Performance of separation processes for precipitated calcium carbonate produced with an innovative method from steelmaking slag and carbon dioxide

Sebastian Teir (Corresponding Author), Toni Auvinen, Arshe Said, Tuukka Kotiranta, Heljä Peltola

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

In this work, experiments were performed to determine the filterability of calcium carbonate produced with an alternative calcium carbonate production concept. The concept uses steelmaking slag as raw material and has potential to fix CO2 emissions and utilize steelmaking slag, simultaneously. As calcium carbonate is precipitated in a solution containing ammonium chloride, calcium chloride, and ammonia, the product needs to be washed and hence filtered. In this work, different separation processes, including washing, filtering, and drying, were tested on two calcium carbonate slurries produced from steel converter slag and CO2 by a laboratory-scale pilot facility, with the aim of obtaining a solid product with a low chloride content using a minimum amount of washing water. The order of maximum filtration rates achievable of the calcium carbonate slurries was determined by experimental work. The tests included pressure filtration and vacuum filtration and the test series contained altogether 21 different filtration cycles with varying combinations of filtering, washing, and drying steps. The filtered cakes were analyzed by their residual moisture content, chloride content, and conductivity, and the filtrates by their residual solids content, chloride content, and conductivity. Pressure filtration gave a high capacity (400-460 kg/m2h) and a low cake residual moisture content (12-14 wt-%). Vacuum filtration gave slightly higher filtration rates (500-610 kg/m2h at the lowest residual chloride contents of the cakes), but the cake residual moisture also stayed higher (25-26 wt-%). As the vacuum filtration tests used a filter cloth with higher permeability than that of the pressure filtration tests, a slightly higher filtration rate was expected. However, both filtration technologies seem suitable for filtering and washing calcium carbonate prepared with the studied method as a residual chloride content as low as 10 ppm of the filtered solids can be achieved with quite a small amount of washing water and the filtration rate is fast.
Original languageEnglish
Article number6
JournalFrontiers in Energy Research
Volume4
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Steelmaking
Calcium carbonate
Slags
Carbon dioxide
Washing
Moisture
Calcium
Slurries
Vacuum
Drying
Calcium chloride
Water
Ammonia

Keywords

  • mineralization
  • carbon dioxide
  • CCU
  • utilization
  • filtration
  • PCC
  • GCC

Cite this

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title = "Performance of separation processes for precipitated calcium carbonate produced with an innovative method from steelmaking slag and carbon dioxide",
abstract = "In this work, experiments were performed to determine the filterability of calcium carbonate produced with an alternative calcium carbonate production concept. The concept uses steelmaking slag as raw material and has potential to fix CO2 emissions and utilize steelmaking slag, simultaneously. As calcium carbonate is precipitated in a solution containing ammonium chloride, calcium chloride, and ammonia, the product needs to be washed and hence filtered. In this work, different separation processes, including washing, filtering, and drying, were tested on two calcium carbonate slurries produced from steel converter slag and CO2 by a laboratory-scale pilot facility, with the aim of obtaining a solid product with a low chloride content using a minimum amount of washing water. The order of maximum filtration rates achievable of the calcium carbonate slurries was determined by experimental work. The tests included pressure filtration and vacuum filtration and the test series contained altogether 21 different filtration cycles with varying combinations of filtering, washing, and drying steps. The filtered cakes were analyzed by their residual moisture content, chloride content, and conductivity, and the filtrates by their residual solids content, chloride content, and conductivity. Pressure filtration gave a high capacity (400-460 kg/m2h) and a low cake residual moisture content (12-14 wt-{\%}). Vacuum filtration gave slightly higher filtration rates (500-610 kg/m2h at the lowest residual chloride contents of the cakes), but the cake residual moisture also stayed higher (25-26 wt-{\%}). As the vacuum filtration tests used a filter cloth with higher permeability than that of the pressure filtration tests, a slightly higher filtration rate was expected. However, both filtration technologies seem suitable for filtering and washing calcium carbonate prepared with the studied method as a residual chloride content as low as 10 ppm of the filtered solids can be achieved with quite a small amount of washing water and the filtration rate is fast.",
keywords = "mineralization, carbon dioxide, CCU, utilization, filtration, PCC, GCC",
author = "Sebastian Teir and Toni Auvinen and Arshe Said and Tuukka Kotiranta and Helj{\"a} Peltola",
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journal = "Frontiers in Energy Research",
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Performance of separation processes for precipitated calcium carbonate produced with an innovative method from steelmaking slag and carbon dioxide. / Teir, Sebastian (Corresponding Author); Auvinen, Toni; Said, Arshe; Kotiranta, Tuukka; Peltola, Heljä.

