A Study on the Application Limestone Sludge to the Flue Gas Desulfurization Process

Seo, Sung Kwan; Chu, Yong; Shim, Kwang Bo; Lee, Jong Kyu; Song, Hongbo; Yun, Young Min

doi:10.4191/kcers.2014.51.6.575

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…During this process, small limestone particles (<1 mm) are separated by precipitation and thus lime stone sludge (LSS) can be manufactured through a filter press process. LSS contains large quantities of water, which renders it uneconomical for recycling [26].…”

Section: Introductionmentioning

confidence: 99%

Properties of Calcium Acetate Manufactured with Etching Waste Solution and Limestone Sludge as a Cementitious High-Early-Strength Admixture

Kim

Ryu

Shin

et al. 2016

Advances in Materials Science and Engineering

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Concrete is one of the most widely used construction materials. There are several methods available to improve its performance, with one of them being the use of high-early-strength admixtures (HESAs). Typical HESAs include calcium nitrate, calcium chloride, and calcium formate (CF). Industrial by-products, such as acetic acid and lime stone sludge (LSS), can be used together to produce calcium acetate (CA), which can subsequently be used as a cementitious HESA. In this study, calcium carbonate and LSS were mixed with cement in weight ratios of 1 : 1, 1 : 1.5, and 1 : 2, and the properties of the as-produced CA were evaluated. CA and CF were mixed with cement in different weight ratios (0, 1, 2, and 3 wt%) to obtain CA- and CF-mortars, respectively. The flow behavior, setting time, pH, and compressive strength of these mortars were evaluated, and their X-ray diffraction patterns were also analyzed. It was found that as the CF content in the CF-mortar increased, the initial strength of the mortar also increased. However, it impaired its long-term strength. On the other hand, when 1% CA was mixed with cement, satisfactory early and long-term strengths were achieved. Thus, CA, which is obtained from industrial by-products, can be an effective HESA.

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Section: Introductionmentioning

confidence: 99%

Properties of Calcium Acetate Manufactured with Etching Waste Solution and Limestone Sludge as a Cementitious High-Early-Strength Admixture

Kim

Ryu

Shin

et al. 2016

Advances in Materials Science and Engineering

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“…6) Therefore, studies were performed to apply lime sludge to flue gas desulfurization in order to reduce the amount of limestone used as a desulfurizing agent in thermal power plants. 7) Limestone sludge is designated waste with the water content of 15% generated during the manufacture of CaO used as a subsidiary material in steel mills and it contains 90% or more CaCO 3 . If a desulfurization test is conducted after mixing limestone slurry and limestone sludge used in conventional desulfurization processes at a predetermined ratio, the desulfurization effect equal to that of conventional desulfurizing agents can be obtained.…”

Section: Introductionmentioning

confidence: 99%

“…If a desulfurization test is conducted after mixing limestone slurry and limestone sludge used in conventional desulfurization processes at a predetermined ratio, the desulfurization effect equal to that of conventional desulfurizing agents can be obtained. 7) Thus, this study aimed to fabricate FGD gypsum by the field application of limestone sludge during the flue gas desulfurization process of a thermal power plant, and examine the changes in the performance of cement and cement mortar after applying the fabricated FGD gypsum to cement and cement mortar. Generally, gypsum is used to control the setting time of cement in a cement production process, and cement is produced by mixing it with cement clinker and then grinding the mixture.…”

Section: Introductionmentioning

confidence: 99%

The Influence of FGD Gypsum Fabricated from Limestone Sludge on Cement Properties

Seo¹,

Chu²,

Shim³

et al. 2016

J. Korean Ceram. Soc

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For the purpose of reducing the amount of limestone, which is used as a desulfurization agent to absorbing SO X gas in thermal power plants, and to recycle limestone sludge generated from a steel mill, limestone sludge was utilized as a desulfurization agent. In this study, cement, made of flue gas desulfurization (FGD) gypsum obtained in a desulfurization process using limestone sludge, was manufactured then, experiments were conducted to identify the physical properties of the paste and mortar using the cement. The results of the crystal phase and microstructure analyses showed that the hydration product of the manufactured cement was similar to that of ordinary Portland cement. No significant decline of workability or compressive strength was observed for any of the specimens. From the results of the experiment, it was determined that FGD gypsum manufactured from limestone sludge did not influence the physical properties of the cement also, quality change did not occur with the use of limestone sludge in the flue gas desulfurization process.

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“…2) The limestone sludge refers to a designated waste of about 15% in moisture content level which is produced upon manufacturing of quicklime used as a subsidiary material in the iron making process, and the desulfurizing effects may be obtained on an equivalent level to that for the existing limestone slurry when removal tests for SO 2 are conducted after mixing of the limestone slurry used in the existing desulfurizing process with the limestone sludge by a given ratio. 2) Meanwhile, efficiencies and operation costs of FGD process to remove SO 2 are affected by several factors. Particularly, the removal efficiency of SO 2 gas is determined by pH, temperature, solid content, etc.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Desulfurization Efficiency of Limestone Sludge with Various Admixtures

Seo¹,

Chu²,

Shim³

et al. 2015

Journal of the Korean Ceramic Society

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The flue gas desulfurization (FGD) process is one of the most effective methods to reduce the amount of SO 2 gas (up to 90%) generated by the use of fossil fuel. Limestone is usually used as a desulfurizing agent in the wet-type FGD process; however, the limestone reserves of domestic mines have become exhausted. In this study, limestone sludge produced from the steel works process is used as a desulfurizing agent. Seven different types of additives are also used to improve the efficiency of the desulfurization process. As a result, alkaline additive is identified as the least effective additive, while certain types of organic acids show higher efficiency. It is also observed that the amount of FGD gypsum, which is a by-product of the FGD process, increases with the used of some of those additives.

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A Study on the Application Limestone Sludge to the Flue Gas Desulfurization Process

Cited by 4 publications

References 3 publications

Properties of Calcium Acetate Manufactured with Etching Waste Solution and Limestone Sludge as a Cementitious High-Early-Strength Admixture

Properties of Calcium Acetate Manufactured with Etching Waste Solution and Limestone Sludge as a Cementitious High-Early-Strength Admixture

The Influence of FGD Gypsum Fabricated from Limestone Sludge on Cement Properties

A Study on the Desulfurization Efficiency of Limestone Sludge with Various Admixtures

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