• Title/Summary/Keyword: silicon sludge

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Synthesis of Si-SiC-CuO-C Composite from Silicon Sludge as an Anode of Lithium Battery (실리콘 슬러지로부터 리튬전지(電池) 음극용(陰極用) Si-SiC-CuO-C 복합물의 합성(合成))

  • Jeong, Goo-Jin;Jang, Hee-Dong;Lee, Churl-Kyoung
    • Resources Recycling
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    • v.19 no.4
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    • pp.51-57
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    • 2010
  • As a recycling of Si sludge from Si wafer process, a Si-SiC-CuO-C composite material was synthesized and investigated as an anode material for lithium batteries. The Si sludge consisted of Si, SiC, machine oil, and metallic impurities. The oil and metal impurities was removed by organic washing, magnetic separation, and acid washing. The Si-SiC-CuO-C composite from the recovered Si-SiC mixture was prepared by high-energy mechanical milling. According to the electrochemical tests such as charge-discharge capacity and cycling behavior, it showed the improved cycle performance. The SiC and CuO-related phases were presumed to restrain the volume expansion of the anode and Fe, however, should be removed below 10 ppm prior to synthesis of the composite because it caused the capacity loss of the active material itself.

Reduction Behavior of Self-Reducing Pellets of Chromite and Si Sludge with and without Carbon

  • Jung, Woo-Gwang;Hossain, Sakib Tanvir;Kim, Jong-Ho;Chang, Young-Chul
    • Korean Journal of Materials Research
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    • v.29 no.10
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    • pp.592-602
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    • 2019
  • Feasibility is investigated for reduction of chromium ore by Si sludge with mixed silicothermic and carbothermic reaction. The reduction behavior of chromium ore using Si sludge is investigated precisely to determine the effects of carbon addition, reaction time, and reaction temperature. The pellets are dropped into the furnace after temperature stabilized. As the amount of C addition increases, the amounts of CO and $CO_2$ gas generation increase. After the dropping of the pellets, the pellets are heated and the reaction starts at about 1,573 K or higher. The pellets maintain their shape until 10 min after the drop, and then melted. As the holding time increased, the size of the reduced metal particles increased. The chromium ore is rapidly reduced by the Si sludge, and the slag penetrated into the chromium ore and reduction progressed inside. As the reduction temperature increased, the reaction initiation time is shortened and the reaction fraction of the reduction reaction increased. As the reaction temperature increased, agglomeration of reduced ferrochrome metal is promoted.

Utilization of Paper Sludges for Developing Bed Soils and Seedling Pots (I) - Physico-chemical analysis of paper sludges - (상토 및 육묘 포트의 개발을 위한 제지 슬러지의 이용 (제1보) - 제지 슬러지의 물리.화학적 분석 -)

  • Kim, Chul-Hwan;Kim, Gyeong-Yun;Sin, Tae-Gi;Jung, Ho-Gyeong;Lee, Young-Min;Song, Dae-Bin;Huh, Moo-Ryong
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.39 no.4
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    • pp.61-67
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    • 2007
  • Paper sludges collected from three different paper mills were physico-chemically analyzed in order to use them as raw materials for making bed soils and seedling pots. The sludge from a fine paper mill contained lots of inorganic pigment particles used for coating, as those from a newsprint mill and a tissue mill had not. It was clearly through XRD analysis confirmed that all sludges included calcium carbonate. The paper sludge from the tissue mill contained the greatest amount of particles, which would contribute to water absorption and nutrient storage. The sludge from the fine paper mill had the highest density due to many inorganic elements. While the ash content and the total nitrogen content were the highest in the sludge from the fine paper mill, the C/N ratio was the lowest in the fine paper mill sludge. All sludges seemed to have insufficient contents of potassium. The sludges from the newsprint mill and the tissue mill showed more silicon contents than that from the fine paper mill. It was concluded that the sludge from the fine paper mill would be able to be the most efficient raw materials for making bed soils and seedling pots and the other two sludges would be more efficient for intensive culture for crops such as rice and grain with additional supplement of nitrogen and other nutrients.

Separation and Recovery of Silicon and Silicon Carbide from Slicing Sludge of Silicon Ingot (실리콘 잉고트 절단 슬러지로부터 실리콘 및 실리콘카바이드 분리 회수)

  • Kim, Byoung-Gyu;Jang, Hee-Dong;Chang, Won-Chul
    • Proceedings of the Korean Institute of Resources Recycling Conference
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    • 2004.05a
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    • pp.186-190
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    • 2004
  • 실리콘 잉곳의 절단공정에서 발생하는 폐슬러지는 실리콘과 실리콘카바이드 등의 유가자원이 함유되어 있으며, 이를 효과적으로 분리, 회수하는 방법에 대해 검토하였다. 폐슬러지에 함유된 오일은 유기 용매에 의해 용해되어 효과적으로 분리되었고, 불순물인 철분은 자력선별에 의해 제거할 수가 있었다. 또한 실리콘과 실리콘카바이드의 혼합 분말은 중액선별을 통하여 고순도의 실리콘과 실리콘카바이드로 분리할 수가 있었다.

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Effects of Filtering System of Cutting Fluid on the Surface Quality of Plasma Etching Electrode (절삭유의 필터링 시스템이 플라즈마 에칭 전극의 표면 품질에 미치는 영향)

  • Lee, Eun Young;Kim, Moon Ki
    • Journal of the Semiconductor & Display Technology
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    • v.17 no.4
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    • pp.46-50
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    • 2018
  • The purpose of this study is to analyze effects of filtering system of cutting fluid which is used for machining silicon electrode. For the research, different sizes of filter clothes are applied to check grain size of sludge of cutting fluid. Surface roughness of machined workpiece, depth of damage inside of silicon electrode, and suspended solids of cutting fluid are experimented and analyzed. From these experiments, it is verified that filtering system of cutting fluid is very important factor for machining. Results of this study can affect various benefits to the semiconductor industry for better productivity and better atmospheric pollution in workplace.

