Percolation segregation and flowability measurement of urea under different relative humidity conditions

Anjani K. Jha, Hojae Yi, Virendra Puri

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Dry blended fertilizers are known to segregate. Furthermore, researchers have documented that the size of blended fertilizers is the most dominant physical property contributing towards segregation. Additionally, it is known that flowability is also affected by the size and moisture content of blended fertilizers. Therefore, segregation and flowability of binary size mixtures were studied at three different equilibrium relative humidity conditions 40%, 50%, and 60% with the goal to evaluate the feasibility to mitigate segregation using moisture content. To that end, binary size mixtures were prepared using coarse and fine size urea of size ratio 2.0 and 1.7 mixed in weight proportions 33:67 and 50:50, respectively (commonly found in 10-10-10 blends). Urea is the most hygroscopic and expensive component of the blended fertilizers. Percolation segregation was quantified using the Primary Segregation Shear Cell (PSSC-II). Based on experimental results using the PSSC-II, the segregated fines mass, normalized segregation rate (NSR), and segregation rate (SR) of fines for binary urea mixtures were higher at equilibrium relative humidity of 40% vs. 50% and 60%. The NSR is defined as the amount of fines percolated from the total initial fines in the binary mixture based on the total time of PSSC-II operation (kg/kg-h). For size ratios 2.0 and 1.7, only 2.8% and 7.0% decrease in NSRs were recorded for the increase in relative humidity by 10 points (from 40% to 50%), respectively, whereas 36.0% and 45.0% decrease in NSRs were recorded for increase in relative humidity by 20 points (from 40% to 60%), respectively (P<0.5). Additionally, the flowability of binary size mixtures was quantified using a true Cubical Triaxial Tester (CTT). For size ratios 2.0 and 1.7, angle of internal friction increased from 31.3°to 35.9°to 39.0° and 27.4° to 32.0° to 36.0° when relative humidity increased from 40% to 50% to 60%, respectively. The angle of internal friction values were significantly dif ferent (P<0.05) but cohesion values, at dif ferent relative humidity conditions were not significantly dif ferent (P>0.05). Based on experimental results, relative humidity, if implemented carefully, could be used as a tool to mitigate segregation in blended fertilizers.

Original languageEnglish (US)
Pages (from-to)167-177
Number of pages11
JournalKONA Powder and Particle Journal
Volume26
Issue numberMarch
DOIs
StatePublished - Jan 1 2008

Fingerprint

Fertilizers
Urea
Atmospheric humidity
Moisture
Binary mixtures
Physical properties

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Engineering(all)

Cite this

@article{b60fe1f046a84cd397ec80e002e38b3f,
title = "Percolation segregation and flowability measurement of urea under different relative humidity conditions",
abstract = "Dry blended fertilizers are known to segregate. Furthermore, researchers have documented that the size of blended fertilizers is the most dominant physical property contributing towards segregation. Additionally, it is known that flowability is also affected by the size and moisture content of blended fertilizers. Therefore, segregation and flowability of binary size mixtures were studied at three different equilibrium relative humidity conditions 40{\%}, 50{\%}, and 60{\%} with the goal to evaluate the feasibility to mitigate segregation using moisture content. To that end, binary size mixtures were prepared using coarse and fine size urea of size ratio 2.0 and 1.7 mixed in weight proportions 33:67 and 50:50, respectively (commonly found in 10-10-10 blends). Urea is the most hygroscopic and expensive component of the blended fertilizers. Percolation segregation was quantified using the Primary Segregation Shear Cell (PSSC-II). Based on experimental results using the PSSC-II, the segregated fines mass, normalized segregation rate (NSR), and segregation rate (SR) of fines for binary urea mixtures were higher at equilibrium relative humidity of 40{\%} vs. 50{\%} and 60{\%}. The NSR is defined as the amount of fines percolated from the total initial fines in the binary mixture based on the total time of PSSC-II operation (kg/kg-h). For size ratios 2.0 and 1.7, only 2.8{\%} and 7.0{\%} decrease in NSRs were recorded for the increase in relative humidity by 10 points (from 40{\%} to 50{\%}), respectively, whereas 36.0{\%} and 45.0{\%} decrease in NSRs were recorded for increase in relative humidity by 20 points (from 40{\%} to 60{\%}), respectively (P<0.5). Additionally, the flowability of binary size mixtures was quantified using a true Cubical Triaxial Tester (CTT). For size ratios 2.0 and 1.7, angle of internal friction increased from 31.3°to 35.9°to 39.0° and 27.4° to 32.0° to 36.0° when relative humidity increased from 40{\%} to 50{\%} to 60{\%}, respectively. The angle of internal friction values were significantly dif ferent (P<0.05) but cohesion values, at dif ferent relative humidity conditions were not significantly dif ferent (P>0.05). Based on experimental results, relative humidity, if implemented carefully, could be used as a tool to mitigate segregation in blended fertilizers.",
author = "Jha, {Anjani K.} and Hojae Yi and Virendra Puri",
year = "2008",
month = "1",
day = "1",
doi = "10.14356/kona.2008015",
language = "English (US)",
volume = "26",
pages = "167--177",
journal = "KONA Powder and Particle Journal",
issn = "0288-4534",
publisher = "Hosokawa Powder Technology Foundation",
number = "March",

}

Percolation segregation and flowability measurement of urea under different relative humidity conditions. / Jha, Anjani K.; Yi, Hojae; Puri, Virendra.

