폐분체 도료의 재활용 방안에 관한 연구

신동철,김영훈,이순기,김경원,신선명,강헌찬 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.1

With the progress of industry, the much more demand of paint around us grows rapidly. However, the whole quantity of raw materials used to make powder coatings is presently imported to fill the domestic needs. Moreover, it is well known that the waste powder coatings from the domestic industries are mostly incinerated. The method of destructing the waste powder coatings by fire causes VOC to be generated, and this results in some serious environmental problems such as air pollution and so on. Therefore, the effective and proper measure must be devised to reuse the waste powder coatings for the purpose of eliminating waste of resources and avoiding the outflow of foreign currency. This study aims to make the plan to recycle the waste powder coatings, and its conclusion is drawn as follows: First, it can be seen that the waste powder coatings with a weak electrostatic power restore gradually to the original state of electrostatic power through the process of fusion and retreatment. Second, it can be estimated that those coatings, with the use of the cyclon, can be removed by dividing a powder of particles less than 10㎛. Third, it can be ascertained that the possibility of reusing the waste powder coatings is proved when it is divided into particles by cyclon and a revolving screen after the process of fusion, rolling, crushing and pulverization.

구리, 니켈과 코발트를 함유한 황산용액으로부터 LIX84에 의한 구리의 용매추출

박경호,남철우,신선명 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.3

The solvent extraction of copper by LIX84 in kerosene was investigated to separate and recover copper from solution containing copper, nickel and cobalt leached from matte, intermediate product of manganese nodules. Copper, nickel and cobalt concentrations in synthetic solution were 12 g/ℓ, 15 g/ℓ and 2 g/ℓ respectively, and pH was 4.0, which is similar to those of real leaching solution. The effects of time, pH, extractant concentration and temperature on extraction ratio were investigated and scrubbing and stripping conditions are also tested. The extraction efficiencies of copper, nickel and cobalt were respectively 78.2%, 2.5% and 0.0% with 30% LIX84, O/A 1.0 and equilibrium pH of 1.09, and were increased to 98.9%, 12.3% and 9.5% with controlling equilibrium pH to 2.1. The McCabe Thiele diagram predicts that at an O/A ratio of 1, pH 1.15 with 30% LIX84, three stages are needed to extract the copper concentration from 12.0 g/ℓ in the feed solution to 0.2 g/ℓ in the raffinate, with a copper extraction of over 98%. On the other hand, two stages are required to strip over 95% copper from the solvent (12.0 g/ℓCu) at O/A ratio of 2 with 180 g/ℓH₂SO₄. Nickel (0/46 g/ℓ) in the solvent could be scrubbed at A/O ratio of 1 with 2.0 g/ℓ H₂SO₄.

함구리 황산폐액으로부터 LIX84-Kerosene-Span80-H₂SO₄계 유화형 액막법에 의한 구리의 분리 농축

안종관,안재우,신선명,김동진 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.4

The separation and extraction of copper from waste water solutions by the liquid surfactant membrane process using LM84 as an extractant and Span 80 as a surfactant were investigated . In extraction, the extraction rate of copper was greatly accelerated by the presence of sodium acetate and with the increase of pH in the aqueous feed solution. The optimum concentrations of LIX84 and Span 80 in the membrane phase were 7-10 vol. % and 2.5-3vol. %, respectively. Experiments also showed that the concentration ratio of copper was greatly enhanced with the decrease of the ratio of V_(e) and V_(w) and with the decreasing of A/O ratio. After the extraction process, the concentration of copper in the raffinate solution reduced to 1-2 ppm, and the concentration of copper in the internal aqueous solution increased to 20 gll. (Received February 11, 2004)

황산용액으로부터 LIX973N에 의한 구리의 용매추출

박경호,정선희,신선명,김동수 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.5

Solvent extraction of copper with LIX973N in kerosene was carried out to separate copper from the sulfate leaching solution of matte which is the intermediate product of manganese nodules. It was found that LIX973N had high loading capacity for Cu and separation factors with nickel, cobalt and iron compared to those of LIX84I. Extraction percentage of copper greatly increased with increasing extractant concentration while a little increase in the extraction of the other metals was observed. The two stage counter-current batch simulation study showed that extractions of copper, nickel, cobalt and iron were 96.1%, 2.2%, 0.5% and 0.0% respectively. (Received January 8, 2005)

니켈과 코발트를 함유한 황산용액으로부터 Cyanex 272에 의한 코발트의 용매추출

박경호,정선희,남철우,신선명,김동수 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.11

The solvent extraction to separate and recover cobalt and nickel from sulfuric acid solution was studied using Cyanex 272 in kerosene. The solution processed was equivalent to that expected from leaching of a matte, intermediate product of manganese nodules. The extraction of both metals increased with increasing equilibrium pH and extractant concentration. However, cobalt was preferentially extracted over nickel. The extraction efficiencies of cobalt and nickel were 80% and 1.9% respectively with 0.2M Cyanex and O/A of 1 at equilibrium pH 5.0. The separation factor of Co/Ni increased with raising the extraction temperature (205 at 20℃, and at 441 at 50℃). The saponification of Cynanex 272 increased the extraction of cobalt due to the increase of equilibrium pH. Nickel (0.40 g/l) loaded in an organic phase could be scrubbed with a solution containing 10 g/l Co at equilibrium pH of 6.0. The stage numbers and cobalt recoveries in extraction and stripping processes required for the counter current operations are predicted using the equilibrium isotherm plots. (Received May 19, 2004)

