| 1 | Thermodynamics calculation on the oxidation and sulfur removal abilities of slag in EAF dust pellet reduction process显示文摘The valuable metals in the dust can be recycled by mixing it with reducing agent carbon and lignosulfonate as the binder to make pellets, then returning the pellets to electric arc furnace (EAF) and adding ferro silicon. Part of valuable metals in the dust is reduced by carbon and part of them reduced by ferro silicon for the economical consideration. The reduced metals get into the steel in the stainless steel or special steel production. But the sulfur in the lignosulfonate may affect the quality of produced steel, which is dependent on the status of the smelting slag. The experiments were conducted in the way of changing the ratio of start iron, pellets, ferro silicon and lime. The content of the slag was checked by XRF for the calculation thermodynamics study. The active concentrations of materials in the slag, the slag abilities of oxidation and sulfur removal in EAF dust reduction process were determined by thermodynamics calculation study on CaO MgO FeO Fe 2O 3 SiO 2 S slag at 1 550 ℃. The oxidation ability of slag can be expressed as N (FetO)= N (FeO)+6 N (Fe 2O 3)+8 N (Fe 3O 4). The sulfur removal ability is dependent on the amount of added ferro silicon and the basicity of the slag. The calculation thermodynamics model was set up and it could be applied to the practical production. | PENG Bing 1,PENG Ji 1,ZHANG Chuan fu 1,Jonathan Lobel 2,Janusz A. Kozinski 2 (1 Department of Metallurgical Science and Engineering, Central South University, Changsha 410083, China 2 Department of Metallurgical Engineering, McGill University | 2001 | Journal of Central South University of Technology2001，8，1： | 6 |
| 4 | Functional remodeling of Ca^(2+)-activated Cl^-channel in pacing induced canine failing heart显示文摘To determine whether Ca2+ activated Cl-current (ICl(Ca)) contributes to the functional remodeling of the failing heart. Methods Whole cell patch-clamp recording technique was employed to record the ICl(Ca) in cardiac myocytes enzymatically isolated from rapidly pacing induced canine failing hearts at room temperature and compared that of the normal hearts (Nor).Results The current density of DIDS (200M) sensitive ICl(Ca) induced by intracellular Ca2+ release trigged by L-type Ca2+ current (ICa,L) was significantly decreased in heart failare (HF) cells compared to Nor cells.At membrane voltage of 20mV,the ICl(Ca) density was 3.02±0. 54 pA/pF in Nor (n=6) vs.1.31±0.25 pA/pF in HF (n=8) cells,(P<0.01),while the averaged ICa,L density did not show difference between two groups.The time constant of current decay of ICl(Ca) was similar in both types of cells.On the other hand,in intra cellular Ca2+ clamped mode,where the [Ca2+]i was maintained at 100nmol/L,ICl(Ca) density be increased significantly in HF cells when the membrane voltage at +30mV or higher.Conclusions Our results suggest that ICl(Ca) density was decreased in pacing induced failing heart but the channel function be enhanced.Impaired Ca2+ handing in HF cells rather than reduced ICl(Ca) channel function itself may have caused this abnormality.The ICl(Ca) density reduction might contribute to the prolongation of action potential in failing heart.The ICl(Ca) channel function up-regulation is likely to cause cardiac arrhythmia by inducing a delayed after depolarization,when Ca2+ overload occurred in diastolic failing heart cells. | Ning Li,~1 Kejuan Ma,~2 Siyong Teng,~2 Jonathan C.Makielski,~3 Jielin Pu~(1,2) 1. Research Center for Pathology and Physiology, Fu Wai Cardiovascular Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China 2. Center for Arrhythmia Diagnosis and Treatment, Fu Wai Cardiovascular Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China 3. Department of Cardiology, University of wisconsin, Madison 53706, USA | 2008 | Journal of Geriatric Cardiology2008，5，3： | 1 |
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