PSE 104
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Homework 9
Due 5/27/05
Concrete produced using lignosulfonates have which of following properties?
a)
Increased density
b)
Better uniformity
c)
Higher compressive strength
d)
Better durability
e)
All of the above
When was the first recorded use of lignosulfonates in concrete?
a)
1874
b)
1923
c)
1948
d)
1956
e)
1992
True or False. The addition of lignosulfonates to oil well drilling muds increases the
loss of water from the mud system.
a)
True
b)
False
Lignosulfonates are used in many applications because they are not phytotoxic.
What does phytotoxic mean?
a)
Harmful to fish
b)
Harmful to plants
c)
Make humans sick
d)
Harmful to microorganisms
How are lignosulfonates used in liquid micronutrient applications?
a)
They help to reduce the dustiness of the product
b)
They keep the trace minerals soluble under pH conditions that would normally
cause them to become insoluble.
c)
The chemical makeup of the sulfonated lignin polymer allows it to serve as a
plant nutrient.
d)
They keep plants from absorbing harmful levels of trace metals.
Lignosulfonates are applied as dust control agents on dirt roads at what application
rate (as a 25% solution)?
a)
5 gallons/sq yard
b)
10 gallons/sq yard
c)
1 gallon/sq yard
d)
1/2 gallon/sq yard
True or False: Lignosulfonates do not harm vegetation along side roads when
applied as road dust control agents.
a)
True
b)
False
Borregaard LignoTech produces a wide range of lignosulfonate products for use in a
large number of areas. Lignosulfonates for water treatment are used for which of the
following reasons?
a)
Elimination of hazardous microorganisms.
b)
Reduction in cooling tower foaming.
c)
Prevention of scale deposits in boilers and cooling towers.
d)
Odor reduction in water outfalls.
PSE 104
Homework 9
Due 5/27/05
One of Borregaard’s lignosulfonate products is SoyPass®. What is the function of
this product?
a)
Slows the breakdown of protein in a cow’s rumen so more is available for
uptake in the intestine.
b)
Lignosulfonates are used as a binder in the processing of soy bean meal for the
production of high protein animal feed.
c)
Precipitates soy protein at processing facilities allowing it to be recovered for
sale as animal feed.
10. What are lignosulfonates used for in brick manufacture?
a)
Improves the green (wet) strength of the brick
b)
Improves the dry strength of the brick.
c)
The lubricity of lignosulfonates reduces the energy required for brick
manufacture.
d)
Lignosulfonates are used to reduce the dustiness of dirt roads at the mining
operations used in brick manufacture.
e)
All of the above.
9.