Presentation on theme: "Biosilica from Biomass Construction Material and Energy ChK Group, Inc"— Presentation transcript:
1Biosilica from Biomass Construction Material and Energy ChK Group, Inc Biosilica from Biomass Construction Material and Energy ChK Group, Inc. Plano, Texas ACS National Meeting & Exposition Dallas, TX March 20, 2014Rajan K. Vempati, Ph.D.Prasad Rangaraju, Ph.D.Antonio Nanni Ph.D.Sridhar Komernini, Ph.D.John ImhoffSubbaraman Viswanathan, Ph.D.
2Project GoalsManufacture Amorphous silica from biomass (Biosilica) with multiple usesConstruction material in High Strength ConcreteAdditive in paints, plastics & tiresZeolite manufactureSustainable ProductUnlike Other Food Products used in Bio-Fuels. The Rice Production for Human Consumption Unaffected.Generate RevenuesFrom Biosilica - a high value productSell energy as steam and powerCreate Jobs
3Biosilica Renewable Cementitious Material Rice Hull Rice Field (Upland Cultivation)Rice HullFrom Rice Mills
4Supply of Rice Hulls Annual Capacities Area Rice Mill Capacity Supply Agricultural Waste Generated from Rice MillsUsed as fuel for its caloric value.Ash (black ash) with high carbon content is rejected as waste.Off-white or white Biolica Supply Potential is highMajor competition – from silica fumes in CementAreaRice MillCapacity SupplyBiosilicaCompetitionFromSilica Fumes (*)USA10.5 Million Tons0.4 Million Tons60,000 TonsWorldwide550 Million Tons20 Million Tons--Annual Capacities(*) Silica fumes is a byproduct with limited capacitySilica fumes (Spellings)4
5Biosilica Premium Additive in High Performance Concrete (HPC) Value Chain for Biosilica Rice Cultivation and Processing in Rice MillsChK ProcessBiosilica Production and Power GenerationBiosilica toHPC and Power to the GridCurrently Rice Hull is sent to landfills at a costBlack ash is not suited for HPC due to high carbon contentChK Process unique features:Biosilica Carbon content < 0.1%; NO graphitic carbonZero crystallinityProduces process heat and power based on site requirementsNo solid waste as inorganic matter in rice hull becomes BiosilicaSimple process easy to operate and controlZero CARBON emissions and future carbon CREDITS
8Biosilica Properties Silica content: > 90 W% Type: Amorphous silica Carbon Wt%: < 0.1 W%Cristobalite: No crystalline matter(verified in XRD and FTIR)Major Uses:Pozzolan additive to concrete; replaces 10 to 20% of cementProduces ZSM-5 zeolite by thermochemical methods WITHOUT an organic templateFiller in paints, plastics and tires
9Biosilica High Performance Cement and In Architectural Cement Unground Ground .
10High Performance Concrete (HPC) Use to Mitigate Severe Erosion in Dams Kinzua Dam in PennsylvaniaHPC used to mitigate severe erosion due to abrasion with water flowDOING WELL AFTER HPC INSTALLATION IN 1983
11Addition of Biosilica in HPC Results in Slower Curing and Higher Strengths (Increase by 35%) Figure – Rate of Development of Compressive Strength in GBiosilica ConcreteFigure – Comparison of the 28-Day Compressive Strength of UBiosilica and GBiosilica Concrete
12Bridge in Florida in US – 1 Highway Bridges in Florida Corrosion concerns – State Government Specifies Addition of 8 to 9% Silica Fume in Concrete that Stands in Salt Water or Gets SplashedBridge in Florida in US – 1 HighwayOther applications for Biosilica in HPCParking lots in cold climates – subjected to severe chloride corrosion from salted roadwaysHigh rise buildings that require HPC with high modulus of elasticity
13Biosilica Substantially Reduces Chloride Permeability Figure – Comparison of Chloride Permeability Values of Biosilica Concretes after 56-Day Curing
14Durability Issues Corrosion – Most Prominent Problem 4/13/2017Durability IssuesCorrosion – Most Prominent ProblemAlkali-Silica Reactivity (ASR)Delayed Ettringite Formation (DEF)Sulfate AttackFreeze-Thaw DamagePrasad
16Biosilica Use in ZSM-5 Production ChK Process - patentedChK has developed a process to minimize heating requirements without using any organic templateSynthesis conditionsSi/Al molar ratio of reaction mixture: 20 to 100Temperature 190°C (could use 200 LB steam for heat up)Crystallization time 36 hoursSeeding with up to 1% ZSM 5Product is filtered washed and dried at 120°C.For special applications, ZSM-5 could be calcined, as neededProduct ZSM-5 propertiesSi/Al Molar ratios of 80 and above are easily obtained.Carbon content of Rice Hull ash affects the type and quality of ZSM-5