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REUSE OF LIME SLUDGES short2

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Information about REUSE OF LIME SLUDGES short2
Education

Published on February 13, 2008

Author: Dorotea

Source: authorstream.com

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REUSE OF WATER SOFTENING LIME SLUDGES:  REUSE OF WATER SOFTENING LIME SLUDGES USE IN ROAD CONSTRUCTION CEMENT KILNS & POWER PLANTS by J(Hans) van Leeuwen and David White, CCE Iowa State University Slide2:  Problems with hard water Slide4:  Typical water treatment process with lime softening Lime sludge Ca(OH)2 Lime    Slide5:  SETTLING Slide7:   FILTER PRESS DEWATERING & STOCKPILING  Slide8:   SOLAR DRYING & STORAGE  Slide9:  KILN DRYING  & STORAGE  200,000 tons/y in IA; millions in the US Potential Use of Lime Sludge in Cement Production:  Potential Use of Lime Sludge in Cement Production Slide11:  CEMENT PLANT Slide12:  ADDING TO CEMENT RAW MATERIALS Slide13:  80t cement produced using 20t lime sludge Slide14:  Construction industry Cement production Limestone is one of the major raw materials in cement production Millions of tons produced/y in Iowa Slide15:  POTENTIAL USE OF LIME SLUDGE IN COAL FIRED POWER PLANTS Slide16:  SO2 + CaCO3  CaSO3 + CO2 AIR POLLUTION CONTROL WITH LIMESTONE Slide17:  SLUDGE DRYING & LOADING Slide18:  ISU Power Plant Slide19:  THERMOGRAVIMETRIC ANALYSIS OF LIME SLUDGE Slide20:  DETAIL OF TGA Slide21:  CONTROL OF POWER PLANT AND EMISSIONS RESULTS: ENCOURAGING Slide22:  Could lime sludge be used for dust control as a soil modifier as a soil substitute in large filling applications? Potential Use of Lime Sludge in Road Construction Lime sludge use as structural material:  Lime sludge use as structural material  Lime sludge + 17.5% fly ash + 17.5% bottom ash  Lime sludge + 17.5% fly ash + 17.5% concrete sand 7d 28d 56d Curing time, days psi More tests needed with different proportions  Lime sludge + 17.5% fly ash Unconfined Bearing Strength Slide24:  Western Iowa Loess Lime sludge Densities of fill materials Dry Density (kg/m3) Water content (% based on dry mass) More work needed on transportation costs

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