EMERGING TRENDS IN SEPARATION SCIENCE AND TECHNOLOGY - SESTEC 2016 Detailed study on the variation of particle size of precursor powder with pore size distribution of ceramic membranes Murchana Changmai1 and Mihir Kumar Purkait2 1 Dept.of Chemical Engineering, 2 Dept. of Chemical Engineering Indian Institute of Technology, Guwahati, Assam EMERGING TRENDS IN SEPARATION SCIENCE AND TECHNOLOGY - SESTEC 2016
Introduction What are we trying to answer … Porous ceramic membrane with wide applicability range Remarkable Physical properties Processing parameters Cleaning viability What are we trying to answer … The role of particle size on the pore size of low cost ceramic membrane.
What have WE done ? Reduce the initial particle size of the precursor powder Prepare membranes Study the physical and chemical changes Application
How did we do it? Grinding medium Ball mill MB 1 MB 2 MB 3 Mono mill Planetary mill MB 1 MB 2 MB 3 Precursor particle size reduction Add Pore forming agents Mechanical strength inducing agents Thorough mixing with Millipore water Casting in a metallic ring Drying the prepared membrane Sintering the membrane Grinding medium Ball mill Mono mill Planetary ball mill Particle size 102.4 µm 78.38 µm 1.09-2.40 µm MB-Membrane
Characterization Fourier transform infrared spectroscopy Individual graphs of the raw materials were obtained. Sintered samples had softer peaks in coamparison to non-sintered peaks.
Thermogravimetric analysis (TGA) With decreasing particle size the sintering temperature decreased. Effective grain coarsening.
X-Ray Diffractometer (XRD) analysis Major crystalline phases identified were quartz (Q), hematite (H) and mullite (M) and anhydrite (A) With reduced particle size, intensity of peaks started reducing
Field emission scanning electron microscopy (FESEM) analysis MB1 MB2 MB3 Field emission scanning electron microscopy (FESEM) analysis Grinding medium Ball mill Mono mill Planetary ball mill Pore diameter 20-21 µm 1-2.29 µm 227-450 nm Energy dispersive X-ray (EDX) analysis
Physical properties: % Apparent porosity: % Water absorption: % W.A = 𝑊 𝑊 − 𝑊 𝐴 𝑊 𝐴 ×100% Bulk density: B.D= 𝑀𝑎𝑠𝑠 𝑖𝑛 𝑎𝑖𝑟 (𝑔) 𝑉𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑤𝑎𝑡𝑒𝑟 𝑑𝑖𝑠𝑝𝑙𝑎𝑐𝑒𝑑 (𝑚𝑙) Where WA = Weight in air (g) WS = Soaked weight (g) WSW = Suspended weight (g) WA = Weight in air (g) WW=Wet weight (g) MB-Membrane
Particle size distribution of permeate With decreasing pore size ,the Particle size of filtrate decreased. Feed Permeate 1 Permeate 2 117.48 µm 10.36 µm 1.04 µm
Conclusion
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