Potassium Capture by Kaolin, Part 1: KOH

Guoliang Wang*, Peter Arendt Jensen, Hao Wu, Flemming Jappe Frandsen, Bo Sander, Peter Glarborg

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

165 Downloads (Pure)

Abstract

The reaction of gaseous KOH with kaolin and mullite powder under suspension-fired conditions was studied by entrained flow reactor (EFR) experiments. A water-based slurry containing kaolin/mullite and KOH was fed into the reactor and the reacted solid samples were analyzed to quantify the K-capture level. The effect of reaction temperature,K-concentration in the flue gas, and, thereby, molar ratio of K/(Al+Si) in reactants, gas residence time, and solid particle size on K-capture reaction was systematically investigated. Corresponding equilibrium calculations were conducted with FactSage 7.0. The experimental results showed that kaolin reached almost full conversion to K-aluminosilicates under suspension-fired conditions at 1100–1450 °C for a residence time of 1.2 s and a particle size of D50 = 5.47 μm. The amount of potassium captured by kaolin generally followed the equilibrium at temperatures above 1100°C, but lower conversion was observed at 800 and 900 °C. Crystalline kaliophilite (KAlSiO4) was formed at higher temperatures (1300 and 1450 °C), whereas, amorphous K-aluminosilicate was formed at lower temperatures. Coarse kaolin (D50 = 13.48 μm) captured KOH less effectively than normal (D50 = 5.47 μm) and fine(D50 = 3.51 μm) kaolin powder at1100 and 1300 °C. The difference was less significant at 900°C. Mullite generated from kaolin captured KOH less effectively than kaolin at temperatures below 1100 °C. However, at 1300 and1450 °C, the amount of potassium captured by mullite became comparable to that of kaolin.
Original languageEnglish
JournalEnergy and Fuels
Volume32
Issue number2
Pages (from-to)1851–1862
ISSN0887-0624
DOIs
Publication statusPublished - 2018

Cite this

@article{8df7ecf1ec0144d8b8c62b9ae1dad979,
title = "Potassium Capture by Kaolin, Part 1: KOH",
abstract = "The reaction of gaseous KOH with kaolin and mullite powder under suspension-fired conditions was studied by entrained flow reactor (EFR) experiments. A water-based slurry containing kaolin/mullite and KOH was fed into the reactor and the reacted solid samples were analyzed to quantify the K-capture level. The effect of reaction temperature,K-concentration in the flue gas, and, thereby, molar ratio of K/(Al+Si) in reactants, gas residence time, and solid particle size on K-capture reaction was systematically investigated. Corresponding equilibrium calculations were conducted with FactSage 7.0. The experimental results showed that kaolin reached almost full conversion to K-aluminosilicates under suspension-fired conditions at 1100–1450 °C for a residence time of 1.2 s and a particle size of D50 = 5.47 μm. The amount of potassium captured by kaolin generally followed the equilibrium at temperatures above 1100°C, but lower conversion was observed at 800 and 900 °C. Crystalline kaliophilite (KAlSiO4) was formed at higher temperatures (1300 and 1450 °C), whereas, amorphous K-aluminosilicate was formed at lower temperatures. Coarse kaolin (D50 = 13.48 μm) captured KOH less effectively than normal (D50 = 5.47 μm) and fine(D50 = 3.51 μm) kaolin powder at1100 and 1300 °C. The difference was less significant at 900°C. Mullite generated from kaolin captured KOH less effectively than kaolin at temperatures below 1100 °C. However, at 1300 and1450 °C, the amount of potassium captured by mullite became comparable to that of kaolin.",
author = "Guoliang Wang and Jensen, {Peter Arendt} and Hao Wu and {Jappe Frandsen}, Flemming and Bo Sander and Peter Glarborg",
year = "2018",
doi = "10.1021/acs.energyfuels.7b03645",
language = "English",
volume = "32",
pages = "1851–1862",
journal = "Energy & Fuels",
issn = "0887-0624",
publisher = "American Chemical Society",
number = "2",

}

Potassium Capture by Kaolin, Part 1: KOH. / Wang, Guoliang; Jensen, Peter Arendt; Wu, Hao; Jappe Frandsen, Flemming; Sander, Bo; Glarborg, Peter.

