• 한국염색가공학회지
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• 제16권6호
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• pp.16-22
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• 2004

This study was carried out to investigate K/S values, surface color, the fastness to washing, bacteria reduction rate of the silk and cotton fabrics dyed with Rhus verniciflua extract under the various dyeing conditions. The optimum dyeing temperature, dyeing time, dyeing pH and repetition of the silk fabrics dyed with Rhus verniciflua extract were $l00^{\circ}C, 30min., pH 5, five times repetition respectively, but in the cotton fabrics, it were $60^{\circ}C . 30min., pH 7, one times repetition. It were colored orangish Yellow in the silk fabrics and colored bright yellow in the cotton fabrics dyed with Rhus verniciflua extract. Surface color(munsell value) was not changed by the mordanting agents but those of the silk showed high tone when mordanting with stannous chloride, and it was decolored and darked when mordanting with ferric sulfate. The fastness to washing in the silk fabrics dyed with mordanting agents improved in 4～5 grade, but the cotton fabrics were 3～4 grade, so washing fastness of the silk and cotton fabrics were significantly improved when washing with the neutral detergent. The bacteria reduction rate of the silk fabrics increased drastically by dyeing of Rhus verniciflua extract.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.268-276
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• 2008

The status of contaminated soils vary widely ; therefore, the techniques and equipment applicable to the soil concerned should be selected and used after careful consideration. Hyundai Soil Washing is physical-chemical separation based on mining and mineral processing principles for removing a broad range of organic and inorganic contaminants from soil. Mobile plant(capacity 15 tons./hr) was installed for this project. The goals of this project were 1) to verify the applicability of the washing process, which showed reliable results in the pilot plant with various kind of contaminated soils and 2) to promote recycling of the washed soil as a backfill on site. The results revealed that $F^-$ and $Pb^{2+}$ in the soil were effectively washed out to a certain level which washed soil was acceptable for recyeling.

• 한국재료학회지
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• 제26권6호
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• pp.306-310
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• 2016

To produce 4N grade high-purity silica powder from natural ore, the mineralogical characteristics of natural silica ore were investigated and their effects on the purification process were revealed. The Chinese silica mineral ore used was composed of iron and aluminum as main impurities and calcium, magnesium, potassium, sodium, and titanium as trace impurities; these trace impurities generally exist as either single oxides or complex oxides. It was confirmed that liberation and acidic washing of the impurities were highly dependent on the particle size of the ground silica ore and on its mineralogical characteristics such as the distribution and phases of existing impurities. It is suggested that appropriate size reduction of silica ore should be realized for optimized purification according to the origin of the natural silica ore. A single step purification process, the mechano-chemical washing (MCW) process, was proposed and verified in comparison with the conventional multi step washing process.

• 한국의류학회지
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• 제28권3_4호
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• pp.444-451
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• 2004

This study was carried out to investigate the chemical and dyeing properties of Petasites japonicus leaf extract under the various extracting and dyeing conditions such as temperature, time, the ratio of water and pH, repetition of dyeing in silk and cotton fabrics with Petasites japonicus leaf. The results were as follows: 1. It was found that λ$_{\max}$ of color solution extracted by Petasites japonicus leaf has two peaks at 290nm and 323nm. 2. The optimum extracting conditions were studied at 10$0^{\circ}C$, 40min., pH 7 and 1 : 20(the ratio of water and Petasites japonicus leaf), the optimum dyeing temperature, dyeing time, dyeing pH and repetition of dyeing were 10$0^{\circ}C$, 60min., pH 7, repetitions of three times, respectively. 3. Silk and cotton fabrics dyed with Petasites japonicus leaf extract were colored yellowish orange. The colory Petasites japonicus leaf extract in silk and cotton fabrics were deeped by same-mordanting with aluminum potassium sufate and cupric sulfate. 4. Washing fastness of silk fabrics was 4∼5 grade, but cotton fabrics was 3∼4 grade, so washing fastness of silk fabrics washed with neutral detergent was excellent.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 INTERNATIONAL SYMPOSIUM ON SOIL & GROUNDWATER ENVIRONMENT
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• pp.169-170
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• 2005

• Bulletin of the Korean Chemical Society
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• 제29권5호
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• pp.911-912
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• 2008

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2003년도 international symposium on advanced powder metallurgy
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• pp.68-69
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• 2003

