KR101135962B1 - Radioactive Ray Shield Block - Google Patents

Abstract

The present invention relates to a radiation shielding block and a manufacturing method thereof, the radiation shielding block is characterized in that consisting of 80 to 86 parts by weight of iron components, 13.7 to 19.5 parts by weight coagulation composition, 0.3 to 0.5 parts by weight of admixtures, (A) separating the shielding iron component from the foundry sand; (b) mixing the iron component and the coagulation composition; (c) injecting the mixed mixture into the mold; (d) defoaming and compressing the mixture in the mold using a vibrator; And (e) drying and curing the mixture passed through step (d). It can be prepared as.
According to the present invention, the iron and silica components are separated from the waste foundry sand used in the casting process and recycled as raw materials of the radiation shielding block, thereby saving resources and reducing costs through waste disposal. It has a preventive effect.

Description

Radiation shielding block and its manufacturing method {Radioactive Ray Shield Block}

The present invention relates to a radiation shielding block and a method for manufacturing the same, and more particularly, to separate the iron component and silica component contained in the waste foundry sand to be used as a raw material of the radiation shielding block and its manufacturing method It is about.

In general, the casting method forms a molten metal by heating the metal to a melting point temperature, and then, the molten metal is poured into a mold formed in the same shape as the product to be manufactured, and the molten metal is poured into the mold. As a method of manufacturing casting products by cooling and solidifying, it occupies an important field of metal processing method together with plastic processing, powder metallurgy and welding.

Most widely used as a material for a mold serving as a mold in the casting method described above is a casting sand mainly composed of silica sand having excellent fire resistance, and is a known binder in sand having a particle size of about 20 to 70 mesh. 4 ~ 8% of clay and 2 ~ 6% of water are added to make the molding sand for molding, and the molding sand made in this way is put into the casting mold with a circular pattern to solidify it. One divided mold is then completed.

When the casting product is cast using the mold manufactured as described above, the binder is carbonized and hardened on the surface of each casting sand by the high temperature of the molten metal, and the waste casting sand having the carbonized curing binder is attached separately. If it is used immediately in the next casting without treatment of the casting sand, there are factors that adversely affect the casting products, such as the decrease in the binding force between the molding sand and the breathability of the mold, so that the removal of the binder attached to the surface of the waste casting sand to a certain purity The foundry sand is recycled into a foundry sand with a new die, or a new foundry sand is used after disposal.

Today, due to the development of the industry, as the production of castings increases rapidly, studies are being actively conducted to industrially use the waste foundry sand which was simply disposed of.

In particular, attempts are being made to use such waste foundry sand as a building material, and when used as concrete aggregate, rust may occur due to the iron contained in the foundry sand, or whitening and oxidation of concrete structures may occur. There was a problem.

An object of the present invention devised to solve the above-mentioned problems of the prior art is to recycle iron as a raw material for manufacturing a radiation shielding block by separating an iron component and a silica component from waste foundry sand used after being used in a casting process.

The object of the present invention can be achieved through a radiation shielding block, characterized in that consisting of 80 to 86 parts by weight of iron components, 13.7 to 19.5 parts by weight of the coagulation composition, 0.3 to 0.5 parts by weight of admixtures.

At this time, the admixture is characterized in that it contains a high fluidizing agent, an air entrainer and a thickener.

And, the object of the present invention (a) separating the shielding iron component from the foundry sand; (b) mixing the iron component and the coagulation composition; (c) injecting the mixed mixture into the mold; (d) defoaming and compressing the mixture in the mold using a vibrator; And (e) drying and curing the mixture passed through step (d). It can also be achieved through a method for manufacturing a radiation shielding block comprising a.

Here, the step (a) is to remove the foreign matter contained in the (a-1) molding sand; (a-2) injecting the purified foundry sand into a hopper; (a-3) transferring the foundry sand put into the hopper to a conveyor; (a-4) removing the moisture by passing the transferred molding sand through a dryer; (a-5) firstly discriminating the iron component from the dried foundry sand using magnetic force; (a-6) pulverizing the primary magnetically selected and left casting sand into a ball mill; And (a-7) collecting the powdered powder pulverized by the ball mill with a cyclone and storing it between the secondary powder and the secondary gravity separation of the iron powder and the iron component.