충청도 지역 일대 저품위 질석의 팽창 특성에 관해서

강헌찬,김영훈,김광수,신선명 동아대학교 건설기술연구소 1996 硏究報告 Vol.20 No.1

The propose of this thesis was to study the usage of the low-grade Vermiculite from the Chung Chong province and also to increase its Value-added. A series of experiments have been done for separation as well as heat-expansion characteristics of the Chung Chong Vermiculite some conclusions can be drawn as follows; 1. Vermiculite from Chung-Yang and Hong-Shung areas wear better than that from Palabora's mine in South Africa in terms of the usefulness for an organic fertilizer. 2. The ratio of the volume expansion of Vermiculite increased along with the temperature. 3. In general, the ratio of volume expansion of the vermiculite from Chung-Yang, Hong-Shung and Palabora's mine in South Africa increased with temperature. But it decreased temporarily in the vicinity of 850℃. The result seems to be due to temporary decrease in the latent heat as the crystal water in the crystals such as Ca_(10)(Mg,Fe)₂A1₄Si_(9)O₃₄(OH)₄, K(Fe,Mg)₃AlSi₃O_(10)(OH)₂and K (Fe,Mg)₃AlSi₃O_(10)(OH)₂evaporated. 4. Above 1050℃, the crystal structure began to change and resulted in partial destruction to produce some dusts. Finally sintering occurred.

Comparison of Acid and Alkaline Leaching for Recovery of Valuable Metals from Spent Zinc-carbon Battery

Shin, Shun-Myung,Kang, Jin-Gu,Yang, Dong-Hyo,Kim, Tae-Hyun,Sohn, Jeong-Soo 한국암반공학회 2007 Geosystem engineering Vol.10 No.2

The spent zinc-carbon batteries are composed of approximately 20% of Mn, 20% of Zn, magnetic materials and small amounts of carbon, plastics and electrolyte. Some of zinc metals in the spent battery reacted into zinc oxides and some of $MnO_2$ reduced into $Mn_2O_3$ after discharging reaction. In this study, acid and alkaline processes of spent zinc-carbon battery are proposed and there performances are compared. In case of $H_2SO_4$, the results of zinc and manganese dissolution rates obtained by adding $H_2O_2$ were 93.3% and 82.2%, respectively at 100g/L solid/liquid ratio, 2.0M $H_2SO_4$, $60^{\circ}C$ and 200 rpm. In case of NaOH, the results of zinc and manganese dissolution rates obtained at 100g/L solid/liquid ratio, 4M NaOH, $80^{\circ}C$ and 200 r.p.m. were 82% and below 0.1% respectively. Therefore, the efficiency of selective extraction of Zn was very high.

The Behavior of Valuable Metals from Spent Zinc-Carbon Batteries in Sulfuric Acid Solution

( Shun Myung Shin ),( Jeong Soo Sohn ) 한국폐기물자원순환학회(구 한국폐기물학회) 2005 WASTE RECYCLING AND MANAGEMENT RESEARCH Vol.10 No.1

Study of Cyclic Oxidation for Copper Removal from Solid Ferrous Scrap in End-of-Life Vehicle (ELV)

Shin, Shun Myung,Lee, Dong Won,Ha, Sang An,Wang, Jei Pil Trans Tech Publications, Ltd. 2013 Advanced materials research Vol.699 No.-

<P>Iron and steel scrap have been reused to produce new steel and cast iron in the steelmaking and foundry industry for more than 150 years, but the accumulation of tramp elements contained in steel scrap such as copper, tin, antimony, and arsenic is a major concern. This is primarily because these tramp elements are difficult to remove in conventional steelmaking processes. In particular, the presence of copper during the recycling of steel scrap can cause severe surface cracking during hot rolling (hot shortness), inhibit recrystallization during hot forming, and reduce ductility in deep drawing. For these reasons, considerable efforts have been made in recent decades to develop a technology that can remove copper from ferrous scraps[1-3].</P>

Development of Metal Recovery Process from Alkaline Manganese Batteries in Sulfuric Acid Solutions

Shin, Shun-Myung,Kang, Jin-Gu,Yang, Dong-Hyo,Sohn, Jeong-Soo The Japan Institute of Metals 2007 MATERIALS TRANSACTIONS Vol.48 No.2

<P>A process for the recovery of Mn from a waste of spent alkaline batteries using sulfuric acid and hydrogen peroxide has been investigated. The proposed procedure consisted of mechanical separation of metal-containing particles and a leaching process. The effects of leaching agent, reaction temperature, time and pulp density for the leaching were also examined. Crushing and sieving of the spent batteries resulted in satisfactory separation of particle size from the waste. 99% Zn and 97% Mn were successfully extracted from the spent battery powder by the leaching at 60°C for 60 min with the addition of hydrogen peroxide as a reducing agent. The hydrogen peroxide addition led to almost doubling Mn extraction compared to without it.</P>