Strength properties according to mixing type and ratio Alkali activator of Non-cement matrix using Paper Ash and Polysilicon sludge (폴리실리콘 슬러지와 제지애시를 활용한 무시멘트 경화체의 알칼리자극제 종류 및 혼입율에 따른 강도특성)

  • Sin, Jin-Hyun;Kim, Tae-Hyun;Kim, Heon-Tae;Lee, Dong-Hoon;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.173-174
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    • 2017
  • Recently, many experiments using industrial by-products have been going on in Korea and abroad. Most of the studies on blast furnace slag and fly ash have been conducted, and the blast furnace slag based two and three component experiments have been conducted in many places. Therefore, this study is an additional study of research using polysilicon sludge and paper ash, which is a study using existing industrial by-products based on blast furnace slag, as strength properties of alkali activator according to kind and mixing ratio and to obtain basic data do.

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Suggestion of Physicochemical Characteristics and Safety Management in the Waste Containing Nanomaterials from Engineered Nano-materials Manufacturing Plants and Waste Treatment Facilities (산업용제조시설과 폐기물처리시설에서 발생된 나노폐기물의 물리화학적 특성 및 안전관리방안 제시)

  • Kim, Woo-Il;Yeon, Jin-Mo;Cho, Na-Hyeon;Kim, Yong-Jun;Um, Nam-Il;Kim, Ki-Heon;Lee, Young-Kee
    • Journal of Korea Society of Waste Management
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    • v.35 no.7
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    • pp.670-682
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    • 2018
  • Engineered nanomaterials (ENMs) can be released to humans and the environment through the generation of waste containing engineered nanomaterials (WCNMs) and the use and disposal of nano-products. Nanoparticles can also be introduced intentionally or unintentionally into waste streams. This study examined WCNMs in domestic industries, and target nanomaterials, such as silicon dioxide, titanium oxide, zinc oxide, nano silver, and carbon nanotubes (CNTs), were selected. We tested 48 samples, such as dust, sludge, ash, and by-products from manufacturing facilities and waste treatment facilities. We analyzed leaching and content concentrations for heavy metals and hazardous constituents of the waste. Chemical compositions were also measured by XRD and XRF, and the unique properties of nano-waste were identified by using a particle size distribution analyzer and TEM. The dust and sludge generated from manufacturing facilities and the use of nanomaterials showed higher concentrations of metals such as lead, arsenic, chromium, barium, and zinc. Oiled cloths from facilities using nano silver revealed high concentrations of copper, and the leaching concentrations of copper and lead in fly ash were higher than those in bottom ash. In XRF measurements at the facilities, we detected compounds such as silicon dioxide, sulfur trioxide, calcium oxide, titanium dioxide, and zinc oxide. We found several chemicals such as calcium oxide and silicon dioxide in the bottom ash of waste incinerators.

Study on Synthesis of Silicon alkoxides from Slicing Sludge of Silicon Ingot (실리콘 잉고트 절단 슬러지로부터 실리콘 알콕사이드 합성에 관한 연구)

  • Kim, Byoung-Gyu;Jang, Hee-Dong;Chang, Won-Chul
    • Proceedings of the Korean Institute of Resources Recycling Conference
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    • 2004.05a
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    • pp.98-102
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    • 2004
  • 반도체 산업용 실리콘 잉곳의 절단공정에서 발생하는 폐슬러지 중에는 고순도의 실리콘이 함유되어 있으며, 이 슬러지로부터 분리, 회수한 Si로부터 실리콘화합물 합성하였다. 고비점의 potasium alkoxide 촉매 존재하에서 금속 실리콘과 에탄을 혹은 메탄올과 같은 알코올과의 고액반응에 의해 알콕시 실란을 합성할 수가 있었다 알콕시 실란을 합성반응속도는 반응온도에 크게 의존하였고 최적반응 온도는 $180^{\circ}C{\sim}195^{\circ}C$ 정도이었다. 촉매 첨가량에 따라 알콕시 실란의 반응율이 달라졌으며, 알콕시 실란의 반응율은 최고 90%로 높은 값을 나타내었다.

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Properties of Portland Cement Clinker Using Polysilicon Sludge (폴리실리콘 슬러지를 원료로 사용한 포틀랜드 시멘트 클링커의 특성)

  • Lee, Seung-Heun;Lee, Se-Jin;Woo, Yang-Yee;Park, Jeoung-Soo
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.2 no.4
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    • pp.328-334
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    • 2014
  • This study reviewed the usability of sludge, a material that is additionally created when polysilicon (a solar light material) is produced, as the raw material for cement clinker. It was evaluated that when cement clinker is produced, the chloric component of polysilicon acted as a mineralizer in the firing process. In addition, the physical features of the produced cement were measured. The setting time of the produced cement was reduced as the amount of content of polysilicon sludge increased. Such results were drawn because the chloric component acted as hydration accelerator and enhanced the dissolution of calcium hydroxide that was formed by hydration of $C_3S$. Furthermore, for such reason, on the day 1, the compression strength of mortar increased as the content of polysilicon sludge increased. In day 3, 7, and 28, the tendency in which the compression strength increasing up to 5% of the amount of added polysilicon sludge was shown. It is because when clinker was produced, the chloric component increased the amount of $C_3S$ mineral created, thus enhancing the compression strength after day 3.