And, the drying temperature of the step (a-4) is preferably 80 ~ 100 ℃.

In addition, the powder of the cyclone dust-collected molding powder of step (a-7) is characterized in that more than 6,000 cm 2 / g.

And, the particle size specification of the secondary specific gravity-selected iron component of step (a-7) is characterized in that less than 3mm.

In addition, the step (b) is characterized in that mixing 80 to 86 parts by weight of iron components, 13.7 to 19.5 parts by weight of the coagulation composition, 0.3 to 0.5 parts by weight admixture.

At this time, the admixture is characterized in that consisting of a high fluidizing agent, an air entrainer and a thickener.

According to the present invention, the iron and silica components are separated from the waste foundry sand used in the casting process and recycled as raw materials of the radiation shielding block, thereby saving resources and reducing costs through waste disposal. It has a preventive effect.

1 is a flow chart for explaining the manufacturing process of the radiation shielding block according to the present invention.
Figure 2 is a flow chart for explaining the separation process of the foundry sand according to the present invention.
3 is a perspective view illustrating a shielding block according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is used to produce a radiation shielding block by separating the iron component and the silica component from the waste foundry sand after being used in the casting process.

The casting sand is to form a mold for casting a shape by pouring the elected to melt at a temperature of 1,500 ℃ or more in a blast furnace, such as a casting factory, the residue of pig iron remains during the casting operation.

At this time, if you look at the components of the foundry sand waste to play the role of the mold and discarded can be confirmed in Table 1 below consisting of 84% SiO2, 3% Al2O3, Fe 12.6%, CaO 0.29%, MgO 0.05%.

<Table 1>

A method of manufacturing the radiation shielding block by recycling the foundry sand will be described with reference to FIGS. 2 and 3.

The manufacturing process of the shielding block of the present invention, first, as shown in Figure 2 (a) performs a step of separating the shielding iron component from the molding sand. (S10)

Then, the step of mixing the iron component and the coagulant composition separated from the foundry sand is carried out.

In this case, the mixing step may be composed of one step of measuring and mixing the coagulant and two steps of measuring and mixing water after the first step of mixing.

Here, the mixing mixture may be composed of 80 to 86 parts by weight of iron components, 13.7 to 19.5 parts by weight of the coagulation composition, 0.3 to 0.5 parts by weight of admixtures.

In this case, the admixture may include a high fluidizing agent, an air entrainer, and a thickener.

In addition, the coagulation composition may be composed of 31 to 40 parts by weight of cement, 30 to 35 parts by weight of fly ash, 15 to 20 parts by weight of blast furnace slag, 10 to 15 parts by weight of cast sand powder, and 5 to 8 parts by weight of limestone powder.

Next, after (c) performing the step of injecting the mixed mixture into the mold (S30), (d) performing a step of removing bubbles and compressing the mixture in the mold using a vibrator (S40).

(e) The mixture which has undergone the bubble removal and compression step may be dried and cured (S50) to complete the radiation shielding block 100.

The most important process in manufacturing the radiation shielding block 100 as described above is a process of separating the iron component and the silica component in the foundry sand. The process of separating the iron component and the silica component from the foundry sand with reference to the accompanying Figure 2 will be described.

2 is a flowchart illustrating a separation process of the foundry sand according to the present invention.

For the molding sand separation process of the present invention as shown in the drawing, first, the step (a-1) is carried out to remove the foreign matter contained in the molding sand. (S11) At this time the foreign matter can be directly screened and removed by the operator visually. have.

Then, (a-2) the purified foundry sand is put into the hopper. (S11)

Thereafter, (a-3) the foundry sand injected into the hopper is transferred to the dryer through a conveyor. (S12)

At this time, the hopper is provided with a fixed amount feeder, it is possible to be put after the quantitative measurement of the foundry sand put into the conveyor.

Then, (a-4) the foundry sand put into the conveyor is transferred to the dryer to be removed through the drying step. (S13) At this time, the drying temperature is preferably 80 ~ 100 ℃. At this time, the dryer is made of a configuration including a burner using refined oil, such a dryer is to dry the moisture content of the foundry sand within 1%.

