Effect of Additives on Desulfurization Capability of CAS-OB Refining Ladle Slag

2011 ◽  
Vol 311-313 ◽  
pp. 962-965
Author(s):  
Hong Ming Wang ◽  
Ting Wang Zhang ◽  
Li Li Yang ◽  
Yong Qi Yan ◽  
Hua Zhu
Keyword(s):  
Liquid Steel ◽  
Sulphur Content ◽  
Mass Ratio ◽  
Ladle Slag ◽  
Effect Of Additives ◽  
Partition Equilibrium

To avoid slag sticking onto the ladle snorkel during the CAS-OB refining and alloying process, CaO-B2O3 and CaO-CaF2 were respectively employed as modifiers added into the ladle slag. The desulfurization capability of modified slag was investigated. The results of experiments on sulphur partition equilibrium between metal and slag indicate that the sulphur content of metal can be further decreased by the modified slag. When CaO-B2O3 is used as additive and the mass ratio of CaO to B2O3 is 1:1, the desulfurization ratio of slag to liquid steel is 50%, the final sulphur content can be controlled at 0.002%. The efficiency of desulfurization is fine. When CaO- CaF2 is employed as additive and the mass ratio of CaF2 to CaO is 2:8, the final sulphur content of metal can be controlled lower than 0.004%, the efficiency of desulfurization is also acceptable.

Effect of B2O3 and CaF2 on Viscosity of Ladle Refining Slag

2011 ◽  
Vol 295-297 ◽  
pp. 2647-2650 ◽  
Author(s):  
Hong Ming Wang ◽  
Ting Wang Zhang ◽  
Hua Zhu ◽  
Yong Qi Yan ◽  
Yi Nan Zhao
Keyword(s):  
Refining Process ◽  
Slag Viscosity ◽  
Mass Ratio ◽  
Refining Slag ◽  
Ladle Refining ◽  
Ladle Slag ◽  
Viscosity Measurements ◽  
Cylinder Method

To avoid slag sticking onto the snorkel during CAS-OB ladle refining process, B2O3-CaO(mass ratio equals 1:1) and CaF2-CaO(mass ratio equals 1:1) were respectively employed as modifiers added to decrease the viscosity of ladle slag. The rotary cylinder method was adopted in the viscosity measurements. The results showed that the modifiers could decrease the viscosity of ladle refining slag remarkably. At 1500°C, the viscosity of ladle slag without any modifiers is about 6.0 Pa·s. But by adding more than 10mass% CaO-B2O3 or CaO-CaF2, the slag viscosity at 1500°C could be decreased lower than 1.0 Pa·s. The mechanism of modifiers decreasing the slag viscosity was analyzed.

scholarly journals Effect of Additives on Viscosity of LATS Refining Ladle Slag

2006 ◽  
Vol 46 (5) ◽  
pp. 637-640 ◽  
Author(s):  
Hongming Wang ◽  
Guirong Li ◽  
Qixun Dai ◽  
Yucheng Lei ◽  
Yutao Zhao ◽  
...  
Keyword(s):  
Ladle Slag ◽  
Effect Of Additives

Effect of Ladle Slag Modification on Slag Sticking to Snorkel and Rate of Slag Erosion

2011 ◽  
Vol 402 ◽  
pp. 179-182
Author(s):  
Hong Ming Wang ◽  
Dao Xin Zhang ◽  
Yong Qi Yan ◽  
Mian Zhang ◽  
Gui Rong Li ◽  
...  
Keyword(s):  
Erosion Rate ◽  
Total Weight ◽  
Test Results ◽  
Mass Ratio ◽  
Optimal Weight ◽  
Ladle Slag ◽  
Slag Modification ◽  
Slag Erosion

To reduce the slag sticking to snorkel and to increase the operation life of snorkel during ladle alloying process, B2O3-CaO (mass ratio 1:2) and CaF2-CaO(mass ratio 1:2) were respectively employed as modifiers added to ladle slag. The effects of modifier on weight of sticking slag and erosion rate were investigated. The results showed that the weight of slag sticking to snorkel is reduced, but the rate of modified ladle slag pervading into snorkel is increased with the increasing of modifier added into ladle slag. The optimal weight of modifier is about 10 percent of total weight of ladle slag. The results of test in practice indicate that the slag sticking to the snorkel has been reduced by the slag modification. At the same time, the industrial applied test results show that the operation life of snorkel is increased by more than 100 percent.