In: Frontiers in Energy Research, Vol. 4, 6, 2016.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Performance of separation processes for precipitated calcium carbonate produced with an innovative method from steelmaking slag and carbon dioxide

AU - Teir, Sebastian

AU - Auvinen, Toni

AU - Said, Arshe

AU - Kotiranta, Tuukka

AU - Peltola, Heljä

N1 - Project code: 100373

PY - 2016

Y1 - 2016

N2 - In this work, experiments were performed to determine the filterability of calcium carbonate produced with an alternative calcium carbonate production concept. The concept uses steelmaking slag as raw material and has potential to fix CO2 emissions and utilize steelmaking slag, simultaneously. As calcium carbonate is precipitated in a solution containing ammonium chloride, calcium chloride, and ammonia, the product needs to be washed and hence filtered. In this work, different separation processes, including washing, filtering, and drying, were tested on two calcium carbonate slurries produced from steel converter slag and CO2 by a laboratory-scale pilot facility, with the aim of obtaining a solid product with a low chloride content using a minimum amount of washing water. The order of maximum filtration rates achievable of the calcium carbonate slurries was determined by experimental work. The tests included pressure filtration and vacuum filtration and the test series contained altogether 21 different filtration cycles with varying combinations of filtering, washing, and drying steps. The filtered cakes were analyzed by their residual moisture content, chloride content, and conductivity, and the filtrates by their residual solids content, chloride content, and conductivity. Pressure filtration gave a high capacity (400-460 kg/m2h) and a low cake residual moisture content (12-14 wt-%). Vacuum filtration gave slightly higher filtration rates (500-610 kg/m2h at the lowest residual chloride contents of the cakes), but the cake residual moisture also stayed higher (25-26 wt-%). As the vacuum filtration tests used a filter cloth with higher permeability than that of the pressure filtration tests, a slightly higher filtration rate was expected. However, both filtration technologies seem suitable for filtering and washing calcium carbonate prepared with the studied method as a residual chloride content as low as 10 ppm of the filtered solids can be achieved with quite a small amount of washing water and the filtration rate is fast.

AB - In this work, experiments were performed to determine the filterability of calcium carbonate produced with an alternative calcium carbonate production concept. The concept uses steelmaking slag as raw material and has potential to fix CO2 emissions and utilize steelmaking slag, simultaneously. As calcium carbonate is precipitated in a solution containing ammonium chloride, calcium chloride, and ammonia, the product needs to be washed and hence filtered. In this work, different separation processes, including washing, filtering, and drying, were tested on two calcium carbonate slurries produced from steel converter slag and CO2 by a laboratory-scale pilot facility, with the aim of obtaining a solid product with a low chloride content using a minimum amount of washing water. The order of maximum filtration rates achievable of the calcium carbonate slurries was determined by experimental work. The tests included pressure filtration and vacuum filtration and the test series contained altogether 21 different filtration cycles with varying combinations of filtering, washing, and drying steps. The filtered cakes were analyzed by their residual moisture content, chloride content, and conductivity, and the filtrates by their residual solids content, chloride content, and conductivity. Pressure filtration gave a high capacity (400-460 kg/m2h) and a low cake residual moisture content (12-14 wt-%). Vacuum filtration gave slightly higher filtration rates (500-610 kg/m2h at the lowest residual chloride contents of the cakes), but the cake residual moisture also stayed higher (25-26 wt-%). As the vacuum filtration tests used a filter cloth with higher permeability than that of the pressure filtration tests, a slightly higher filtration rate was expected. However, both filtration technologies seem suitable for filtering and washing calcium carbonate prepared with the studied method as a residual chloride content as low as 10 ppm of the filtered solids can be achieved with quite a small amount of washing water and the filtration rate is fast.

KW - mineralization

KW - carbon dioxide

KW - CCU

KW - utilization

KW - filtration

KW - PCC

KW - GCC

U2 - 10.3389/fenrg.2016.00006

DO - 10.3389/fenrg.2016.00006

M3 - Article

VL - 4

JO - Frontiers in Energy Research

JF - Frontiers in Energy Research

SN - 2296-598X

M1 - 6

ER -