Next, (a-5) the iron component is firstly discriminated from the dried foundry sand using magnetic force. The magnet is separated by adsorbing only the iron component when the casting sand falls.

Then, (a-6) performs the step of crushing the primary magnetic force selected and remaining casting sand to the ball mill (S15).

Then, (a-7) the foundry powder pulverized by the ball mill is collected by a cyclone and stored in between, so that the foundry powder and the iron component are subjected to secondary specific gravity selection (S16).

At this time, the powder degree of the cyclone collected dust powder is preferably 6,000 cm 2 / g or more.

In addition, the particle size specification of the second specific gravity selected iron component is preferably 3mm or less.

The cyclone may be composed of a pulverizer for crushing the molding sand to 6,000 cm 2 / g or more, and a dust collector for sucking the pulverized molding sand fine powder.

At this time, the fine molding sand powder may be discharged to the upper part through the dust collector, and the powder having a high specific gravity and below the average particle size may be recycled to the refiner through the lower part.

The refiner may allow the finely divided powder sand to be discharged through the dust collector, and the powder remaining without being sucked into the conveyor may be subjected to magnetic separation.

<Table 2> and <Table 3> show the results of the measurement of the iron component and the particle size measurement of the iron component in the primary and secondary separations.

<Table 2>

<Table 3>

As shown in Table 2 and Table 3, the content of the iron component selected by recycling by ball milling and recycling is higher than that of magnetic screening, and it can be seen that the particle size is also fine powder.

<Table 4> is a table showing the results of the strength test when manufacturing the shielding block specimens according to the mixing ratio and curing period of the iron component.

<Table 4>

As shown in Table 4, the shielding block of the present invention shows the difference between the strength ratio of the shielding block according to the mixing ratio and curing period of the iron component, the higher the distribution of low particle size, the higher the curing period You can see that.

Here, the shielding block 100 of the present invention shown through FIG. 3 may be manufactured to have a structure suitable for stacking walls by forming a male and female coupling structure in upper and lower portions. Of course, the shape or size is not specified, it can be changed freely.

According to the present invention, the iron and silica components are separated from the waste foundry sand used in the casting process and recycled as raw materials of the radiation shielding block, thereby saving resources and reducing costs through waste disposal. It has a preventive effect.

100: shielding block

Claims (9)

delete delete delete (a) separating the shielding iron component from the foundry sand;
(b) mixing the iron component and the coagulation formulation;
(c) injecting the mixed mixture into the mold;
(d) defoaming and compressing the mixture in the mold using a vibrator; And
(e) drying and curing the mixture passed through step (d);
The step (a)
(a-1) removing the foreign matter contained in the foundry sand;
(a-2) injecting the purified foundry sand into a hopper;
(a-3) transferring the foundry sand put into the hopper to a conveyor;
(a-4) removing the moisture by passing the transferred molding sand through a dryer;
(a-5) firstly discriminating the iron component from the dried foundry sand using magnetic force;
(a-6) pulverizing the primary magnetically selected and left casting sand into a ball mill; And
(a-7) secondary gravity-selecting the foundry powder and the iron component by collecting the powdered powder pulverized by the ball mill with a cyclone and storing it in a path;
Radiation shielding block manufacturing method comprising a.
The method of claim 4, wherein
The drying temperature of the step (a-4) is a method of manufacturing a radiation shielding block, characterized in that 80 ~ 100 ℃.
The method of claim 4, wherein
Method for producing a radiation shielding block, characterized in that the powder degree of the cyclone-collected foundry powder of step (a-7) is 6,000 cm 2 / g or more.
The method of claim 4, wherein
The particle size specification of the secondary specific gravity-selected iron component of step (a-7) is 3mm or less, characterized in that the manufacturing method.
The method of claim 4, wherein
The step (b) is 80 to 86 parts by weight of the iron component, 13.7 to 19.5 parts by weight of the coagulation composition, 0.3 to 0.5 parts by weight of admixtures, mixing and mixing of the radiation shielding block manufacturing method.
The method of claim 8,
The admixture is a radiation shielding block manufacturing method, characterized in that consisting of a high fluidizing agent, an air entrainer and a thickener.

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