피크링 폐황산으로부터 안료의 제조

황용길,성주경,김재호 대한금속재료학회(대한금속학회) 1974 대한금속·재료학회지 Vol.12 No.2

피크링 폐황산중 용존된 철분을 회수하여 산화철 안료를 만들기 위한 연구이다. 우선 피크링 폐황산 (Fe 44/l, SO^(2-)₄177g/l)을 가성소다 용액으로 중화하여 수산화 제1철을 얻었다. 이것을 100℃, 3∼5 atm(送入空氣壓) 하에서 2시간동안 digestion 하였더니 다음과 같이 되었다. 1) Fe(OH)₂와 피크링 폐황산 (혼합용액의 pH7.9)이 반응시는 α-goethite가 생성되고 철의 회수율은 74% 이상이었다. 2) Fe(OH)₂와 황산제2철용액 (spent solution)이 반응시는 magnetite가 되고 90% 이상의 철이 회수되었다. 3) Fe(OH)₂(pH12 solution)만을 반응시킬시는 δ-goethite가 생성되고 90% 이상의 철이 회수되었다. 상기와 같이 생성된 α-goethite와 magnetite를 600℃에서 하소(calcination) 하였더니 모두 양호한 산화제2철 안료로 되었다. 그리고 δ-goethite를 600℃에서 하소하였더니 α-산화제2철과 magnetite의 혼합물이 생성되었다. The formation of iron oxide in a synthetic picklic sulphuric acid studied at elevated temperature and pressures. Waste picklic sulphuric acid was neutralized by adding sodium hydroxide, resulting hydrous ferrous oxide. The hydrous ferrous oxide thus formed was digested under a pressure of 3 to 5 atmospher at 100℃ for two hours. The results obtained were as follows; 1) When Fe(OH)₂ and picklic acid of pH 7.9 were reacted, 74% of iron was recovered in the form of α-goethite. 2) When Fe(OH)₂ and ferric sulphate solution (spent solution) were reacted, the yield in magnetite was better than 90%. 3) When Fe(OH)₂ of pH 12 reacted alone, δ-goethite was formed and yield was higher than 90%. When magnetite and α-goethite obtained were calcined at 600℃ it had been shown that they both could be turned into α-ferric oxide of the pigment grade, a mixture of α-ferric oxide and magnetite was also formed, when σ-goethite was calcinated at 600℃.

폐타이어를 이용한 제강분진 처리를 위한 기초연구

황용길,이상화,이성룡,정석수,최재신,조충형 한국자원리싸이클링학회 1995 資源 리싸이클링 Vol.4 No.4

분진 중에 함유된 Zn, Pb, Fe 등의 유가 금속을 회수하기 위해 폐타이어를 건류하여 만든 건류탄소를 환원제로 이용하여 재활용하고자 하였으며 또한 분진을 Pelletizing 하거나 Briquetting해서 환원 처리할 때, 공해 발생과 작업상의 단점을 보완하기 위하여 제지공장에서 발생하는 폐펄프와 분진 및 건류탄소를 소정의 비율로 혼합한 후 성형한 다음 통기도 및 압축강도실험 등을 한 결과 다음과 같은 결론을 얻었다. 동일한 건류탄소 첨가량에서 결합제로 사용한 폐펄프의 첨가량이 증가할수록 통기도는 증가하며 이는 시편내 Porosiaty에 기인한 영향이라 생각되며, 동일 첨가량의 폐펄프에서 건류탄소의 첨가량이 증가할수록 통기도는 증가하는 경향을 보이며 압축강도는 건류탄소의 비율과 소결온도에 따라 증가 감소의 현상이 다소 상반되는 결과가 나타났다. 건류탄소 20%, 폐펄프 10%를 첨가하여 만든 Briguetting 시료를 X-선 회절분석 결과 $800^{\circ}C$에서는 ZnO와 $Fe_3$$O_4$가 조사되었으나 $1000^{\circ}C$ 이상에서는 ZnO와 $Fe_3$$O_4$를 확인할 수 없었다. $1000^{\circ}C$에서 소결실험을 한 결과 아연, 철산화물이 분해 증발하여 아연품위가 62%인 조산화아연물을 얻을 수 있었다. Distillation oI the dust generated during waste tue pyrolysis was perIomerl to rccover valuable metal sucll as zlnc. lead and iron. Pemcahilily and carnprcssivc tests were pursucd to ahlain the basic dala for cslraclian of zinc from the slntering propcrtp ol stccl making dusts and distilled carhon of waste tires as wcll as wastc pulp sludge mixlure hr~quet were investigated at various sinlcring lempcraturcs. Permeablllly rncieased with increastng amount of waste pulp in specil~cd istilled carhon due tn the fnrmat~ono f porusily in lhe sample TIE co~npress~vsctr ength showed the vanous values wlth different amDunl of dislilled-carhon adrlit~nilsa nd at diIIerenl sinlering tcmpcralures. X-ray diffifraction anvlyscs oI a hnquet rn~rhtre of steelmaking dusts(20Q didilled carhon and 10% waste pulp sblered ;>I SOOT) showcd thal the briquet consisted ot ZnO and Fc,O.,, hut was not found at the hriguet rintered at over 10OO'C. Crude zinc oxide sintered a1 IOOOC contained OZA Zn.

