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RISS 인기검색어
- 검색키워드
- 주제어 : used foundry sand (검색결과 3 건)
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김영준,정명희 유기성자원학회 2010 유기물자원화 Vol.18 No.4
Foundry sands are made up of silica and some coking agents, such as bentonite or resin, and used as templates for the production of various casting products. Foundry sands, which are repeatedly used, were finally transformed into the waste materials by heat, losing their proper functions. The used foundry sands have been treated as general wastes according to the contents of coking agents used. Silica, however, can be recycled through the proper treatment due to its physical property not to changed by heat. In this study, we have identified and investigated at the occurrence, treatment and recycling status of the used foundry sands, as well as for the regime and inhibitory factors of the recycling of them in domestic and foreign cases. 주물사는 규사에 벤토나이트나 resin 등의 점결제를 첨가한 것으로써 주물제품의 생산을 위한 주형에사용되고 있다. 주물업체에서 반복적으로 사용된 주물사는 결국 열에 의해 파쇄되어 그 기능을 상실하며 폐주물사로 전락된다. 폐주물사는 점결제의 성분 및 함량에 따라 지정 또는 일반폐기물로 처분되고있지만 주물사의 주종을 이루는 규사는 열에 의해 변성되지 않는 성질로 인하여 적절한 처리를 통하여재사용이 가능하다. 본 연구에서는 국내⋅외 폐주물사의 발생 및 처리, 재활용현황, 그리고 재활용에 관련된 제도 및 재활용을 저해하는 요인 등을 조사하여 문제점을 도출하고 폐주물사의 재활용 활성화방안을 제시하였다.
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Mechanical properties of regenerated foundry sand with pre-treatment process
김경호,강부윤,이만식 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Sand casting in cast industry is the most widely used process to produce molds and cores using cementitious binder. In this process, organic foundry binder system is the main production process owing to good adhesive strength and water resistance. However, large volume of combustion gas involving the evaporative chemical species at higher temperature is produced which leads to surface flaw. Moreover, both energy consumption and expense spent in the process of physical or thermal recycling of used-foundry sand raise manufacturing costs. Thus, inorganic binders that are satisfying with similar performance of organic binder spread out over the recently years. In this study, it was demonstrated the chemical recycling of used-foundry sand produced in inorganic binder system. And the impact on the strength with the amount of binder removal was studied.
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Khuram Rashid,Tabasam Rashid 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.6
This work is conducted with the aim of using waste material to reserve the natural resources. The objective is accomplished by conducting experimentation and verify by modeling based on fuzzy logic. In experimentation, concrete is casted by using natural/river sand as fine aggregate and termed as control specimen. Natural sand is conserved by replacing it with used foundry sand (UFS) by an amount of 10, 20 and 30% by weight. Fresh and hardened properties of concrete are investigated at different ages. It is observed that compressive strength and modulus of elasticity reduced with the increase in amount of UFS. Furthermore, concrete compressive strength is predicted by using fuzzy logic model and verified at different replacement ratio and age with experimental observations.
ScienceON
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