• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.86-88
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• 2014

니켈도금폐액은 재자원화되지 못하고 대부분 외부로 위탁 폐수처리되고 있으며, 고가의 금속인 니켈을 회수되지 못하고 버려지고 있는 실정이다. 이에 니켈도금폐액으로부터 니켈을 회수하고, 회수된 니켈을 이용하여 니켈화합물을 제조하여 니켈도금폐액을 재자원하는 기술을 개발하였다.

• Resources Recycling
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• v.13 no.3
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• pp.27-36
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• 2004

Nickel oxide was recovered through roasting of a spent catalyst for hydrogenation reaction. Nickel on Kieselguhr catalysts were prepared by a precipitation method after a treatment of the recovered-nickel oxide with an acid. Effects of roasting temperature of the spent catalyst on recovery of nickel oxide was investigated. Most of nickel oxide could be recovered through roasting of the spent catalyst at $1000^{\circ}C$. In regeneration of catalysts by the precipitation method after the treatment of nickel oxide with an acid, the effect of promoter, precipitation condition and reduction condition on catalytic performance in vegetable oil hydrogenation were investigated. The addition of CaO or $Ce_2$$O_3$ resulted in an increase of catalytic activity.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.312-313
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• 2015

무전해 도금은 석출응력이 낮고 작업하기가 용이하기 때문에 산업분야에 있어서 중요한 역할을 한다. 무전해 도금 공정에 있어서, 니켈금속은 차아인산염, 아미노보레인 혹은 수소화붕소 화합물($HBF_4$)에 의한 니켈이온의 화학적 환원에 의해 도금된다. 환원반응이 진행함에 따라서 도금액 중에서 니켈과 차아인산염 이온은 감소한다. 이에 이러한 이온을 보충하기 위하여 도금액 중에 황산니켈과 차아인산나트륨이 일반적으로 첨가된다. 하지만 축적된 인산염, 황산염, 나트륨과 이외의 물질이 전착 박막의 품질을 떨어뜨리고 도금액은 폐기되기도 한다. 니켈회수 속도는 종래의 50% 이하였던 것이 90%이상으로 향상되었다. 이온교환법은 니켈도금 폐액으로부터 니켈회수에 필요한 친환경적이고 원가절감의 기술이라고 사료된다. 특히, 갈탄이 저렴하고 양이온 교환성능이 뛰어나다. 이유는 -COOH, -OH 등의 기능성 그룹을 갖기 때문이다. Fe-P 화합물은 식물에 유용하지 못하고 마그네슘과 칼슘 기반의 석출물은 저렴하고 취급이 용이하며 비료와 같이 재활용이 가능하기 때문에 일반적인 인의 제거 수단이 될 수 있다. 본고에서는 니켈도금 폐액으로부터 인을 제거하는 데 $Ca(OH)_2$, $CaCl_2$와 $CaCO_3$를 채택하여 인이 제거되는 정도를 비교하였고 니켈회수율을 높이기 위하여 갈탄을 사용하였다.

• Resources Recycling
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• v.9 no.3
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• pp.3-12
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• 2000

A Study on the cementation for the recovery of Cu, Ni and Co with Mn metallic powders in leaching solution from the manganese nodule that have removed Fe ions was studied. The results showed that the recovery efficiencies of metal ions with Mn powders increased when the temperature, pH and the concentration of chloride ions were increased in mixed solution. And the recovery efficiencies of Cu was 98% and not changed with the addition amounts of Mn powders but, in case of Co and Ni, the recovery efficiencies were increased with the addition amounts. The particle size of precipitate was about $5\mu\textrm{m}$. From the results of experiment we proposed the two-step cementation process for the recovery of Cu, Ni and Co with Mn powders.

• Resources Recycling
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• v.9 no.2
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• pp.11-17
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• 2000

Consumption of nickel is continuously increasing and the wastes of secondary battery, ferrite and catalyst containing Ni are also generated periodically. Among those wastes, the aim of this research is the recovery of nickel from used Ni-Cd recharge battery. Battery consisted of Ni 24 wt%, Fe 30 wt% and Cd 18.5 wt%. Metal was recovered by solvent extraction after leaching. Cadmium was leached completely in 1N-HCl and Ni was recovered above 70%. 30 vol% MSP-8 separated Cd and Ni completely from acidic leaching solution. In addition $NH_4NO_3$ as one of ammonium salt type leachants showed an excellent leaching selectivity to Ni and Cd. Ni in leached solution was recovered completely by LIX-extractant and more than 70% of Cd in raffinate was by D2EHPA.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.216-218
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• 2014

