Optimization of the active component grinding process and hydrophobization of the obtained powder fire extinguisher

2021
Authors
Mihajlović, Slavica
Đorđević, Nataša

Jovanović, Marina N.
Vlahović, Milica

Savić, Ljubinko
Patarić, Aleksandra

Blagojev, Marina S.
Article (Published version)
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This work presents a grinding process of monoammonium phosphate (MAP) as an active component in a powder fire extinguisher (PFE). The aim was to determine the grinding time for reaching the optimal particle size of MAP necessary for permanent fire extinguishing. MAP grinding was performed by using a laboratory ceramic ball mill and a vibrating cup mill. The grinding process was controlled by sieving using a 100 mu m sieve at precisely defined time intervals. The efficiency of a PFE depends on the share of the-100 mu m fraction of the active component, which has to exceed 60 %. The optimal grain size with 64 % of fraction of particle size-100 mu m was obtained after 33 min of grinding of =3000 mu m mm grain size MAP by using a ball mill (single-stage grinding). In two-stage process, by grinding the same initial MAP sample (=3000 mu m) in the vibro mill for 10 min, powder with the upper limit grain size of 300 mu m and the mean grain diameter of 120 mu m was obtained. This sample with a ...reduced size was further ground in the ceramic ball mill yielding 67.5 % of the fraction of particle size 100 mu m after 19 min. The total time of the two-stage grinding process was 29 min. By analyzing the grinding time of MAP required to get the lowest required share of the fraction of particle size-100 mu m that provides the effectiveness of formed PFE it can be concluded that 64 % of this fraction was obtained after 33 min of single-stage grinding, while only after 26 min in the two-stage process. Thus, the grinding time was reduced by 7 min indicating certain energy savings. Stability and hydrophobicity of the obtained PFE were achieved by coating with magnesium stearate (MgSt) at the content of 2 % in a ball mill for 15 min. The coating was confirmed by the standardized procedure for verification of PFE hydrophobic properties in contact with water drops. To obtained PFE had component mass ratios of MAP:AS:CC:QS:MgSt=55:20:18:5:2 (AS-ammonium sulfate; CC-calcium carbonate, QS-quartz sand) and was further characterized by chemical and granulometric analyses. The fire extinguishing efficiency of the PFE was tested in controlled conditions, whereby fires were initiated by burning solid materials and flammable liquids. In both cases, immediate elimination of flames was achieved, thus proving the efficiency of the PFE obtained in this work for practical applications..
Keywords:
monoammonium phosphate / magnesium stearate / granulometric composition / coatingSource:
Hemijska industrija, 2021, 75, 2, 65-75Publisher:
- Savez hemijskih inženjera, Beograd
Funding / projects:
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200026 (University of Belgrade, Institute of Chemistry, Technology and Metallurgy - IChTM) (RS-200026)
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200023 (Institute of Technology of Nuclear and Other Mineral Row Materials - ITNMS, Belgrade) (RS-200023)
DOI: 10.2298/HEMIND210114012M
ISSN: 0367-598X
WoS: 000651595700001
Scopus: 2-s2.0-85105417717
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Institution/Community
Institut za tehnologiju nuklearnih i drugih mineralnih sirovinaTY - JOUR AU - Mihajlović, Slavica AU - Đorđević, Nataša AU - Jovanović, Marina N. AU - Vlahović, Milica AU - Savić, Ljubinko AU - Patarić, Aleksandra AU - Blagojev, Marina S. PY - 2021 UR - https://ritnms.itnms.ac.rs/handle/123456789/592 AB - This work presents a grinding process of monoammonium phosphate (MAP) as an active component in a powder fire extinguisher (PFE). The aim was to determine the grinding time for reaching the optimal particle size of MAP necessary for permanent fire extinguishing. MAP grinding was performed by using a laboratory ceramic ball mill and a vibrating cup mill. The grinding process was controlled by sieving using a 100 mu m sieve at precisely defined time intervals. The efficiency of a PFE depends on the share of the-100 mu m fraction of the active component, which has to exceed 60 %. The optimal grain size with 64 % of fraction of particle size-100 mu m was obtained after 33 min of grinding of =3000 mu m mm grain size MAP by using a ball mill (single-stage grinding). In two-stage process, by grinding the same initial MAP sample (=3000 mu m) in the vibro mill for 10 min, powder with the upper limit grain size of 300 mu m and the mean grain diameter of 120 mu m was obtained. This sample with a reduced size was further ground in the ceramic ball mill yielding 67.5 % of the fraction of particle size 100 mu m after 19 min. The total time of the two-stage grinding process was 29 min. By analyzing the grinding time of MAP required to get the lowest required share of the fraction of particle size-100 mu m that provides the effectiveness of formed PFE it can be concluded that 64 % of this fraction was