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A Study on the Impact Load Quantification of the Jaw Crusher (쇄석기의 충격하중 정량화에 대한 연구)

  • Hong, Sung Ju;Yang, Hae Jeong
    • Journal of Drive and Control
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    • v.16 no.2
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    • pp.1-7
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    • 2019
  • Jaw crusher is a device that breaks rock collected from mines or quarries to produce aggregates of the size desired by user. A representative method for measuring load is to measure them by attaching force sensors directly to the part where the load is generated. However, the direct method has many limitations such as high-impact loads generation in equipment or space constraints, sensor capacities and costs. Therefore, Transfer Path Analysis (TPA) was used to indirectly measure impact loads by attaching acceleration sensors. In this study, both direct and TPA methods were used to measure the impact load of Jaw crusher. This study finally quantifies the impact of the load generated by the Jaw crusher using direct method and TPA method, and comparing the impact load measured calculated the derive the error rate.

Effect of Crushing Gap of Jaw Crusher on the Quality of Fine Aggregates Made with High-Strength Waste Concrete (조크러셔 파쇄간격이 고강도 폐콘크리트로 제조된 순환 잔골재의 품질에 미치는 영향)

  • Lim, Gun-Su;Lee, Jun-Seok;Lee, Dong-Yun;Kim, Jong;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.06a
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    • pp.60-61
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    • 2020
  • In this study, the recycled fine aggregates produced from the waste concrete by using Jaw crusher depending on crushing gap of Jaw crusher were studied to offer a solution for recycled fine aggregate for concrete. The results of the experiment showed that the factors that influence grading and water absorption ratio, density and grain shape were significantly characterized by the generation of the particulate matter and the crushing shape of the aggregate.

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Effect of Crushing Gap of the Jaw Crusher on the Properties of Fine Aggregates made with Waste Concrete (조크러셔 파쇄 간격 변화가 폐콘크리트로 제조된 잔골재의 특성에 미치는 영향)

  • Lim, Gun-Su;Lee, Jun-Seok;Lee, Dong-Yun;Kim, Jong;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.06a
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    • pp.124-125
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    • 2020
  • In this study, the characteristics of fine aggregates produced according to the jaw crush crushing gap variation were studied and analyzed in terms of recycled aggregates, and the experiments were conducted in terms of grading, density, water absorption, unit volume weight, grain shape. It was shown that the quality of the fine aggregate was affected by the shape of the morphological crushing.

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Gravity Separation Characteristic for the Gold.Silver Ores on the Philippine Mankayan District (필리핀 만카얀 지역 금.은 광석의 비중선별 특성)

  • Kim, Hyung-Seok;Chae, Soo-Chun;Kim, Jeong-Yun;Sohn, Jeong-Soo;Kim, Sang-Bae
    • Journal of the Mineralogical Society of Korea
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    • v.21 no.4
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    • pp.383-395
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    • 2008
  • To enhance the grade and recovery rate of the gold/silver ores which yield at Philippine Mankayan mine, we studied the characteristics which are the geologic and mineralogical features of gold and silver ore, the liberation by crushing and grinding, the separation by sieving and shaking table. Gold/silver ore is composed of the sulfide minerals like pyrite, sphalerite, galena; and the gangue minerals which is quartz, clay. Gold/silver element are mainly contained in a sulfide minerals like pyrite, sphalerite and galena. To increase the liberation rate of sulfide minerals containing gold/silver element, the gold/silver ore has to be grounded under $100{\mu}m$ very finely because the crystal size of sulfide minerals is distributed from $1{\mu}m$ to $100{\mu}m$. The liberation rate of gold/silver ore increases to 92% when the particle size ($d_{90}$) of ore is grounded below $100{\mu}m$ by jaw crusher $\to$ cone crusher $\to$ rod mill by steps. The grade and recovery of sulfide minerals could not be enhanced by sieving separation because those crystal size is distributed homogeneously below $100{\mu}m$. But, when we separated the sieved ore using shaking table, the gold and silver grade increased to 40 ppm and 140 ppm, respectively. Then the recovery rate of gold reach almost 100% but that of silver is no more that 50%.

A Study on the Use of Mine-Waste on the Chung-Buk Area as the Aggregate of Concrete(I) -Part I : The Aggregate Properties of Mine Waste- (충북지역 광산발석의 콘크리트용 골재화에 관한 연구 (I) -제1보 : 광산발석의 콘크리트용 골재로써의 특성-)

  • 류현기;윤기원;한천구;김무한
    • Proceedings of the Korea Concrete Institute Conference
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    • 1994.04a
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    • pp.197-202
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    • 1994
  • This study is designed for analyzing the physical properties of grading, shape, specific gravity and etcetera of mine-waste as the aggregate of concrete when mine waste is crushed by jaw crusher, and is aimed presenting the using the possibility, content and reference data for the quality control of practical use on the concrete using the mine-waste aggregate.

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A Study on the Utilization of Yun Chun Andalusite as a Raw Material of High Alumina Refractories (II) -On the Concentration and Purification- (고 알루미나질 내화물 원료로서 연천산 홍주석의 이용에 관한 연구(II) -홍주석의 선광 및 정제-)

  • Ahn, Young-Pil;Choi, Long
    • Journal of the Korean Ceramic Society
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    • v.11 no.1
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    • pp.23-28
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    • 1974
  • 1. Stage crushing by jaw crusher, steel mortar, and ball mill in turn has shown an inclination to increase the distribution of andalusite in coarse particles as well as to increase that of micas in fine particles. 2. Water elutriation was effective for the removal of muscovite and magnetic separation was effective for that of Mg-Fe micas such as biotte and chlorite. The process of concentration and that of purification are diagramatized respectively as follows: Concentration; Raw andalusite${\lightarrow}$Crushing${\lightarrow}$Screening${\lightarrow}$Water elutriation${\lightarrow}$Magnetic separation Purification; Concentrated andalusite${\lightarrow}$Calcination${\lightarrow}$Ball milling${\lightarrow}$Screening${\lightarrow}$Water elutriation${\lightarrow}$Magnetic separation${\lightarrow}$Acid washing.

