KR20200109699A - Method for eliminating iron content of molding sand - Google Patents

Method for eliminating iron content of molding sand Download PDF

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KR20200109699A
KR20200109699A KR1020190029150A KR20190029150A KR20200109699A KR 20200109699 A KR20200109699 A KR 20200109699A KR 1020190029150 A KR1020190029150 A KR 1020190029150A KR 20190029150 A KR20190029150 A KR 20190029150A KR 20200109699 A KR20200109699 A KR 20200109699A
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iron
sand
acid
molding sand
magnet
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KR1020190029150A
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Korean (ko)
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KR102192075B1 (en
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박서영
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박서영
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/18—Plants for preparing mould materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying

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  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

According to the present invention, disclosed is a method for removing iron content from molding sand comprising: a first step of removing iron remaining in the molding sand by magnetic force; a second step of treating with an acid to secondarily remove the fine iron powder of the molding sand from which the iron powder was first removed; a third step of neutralizing the acid-treated molding sand; and a fourth step of washing the neutralized molding sand. According to the present invention, by removing fine iron powder by a chemical method after the first removal of iron with large particles contained in the molding sand by a physical method, there is an effect of being able to derive excellent results when manufacturing high-precision metals such as titanium capable of being used for human body.

Description

주물사의 철분제거 방법 {METHOD FOR ELIMINATING IRON CONTENT OF MOLDING SAND}How to remove iron from foundry {METHOD FOR ELIMINATING IRON CONTENT OF MOLDING SAND}

본 발명은 주물사의 철분제거 방법에 관한 것으로, 더욱 상세하게는 주물사에 잔재된 미세 철분까지 제거 가능한 철분제거 방법에 관한 것이다.The present invention relates to a method for removing iron content from foundry sand, and more particularly, to a method for removing iron content capable of removing even fine iron remaining in the foundry sand.

일반적으로 주물공장 등 철을 다루는 각종의 산업현장에서 주형을 만들기 위하여 사용하는 모래인 주물사가 사용되고 있다. 이러한 주물사는 강도, 내화성이 높고 통기성이 좋으며 성형성이 풍부하고 염가일 것이 요구된다.In general, foundry sand, which is sand used to make molds, is used in various industrial sites dealing with iron such as foundry factories. These castings are required to have high strength, fire resistance, good ventilation, rich in moldability, and low cost.

주물사는 석영입자가 대부분이며, 장석과 점토를 소량 포함하고 있다. 채취되는 장소에 따라 산모래, 개울모래, 해변모래 라고 한다. 점토는 모래알을 결합하는 구실을 하는데, 산모래에 많으며 개울모래, 해변모래에는 적다. 석영을 포함한 것은 내화성이 풍부하다. 석영이 특히 많은 것을 규사라고 하며, 주로 주강에 사용한다. 주물사는 그 성질로 보아 내화성, 통기성, 성형성이 좋아야 한다. Foundry sand is mostly made of quartz particles, and contains small amounts of feldspar and clay. It is called mountain sand, creek sand, and beach sand depending on where it is collected. Clay plays a role in combining sand grains, many in mountain sand and little in creek sand and beach sand. Those containing quartz are rich in fire resistance. Particularly large amounts of quartz are called quartz sand, and are mainly used for cast steel. Casting sand should have good fire resistance, breathability, and moldability in view of its properties.

입자가 미세하고 점토분이 많은 것을 사용했을 때 그 형의 강도가 크고, 입자의 모양이 둥근 것일수록 성형성이 좋다. 입자가 거칠고 입자의 모양이 둥글며 점토분이 적은 것은 통기성이 좋다. 천연적으로 채취할 수 있는 한 종류의 모래만으로는 적응성이 좋지않기 때문에 보통 몇 가지의 모래를 섞어서 사용한다.When fine particles and a lot of clay are used, the strength of the mold is high, and the shape of the particles is round, the better the moldability. If the particle is coarse, the shape of the particle is round, and the clay content is low, the ventilation is good. Since it is not adaptable to only one type of sand that can be harvested naturally, it is usually mixed with several types of sand.

