• 한국결정성장학회지
• /
• 제6권4호
• /
• pp.584-594
• /
• 1996

본 연구에서는 고령토 침출용액으로부터 고순도의 염화알루미늄 결정을 분리하고자 침출용액의 용존 염화알루미늄의 농도, 결정화 온도 및 염소가스 주입속도 등의 결정화 조건이 염화알루미늄 결정의 순도에 미치는 영향에 대해 연구하였다. 결정의 순도는 침출용액의 염화 알루미늄의 과포화 농도 수준에 크게 영향을 받았다. 결정화의 조건에 따라 염화알루미늄의 과포화 농도가 낮게 형성되면 철이온의 함유가 낮은 고순도의 염화알루미늄 결정이 생성되었다. 침출용액 내의 과포화 농도 수준은 용액 내의 용존 염화알루미늄의 농도, 염산 농도, 결정화 온도 등에 의해 결정되었다. 그러나 이와 같은 결정화 조건의 변화에도 불구하고 염화알루미늄의 결정 모양은 침상형으로 일정하게 나타났다. 고령토 침출용액의 염산농도 측정을 위하여 Shank [9]가 제시한 Oxalate 적정법을 적용하였으며 고령토 침출용액과 같은 다성분 이온 용액에서도 정확한 염산 농도 측정이 이루어질 수 있음을 알 수 있었다.

• Journal of the Korean Wood Science and Technology
• /
• 제12권2호
• /
• pp.10-19
• /
• 1984

The $3{\times}3{\times}30$ ($cm^3$) sized lumbers of Populus alba-grandulosa L. were treated with four fire-retardant solutions of ammonium sulfate, monoammonium phosphate, diammonium phosphate and aluminium chloride for 1, 15, 30, and 60 minutes and 1, 3, and 7 days. Thereafter they were air-dried and burned at high temperature about $1,800^{\circ}C$ and for short time of five minutes. This study estimated the relationship between absorbed chemical amounts and rate of weight loss or residual bending strength of these burned lumbers. The results were as follows: 1) In absorption amount of fire-retardant chemicals, diammonium phosphate showed the largest, aluminium chloride the smallest, but monoammonium phosphate and ammonium sulfate showed similar level. 2) The absorption amount of chemicals was decreased with the increase of specific gravity in the same species except aluminium chloride. 3) The rate of weight loss was decreased as the absorption amount of chemicals increased, especially monoammonium phosphate was most effective. 4) The MOR value of the residual bending strength was increased as the absorption amount of chemicals increased and especially monoammonium phosphate showed the most efficient effect. 5) Aluminium chloride showed more striking increase of MOR value of residual bending strength with the increase of absorption amount than any other chemical, therefore its MOR value was similar to the maximum MOR value of the most effective monoammonium phosphate. 6) The correlation between weight loss and MOR value of the residual bending strength was negative and aluminium chloride showed the most striking negative relation, but the others showed similar trends. 7) The correlation between work to proportional limit and absorption amount of chemicals was positive and the degree of increase in work to proportional limit was most in aluminium chloride, and the next, in monoammonium phosphate and diammonium phosphate in turn. 8) The correlation between work to maximum load and absorption amount of chemicals showed positive and diammonium phosphate revealed the best result and aluminium chloride showed better results than other two chemicals.

• International Journal of Advanced Culture Technology
• /
• 제3권1호
• /
• pp.39-45
• /
• 2015

This research aims to study an effect of sodium chloride solution concentration on the corrosion rate of AA1100 aluminium alloy and SGACD zinc coated steel lap joint with a test duration of 30 days and a test temperature of $45^{\circ}$. The summarized results are as follows. Increase of the NaCl solution concentration increased the weight loss of Al, corrosion rate of Al, weight loss of Fe and also decreased the corrosion rate of Fe. Increase of the test duration affected to increase the weight loss and corrosion rate of Al and also decrease the weight loss and corrosion rate of Fe. The corrosion that was formed in a lap joint consisted of the uniform corrosion on the surface of the metals and the galvanic corrosion in the lap area of the joint. The maximum weight loss of AA 1100 aluminium and SGACD zinc coated steel that was occurred in the sodium chloride with 3.25% was 2.203% and 3.208%, respectively.. The maximum corrosion rate of AA 1100 aluminium and SGACD zinc coated steel that was occurred in 4.00% and 3.5% sodium chloride solution was 0.156 mm/year and 0.479 mm/year, respectively.

• 자원리싸이클링
• /
• 제17권2호
• /
• pp.70-75
• /
• 2008

폐전자스크랩, 함주석 폐액 등에서 주석 성분을 회수하기 위한 기초 연구로 주석이 함유된 염산용액에서 알루미늄 분말을 이용한 치환반응에 대한 연구를 실시하였다. 주석이온의 치환 반응에 미칠 수 있는 용액의 pH, 알루미늄 분말 첨가량, 반응온도, 반응시간, 염소이온($Cl^-$) 농도, 불순물 농도 둥에 대해 고찰하였다. 치환실험 결과 알루미늄 분말의 첨가량. 반응온도, pH 및 염소이온 농도가 증가함에 따라 주석이거 치환속도가 증가함을 알 수 있었다. 이들 결과로부터 알루미늄 금속분말을 이용한 금속 주석의 치환 및 회수에 관한 최적 조건을 제시하였다.

