Optimal Conditions and Significant Factors of Soda Lime Glass Foam From Industrial Waste Using AlN

Transcription

1 Optimal Conditions and Significant Factors of Soda Lime Glass Foam From Industrial Waste Using AlN Emad M. M. Ewais1, Ahmed A. M. El-Amir1, Ahmed M. H. ElShenawy1, G. Feckler2, O. Smirnova2, R. Capuano2, Thomas Fend2 Refractory & Ceramic Materials Division(RCMD), Central Metallurgical R&D Institute CMRDI, P.O. Box 87 Helwan, Cairo, Egypt 1 2 German Aerospace Center Linder Höhe, Köln, Germany dr_ewais@hotmail.com INTERNATIONAL CONFERENCE ON REFRACTORY AND METALLURGY(ICRM) MOSCOW, RUSSIA RCMD APRIL 7-8, 2016

2 OUTLINE S Introduction Target Methodology Results Conclusion RCMD

3 GLASS PRODUCTION OVERVIEW Refractory & Ceramic Materials Divi.

4 Glass Glass is an amorphous solid, revealing an ionic character, with properties resembling a very viscous liquid. Its non-metallic network structure is based on silica (SiO2), that is bonded together with metal oxides that act as "network modifiers". It is a hard, usually brittle and transparent substance, composed chiefly of silicates and an alkali metal fused at high temperatures. Metallic oxides impart colour. It is resistant to attack by most chemicals (except for hydrofluoric acid). The inert properties make it ideal for the storage and transport of most food and liquids. RCMD

5 Main Glass Types Based Physiochemical Composition 95% E. R. Vieitez, P. Eder, A. Villanueva, H. Saveyn, End-of-Waste Criteria for Glass Cullet: Technical Proposals, JRC(Joint Research Center) Scientific and Technical Reports, Sevilla, Spain EUR 25220, EN RCMD

6 Soda-Lime Glass Glass industry mainly produces soda-lime glass. It is composed of: Composition 71-75% silicon dioxide (SiO2 derived mainly from sand) 12-16% sodium oxide (Na2O derived from soda ash Na2CO3) 10-15% calcium oxide (lime, CaO, derived from limestone CaCO 3) Low levels of other components Sodium carbonate (Na2CO3, soda ) is added to lower the melting point of silica to about 1500 C. Additives used to improve the chemical durability of the glass, Calcium oxide (CaO, lime ), magnesium oxide (MgO) and aluminium oxide (Al2O3) are added. Major applications of Soda-lime glass Container glass (packaging bottles, jars), Flat glass (windows of buildings, automotives) and Domestic glass (drinkware, dishes) RCMD

7 s Production Line_Schematic Diagram Refractory & Ceramic Materials Division

8 orld Glass Production n 2007, 138 million tons

9 Classifications Based on the Six Broad Sectors of the Glass Manufacturing Industry (1)Container glass or packaging glass (~56%): Bottles and Other containers (for packaging of food, drinks, pharmaceuticals, cosmetics, etc.). (2) Flat glass (Mainly windows in buildings and vehicles) (~25%): The flat glass products can be roughly categorized into two types: Float glass It is used for a huge number of applications including glazing for building and transportation, industrial applications, electronics, furniture, appliances, etc. Rolled glass It is used principally in the manufacture of glass doors, partitions, shower enclosures, and photovoltaic panels.

10 Classifications Based on the Six Broad Sectors of the Glass Manufacturing Industry Cont. (3) Continuous filament glass fibres (~2%): Supplied in a variety of forms such as mat, chopped strand, roving, yarn, tissue or milled fibre. The main end use (approximately 75%) is the reinforcement for many polymer materials. The main markets for the resulting composite materials are the building industry, the automotive and transport sectors, and the electrical and electronics industry. Continuous-filament glass fibres are predominantly made of E glass. (4) Domestic glass, also called tableware (~4%): Used for tableware, glassware, decorative glass, etc. Most important components are soda-lime, lead crystal, crystal glass, and opaque and glass ceramics. (5) Insulation mineral wool (~10%): Insulation mineral wool is made of short fibres of glass (typically borosilicate glass or alkaline earth alumina- silicate stonewool) and ceramic materials. R&D Institute It iscentral usedmetallurgical for insulation, filtering and firestop applications. (6) Special glass (<3%)

11 Sectors of Glass Industry, Domestics glass Applications, Types 4% E. R. Vieitez, P. Eder, A. Villanueva, H. Saveyn, End-of-Waste Criteria for Glass Cullet: Technical Proposals, JRC(Joint Research Center) Scientific and Technical Reports, Sevilla, Spain EUR 25220, EN

12 GLASS WASTE OVERVIEW Refractory & Ceramic Materials Division

13 Statics on EU-27 Glass Production, &Waste Generation, Collection, and Recycling (2007) Glass

14 Classification of WASTE Glass According to European Waste Catalogue

15 Mass Balance of Glass Production, & Waste Glass Collection Recycling, Traded, & Disposed of (2007) B/A=86.9 % E. R. Vieitez, P. Eder, A. Villanueva, H. Saveyn, End-of-Waste Criteria for Glass Cullet: Technical Proposals, JRC(Joint Research Center) Scientific and Technical Reports, Sevilla, Spain EUR 25220, EN