자동차용 고광택 크롬 도금 박리액에는 질산과 유가금속인 구리 및 니켈이 다량 함유되어 있는 것으로 알려져 있다. 질산($HNO_3$) 및 유가금속은 고가이며 유독하므로 경제적 및 친환경적으로 반드시 회수하여 재활용하여야 한다. 본 연구에서는 도금박리액으로부터 질산과 구리, 니켈을 용매 추출법을 이용하여 분리하였다. 수상에 존재하는 질산의 농도는 0.01 ~ 1N NaOH를 이용하여 적정하여 분석하고, 금속의 농도는 ICP-MS 및 ICP-AES 등을 이용하여 분석하였다. 도금 박리액을 분석한 결과 Cu(76850mg/L), Ni(51990 mg/L)이 함유되어 있음을 알 수 있었다. 용액 내 질산의 양을 NaOH 용액을 이용하여 적정법으로 측정하였을 때, 질산의 양은 대략 1.02 M 임을 알 수 있었다. 50 % Tributylphosphate (TBP)를 이용하여 3단 추출한 유기층의 용액을 증류수를 이용하여 3회의 역추출을 하였을 때, 원액으로부터 48.1 %의 질산을 회수할 수 있음을 알 수 있었으며, 순도는 99.5% 이상이었다. 질산 회수 후 용액 내에 남은 구리와 니켈은 ISE-106로 구리를 추출하여 니켈을 분리한 후 황산을 이용해 역추출 하였다. 회수된 구리는 NaOH를 이용하여 pH를 조절하고 수산화구리 형태로 침전시킨 후 $N_2H_4$를 이용하여 환원시켰고, 온도와 pH 및 환원제를 이용하여 다양한 조건 하에 구리 분말을 제조하였다. 구리를 추출하여 라피네이트 용액으로 분리된 니켈은 $NaBH_4$를 이용하여 환원시켰고, 다양한 조건 하에서 니켈 분말을 제조하였다. 환원 된 분말은 분석결과 99%의 순수한 분말임을 알 수 있었다.

• Resources Recycling
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• v.20 no.4
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• pp.46-51
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• 2011

A study on the recovery of tin from the steel ball scraps for barrel plating has been carried out the physical treatment and leaching experiment. The recovery of iron component was over 95% by the physical treatment, and the recovery of tin component was also over 95% by the hydro process.

• Resources Recycling
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• v.30 no.6
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• pp.36-42
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• 2021

Spent lithium-ion batteries are treated by reduction-smelting at high temperatures to recover valuable metals. Solvent extraction and precipitation of the HCl leaching solution of reduction-smelted metallic alloys resulted in a filtrate containing Ni(II) and a small amount of Si(IV). Adsorption and precipitation experiments were conducted to recover pure Ni(II) compounds from the filtrate. Si(IV) was selectively loaded onto polyacrylamide, but this method did not efficiently filter the solution due to an increase in viscosity. The addition of Na₂CO₃ as a precipitant to the filtrate led to the simultaneous precipitation of Ni(II) and Si(IV). However, it was possible to recover nickel oxalate with a purity higher than 99.99% by selectively precipitating Ni(II) with the addition of Na₂C₂O₄ as a precipitant.

• Resources Recycling
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• v.33 no.4
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• pp.36-46
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• 2024

We investigated a hydrometallurgical process of nickel recovery from Inconel 713C scrap. The process proceeded with a series of i) comminution of pyrometallurgical treated scrap, ii) sulfuric acid leaching, iii) solvent extraction of unreacted acid, molybdenum, aluminum, and precipitation of chromium, iv) crystallization of nickel sulfate by vacuum evaporation, and v) nickel electrowinning. The nickel-aluminum intermetallic compound, Ni₂Al₃, was formed by the pyrometallurgical pretreatment readily grounded under 75 ㎛. Sulfuric acid leaching was done for 2 hours in 2 mol/L, 20 g/L solid/liquid ratio, and 80 ℃. It revealed that over 98 % of nickel and aluminum was dissolved, whereas 28 % of molybdenum was. A nickel sulfate solution with 2.34 g/L for the crystallization of nickel sulfate hydrate was prepared via solvent extraction and precipitation. Over 99 % of molybdenum and aluminum and 93 % of chromium was removed. Nickel metal with 99.9 % purity was obtained by electrowinning with the nickel sulfate monohydrate in the cell equipped with anion exchange membranes for catholyte pH control. The membrane did not work well, resulting in a low current efficiency of 73.3 %.

• Resources Recycling
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• v.21 no.2
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• pp.41-46
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• 2012

An investigation on the recovery of nickel from spent electroless plating solutions has been performed using the electrowinning method. For this aim, nickel in spent electroless plating solutions was separated as nickel hydroxide through the addition of caustic soda. Nickel hydroxide was completely dissolved with sulfuric acid and an electrolysis was performed for electrowinning of nickel from nickel solutions. As a result, it was found that more than 99% of nickel in spent electroless plating solutions could be precipitated as nickel hydroxide above pH 10 with the addition of caustic soda. As far as the current efficiency in electrowinning of nickel was concerned, it was decreased with increase in the current density.