• 한국추진공학회:학술대회논문집
• /
• 한국추진공학회 2006년도 제26회 춘계학술대회논문집
• /
• pp.193-196
• /
• 2006

포화된 다중고리를 갖는 화합물의 endo-isomer 로부터 exe-isomer로의 이성화 반응에 대해 연구하였다. 강한 산점을 가지고 있다고 알려져 있는 제올라이트를 촉매로 사용하여 디시클로펜탄 계열의 endo-포화다중고리 화합물을 exe- 형태로 이성화 시켰다 제올라이트의 반응성은 제올라이트 세공의 크기와 제올라이트의 산점의 영향을 받음이 관찰되었다. 실리카와 알루미나의 비율이 낮아짐에 따라 반응성이 증가하였다. 염화알루미늄 촉매 반응의 경우가 제올라이트의 경우 보다 더 낮은 온도와 더 짧은 시간이 걸린다는 장점이 있었다. 그러나 환경적인 면과 취급의 용이성을 감안 할 때 제올라이트를 촉매로 사용할 수 있을 것이라 판단된다.

• 자원리싸이클링
• /
• 제15권5호
• /
• pp.52-56
• /
• 2006

국내 알루미늄 재생업체에서 알루미늄 용해시 발생되는 알루미늄 폐드로스를 사용하여 수처리응집제로 사용되는 폴리염화알루미늄(PAC: Poly Aluminium Chloride)를 제조하였다. 알루미늄 폐드로스를 염산과 반응시켜 폐드로스 중에 잔류하는 금속알루미늄을 PAC용액으로 제조함으로써 수산화알루미늄과 염산을 원료로 사용하여 PAC를 제조하는 종래의 방법에 비해 제품의 원료비를 줄일 수 있고, 알루미늄 폐드로스를 재활용함으로써 매립 등으로 폐기시켜야 할 폐드로스의 양을 줄이는 효과가 있다.

• 상하수도학회지
• /
• 제12권3호
• /
• pp.30-40
• /
• 1998

Increasing water consumption produced sludge problems of the water treatment plants. The objective of this study is to investigate aluminium coagulants recovery n acidic and alkaline conditions. Water treatment plant sludge produced in Pusan Metropolitan City were tested for the aluminium extraction process. Experiment samples were obtained in summer from water treatment plants of Deoksan and Myongjang. Aluminium coagulants used in these plants during the test period were polyaluminium chloride(PAC), polyaluminium sulfate organic(PSO), polyaluminium sulfate silicate(PASS). Aluminium contents of water treatment sludge were in the range of 7.2~10.9% of the total solids. The recovery percentages for aluminium and iron by acidic extraction method was evaluated to 88% and 42% respectively. Extracted mass variation for other materials such as iron, manganese, total organic carbon was observed during the extraction operation. Alkaline extraction produced more than two times amount of total organic carbon than that in the acidic extraction process.

• 대한화학회지
• /
• 제34권4호
• /
• pp.370-376
• /
• 1990

질화 알루미늄을 AlO(OH)로부터 가장 낮은 온도에서 얻은 γ- alumina와 무수 염화 알루미늄 그리고 금속 알루미늄 분말을 출발물질로 하여 합성하는 연구를 하였다. 특히 반응온도에 주목하고 질화 알루미늄을 합성하였고 그 반응 조건들을 결정하였으며 그 결과에 대하여 논의하였다. 금속 알루미늄과 질소 가스의 반응은 비교적 낮은 온도에서 진행 되었고, 이 반응에 대한 반응 파라미터를 속도론적으로 연구하였다.

• 한국표면공학회지
• /
• 제20권3호
• /
• pp.118-126
• /
• 1987

The Zn-Al composite electroplating was studied by using chloride zinc bath containing metal hydroxides $(Zn(OH)_2,\;Al(OH)_3))$ and aluminium powder. The size of Al powder codeposited in the beaker bath with Al powder of-400 mesh was under 10${\mu}m$. The Zn-Al composite was electro-deposited at 40$^{\circ}C$ in the ranges of current density of 5-50 A/$dm^2$ in the flowing electrolyte. The content of aluminium particles codeposited increased slightly with increasing flow rate of electrolyte from 0.5 m/sec to 1.0 m/sec, and decreased with increasing current density from 5 A/$dm^2$ to 50 A/$dm^2$. The content of aluminium particles codeposited by using the electrolyte containing zinc hydroxide(0.1M) was 2~4 wt%. The Al powder was codeposited mainly near the surface layer of the electrodeposits. The dissolution rate of aluminium particles in the electrolyte containing 0.1M $Zn(OH)_2$ and Boric acid was 0.41 g/l. day in comparison with 1.5 g/l. day dissolution rate in pure chloride bath.

• Membrane and Water Treatment
• /
• 제12권2호
• /
• pp.83-93
• /
• 2021

In this study, defluoridation efficiency by aluminium sulphate (alum) and polyaluminium chloride (PACl) were compared for recommended Nalgonda dose (100%) and 80% of this dose in both batch and continuous modes. The residual turbidity was found to be higher in case of alum as compared to PACl with 80% dose representing lesser efficient settling of suspensions, which primarily comprise alumino-fluoro complexes that result in high residual aluminium in the treated water and this was confirmed by TEM and Zeta analysis. Moreover, the application of PACl also resulted in much lesser addition to the TDS and also required lesser lime for pH compensation due to its lower acidity. Hence this reduced dose was recommended for defluoridation. It was also observed that in case of alum, residual aluminium in treated water was 0.88 mg/L (100% dose) & 0.72 mg/L (80% dose) and in case of PACl, it was 0.52 mg/L(100% dose) & 0.41 mg/L(80% dose). After subsequent microfiltration, residual aluminium was 0.28 & 0.21 mg/L for 100% & 80% dose respectively and in case of alum and in case of PACl, it was 0.16 & 0.11 for 100% & 80% dose respectively, which conform to the Al standards(<0.2 mg/L).