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Recovery of ferromagnetic material by wet magnetic separation in coal bottom ash
Han, Gi-Chun,Um, Nam-Il,You, Kwang-Suk,Cho, Hee-Chan,Ahn, Ji-Whan 한국암반공학회 2009 Geosystem engineering Vol.12 No.1
A coal ash generated from a coal-fired power plant largely divided into fly ash and bottom ash. All of the coal fly ash has been recycled and the coal bottom ash (CBA) in only a part restricted within narrow field. But, many researchers have investigated the study about recycling of CBA by physical separation because it has various materials such as silicate, aluminate, unburned carbon and magnetic-substance. For example, it is easy to be removed by magnetic separation in the case of magnetic-substance contained in CBA. Thus, we investigated the recovery of ferromagnetic material by wet magnetic separation in CBA. For this study, we researched the recovery rate of ferromagnetic material, such as iron and magnetite through wet magnetic separator at various magnetic forces and confirmed the distribution of ferromagnetic material as a various particle size.
Effect of Magnetic Separation in Heavy Metals of Municipal Solid Waste Incineration Bottom Ash
Han, Gi Chun,Um, Nam Il,You, Kwang Suk,Cho, Hee Chan,Ahn, Ji Whan Trans Tech Publications, Ltd. 2007 Materials science forum Vol.544 No.-
<P>Bottom ash contains many ferrous materials (e.g. ferrous metals, Fe3O4, Fe2O3, FeS). In addition, ferrous metals include the heavy metals, as Ni and Cr have a chemical attraction to iron, with Cu used to coat with Ni and Cr metals for polishing or to prevent corrosion. For ferrous metals, the formation of a Fe3O4-Fe2O3 double layer (similar to pure Fe) was found during air-annealing in an incinerator (1000C). A strong thermal shock, such as that which takes place during water-cooling of bottom ash, leads to the breakdown of this oxidation layer, facilitating the degradation of ferrous metals and the formation of corrosion products. Therefore, Fe-ion (heavy metal) oxides can be formed on ferrous metals, and magnetic separation can separate it from bottom ash. Thus, in this study the objection is to investigate the separation ratio of heavy metals by magnetic separation along with the mineralogical formation of Fe-ion (a heavy metal).</P>
Change of mineral phases in carbonation reaction of MSWI bottom ash
Han, Gi-Chun,Um, Nam-Il,You, Kwang-Suk,Cho, Hee-Chan,Ahn, Ji-Whan 한국암반공학회 2009 Geosystem engineering Vol.12 No.1
Municipal solid waste incineration(MSWI) bottom ash consists of glassy materials, ceramics, ferrous materials mainly. Therefore, in some European countries, it is used as construction material. But, the bottom ash is more considered as a chemically reactive material that releases hazardous heavy metals. In order to manage the bottom ash, understanding of the carbonation process is necessary. Because their influence on carbonation reaction in bottom ash may has a significant effect on the leaching characteristics of contaminants such as heavy metals. To gain a proper appreciation of the carbonation role of mineral constituent in bottom ash, it is essential to understand the relationships between their morphology, composition and their influence on carbonation reaction. Therefore, we carried out the study on mineral constituent of bottom ash and their influence on carbonation reaction.
Han, Ji‐,Youn,Lee, Dae Ho,Lee, Sung Young,Park, Chun Gun,Kim, Hyae Young,Lee, Hong Gi,Lee, Jae Jin,Kim, Heung Tae,Lee, Jin Soo Wiley Subscription Services, Inc., A Wiley Company 2005 Cancer Vol.104 No.12
<P><B>Abstract</B></P><P><B>BACKGROUND</B></P><P>A Phase II study was conducted to evaluate the efficacy and toxicity of an irinotecan plus capecitabine combination, a new nonplatinum regimen, in chemonaive patients with advanced nonsmall cell lung carcinoma (NSCLC).</P><P><B>METHODS</B></P><P>Between July 2003 and April 2004, 53 patients with a histologically confirmed diagnosis of NSCLC were enrolled. All but 5 patients were male, 52 (98%) had an Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0 or 1, 39 (74%) had AJCC Stage IV disease, and the median age was 61 years. Treatment consisted of intravenous irinotecan at a dose of 90 mg/m<SUP>2</SUP> on Days 1 and 8 and oral capecitabine at a dose of 1000 mg/m<SUP>2</SUP> twice daily on Days 1–14 of each 21‐day cycle, given up to 12 cycles.</P><P><B>RESULTS</B></P><P>Of 53 patients enrolled, 22 achieved objective tumor responses (all partial responses) for an overall response rate of 41.5% (95% confidence interval [95% CI], 28.2–54.8%). After a median follow‐up of 17.4 months, the median survival was 14.6 months with a 1‐year survival rate of 60.1% (95% CI, 46.9–73.4%) and a median progression‐free survival of 5.1 months. Treatment was very well tolerated, with only 10% of patients experiencing NCI‐CTC Grade 3 or 4 toxicities. The most common toxicities were hand–foot syndrome and diarrhea. In multiple logistic regression analysis for overall response, only the stage predicted for significantly better response (<I>P</I> = 0.04). Squamous cell carcinoma was marginally predictive for better response (<I>P</I> = 0.08).</P><P><B>CONCLUSIONS</B></P><P>The irinotecan plus capecitabine regimen demonstrated an antitumor activity that is favorably comparable with other commonly used cisplatin‐based regimens. Given the mild toxicity profile and favorable survival outcome, this nonplatinum regimen warrants further evaluation in a randomized trial. Cancer 2005. © 2005 American Cancer Society.</P>
