Effect of Al Dross Addition on Temperature Improvements in Molten Steel by Blowing Dry Air
Round 1
Reviewer 1 Report
This is a very interesting research regarding the Al dross addition on temperature improvement in molten steel, the reviewer almost does not have any comment, few minor suggestions could be considered below:
1. Line 26, it is saying ‘23% CO2 emission is produced by steel industry’, and this is the 2017 index results. Does the author can find the latest statistical data? But this is not the mandatory request.
2. Table 2 shows the chemical composition of Al dross measured by ICP, what is the measurement tolerance?
3. Line 121, MIBK is the first time appeared, it should give the full name of this.
4. Besides, there are few detailed comments the review can mention, e.g.
Figure 17, the scale bar is missing.
Line 346, ‘a’ is missing between ‘in’ and ‘good’.
Line 347, ‘the’ is missing between ‘In’ and ‘future’.
Caption of Figure 19, ‘data’ should be removed.
Etc.
The author need check more in details before publish it.
Author Response
The author greatly appreciates the precious comments of reviewers and have attempted to address all issues. The details of our answers and the revised section in our manuscript are represented `BLUE` and `RED’, respectively.
Reviewer 1
This is a very interesting research regarding the Al dross addition on temperature improvement in molten steel, the reviewer almost does not have any comment, few minor suggestions could be considered below:
|
Al |
Fe |
Sn |
Zn |
SiO2 |
Al2O3 |
|
27.02 |
0.16 |
0.01 |
0.03 |
7.00 |
65.78 |
1.Line 26, it is saying ‘23% CO2 emission is produced by steel industry’, and this is the 2017 index results. Does the author can find the latest statistical data? But this is not the mandatory request.
It well-known that the reduction of CO2 emission is very important issues in world steel industry. By researching the latest statistical data for the reduction of CO2 emission, it can be found that most of countries have the standard for the CO2 emission in 2017. Furthermore, in steel industry, the CO2 emission is related with the production amount of crude steel. In south Korea, the production amount of crude steel has not been significantly changed since 2017, even though the production amount of crude steel in 2021 decreased by ~15% compared to that in 2017 due to COVID-19. Therefore, unfortunately, the author could not find the new standard of CO2 emission, but we appreciate the precious comments of reviewers.
2. Table 2 shows the chemical composition of Al dross measured by ICP, what is the measurement tolerance?
The author greatly appreciates the precious comment of reviewer. The chemical composition of Al-dross was revised by the second place to the right of the decimal point. Because of the very tiny contents of Ni below the measurement tolerance, Table 2 was revised as follows;
Please, see the attached word file.
- Line 121, MIBK is the first time appeared, it should give the full name of this.
Full name of MIBK is Methyl isobutyl ketone, and the manuscript in Line 121 was revised as follows;
Iron was separated from the sample solution using MIBK( Methyl isobutyl ketone).
- Besides, there are few detailed comments the review can mention, e.g.
- Figure 17, the scale bar is missing.
In figure 17, the author represents the scale bar as follows:
Please, see the attached word file.
- Line 346, ‘a’ is missing between ‘in’ and ‘good’.
The author revised the text in line 346 as follows:
The simulated and measured results of the changes in the molten steel temperature and the aluminum and carbon contents of molten steel were in a good agreement.
- Line 347, ‘the’ is missing between ‘In’ and ‘future’.
The author revised the text in line 347 as follows:
In the future, the electric energy consumed in the EAF process may be reduced using Al dross and coke mixtures.
- Caption of Figure 19, ‘data’ should be removed.
The author revised the caption of Figure 19 as follows:
Figure 19. X-ray diffraction analysis for slag.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Currently, production waste is widely used in order to reduce the cost of steel. The authors of the article analyzed the process of using aluminum slags in steelmaking. Aluminum slag contains up to 27% metallic aluminum and, according to the authors of the article, this slag can be used as a charge in steelmaking. The complexity of the problem lies in the fact that aluminum slag is heterogeneous in its chemical composition. The authors of the article, however, believe that it is possible to increase the efficiency of the rational use of charge materials by using waste aluminum production and carbon-graphite materials. I believe that the article is written on a relevant topic and will be of interest to a wide range of researchers. The article presents in detail the design of a high-temperature installation, which made it possible to obtain reliable results of heat balances, the necessary experimental and calculated values ​​of carbon and aluminum concentrations in molten steel. I believe that the material of the article is of interest to scientists working in the field of creating perfect environmentally necessary technologies. In fact, it was necessary to solve the problem of distributing carbon, oxygen, aluminum between metal and slag. The physicochemical parameters obtained in the article will undoubtedly arouse interest among physicochemists working in the field of metallurgical thermodynamics and kinetics.
The only thing I missed was the final conclusion on the work. Based on the work done, good conclusions are given, but I would like to understand whether this study has been completed or whether there will be continuation and development.
Author Response
The author greatly appreciates the precious comments of reviewer and have attempted to address all issues. The use of Al-dross in the steel industry has not been completed yet and we try to investigate the expanded application of heating source for the improvement of chemical energy. One of our research issues is that the production of Fe source from mixtures of Al-dross and the Fe included by product of steel industry by thermite reaction, and the mixtures are very powerful heating source. Furthermore, we have cooperation with steel company for the application of mixtures in EAF. In near future, those results will be reported.