한편, 주물사는 철분을 제거한 상태로 공급되지만 잔재된 철분을 제거하기 위한 주물사에 포함된 철분의 제거가 요구되며, 이와 같이 철분 제거와 관련된 기술이 한국등록실용신안 제0362736호에 제안된 바 있다.On the other hand, the foundry sand is supplied in the state of removing the iron content, but it is required to remove the iron contained in the foundry sand to remove the remaining iron, and thus a technology related to iron removal has been proposed in Korean Utility Model Registration No. 0362736.

그러나 특허문헌 1은 주물사에 잔재된 철분을 자력을 이용하여 제거하게 되는데, 입자가 큰 철분은 제거되지만, 입자가 미세한 철분의 경우 제거되지 못하는 문제점이 있었다.However, Patent Document 1 removes iron remaining in the casting sand using magnetic force, and iron powder with large particles is removed, but there is a problem that iron powder with fine particles cannot be removed.

한국등록실용신안 제0362736호(2004.09.13)Korean Utility Model Registration No. 0362736 (2004.09.13)

본 발명은 상기와 같은 점을 감안하여 안출된 것으로서, 본 발명의 해결과제는, 주물사에 포함된 미세 철분을 화학적 방법으로 제거 가능한 주물사의 철분제거 방법을 제공하는 데 목적이 있다.The present invention has been devised in view of the above points, and an object of the present invention is to provide a method for removing iron content of a foundry sand capable of removing fine iron content contained in the foundry sand by a chemical method.

상기 목적을 달성하기 위한 본 발명에 따른 주물사의 철분제거 방법은, 주물사에 잔재된 철분을 자력에 의해 제거하는 제1 단계; 상기 철분이 1차 제거된 주물사의 미세 철분을 2차로 제거하기 위해 산으로 처리하는 제2 단계; 상기 산 처리된 주물사를 중화 처리하는 제3 단계; 및 상기 중화 처리된 주물사를 세척하는 제4 단계;를 포함할 수 있다.A method for removing iron content from a foundry sand according to the present invention for achieving the above object comprises: a first step of removing iron remaining in the foundry sand by magnetic force; A second step of treating with an acid to secondarily remove the fine iron powder of the foundry from which the iron powder was first removed; A third step of neutralizing the acid-treated foundry sand; And a fourth step of washing the neutralized casting sand.

상기 제2 단계에서 산은 황산 또는 염산일 수 있다.In the second step, the acid may be sulfuric acid or hydrochloric acid.

상기 제3 단계에서 중화제는 수산화나트륨일 수 있다.In the third step, the neutralizing agent may be sodium hydroxide.

상기 제1 단계 수행시 원주면에 방사상의 자석이 배치된 롤러의 상측에서 주물사를 낙하시켜 주물사에 포함된 철분이 상기 롤러의 회전 과정에서 자석에 붙게 되고, 상기 자석에 붙은 철분 입자가 상기 롤러의 외주면과 근접한 일측에 설치된 스크레이퍼(scraper)에 의해 분리될 수 있다.When performing the first step, the casting sand is dropped from the upper side of the roller on which the radial magnet is disposed on the circumferential surface, so that the iron powder contained in the casting sand adheres to the magnet during the rotation of the roller, and the iron particles attached to the magnet are It can be separated by a scraper installed on one side close to the outer circumferential surface.

본 발명에 의하면, 주물사에 포함된 입자가 큰 철분을 물리적인 방법에 의해 1차 제거한 후, 입자가 미세한 철분은 화학적 방법으로 2차 제거하여 인체 사용 가능한 티타늄 등과 같이 고정밀한 금속의 제조시 우수한 결과물을 도출 가능한 효과가 있다.According to the present invention, after first removing iron powder with large particles contained in the casting sand by a physical method, iron powder with fine particles is secondaryly removed by a chemical method, resulting in excellent results in manufacturing high-precision metal such as titanium that can be used for the human body. There is a possible effect to derive.