Effect of Additives on Melting Point of LATS Refining Ladle Slag

2007 ◽  
Vol 14 (2) ◽  
pp. 25-29 ◽  
Author(s):  
Hong-ming Wang ◽  
Gui-rong Li ◽  
Zhen-tao Ding ◽  
Qi-xun Dai ◽  
Bo Li
Keyword(s):  
Melting Point ◽  
Ladle Slag ◽  
Effect Of Additives

scholarly journals Effect of Additives and Process Variables on Enzymatic Hydrolysis of Macauba Kernel Oil (Acrocomia aculeata)

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Djéssica Tatiane Raspe ◽  
Lúcio Cardozo Filho ◽  
Camila da Silva
Keyword(s):  
Enzymatic Hydrolysis ◽  
Reaction Medium ◽  
Mass Ratio ◽  
Process Variables ◽  
Lipozyme Tl Im ◽  
Positive Effects ◽  
Kernel Oil ◽  
Effect Of Additives ◽  
Hydrolysis Of ◽  
Temperature Water

This work investigates the production of free fatty acids (FFAs) from the enzymatic hydrolysis of macauba kernel oil. Experiments evaluate the effect of different enzymes and the addition of salts, surfactants, and solvents to the reaction medium, as well as the effect of process variables. Results showed that FFA yields obtained for use of Lipozyme RM IM were higher than those obtained from Lipozyme TL IM and Lipozyme 435. The addition of salts and surfactants did not promote increased production of FFAs, while addingn-hexane and heptane to the reaction medium led to an increased reaction rate. It can be observed for the results that the temperature, water :  oil mass ratio, and enzyme percentage had positive effects on the FFA yield in the range of 35°C to 55°C, 1 :  20 to 1 :  2, and 1 to 15%, respectively, and that, from these limits, increases in these variables did not cause significant increase in FFA yields. The addition of buffer promoted an increase in yield FFAs, as well as the pH of the buffer, and it was reported that an agitation of 400 rpm resulted in the highest yields in the investigated range.

Evaluation of the Fibrin Plate Method for Estimating Plasminogen Activators

1972 ◽  
Vol 28 (01) ◽  
pp. 075-088 ◽  
Author(s):  
N. A Marsh ◽  
C. L Arocha-Pinango
Keyword(s):  
Tranexamic Acid ◽  
Plasminogen Activators ◽  
Heated Plate ◽  
Plasminogen Activation ◽  
Response Curves ◽  
Plate Method ◽  
Single Plate ◽  
Effect Of Additives ◽  
Threefold Increase ◽  
Fibrin Plate

SummaryA study was carried out in order to evaluate the Astrup and Mullertz fibrin plate method for estimating plasminogen activators.Choice of a suitable fibrinogen substrate was found to be the most important factor in setting up a workable assay. Many preparations contained a large proportion of non-clottable protein and plates made from these fibrinogens were usually unreliable. In addition, plasminogen content varied appreciably between preparations so that sensitivity of the method required careful calibration with each new batch of fibrinogen.The effect of additives in the fibrin plate was considered and it was found that calcium chloride alone was sufficient to ensure a stabilised plate which could be stored at 4° C for some time. The addition of tranexamic acid (AMCHA) was found to be a slightly more convenient way of estimating direct proteolytic activity, compared with the traditional heated plate. However neither method distinguished completely between proteolysis and plasminogen activation.In order to improve the precision of the method, the use of an analysis of variance technique has been studied. This technique provides information on the dose-response curves of test and unknown substances, and in addition produces an approximately threefold increase in precision over single plate tests.

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