A Study on Characteristics of Atmospheric Heavy Metals in Subway Station
Chun-Huem Kim,Dong-Chul Yoo,Young-Min Kwon,Woong-Soo Han,Gi-Sun Kim,Mi-Jung Park,Young Soon Kim,Dalwoong Choi 한국독성학회 2010 Toxicological Research Vol.26 No.2
In this study, we investigated the atmospheric heavy metal concentrations in the particulate matter inside the subway stations of Seoul. In particular, we examined the correlation between the heavy metals and studied the effect of the heavy metals on cell proliferation. In six selected subway stations in Seoul, particulate matter was captured at the platforms and 11 types of heavy metals were analyzed. The results showed that the mean concentration of iron was the highest out of the heavy metals in particulate matter, followed by copper, potassium, calcium, zinc, nickel, sodium, manganese, magnesium, chromium and cadmium in that order. The correlation analysis showed that the correlations between the heavy metals was highest in the following order: (Cu vs Zn), (Ca vs Na), (Ca vs Mn), (Ni vs Cr), (Na vs Mn), (Cr vs Cd), (Zn vs Cd), (Cu vs Cd), (Ni vs Cd), (Cu vs Ni), (K vs Zn), (Cu vs K), (Cu vs Cr), (K vs Cd), (Zn vs Cr), (K vs Ni), (Zn vs Ni), (K vs Cr), and (Fe vs Cu). The correlation coefficient between zinc and copper was 0.937, indicating the highest correlation. Copper, zinc, nickel, chromium and cadmium, which are generated from artificial sources in general, showed correlations with many of the other metals and the correlation coefficients were also relatively high. The effect of the heavy metals on cell proliferation was also investigated in this study. Cultured cell was exposed to 10 ㎎/l or 100 ㎎/l of iron, copper, calcium, zinc, nickel, manganese, magnesium, chromium and cadmium for 24 hours. The cell proliferation in all the heavy metal-treated groups was not inhibited at 10 ㎎/l of the heavy metal concentration. The only exception to this was with the cadmium-treated group which showed a strong cell proliferation inhibition. This study provides the fundamental data for the understanding of simultaneous heavy metal exposure tendency at the time of particulate matter exposure in subway stations and the identification of heavy metal sources. Moreover, this study can be used as the fundamental data for the cell toxicity study of the subway-oriented heavy metalcontaining particulate matter.
Intradiploic Epidermoid Cyst of the Skull
Han, Gi-Young,Won, Yu-Sam,Yang, Jae-Young,Choi, Chun-Sik The Korean Neurosurgical Society 2005 Journal of Korean neurosurgical society Vol.38 No.1
Intradiploic epidermoid cysts, like epidermoid cysts in other cranial locations, are rare. Approximately 100 intradiploic epidermoids have been reported, involving all of the cranial bones in proportion to their relative sizes. Over half erode through both tables of the cranium, creating variably sized areas of unprotected brain beneath the soft tumor. We report a case of an intradiploic epidermoid cyst of the right parietal bone that was found after minor head trauma.
Han, Ji-Youn,Lee, Dae Ho,Lee, Sung Young,Park, Chun Gun,Kim, Hae Young,Kim, Eun-A,Yoon, Sung Min,Lee, Hong Gi,Lee, Jin Soo Science and Technology Letters 2005 MEDICAL ONCOLOGY -NORTHWOOD THEN BASINGSTOKE THEN Vol.22 No.3
<P>Irinotecan/cisplatin (IP) is an active regimen for extensive-disease small-cell lung cancer (ED-SCLC). However, the optimal dose/schedule is unsettled. To evaluate the efficacy and safety of a dose-intensified, weekly concomitant administration of IP, we conducted a phase II study in chemo-naive patients with ED-SCLC. Between October 2001 and February 2004, 37 patients were enrolled. Twenty-nine (78%) were male, 21 (57%) had ECOG PS 0 or 1, and the median age was 62 yr. The initial six patients received cisplatin 50 mg/m2 followed by irinotecan 90 mg/m2 iv on d 1 and 8 of a 21-d cycle (dose level I), with one treatment-related death, three febrile neutropenias. Thereafter, the doses of cisplatin and irinotecan were reduced to 40 mg/m2 and 80 mg/m2, respectively (dose level II). The treatment was continued for up to six cycles. The overall response rate was 97%, with a complete response (CR) rate of 26%. The median duration of response was 6.4 mo (range, 1.6-13.1 mo). At a median follow-up of 27.3 mo, the median survival time was 11.1 mo and 1- and 2-yr survival rates were 44.1% and 11.8%, respectively. The median progression-free survival (PFS) was 6.0 mo (range, 1.5-13.1 mo) and 1-year PFS rate was 7%. Major grade 3 or 4 toxicities included neutropenia (89%), anemia (59%), and diarrhea (27%). Despite of significant myelosuppresion, this dose-intensified weekly concomitant administration of cisplatin and irinotecan was feasible. This dose-schedule showed promising activity with high rate of complete remission in patients with ED-SCLC.</P>