도 1은 본 발명에 의한 주물사의 철분제거 방법을 도시한 블록도이다.
도 2는 본 발명에 의한 주물사의 철분제거 방법에서 철분 자력 제거 장치를 도시한 개략도이다.
도 3은 본 발명에 의한 주물사의 철분제거 방법에서 철분 자력 제거 장치를 도시한 확대도이다.
도 4는 도 3의 A 부분 확대도이다.1 is a block diagram showing a method of removing iron from a casting sand according to the present invention.
Figure 2 is a schematic diagram showing an iron magnetic force removal device in the iron removal method of the foundry according to the present invention.
Figure 3 is an enlarged view showing the iron magnetic force removal device in the iron removal method of the foundry according to the present invention.
4 is an enlarged view of part A of FIG. 3.

본 발명의 상기와 같은 목적, 특징 및 다른 장점들은 첨부도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명함으로써 더욱 명백해질 것이다. 이하 첨부된 도면을 참조하여 본 발명의 실시예에 따른 주물사의 철분제거 방법에 대해 상세히 설명하기로 한다.The above objects, features and other advantages of the present invention will become more apparent by describing in detail a preferred embodiment of the present invention with reference to the accompanying drawings. Hereinafter, with reference to the accompanying drawings will be described in detail a method for removing iron content of the foundry according to an embodiment of the present invention.

도 1은 본 발명에 의한 주물사의 철분제거 방법을 도시한 블록도이고, 도 2는 본 발명에 의한 주물사의 철분제거 방법에서 철분 자력 제거 장치를 도시한 개략도이고, 도 3은 본 발명에 의한 주물사의 철분제거 방법에서 철분 자력 제거 장치를 도시한 확대도이며, 도 4는 도 3의 A 부분 확대도이다.1 is a block diagram showing a method of removing iron content from a foundry sand according to the present invention, FIG. 2 is a schematic diagram showing an iron magnetic force removal device in the method of removing iron content from a foundry sand according to the present invention, and FIG. 3 is a casting sand according to the present invention It is an enlarged view showing the iron magnetic force removal device in the method of removing iron, and FIG. 4 is an enlarged view of part A of FIG. 3.

도 1 내지 도 4를 참조하면, 본 발명의 주물사의 철분제거 방법은 자력에 의한 철분 1차 제거 단계(S100), 산 반응에 의한 철분 2차 제거 단계(S110), 주물사 중화 처리 단계(S120) 및 주물사 세척 단계(S13)를 포함한다.Referring to Figures 1 to 4, the iron removal method of the foundry sand of the present invention is the first iron removal step (S100) by magnetic force, the secondary iron removal step by acid reaction (S110), the foundry sand neutralization treatment step (S120) And a casting sand washing step (S13).

자력에 의한 철분 1차 제거 단계(S100)는 도 2에 도시된 바와 같이 주물사에 잔재된 철분을 자력에 의해 제거하는 단계로, 철분 자력 제거 장치(200)에 의해 철분을 제거하게 된다.The primary removal of iron by magnetic force (S100) is a step of removing the iron remaining in the casting sand by magnetic force, as shown in FIG. 2, and the iron is removed by the iron magnetic force removal device 200.

여기서, 철분 자력 제거 장치(200)는 도 3 및 도 4에 도시된 바와 같이 회전 과정에서 상부에서 낙하하는 주물사에 잔재된 철분을 자력에 의해 제거하기 위한 장치로, 본체(210), 잠금부(220), 자석(230) 및 스크레이퍼(240)를 포함한다.Here, the iron magnetic force removal device 200 is a device for removing the iron remaining in the casting sand falling from the top in the rotation process by magnetic force, as shown in FIGS. 3 and 4, the main body 210, the locking part ( 220), a magnet 230 and a scraper 240.

본체(210)는 롤러 형상으로 형성되며, 원통 형상의 외주면을 따라 설정 간격마다 홈(212)이 방사상으로 함몰 형성된다.The body 210 is formed in a roller shape, and a groove 212 is formed radially indented at each set interval along an outer peripheral surface of a cylindrical shape.

