• Journal of Korean Electronics
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• v.3 no.9
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• pp.58-63
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• 1983

• Journal of Korean Electronics
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• v.3 no.3-4
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• pp.69-72
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• 1983

• Resources Recycling
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• v.16 no.6
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• pp.34-38
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• 2007

For recycling of tantalum from obsolete condenser, physical separations and chlorination of tantalum scraps with $Cl_2$ and $CCl_4$ were investigated. The recovery ratio of tantalum from obsolete condenser was 98% by using a multidisciplinary process of crushing by stamp mill, wet gravity separation by the shaking table, and air classification. In the chlorination reaction of non-oxidized Ta anode with $Cl_2$, the highest weight loss ratio is at least 60%, while in the chlorination reaction of Ta anode with $CCl_4$, the reaction rate for the oxidized Ta anode is faster than that of the non-oxidized Ta anode.

• Proceedings of the KWS Conference
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• 1998.10a
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• pp.262-265
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• 1998

• Journal of Korean Electronics
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• v.3 no.3-4
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• pp.73-75
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• 1983

• Resources Recycling
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• v.12 no.3
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• pp.3-12
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• 2003

Physical separation containing grinding, sieving, dry magnetic separation and air classification were carried out in order to recover Ta anode from waste Ta condenser. Roll crusher wat used for the liberation of resin and metals in closed circuit system. The liberation between Ta anode and resin was easily achieved, whereat some of metals did not liberated from the Ta anode when the waste condenser was crushed below 8 mesh. When the crushed sample were divided into 8/10 mesh, 10/18 mesh and -18 mesh, metals was mainly remained in 8/10 mesh in contrast to Ta anode was in +18 mesh. It was shown that resin was more easily crushed rather than metals from the result of that resin content was 71.5％ in -18 mesh. The liberation efficiency was different with the input size of the crushed sample and average efficiency was 62.3% due to the locked Ta anode particles. The results of air classification test for the crushed samples showed that optimal air flow are 39㎥/h, 32㎥/h, 20㎥/h. respectively. When the sample were separated with optimal condition, 94.45％ Ta anode containing 97.47 wt.％ Ta anode, 0.93 wt.％ resin. 1.61 wt.％ metal was recovered with 49.39 wt.％ yield.

• Proceedings of the Materials Research Society of Korea Conference
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• 2003.03a
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• pp.152-152
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• 2003

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2004.04a
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• pp.32-33
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• 2004

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2003.04a
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• pp.7-7
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• 2003

90년대 중반부터 이동통신제품과 인터넷의 대중화에 의한 노트북 PC등 휴대용 멀티미디어제품의 수요 급증은 전자 제품의 소형화 및 복합화를 유도하였으며, 이러한 제품의 추세에 대응하기 위하여 세라믹 부품은 벌크 단품에서 적층형으로 급속하게 바뀌고 있다. 이러한 정보기기의 좀 더 낳은 생산성과 효율을 얻기 위해 소형화, 경량화 및 고기능화의 요구에 대응되는 공정으로서 부품의 표면실장기술이 80년대에 실용화되었고, 이에 따른 칩 부품의 수요도 급격히 증가하고 있다. 대표적인 칩부품중의 하나인 MLCC(Multi Layer Ceramic Capacotor)는 전자제품의 소형경량화 및 대량생산과 더불어 필수적이 수소동자로써 지금까지 그 성장세는 휴대폰과 컴퓨터생산의 빠른 증가에 EK라 매년 약 15% 정도로 증가하고 있으며, 앞으로 그 수요는 더욱더 등가 할 것이다. EH한 고용량 영역까지 용량대를 확장함으로써, 탄탈 및 알루미늄 전해콘덴서의 영역까지도 확대 형성될 것으로 예상되고 있다. 본 강연에서는 MLCC의 제조기술 동향과 시장에 대한 전망에 대해 소개함으로써, 하루가 다르게 발전하고 있는 전자산업의 고용량화, 초소형화, 특수품, 복합화 등의 적층부품 전반의 현황 및 발전방향 파악하는데 조금이라도 도움이 되고자 한다.

• Korean Journal of Metals and Materials
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• v.47 no.6
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• pp.338-343
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• 2009

The purpose of this study is to make the tantalum powder for solid electrolyte capacitor with SHS (self-propagating high-temperature synthesis) process. Raw materials for manufacturing Ta powder were used $Ta_{2}O_{5}$, Mg and NaCl. While progressing SHS process, $Ta_{2}O_{5}$ powder was reduced by Mg powder. The combustion temperature and velocity were easily controled by the varying mole ratio of NaCl, Mg and initial reaction pressure. In the case of only using NaCl as an inorganic agent, the shape is unagglomerated and has high surface area. whereas we were given the powder which has good net structure by the addition of excessive Mg as a diluent.