銅. 니켈 黃酸鹽廢棄物의 處理

黃龍吉,李相和 동아대학교 환경문제연구소 1980 硏究報告 Vol.4 No.1

廢棄되는 黃酸鹽 試料를 處理한 結果 1. 이 試料는 主로 NiSO₄와 FeSO₄의 黃酸鹽이었으며 이들은 750℃에서는 α-Fe₂O₃만 X-線으로 確認되고 1,000℃에서는 NiO와 Fe₃O₄가確認되었다. 2. 黃酸鹽 溶液中의 鐵을 除去하기 위해서 酸化시켜 加水分解한 結果 pH 3~4.5에서 鐵이 赤褐色의 水酸化鐵로 加水分解가 되었고 이때 水酸化鐵中에 含有되어 있는 Ni은 1.2%에 달했다. 3. Eluent LIX-64N을 溶液의 부피와 대등한 부피를 취해서 Ni과 Cu를 抽出했을 경우의 pH는 7以上에서 抽出이 잘 되었고 pH 8.5~10까지의 條件에서 Resine을 處理했을 경우에 Raffinate中에 Ni 含量은 1.2gr/ℓ 程度 存在했으며 Extraction rate는 約 98%에 달했다. The following results have been obtained by treating samples of used sulfate. (1) The X-ray diffraction analysis has shown that this sulfate sample consisting mainly of NiSO₄ and FeSO₄ gives α-Fe₂O₃ at 750℃ and produces NiO and Fe₃O₄ at 1,000℃. (2) When the sample is oxidized and then hydrolysed to remove iron in a solution of sulfate, it has been found that iron turns into reddish-brown hydroraded iron. When this occurs, the Ni content of hydrated iron has reached 1.2%. (3) It has been shown after taking eluent LIX-64N the volume of which is equivalent to the volume of solution that the extraction for Ni and Cu can be done effectively at pH values of 7 or more and that under that condition of pH range from 8.5 to 10 the Ni content of raffinate is about 1.2gr/ℓ, when resine is treated, and extraction rate has been obtained to be nearly 98%.

酸化크롬의 還元機構 (Ⅰ)

黃龍吉,康熙南 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.1

The reduction of chromium oxide by carbon in the range of 1150°~ 1300℃ under the Ar atmosphere has been investigated. The results obtained from the experiment is summarized as follow; 1) From the results of thermal analysis by T.G-D.T.A., metallic chromium and chromium carbide were formed in the range of endothermic reaction. And in this range, the rate of weight loss was reached 29.9% 2) As the reaction temperature increased, the reaction products become coarser, and in the view of area frequency distribution, the particle size from 31㎛ to 40㎛ became coarser about 4 times at the 1300℃ than the 1150℃ 3) From the X-ray diffraction analysis, reaction products at the 1200℃ were mainly Cr₃C₂ and Cr_(7)C₃, and at the 1300℃ the rection products were Cr and Cr_(7)C₃. 4) The reduction rate calculated with the reaction rate of metallic chromium was 98.7%

폐Al dust와 폐주물사를 이용한 재료 개발

黃龍吉,金蓮洙,金宰逸 동아대학교 환경문제연구소 1986 硏究報告 Vol.19 No.2

The results of sulphuric acid leaching Aluminium dust and of making hydraulic-setting cement stone using Aluminium dust are as follows. 1. Sulphuric acid leaching efficient of Al is better when concentration of sulphuric acid is 200gr/ℓ, over 60℃, for lhours. 2. The aqueous solution recovered from sulphuric acid leaching of Aluminium dust contains Al^(+3) 13.5gr/ℓ and Fe^(2+) 1.65g/ℓ. 3. The hydraulic-setting cement stone making from mixture of cement, foundry sand, fly ash and Aluminium dust pulp(Na₂O·Al₂O₃) has more compressive strength comparing to other cement stones which make from mixture of cement, foundry sand and Aluminium dust pulp and mixture of cement and sand only. 4. Aluminium dust pulp has rapid hydraulic-setting effect in making cement stone.