이때, 홈(212)에는 가압판(214)이 바닥면에서 이격 설치되고, 바닥면과 가압판(214)의 사이에 탄성부재(216)가 구비되어 가압판(214)에 탄성력이 작용하도록 한다.At this time, in the groove 212, the pressing plate 214 is spaced apart from the bottom surface, and an elastic member 216 is provided between the bottom surface and the pressing plate 214 so that an elastic force acts on the pressing plate 214.

여기서, 가압판(214)은 그 위에 자석(230)이 올려지게 되는데 잠금부(220)들에 의해 자석(230)의 단부가 고정될 때, 고정 반대 방향으로 탄성력을 제공하도록 하여 잠금부(220)에 의해 자석(230)의 상면을 가압하고 있는 자석(230)의 저면을 밀게 됨으로써 자석(230)을 견고하게 고정 가능하게 한다.Here, in the pressing plate 214, the magnet 230 is mounted thereon. When the end of the magnet 230 is fixed by the locking portions 220, the locking portion 220 is provided with an elastic force in the opposite direction of the fixing. By pushing the bottom surface of the magnet 230 pressing the upper surface of the magnet 230, the magnet 230 can be firmly fixed.

잠금부(220)는 본체(210)의 홈(212)마다 위치된 자석(230)을 고정시키는 구성으로, 자석(230)의 길이와 대응되는 형상으로 형성되면서 단면이 양측면에 가압 경사면(222)이 형성된 역사다리꼴 형상으로 형성된다. The locking part 220 is configured to fix the magnet 230 located in each groove 212 of the body 210, and is formed in a shape corresponding to the length of the magnet 230, and the cross section is pressed on both sides of the inclined surface 222. It is formed in a reverse trapezoidal shape.

이때, 가압 경사면(222)은 자석(230)의 양측면에 형성된 경사면(232)에 각각 밀착된 상태에서 잠금부(220)를 본체(210)에 볼트 등으로 체결시킬 때, 체결하면 할수록 자석(230)의 양쪽 경사면(232)을 가압하게 되므로 자석(230)이 눌려지면서 견고한 고정이 가능하게 한다.At this time, when the pressing inclined surface 222 is in close contact with the inclined surfaces 232 formed on both sides of the magnet 230, when fastening the locking part 220 to the main body 210 with bolts, the more the magnet 230 ), since both inclined surfaces 232 are pressed, the magnet 230 is pressed and a solid fixation is possible.

자석(230)은 본체(210)의 홈(212)에 각각 삽입되며, 이웃한 잠금부(220)의 가압 경사면(222)과 대응되는 상면 양측에 경사면(232)이 각각 형성된다.The magnets 230 are respectively inserted into the grooves 212 of the main body 210, and inclined surfaces 232 are formed on both sides of the upper surface corresponding to the pressing inclined surfaces 222 of the adjacent locking parts 220, respectively.

스크레이퍼(240)는 본체(210)의 외주면에서 소정 간격 이격된 하측에 설치되어 자석(230)에 붙어 있는 입자가 큰 철분을 자석(230)으로부터 분리시킨다.The scraper 240 is installed at a lower side spaced apart from the outer circumferential surface of the main body 210 by a predetermined distance to separate the iron powder having large particles attached to the magnet 230 from the magnet 230.

한편, 도면에는 도시하지 않았지만, 홈(212)의 대향된 내벽면에 종방향의 홈이 각각 형성되고, 종방향의 홈 내에 볼과 스프링이 순차적으로 각각 삽입 고정되어 자석(230)이 홈(212) 내부에 삽입될 때 양쪽 볼이 자석(230)의 양측면을 가압하게 할 수도 있다.On the other hand, although not shown in the drawing, grooves in the longitudinal direction are respectively formed on the opposite inner wall surface of the groove 212, and the balls and springs are sequentially inserted and fixed in the grooves in the longitudinal direction, so that the magnet 230 is inserted into the groove 212 ) When inserted into the interior, both balls may press both sides of the magnet 230.