obtained after 33 min of single-stage grinding, while only after 26 min in the two-stage process. Thus, the grinding time was reduced by 7 min indicating certain energy savings. Stability and hydrophobicity of the obtained PFE were achieved by coating with magnesium stearate (MgSt) at the content of 2 % in a ball mill for 15 min. The coating was confirmed by the standardized procedure for verification of PFE hydrophobic properties in contact with water drops. To obtained PFE had component mass ratios of MAP:AS:CC:QS:MgSt=55:20:18:5:2 (AS-ammonium sulfate; CC-calcium carbonate, QS-quartz sand) and was further characterized by chemical and granulometric analyses. The fire extinguishing efficiency of the PFE was tested in controlled conditions, whereby fires were initiated by burning solid materials and flammable liquids. In both cases, immediate elimination of flames was achieved, thus proving the efficiency of the PFE obtained in this work for practical applications.. PB - Savez hemijskih inženjera, Beograd T2 - Hemijska industrija T1 - Optimization of the active component grinding process and hydrophobization of the obtained powder fire extinguisher EP - 75 IS - 2 SP - 65 VL - 75 DO - 10.2298/HEMIND210114012M UR - conv_910 ER -
@article{ author = "Mihajlović, Slavica and Đorđević, Nataša and Jovanović, Marina N. and Vlahović, Milica and Savić, Ljubinko and Patarić, Aleksandra and Blagojev, Marina S.", year = "2021", abstract = "This work presents a grinding process of monoammonium phosphate (MAP) as an active component in a powder fire extinguisher (PFE). The aim was to determine the grinding time for reaching the optimal particle size of MAP necessary for permanent fire extinguishing. MAP grinding was performed by using a laboratory ceramic ball mill and a vibrating cup mill. The grinding process was controlled by sieving using a 100 mu m sieve at precisely defined time intervals. The efficiency of a PFE depends on the share of the-100 mu m fraction of the active component, which has to exceed 60 %. The optimal grain size with 64 % of fraction of particle size-100 mu m was obtained after 33 min of grinding of =3000 mu m mm grain size MAP by using a ball mill (single-stage grinding). In two-stage process, by grinding the same initial MAP sample (=3000 mu m) in the vibro mill for 10 min, powder with the upper limit grain size of 300 mu m and the mean grain diameter of 120 mu m was obtained. This sample with a reduced size was further ground in the ceramic ball mill yielding 67.5 % of the fraction of particle size 100 mu m after 19 min. The total time of the two-stage grinding process was 29 min. By analyzing the grinding time of MAP required to get the lowest required share of the fraction of particle size-100 mu m that provides the effectiveness of formed PFE it can be concluded that 64 % of this fraction was obtained after 33 min of single-stage grinding, while only after 26 min in the two-stage process. Thus, the grinding time was reduced by 7 min indicating certain energy savings. Stability and hydrophobicity of the obtained PFE were achieved by coating with magnesium stearate (MgSt) at the content of 2 % in a ball mill for 15 min. The coating was confirmed by the standardized procedure for verification of PFE hydrophobic properties in contact with water drops. To obtained PFE had component mass ratios of MAP:AS:CC:QS:MgSt=55:20:18:5:2 (AS-ammonium sulfate; CC-calcium carbonate, QS-quartz sand) and was further characterized by chemical and granulometric analyses. The fire extinguishing efficiency of the PFE was tested in controlled conditions, whereby fires were initiated by burning solid materials and flammable liquids. In both cases, immediate elimination of flames was achieved, thus proving the efficiency of the PFE obtained in this work for practical applications..", publisher = "Savez hemijskih inženjera, Beograd", journal = "Hemijska industrija", title = "Optimization of the active component grinding process and hydrophobization of the obtained powder fire extinguisher", pages = "75-65", number = "2", volume = "75", doi = "10.2298/HEMIND210114012M", url = "conv_910" }
Mihajlović, S., Đorđević, N., Jovanović, M. N., Vlahović, M., Savić, L., Patarić, A.,& Blagojev, M. S.. (2021). Optimization of the active component grinding process and hydrophobization of the obtained powder fire extinguisher. in Hemijska industrija Savez hemijskih inženjera, Beograd., 75(2), 65-75. https://doi.org/10.2298/HEMIND210114012M conv_910
Mihajlović S, Đorđević N, Jovanović MN, Vlahović M, Savić L, Patarić A, Blagojev MS. Optimization of the active component grinding process and hydrophobization of the obtained powder fire extinguisher. in Hemijska industrija. 2021;75(2):65-75. doi:10.2298/HEMIND210114012M conv_910 .
Mihajlović, Slavica, Đorđević, Nataša, Jovanović, Marina N., Vlahović, Milica, Savić, Ljubinko, Patarić, Aleksandra, Blagojev, Marina S., "Optimization of the active component grinding process and hydrophobization of the obtained powder fire extinguisher" in Hemijska industrija, 75, no. 2 (2021):65-75, https://doi.org/10.2298/HEMIND210114012M ., conv_910 .