電氣爐 製鋼粉塵을 발즈法으로 還元 할때에 爐塊 生成에 관하여

黃龍吉,李相和,金榮熙,李成龍 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2

The steelmaking dust treatment process has been established through reducing volatilization method in rotary kiln. The more content of zinc in reduced pellets and basicity of pellet is in the range of 1.5~3.0, the more working time needed in rotary kiln, because of decreasing wall accretion. A portion of well forming kiln coating in the furnace is a fourth of the total length from the outlet. Constitutes on the furnace wall accretion composed of the mixtures such as Fe, FeO, Fe₂O₃, Fe₃O₄, ZnO and CaO-SiO₂system, and formation of kiln coating is decreased by adding coke ratio.

질소-프로판-공기 분위기에서 유동상 침탄 특성

黃龍吉,李相和,金榮熙 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1

The effect of air : propane ratios on the microstructure of carburized layers, internal oxidation characteristics and carburizing atmospheres during fluidized-bed carburizing under the nitrogen-6% propane base atmosphere were investigated At air : propane ratios less then 3 : 1 carbon potential of fluidized bed carburizing at mosphere was shown to be settled down to good carburizing condition, while carbon potential was shown to be decreased abruptly and CO₂ content increased exceedingly at air : propane ratios greater than 3 : 1. Under the same carburizing condition, the effective case depth of the carburized specimens decreased with Nicontent. At the given ratio of air to propane, the depths of internal oxidation layer appered to be increased almost linearly as carburizing time and the total contents of Si, Mn and Cr of steel increased. For air : propane ratios less than 3 : 1 at 930℃ it was concluded that the most effective carburizing condition and the control of internal oxidation could be obtained easily.

精密機械 및 機能性材料用 鐵粉末의 還元機構

黃龍吉 東亞大學校 大學院 1989 大學院論文集 Vol.14 No.-

Ferrous chlorides (FeCl₂) have been neutralized by Ammonium hydroxide(NH₄, OH), then Iron hydroxides(Fe(OH)₂) are obtained by air oxidation. After filtration, washing and drying, chemical and physical properties have been investigated. This Iron hydroxides have been charged into the tube type reduction furnace and reduced in 3 ℓ/min hydrogen gas flow. As the result, it was summarized as below. 1) Sample is yellowish acicular β·FeOOH which are less smaller then 1μ. 2) When β·FeOOH were calcinated, there are 10% weight loss about 200-300℃ range, they are decomposed to 0.2-0.5μ γ-Fe₂O₃. at 600℃. 3) After hydrogen reducing below 330℃, Fe( )O( ) have been produced. When this magnetite was oxidized about 250-300℃, Coercivity force(Hc) have been 250 Oe and particle size of α-Fe₂O₃ are 0.3-0.5μ. 4) As the result hydrogen reducing at 550℃, 0.3-0.5μ spheroidal Iron particles have been produced.

石炭石과 無煙炭에 의한 밀·스케일의 還元

黃龍吉,李成龍,朴載奉 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.1

Some coked anthracite and Mill Scale pellet was packed in a tube furnace. And then, the heating samples was reacted with CO₂ gas made from wasting acid. The results of the experiment of reduction and gasification were as follows. 1) When waste acid was neutralized by some lime stone, vields of CO₂ gas was attained 80%. 2) The amount of CO gas producted at 1100℃ was 1.37times the amount of CO₂ gas made from wasting acid, and 1.5 times the amount at 1300℃. 3) During 5 houre for experiment the rate of reduction was 78% at 100℃ and 97.2% at 1300℃. 4) When Mill Scale pellet was reducted into CO gas, the value of activation energy was 3154.2 ㎈/g-㏖. The following can be resulted from what mentioned above: The neutralization of waste acid by lime stone can be a preventive of water pollution. And we can product not only fuel gas by the gasification of the anthracite reacting with CO₂ gas, but also sponge iron by the reduction of Mill Scale. The above four results can serve as a base source for the production of those materials.

Ni 염용액에서의 (鹽溶液) Ni 이온의 환원거동 (還元擧動)

황용길,김병철 대한금속재료학회 1987 대한금속재료학회 학술대회 개요집 Vol.1987 No.0