더욱이, 자력에 의한 철분 1차 제거 단계(S100) 수행시 자력 뿐만 아니라 주물사를 망에 통과시켜 입자가 큰 철분을 재차 제거할 수도 있다.In addition, when performing the first iron removal step (S100) by magnetic force, the iron powder having large particles may be removed again by passing not only the magnetic force but also the casting sand through the net.

산 반응에 의한 철분 2차 제거 단계(S110)는 철분이 1차 제거된 주물사의 미세 철분을 2차로 제거하기 위해 황산 또는 염산 등을 포함한 산으로 처리하는 단계이다.The secondary removal of iron by acid reaction (S110) is a step of treating with an acid including sulfuric acid or hydrochloric acid in order to secondaryly remove the fine iron of the foundry from which the iron is first removed.

즉, 산 반응에 의한 철분 2차 제거 단계(S110)는 주물사에서 입자가 큰 철분을 제거한 후 주물사에 잔재된 미세 철분을 산과 화학반응을 일으켜 화학반응에 의해 녹게 하는 것이다.That is, the secondary removal of iron by acid reaction (S110) is to remove the iron powder having large particles from the foundry sand, and then cause a chemical reaction of the fine iron powder remaining in the foundry sand with acid to dissolve it through a chemical reaction.

주물사 중화 처리 단계(S120)는 산 처리된 주물사를 수산화나트륨 등의 중화제를 이용하여 중화 처리하는 단계이다.The casting sand neutralization treatment step (S120) is a step of neutralizing the acid-treated casting sand using a neutralizing agent such as sodium hydroxide.

이때, 중화제는 수산화나트륨 뿐만 아니라 돌로마이트, 마그네샤 석회, 고토 석회, 수산화마그네슘, 탄산마그네슘, 마그네시아, 마그네사이트 등 칼슘과 마그네슘이온을 함유한 알칼리성 물질 대체 사용이 가능하다.At this time, the neutralizing agent can be used instead of alkaline substances containing calcium and magnesium ions such as dolomite, magnesia lime, goto lime, magnesium hydroxide, magnesium carbonate, magnesia, and magnesite, as well as sodium hydroxide.

한편, 주물사 중화 처리 단계(S120) 수행시 교반을 통해 중화 정도를 향상시킬 수 있다.On the other hand, it is possible to improve the degree of neutralization through stirring when performing the casting sand neutralization treatment step (S120).

주물사 세척 단계(S13)는 중화 처리된 주물사를 세척수를 이용하여 세척하는 단계이다.The casting sand washing step (S13) is a step of washing the neutralized casting sand using washing water.

이와 같이 본원발명의 주물사의 철분제거 방법은 자력에 의해 입자가 큰 철분을 주물사로부터 1차로 제거하고, 산에 의해 입자가 미세한 철분을 주물사로부터 2차로 제거하며, 철분이 제거된 주물사를 중화 처리한 후 세척하는 공정을 구현하게 되므로 입자가 크고 작은 철분 불순물을 모두 제거 가능하게 된다.As described above, the method of removing iron from the casting sand of the present invention firstly removes the iron powder with large particles from the foundry sand by magnetic force, removes the iron powder with fine particles from the foundry sand secondly by acid, and neutralizes the foundry sand from which the iron powder is removed. Since the post-washing process is implemented, all iron impurities with large and small particles can be removed.

한편, 주물사에 철분이 포함된 경우 금속이 녹을 때 철분이 같이 녹거나 철분과 결합되면서 표면이 매끄럽지 않게 되는 문제점을 해결할 수 있다.On the other hand, when iron is included in the casting sand, it is possible to solve the problem that the surface is not smooth as the iron is melted together or combined with the iron when the metal is melted.

