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Solar Energy Renewable, Abundant, clean and readily available . Recovery of Glycol oil from Silicon Waste. Yu-Pei Shih Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan. What is silicon waste??. - PowerPoint PPT Presentation
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0 5 10 15 20 250.0
0.5
1.0
1.5
2.0
2.5
solid
/gL
-1
Time/ hr
Origin solid content=85g/L
DI-water Alcohol Acetone
0 5 10 15 20 250
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Origin solid content=150 g/L
so
lid/g
L-1
Time/ hr
25OC 40OC
Origin Acetone Alcohol Water Oil
<1000NTU
<1000 NTU
762NTU
7.2NTU
0.5 NTU
Solar EnergyRenewable,Abundant,
clean and readily available Yu-Pei Shih
Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan.
Advantages of liquid-liquid phase separation: Without the equipments for vacuum or the formation of steam Prevented pyrolysis Fast & simple equipment Recycled the water Removed the small size particles
In silicon wafer manufacturing, silicon ingots must be cut by multiple wiresaws with an abrasive slurry composed of SiC particles in a glycol oil. This silicon waste drains away with the slurry. In the world at least 3000 ktons of silicon waste is generated and this glycol oil drains away with the slurry. However, the glycol oil in sawing waste can be as high as 45% by weight. Therefore, a sufficient recovering glycol oil from silicon waste could yield enough glycol oil to support silicon solar cell production and reduced pollution.
2. The solid-liquid separation
Part 1- Centrifugation separation(3000 g / 5500 rpm / 25 &40 )℃ ℃
Part 2- Centrifugation separation with 50 wt% dilutes.(3000 g / 5500 rpm / 25 )℃
3. Liquid-Liquid separation
Recovered glycol oil may be reuse to silicon cutting process.
1. What is silicon waste??
0.1 1 10 100
0
2
4
6
8
10
particle size (m)
volu
me/
%
Difficulty: Particles suspended stability High viscosity of waste With a lot of small size particles
4. The properties of glycol oil
Part 1- Appearance
How can I do to recovery the
glycol oil from silicon waste?!
Part 2- Newtonian fluid
origin
recovery
Part 4- GC Analysis
Part 3- Suspension
Origin 25℃ 40℃ Oil
<1000NTU
<1000NTU
7.2NTU
0.5 NTU
Controlled by: Viscosity & hindered effect Removal small size particles
For origin oil Suspension solids =0 g/L Turbidity= 0.5 NTU
For origin oil Suspension solids =0 g/L Turbidity= 0.5 NTU
-20 0 20 40 60 80 100 120 140 160
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temperature/ 0C
wat
er/ w
t.%
Time/ min
Simple distillation water content oil phase temperature
liquid-liquid separation water content oil phase temperature
Compared ability of removal water by simple distillation & phase separation:
Electrochemistry Process Waste Reduction LabCentrifugation with
50 wt% water. (3000 g / 6 hr/ 25 )℃
oil & water mixing
=particles
oil & water separation
Rich water phase
Rich oil phase
hydrogen bonds
0 2 4 6 8 10 12 140
1
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origin recovery
shea
r stre
ss(N
m-2
)
shear rate(s-1)
OriginRecycling
Recovery of Glycol oil from Silicon Waste