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WorksheetsMetallurgical Silicon Exam
Total questions: 44
Worksheet time: 21mins
Name
Class
Date
1.
What is the primary raw material for metallurgical silicon production?
a)
Quartzite
b)
Limestone
c)
Granite
d)
Bauxite
2.
What minimum SiO₂ purity is required in quartzite for MG-Si production?
a)
>99%
b)
>95%
c)
>90%
d)
>85%
3.
Which location produces the world's highest purity quartzite?
a)
Spruce Pine NC USA
b)
Minas Gerais Brazil
c)
Western Australia
d)
Norway
4.
What temperature range is used in the blast furnace for silicon production?
a)
1800-2000°C
b)
1200-1400°C
c)
2500-3000°C
d)
800-1000°C
5.
What is the main chemical equation for silicon reduction?
a)
SiO₂ + 2C → Si + 2CO
b)
SiO₂ + C → Si + CO₂
c)
Si + O₂ → SiO₂
d)
SiO₂ + 4H₂ → Si + 2H₂O
6.
What is the typical purity of MG-Si after smelting?
a)
98-99%
b)
85-90%
c)
99.9999%
d)
75-80%
7.
Which country produces 70% of the world's metallurgical silicon?
a)
China
b)
USA
c)
Brazil
d)
Norway
8.
What is the world's approximate annual MG-Si production?
a)
6-7 million tons
b)
1-2 million tons
c)
15-20 million tons
d)
500k tons
9.
What percentage of MG-Si goes to aluminum alloy production?
a)
55%
b)
25%
c)
80%
d)
10%
10.
How much CO₂ is emitted per ton of silicon produced?
a)
5-6 tons
b)
1-2 tons
c)
10-15 tons
d)
0.5 tons
11.
How much energy (MWh) is required per ton of MG-Si?
a)
11-13 MWh
b)
2-3 MWh
c)
25-30 MWh
d)
50-60 MWh
12.
What process purifies MG-Si to semiconductor-grade?
a)
Siemens process
b)
Haber process
c)
Bessemer process
d)
Hall-Héroult process
13.
What purity level is required for semiconductor silicon?
a)
99.9999999% (9N)
b)
98-99%
c)
99.9%
d)
99.99%
14.
Boron and Phosphorus are critical impurities for semiconductors
a)
TRUE
b)
FALSE
15.
MG-Si can be used directly for semiconductors without purification
a)
FALSE
b)
TRUE
16.
China produces approximately 70% of global MG-Si
a)
TRUE
b)
FALSE
17.
Slag byproduct from silicon production cannot be reused
a)
FALSE
b)
TRUE
18.
MG-Si production is cleaner than steel production
a)
TRUE
b)
FALSE
19.
The blast furnace temperature for silicon is around 1900°C
a)
TRUE
b)
FALSE
20.
Quartzite must be >99% pure SiO₂ for MG-Si production
a)
TRUE
b)
FALSE
21.
What intermediate product is made from MG-Si before silicones?
a)
Silanes
b)
Methane
c)
Ethylene
d)
Propane
22.
What are the top two uses of MG-Si?
a)
Aluminum alloys & Silicones
b)
Steel & Cement
c)
Plastics & Rubber
d)
Glass & Ceramics
23.
Which impurities form slag during smelting?
a)
Fe Al Ca
b)
B P C
c)
H N O
d)
Na K Cl
24.
Name a major MG-Si manufacturer
a)
Elkem
b)
Tesla
c)
BASF
d)
DuPont
25.
How much slag is produced per ton of silicon?
a)
1-2 tons
b)
5-10 tons
c)
0.1 tons
d)
20 tons
26.
What carbon sources are used in the blast furnace?
a)
Charcoal & Coal
b)
Water & Air
c)
Sand & Salt
d)
Oil & Gas
27.
Why is silicon added to aluminum alloys?
a)
Improves castability
b)
Makes it magnetic
c)
Increases weight
d)
Reduces cost only
28.
What happens after the Siemens process to make single crystals?
a)
Czochralski process
b)
Electrolysis
c)
Distillation
d)
Filtration
29.
If China produces 5M tons at 70% share what is global total?
a)
7.1 million tons
b)
3.5 million tons
c)
10 million tons
d)
15 million tons
30.
What is MG-Si purity vs semiconductor purity?
a)
MG: 98-99% vs Semi: 99.9999999%
b)
MG: 95% vs Semi: 99%
c)
MG: 85% vs Semi: 95%
d)
Both are 99%
31.
Environmental controls needed for dust emissions?
a)
Electrostatic precipitators
b)
Open burning
c)
Venting to atmosphere
d)
No controls needed
32.
Why did production shift to China?
a)
Cheap electricity & Low labor
b)
Better technology only
c)
More quartzite only
d)
Closer to customers only
33.
Approximately what % of MG-Si is used for polysilicon?
a)
10%
b)
50%
c)
2%
d)
75%
34.
Which are hardest impurities to remove from silicon?
a)
Boron & Phosphorus
b)
Iron & Calcium
c)
Carbon & Oxygen
d)
Nitrogen & Hydrogen
35.
Why is Spruce Pine quartzite valuable?
a)
Highest purity & Low B/P
b)
Cheapest price
c)
Largest deposits
d)
Easiest mining
36.
Oxygen is removed during reduction as what?
a)
CO/CO₂ gas
b)
Water vapor
c)
Pure oxygen
d)
Hydrogen gas
37.
Name an application of silicones
a)
Construction sealants
b)
Fuel
c)
Food additive
d)
Paint thinner
38.
Current price range of MG-Si (2025)?
a)
1300-2800 USD/ton
b)
100-200 USD/ton
c)
10000-15000 USD/ton
d)
50-100 USD/ton
39.
What byproducts are generated per ton of silicon?
a)
Slag & CO/CO₂
b)
Only water
c)
Only heat
d)
Pure oxygen
40.
Silicon is the second most abundant element in Earth's crust
a)
TRUE
b)
FALSE
41.
CMOS technology uses silicon as the semiconductor material
a)
TRUE
b)
FALSE
42.
Solar cells require lower purity silicon than semiconductors
a)
TRUE
b)
FALSE
43.
The Siemens process produces polysilicon from MG-Si
a)
TRUE
b)
FALSE
44.
All transistors in modern CPUs act as switches
a)
TRUE
b)
FALSE
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