이상 첨부된 도면을 참조하여 본 발명의 실시 예들을 설명하였지만, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자는 본 발명이 그 기술적 사상이나 필수적인 특징을 변경하지 않고서 다른 구체적인 형태로 실시될 수 있다는 것을 이해할 수 있을 것이다. 그러므로 이상에서 기술한 실시예들은 모든 면에서 예시적인 것이며 한정적이 아닌 것으로 이해해야만 한다.Although the embodiments of the present invention have been described with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features. You can understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting.

200: 철분 자력 제거 장치
210: 본체
220: 잠금부
230: 자석200: iron magnetic force removal device
210: main body
220: locking part
230: magnet

Claims (4)

주물사에 잔재된 철분을 자력에 의해 제거하는 제1 단계;
상기 철분이 1차 제거된 주물사의 미세 철분을 2차로 제거하기 위해 산으로 처리하는 제2 단계;
상기 산 처리된 주물사를 중화 처리하는 제3 단계; 및
상기 중화 처리된 주물사를 세척하는 제4 단계;를 포함하는 것을 특징으로 하는 주물사의 철분제거 방법.
A first step of removing iron remaining in the casting sand by magnetic force;
A second step of treating with an acid to secondarily remove the fine iron powder of the foundry from which the iron powder was first removed;
A third step of neutralizing the acid-treated foundry sand; And
A fourth step of washing the neutralized casting sand; iron removal method of the casting sand comprising a.
 제1항에 있어서,
상기 제2 단계에서 산은 황산 또는 염산인 것을 특징으로 하는 주물사의 철분제거 방법.
The method of claim 1,
In the second step, the acid is sulfuric acid or hydrochloric acid.
 제1항에 있어서,
상기 제3 단계에서 중화제는 수산화나트륨인 것을 특징으로 하는 주물사의 철분제거 방법.
The method of claim 1,
In the third step, the neutralizing agent is sodium hydroxide.
 제1항에 있어서,
상기 제1 단계 수행시, 원주면에 방사상의 자석이 배치된 롤러의 상측에서 주물사를 낙하시켜 주물사에 포함된 철분이 상기 롤러의 회전 과정에서 자석에 붙게 되고, 상기 자석에 붙은 철분 입자가 상기 롤러의 외주면과 근접한 일측에 설치된 스크레이퍼(scraper)에 의해 분리되는 것을 특징으로 하는 주물사의 철분제거 방법.The method of claim 1,
When performing the first step, the casting sand is dropped from the upper side of the roller on which the radial magnet is disposed on the circumferential surface, so that the iron powder contained in the casting sand is attached to the magnet during the rotation of the roller, and the iron particles attached to the magnet are applied to the roller. A method for removing iron from castings, characterized in that separated by a scraper installed on one side adjacent to the outer circumferential surface of.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112355236A (en) * 2020-10-26 2021-02-12 丹东市隆盛铸造有限公司 Sand-iron separation device for vibration shakeout machine

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KR930012259A (en) * 1991-12-31 1993-07-20 최근선 EMBO manufacturing device for synthetic resin window frame aggregate
KR100362736B1 (en) 2000-04-03 2002-12-28 한국과학기술원 Energy-storing prosthetic feet
KR20070095252A (en) * 2007-03-29 2007-09-28 정의장 Recycling sand using waste foundry sand
KR20180018569A (en) * 2015-06-11 2018-02-21 신토고교 가부시키가이샤 Method and apparatus for regeneration of main criminal

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Publication number Priority date Publication date Assignee Title
KR930012259A (en) * 1991-12-31 1993-07-20 최근선 EMBO manufacturing device for synthetic resin window frame aggregate
KR100362736B1 (en) 2000-04-03 2002-12-28 한국과학기술원 Energy-storing prosthetic feet
KR20070095252A (en) * 2007-03-29 2007-09-28 정의장 Recycling sand using waste foundry sand
KR20180018569A (en) * 2015-06-11 2018-02-21 신토고교 가부시키가이샤 Method and apparatus for regeneration of main criminal

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112355236A (en) * 2020-10-26 2021-02-12 丹东市隆盛铸造有限公司 Sand-iron separation device for vibration shakeout machine

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