In: KONA Powder and Particle Journal, Vol. 26, No. March, 01.01.2008, p. 167-177.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Percolation segregation and flowability measurement of urea under different relative humidity conditions

AU - Jha, Anjani K.

AU - Yi, Hojae

AU - Puri, Virendra

PY - 2008/1/1

Y1 - 2008/1/1

N2 - Dry blended fertilizers are known to segregate. Furthermore, researchers have documented that the size of blended fertilizers is the most dominant physical property contributing towards segregation. Additionally, it is known that flowability is also affected by the size and moisture content of blended fertilizers. Therefore, segregation and flowability of binary size mixtures were studied at three different equilibrium relative humidity conditions 40%, 50%, and 60% with the goal to evaluate the feasibility to mitigate segregation using moisture content. To that end, binary size mixtures were prepared using coarse and fine size urea of size ratio 2.0 and 1.7 mixed in weight proportions 33:67 and 50:50, respectively (commonly found in 10-10-10 blends). Urea is the most hygroscopic and expensive component of the blended fertilizers. Percolation segregation was quantified using the Primary Segregation Shear Cell (PSSC-II). Based on experimental results using the PSSC-II, the segregated fines mass, normalized segregation rate (NSR), and segregation rate (SR) of fines for binary urea mixtures were higher at equilibrium relative humidity of 40% vs. 50% and 60%. The NSR is defined as the amount of fines percolated from the total initial fines in the binary mixture based on the total time of PSSC-II operation (kg/kg-h). For size ratios 2.0 and 1.7, only 2.8% and 7.0% decrease in NSRs were recorded for the increase in relative humidity by 10 points (from 40% to 50%), respectively, whereas 36.0% and 45.0% decrease in NSRs were recorded for increase in relative humidity by 20 points (from 40% to 60%), respectively (P<0.5). Additionally, the flowability of binary size mixtures was quantified using a true Cubical Triaxial Tester (CTT). For size ratios 2.0 and 1.7, angle of internal friction increased from 31.3°to 35.9°to 39.0° and 27.4° to 32.0° to 36.0° when relative humidity increased from 40% to 50% to 60%, respectively. The angle of internal friction values were significantly dif ferent (P<0.05) but cohesion values, at dif ferent relative humidity conditions were not significantly dif ferent (P>0.05). Based on experimental results, relative humidity, if implemented carefully, could be used as a tool to mitigate segregation in blended fertilizers.

AB - Dry blended fertilizers are known to segregate. Furthermore, researchers have documented that the size of blended fertilizers is the most dominant physical property contributing towards segregation. Additionally, it is known that flowability is also affected by the size and moisture content of blended fertilizers. Therefore, segregation and flowability of binary size mixtures were studied at three different equilibrium relative humidity conditions 40%, 50%, and 60% with the goal to evaluate the feasibility to mitigate segregation using moisture content. To that end, binary size mixtures were prepared using coarse and fine size urea of size ratio 2.0 and 1.7 mixed in weight proportions 33:67 and 50:50, respectively (commonly found in 10-10-10 blends). Urea is the most hygroscopic and expensive component of the blended fertilizers. Percolation segregation was quantified using the Primary Segregation Shear Cell (PSSC-II). Based on experimental results using the PSSC-II, the segregated fines mass, normalized segregation rate (NSR), and segregation rate (SR) of fines for binary urea mixtures were higher at equilibrium relative humidity of 40% vs. 50% and 60%. The NSR is defined as the amount of fines percolated from the total initial fines in the binary mixture based on the total time of PSSC-II operation (kg/kg-h). For size ratios 2.0 and 1.7, only 2.8% and 7.0% decrease in NSRs were recorded for the increase in relative humidity by 10 points (from 40% to 50%), respectively, whereas 36.0% and 45.0% decrease in NSRs were recorded for increase in relative humidity by 20 points (from 40% to 60%), respectively (P<0.5). Additionally, the flowability of binary size mixtures was quantified using a true Cubical Triaxial Tester (CTT). For size ratios 2.0 and 1.7, angle of internal friction increased from 31.3°to 35.9°to 39.0° and 27.4° to 32.0° to 36.0° when relative humidity increased from 40% to 50% to 60%, respectively. The angle of internal friction values were significantly dif ferent (P<0.05) but cohesion values, at dif ferent relative humidity conditions were not significantly dif ferent (P>0.05). Based on experimental results, relative humidity, if implemented carefully, could be used as a tool to mitigate segregation in blended fertilizers.

UR - http://www.scopus.com/inward/record.url?scp=67650516521&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=67650516521&partnerID=8YFLogxK

U2 - 10.14356/kona.2008015

DO - 10.14356/kona.2008015

M3 - Article

VL - 26

SP - 167

EP - 177

JO - KONA Powder and Particle Journal

JF - KONA Powder and Particle Journal

SN - 0288-4534

IS - March

ER -