16 Glass Waste Composition Compoun Composition, d Wt.% Na2O MgO Al2O3 SiO2 P2O5 SO3 K2 O CaO TiO2 Fe2O3 ZnO SrO ZrO

17 Processi ng Soda Lime Glass Waste + AlN Glass Foam (1) MIXING (2) FORMING ( oC) (3) FIRING RCMD

18 termination of Porosity Determination of mass, diameter and length Estimating the bulk density of dense glass to dg=3.2 g/cm³ Determination of absolute density of porous glass pg=mass/volume Determination of relative density RD= pg/ dg Determination of porosity by =(1RD)

19 Determinations of Mean Pore Diameter/Cell Density Cell density determined by counting pores along two arbitrary distances l1 and l2 Mean pore size z computed by z=(n1/l1 +n2/l2)/2 PPI-number by NPPI=25.4/z sample #3

20 Thermophysical Properties: Methodology Transient Plane Source Technique (Hot Disk) Sample volume partially heated by Nickel double spiral Measured volumes up to mm Two identical samples for each measurement necessary Single sided technique by averaging

21 Thermophysical Properties: Methodology cont. Temperature increase between samples measured Evaluation by Numerical Procedure Results as Thermal conductivity (W/mK) Thermal Diffusivity (mm²/s) Specific Heat Capacity (MJ/m³K)

22 Permeability: Methodology Air flow through sample generated with blower and pipe system Precise measurement of temperature mass flow and pressure drop over sample

23 Permeability: Methodology cont. Sample mounted and connected with steel pipe by taping Superficial fluid velocity calculated from volume flow and air density Pressure drop over sample measured for various mass-flow rates

24 Permeability: Methodology cont. Specific pressure drop (pressure difference/sample length) versus superficial velocity plots generated Extended Darcy equation fits computed dp Dyn 2 v v dx K1 K2 Permeability coefficients K1 and K2 computed from viscosity and density of air

25 SS FOAM BASED SODA LIME GLASS & AlN_Photos 5 wt.%aln@950oc 7.5 wt.%aln@850oc.5 wt.%aln@8505ocwt.%aln@850oc 2.5 wt.%aln@950o 5 wt.%aln@900oc 7.5 wt.%aln@900oc 2.5 wt.%aln@900oc 2AlN (s) 2Al (s) +N2(g) 7.5 wt.%aln@950 RCMD

26 nerated Glass Foam_XRD Amorphous structure RCMD

27 SS FOAM BASED SODA LIME GLASS_BSE _2.5 wt.% AlN 2.5 PS Increases With T 2.5 wt.%aln@900oc 2.5 wt.%aln@950oc PS Increases with T

28 ASS FOAM BASED SODA LIME GLASS_BSE _5 wt.% AlN 5 wt.%aln@850oc PS Increases With T 5 wt.%aln@900oc PS Increases with T 5 wt.%aln@950oc

29 SS FOAM BASED SODA LIME GLASS_BSE _7.5 wt.% AlN 7.5 PS Increases With T 7.5 wt.%aln@900oc 7.5 wt.%aln@950oc PS Increases with T

30 SS FOAM BASED SODA LIME GLASS_BSE PS Increases With AlN content 5 wt.%aln@950oc 7.5 wt.%aln@850oc.5 wt.%aln@850oc5 wt.%aln@850oc PS Increases With AlN content 2.5 wt.%aln@950o 2.5 wt.%aln@900oc5 wt.%aln@900oc7.5 wt.%aln@900oc 7.5 wt.%aln@950o

31 SS FOAM BASED SODA LIME GLASS_BSE 5 wt.%aln@9000oc PS Increases With AlN content

32 SS FOAM BASED SODA LIME GLASS_CCS RCMD

33 Geometrical Properties o 60C Cellularity (ppi) 2.5% 5.0% 7.5% 2.5% 5.0% 7.5% 5.0% 7.5% Mean pore diameter mm ,920,930,930,940,940,95 Cellularity exact PPI Cellularity app. PPI density kg/m³ porosity Porosities between 92 and 94% Cell densities from 12 to 46 PPI Rel. porosity decreases with cellularity Relative porosity RCMD

34 Thermophysical and Permeability Data Th. cond. Th. diff. W/mK mm²/s 2.5% % % % % % % % C Central ometallurgical R&D Institute Spec. heat MJ/m³K Perm. K1 Perm. K1 m² *10e12 m² K2 m E E E E E E E E E E E E E-06 Refractory & Ceramic Materials Div.

35 T h e rm a l c o n d u c tiv ity (W Structure-Property Relations P e rm e a b ility (* 1 0 e 1 2 m ²) Very low effective thermal conductivity (TC) values (< 0.1 W/mK) due to high porosity and predominantly closed porosity TC decreases with porosity 0,110 0,105 0,100 0,095 0,090 0,92 0,93 0,93 0,94 0,94 0,95 Relative porosity 1,400 1,200 1,000 0,800 Permeability increases with porosity 0,600 0,400 0,200 0,000 0,92 0,93 0,93 0,94 0,94 0,95 Relative porosity RCMD

36 D ensity,kg/m ³ Conclusions: Density kg/m Compositions Refractory & Ceramic Materials Division

37 THANK YOU FOR YOUR ATTENTION Refractory & Ceramic Materials Division