In: Energy and Fuels, Vol. 32, No. 2, 2018, p. 1851–1862.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Potassium Capture by Kaolin, Part 1: KOH

AU - Wang, Guoliang

AU - Jensen, Peter Arendt

AU - Wu, Hao

AU - Jappe Frandsen, Flemming

AU - Sander, Bo

AU - Glarborg, Peter

PY - 2018

Y1 - 2018

N2 - The reaction of gaseous KOH with kaolin and mullite powder under suspension-fired conditions was studied by entrained flow reactor (EFR) experiments. A water-based slurry containing kaolin/mullite and KOH was fed into the reactor and the reacted solid samples were analyzed to quantify the K-capture level. The effect of reaction temperature,K-concentration in the flue gas, and, thereby, molar ratio of K/(Al+Si) in reactants, gas residence time, and solid particle size on K-capture reaction was systematically investigated. Corresponding equilibrium calculations were conducted with FactSage 7.0. The experimental results showed that kaolin reached almost full conversion to K-aluminosilicates under suspension-fired conditions at 1100–1450 °C for a residence time of 1.2 s and a particle size of D50 = 5.47 μm. The amount of potassium captured by kaolin generally followed the equilibrium at temperatures above 1100°C, but lower conversion was observed at 800 and 900 °C. Crystalline kaliophilite (KAlSiO4) was formed at higher temperatures (1300 and 1450 °C), whereas, amorphous K-aluminosilicate was formed at lower temperatures. Coarse kaolin (D50 = 13.48 μm) captured KOH less effectively than normal (D50 = 5.47 μm) and fine(D50 = 3.51 μm) kaolin powder at1100 and 1300 °C. The difference was less significant at 900°C. Mullite generated from kaolin captured KOH less effectively than kaolin at temperatures below 1100 °C. However, at 1300 and1450 °C, the amount of potassium captured by mullite became comparable to that of kaolin.

AB - The reaction of gaseous KOH with kaolin and mullite powder under suspension-fired conditions was studied by entrained flow reactor (EFR) experiments. A water-based slurry containing kaolin/mullite and KOH was fed into the reactor and the reacted solid samples were analyzed to quantify the K-capture level. The effect of reaction temperature,K-concentration in the flue gas, and, thereby, molar ratio of K/(Al+Si) in reactants, gas residence time, and solid particle size on K-capture reaction was systematically investigated. Corresponding equilibrium calculations were conducted with FactSage 7.0. The experimental results showed that kaolin reached almost full conversion to K-aluminosilicates under suspension-fired conditions at 1100–1450 °C for a residence time of 1.2 s and a particle size of D50 = 5.47 μm. The amount of potassium captured by kaolin generally followed the equilibrium at temperatures above 1100°C, but lower conversion was observed at 800 and 900 °C. Crystalline kaliophilite (KAlSiO4) was formed at higher temperatures (1300 and 1450 °C), whereas, amorphous K-aluminosilicate was formed at lower temperatures. Coarse kaolin (D50 = 13.48 μm) captured KOH less effectively than normal (D50 = 5.47 μm) and fine(D50 = 3.51 μm) kaolin powder at1100 and 1300 °C. The difference was less significant at 900°C. Mullite generated from kaolin captured KOH less effectively than kaolin at temperatures below 1100 °C. However, at 1300 and1450 °C, the amount of potassium captured by mullite became comparable to that of kaolin.

U2 - 10.1021/acs.energyfuels.7b03645

DO - 10.1021/acs.energyfuels.7b03645

M3 - Journal article

VL - 32

SP - 1851

EP - 1862

JO - Energy & Fuels

JF - Energy & Fuels

SN - 0887-0624

IS - 2

ER -