sand step 14.At the device that is used for casting falling sand, foundry goods separates with molding sand.Separated sand is transported to the step 11 that reclaims molding sand.Be used for to reclaim the device of sand, molding sand is recovered, and, removes ironware by the magnetic sorting device that is, removes adhesive from the surface of sand particle, filters fine grained, and by sand cooler with sand cooling but.By casting falling sand step 14, recovery sand step 11 and the sand step 10 of mixing, consisted of the step of recycling molding sand.

The sand that adheres on the surface of the foundry goods that takes out in casting falling sand step 14 removes by cleaning foundry goods step 15.Sand through removing is transported to the step 11 that reclaims sand.After the removing surface step 16 of foundry goods is finished with inspection foundry goods step 17, transport the foundry goods that is removed sand by cleaning foundry goods step 15.

In foudry line, produced the dust that contains harmful substance such as heavy metal and halogen.Therefore dust collects by dust arrester 20.Dust is created in the middle of each of above-mentioned those steps and in the supplying step between the described step.Wherein, a large amount of dust result from the step 14 of casting falling sand and reclaim in the step 11 of sand.Therefore, these two steps one of at least in collect dust.

Usually, the dust of being collected by dust arrester 20 comprises at least a harmful substance such as cadmium, Cr VI, mercury, selenium, lead, arsenic, fluorine, boron and contains the compound of one of these materials.These harmful substances must be removed to prevent that soil is contaminated.By the present invention, the dust that contains the collection of these harmful substances is transported to the sand step 10 of mixing by the device 21 (such as conveyor type machine and pipeline) for delivery of dust.Preferably seal for delivery of the device 21 of dust, preventing dust disperse in the process of carrying.

In the sand step 10 of mixing, by being used for adding the device of insoluble solution agent with the dust adding molding sand of insoluble solution agent and collection.Insoluble solution agent can comprise magnesia, contains magnesian reagent and iron chloride, calcium chloride, alkali silicate, calcium oxide and calcium aluminate or calcium chlorate and calcium silicates.

About the processing of the not dissolving that is used for making fluorine and compound and boron and compound thereof, one of measure of polluting as Antagonistic Environment, strict restriction is eluted to license amount in the soil with these materials.Magnesia is suitable as and makes the not insoluble solution agent of dissolving of these materials.In this embodiment, use the insoluble solution agent of pulverous magnesia.Preferably be designed to from the insoluble solution agent of storage supply constant basis for the device that adds insoluble solution agent.

The dust that by this way, will contain the collection of harmful substance is delivered to the sand step 10 of mixing.There, molding sand is mixed with dust and the insoluble solution agent of collection.Thereby the reaction of harmful substance and insoluble solution agent is fixed on insoluble state thus.They can not advance in the molding sand by wash-out.The molding sand of having been processed by above-mentioned processing can be used to form casting mold, and need not any further processing.In addition, if sand is reserved as cement or reuses for the raw-material antiquated sand of roadbed, it can not cause polluting in soil environment.

By the present invention, the dust that only need be used for collecting is delivered to the device 21 of the sand step 10 of mixing and is added into existing foudry line for the device that adds insoluble solution agent, and described foudry line is equipped with dust arrester.Do not need be used to making the not device of dissolving of sand.Thereby the cost that is used for device can be very low.In addition, do not need be used to making the not used space of device of dissolving of sand.

Claims

One kind by the harmful substance in the dust that makes the collection that in foudry line, has produced not dissolving process the method for described harmful substance, wherein said foudry line is reused molding sand by carrying out following steps:

After poured with molten metal is in casting mold, make casting falling sand;

Be recovered in the described molding sand that is released after the casting falling sand step; With

By coming mixing described sand with the mix step of the described molding sand that has been recovered of original sand and insoluble solution agent at least, thereby the sand through mixing is fed to moulding machine, described sand through mixing is used to form casting mold;

It is characterized in that the dust of the described collection that produces in the step of the conveying sand in each described step or between described step is transported to the step of the sand that mixes, described molding sand is mixed with the dust that is transferred and described insoluble solution agent therein.
2. method claimed in claim 1, wherein said molding sand makes in the step of the described sand that mixes.
3. method claimed in claim 1, wherein said harmful substance comprise in cadmium and compound, chromic compound, cyanogen compound, mercury and mercuric compounds, methyl seleninic acid, lead and compound, arsenic and compound thereof, fluorine and compound thereof and boron and the compound thereof one of at least.
One kind by the harmful substance in the dust that makes the collection that in making the foudry line of foundry goods, has produced not dissolving process the system of described harmful substance, wherein said foudry line comprises:

The device of casting falling sand will be used for after poured with molten metal is in casting mold;

Be used for to reclaim from the device of the described molding sand that discharges for the device of casting falling sand; With

The device of the described molding sand that reclaimed by described device is used for mixing, thereby the device that should be used for mixing is used for that described sand is mixed with original sand and insoluble solution agent at least is fed to moulding machine with the sand through mixing, and described sand through mixing is used to form casting mold;

It is characterized in that described system comprises described foudry line and be used for dust with described collection and be delivered to device be used to the device of the sand that mixes, and

Described device be used to the sand that mixes comprises for the device that adds the dust of described insoluble solution agent and described collection to described molding sand.