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Mechanical Behavior of Coal Mine Waste Concretes (석탄폐석을 이용한 콘크리트의 역학적 거동)

  • Lee, Bong-Hak
    • Journal of Industrial Technology
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    • v.16
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    • pp.105-112
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    • 1996
  • This paper presents coal mine waste (CMW) for use in concrete manufacture as a replacement of normal aggregates. The CMW in this study was collected from Sabook, Jungson-kun, Kangwon-do. Fine and coarse asggregates from CMW were prepared by crushing it in a jaw crusher and separating debris with #4 sieve. CMW aggregates showed good physical and mechanical properties with having specific gravity over 2.65, absorption less than 1%, and abration ratio below 20%, but particle shape of CMW was long or flat, which caused a poor workability in mixing. Therefore, to make workability better, a 1/4 of CMW coarse aggregate was replaced with normal aggregate which had a good particle shape, and a superplasticizer was added to the mix. Compressive strength and other mechanical properties of CMW concrete was very good. In conclusion, characteristics of CMW concrete was acceptable for use as a concrete structural material.

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Application of Aggregate Recycled in-situ for Anti-frost Layer and Lean Concrete Base Course (저노현장파쇄 순환골재의 동상방지층 및 빈배합콘크리트기층 정용성평가)

  • Kim Jin-cheol;Shim Jae-won;Cho Kyou-sung
    • Resources Recycling
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    • v.14 no.4 s.66
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    • pp.10-16
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    • 2005
  • In order to recycle the waste concrete from which the reproductive aggregate should be produced in-situ, the applicability of crushers and recycled aggregates, and the compliance with the specification have been evaluated comprehensively. As a result of them, the properties of recycled aggregate particles were inferior to the natural one because of the adherent mortars on the recycled one, and the mobile impact crusher and the eccentric-mounted cone and jaw were superior to the others for the graded aggregates. In the case of anti-frost layer, the recycled one was easily controlled since the dry densities, contrary to natural one, were not largely changed with the moisture contents. It was found that the lean concrete base course is not influenced by absorption as cement dust grows larger, and the 7-day compressive strengths of lean concrete were higher than 10 MPa regardless of the crushing type.

Study on the Recovery of Metallic Aluminum in Black Dross generated from the Used Beverage Cans (UBC) Recycling Process with Crushing Mechanism (파쇄 기구에 따른 알루미늄 캔 재자원화 공정 중 발생한 블랙 드로스 내 알루미늄 회수에 관한 연구)

  • Han, Chulwoong;Son, Seong Ho;Ahn, Byung-Doo;Kim, Dae-Guen;Lee, Man Seung;Kim, Yong Hwan
    • Resources Recycling
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    • v.26 no.4
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    • pp.71-78
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    • 2017
  • This study investigated the recovery of metallic aluminium in the black dross generated from used beverage can recycling process with crushing mechanism such as compression and impact. The as-received Al black dross had a spherical shape, and its size was about 10~40 mm. Also, The X-ray diffraction pattern showed that the main contents of black dross are composed of halite (NaCl), sylvite (KCl), spinel ($MgAl_2O_4$) and corundum ($Al_2O_3$). A metallic aluminium recovery test was performed using jaw crusher and hammer mill having different crushing mechanism. It was analysed that Jaw crushing process can separate into metallic aluminium and non metallic constituents. However, hammer milling process shows significant difference on the separation results. It was found that jaw crushing process was effective for recovery of metallic aluminium in the black dross than that of hammer milling process.

A Study on the Influence of the Number of Re-crushing with regard to the physical Properties of Recycled Coarse Aggregates (재생조골재의 물리적 특성에 미치는 재파쇄회수의 영향에 관한 연구)

  • Choe, Min-Su;Kim, Mu-Han;Namba, Atsushi;Abe, Michihiko
    • Proceedings of the Korea Concrete Institute Conference
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    • 1995.04a
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    • pp.160-163
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    • 1995
  • 본 硏究는 現在 일상적 있는 재생조골재를 죠오크러져(modified-jaw crusher)를 이 용하여 다시 1-3 파쇄를 행함으로써 재생골재의 품질이 어느정도 개량될 수 있는가를 실험 적으로 구명하여 재생골재의 실용화를 위한 하나의 방법을 제한하고자 하는 것이다. 실험결 과,재화파생 처리를 행하지 않은 경우의 재생근 골재의 흡수율은 5-7%정도이나 재파쇄를 함에 따라 흡수율은 현저하게 낮아져, 3차례의 재파쇄를 행한 경우 흡수율이 2% 이래로 나 타나 재생근골재의 품질을 학보하기 위하여는 재파쇄가 매우 유용한 방법임을 알 수 있었 다. 또한 흡수율의 본포도 처음에는 2개의 범주를 가지고 넓게 산포하게 되나 재파쇄가 진 행될수록 재생근골재중에 부착되어 있던 모르터분이 점차 떨어져 나감에 따라 품질의 산포 가 상당히 낮아지는 결과를 얻었다. 그러나 이와같은 재파쇄에는 많은 실용적 부담이 발생 하게 되므로 골재의 품질과 경제적효율을 고려하여 정적한 재파쇄회수가 결정되어야 할 것 으로 사료 된다.

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