• 대한환경공학회지
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• 제27권10호
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• pp.1072-1080
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• 2005

과거 납제련소 부지의 중금속으로 오염된 토양을 EDTA, citrate, HCl의 세가지 용매를 이용하여 토양세척법으로 처리한 경우 중금속의 추출특성에 대하여 중금속의 추출율과 화학적 결합형태별 변화를 중심으로 살펴보았다. EDTA를 이용한 토양세척실험에서 중금속의 추출은 Pb에 특히 효과적이었다. EDTA/HM의 물비가 증가할수록 Pb의 제거율도 증가하였고 EDTA/HM의 몰비 6.5에서 효율적인 제거가 가능하였다. Citrate를 이용한 토양세척실험에서 중금속의 추출은 다른 중금속들 보다 Zn의 추출에 효과적이었다. HCl은 모든 중금속에 대하여 전반적으로 높은 추출율을 나타내었으며 0.3N 농도에서 가장 효율적인 추출이 가능하였다. EDTA로 토양세척법 처리 전후 중금속의 결합형태별 변화는 교환성과 탄산염 형태와 같이 결합력이 약한 형태로 존재하는 중금속이 대부분 추출되었다. Citrate와 HCl 처리 후 중금속의 결합형태별 변화는 네가지 중금속 모두 유사한 경향을 보였으며 Pb은 처리 전보다 처리 후에 교환가능성 형태가 증가하는 현상이 관찰되었다. Citrate 처리시 중금속 추출효율은 비결정성 형태의 함량과 거의 일치하는 결과를 나타내었다. EDTA와 HCl을 이용한 경우는 중금속 추출효율과 중금속의 결합형태의 비교결과 Zn을 제외한 나머지 중금속의 경우 비잔류성 형태의 대부분을 제거할 수 있었다. 처리 후 토양의 TCLP 결과는 EDTA로 처리한 경우에 Pb의 USEPA 기준인 5 mg/L를 만족시켰다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제14권1호
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• pp.61-67
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• 2009

현장규모의 유류오염 토양세척에 따른 세척 유출수를 처리하기 위해 다단계 물리화학적 무방류 수처리시스템을 이용하였다. 오염토양세척 후 세척토양과 세척수 처리효율을 평가하기 위해 단위공정별 잔류하는 TPH(세척토양), COD$_{Mn}$, SS, n-hexane을 분석하였다. 세척 유출수 시료채취지점은 침사지,응집 침전조 그리고 유수분리조의 유출수,공정수,저장조 유입수로 4곳의 시료채취 지점에서 총 3회에 걸쳐서 실시하였다. 또한 약8개월간의 토양세척 및 공정수 저장조의COD$_{Mn}$, SS, 그리고 n-hexane을 분석하였다. 그결과, 오염토양의 농도조건과 상관없이 오염토양의 세척효율이 평균95.9%로 높았고, 수처리 공정 최종 방류구인 공정수 저장수의 COD$_{Mn}$, SS, 그리고 n-hexane가 수질환경보전법상 청정지역 방류수질기준 미민으로 검출되었다. 현장규모의 토양 세척수 처리시스템은 세척수를 100%세척공정수로 재이용하여 환경친화적이고 경제적인 토양세척 처리공법이 될 수 있음을 시사하고 있다.

• 한국염색가공학회지
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• 제4권2호
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• pp.69-75
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• 1992

This study was carried out to compare the effect of caustic soda with the effect of caustic potash on cotton fabric. Instead of caustic potash, sodium carbonate similar in chemical composition to caustic potash was used. The damage of cotton cellulose by repeated washing in various alkaline solutions at 8$0^{\circ}C$, 60 rpm was examined. The damage of cotton cellulose by the variation of copper number, carboxyl content, degree of polymerization and retained tensile strength was estimated. The results obtained at this study are as follows; 1. The damage of cotton by caustic soda was severer than caustic potash. The retained tensile strength at 50 washing cycle in caustic soda was 59% and in sodium carbonate was 80%. 2. By adding soap to caustic soda, the damage of cotton fabric decreased because contact area between fabric and air diminished by foam. 3. Detergency of EMPA 101 in caustic soda was lower than sodium carbonate. Consequently, using caustic soda that damage fabric severely and have lower detergency for caustic potash is unreasonable.