Raw materials Flashcards

1
Q

What raw materials are used in soda lime glass?

A

~ sand (SiO2), limestone (CaCO3), and soda ash (Na2CO3)

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2
Q

What’s the rxn for the solvay process?

A

~ 2NaCl + CaCO3 –> Na2CO3 + CaCl2

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3
Q

What is a substitution for limestone?

A

~ dolomite (Ca, Mg)CO3

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4
Q

What is a substitution for soda ash?

A

~ feldspar (granite, quartz, mica)

~ feldspar is liberated by crushing and separating by froth floatation (quartz is also generated and used as source of silica)

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5
Q

What is borax used for?

A

~ source of soda and boria

~ in e-glass, which intolerant of alkali, boric acid (borax + HCl) is used

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6
Q

What is iron in terms of raw materials?

A

~ BA, makes glass green

~ optical glasses can’t have more than 0.015% Fe2O3 impurity

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7
Q

How can iron introduced from crushing and grinding machinery be removed?

A

~ magnets

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8
Q

How can iron present in the original rock be removed?

A

~ with hot concentrated sulfuric acid (expensive)

~ used only when lots of freedom from iron oxide is required

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