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Applications of
lime products are widespread and diverse, they purify the water we drink,
they help to clean the air we breathe and shape the environment that we
live in.
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Hydrated lime, quicklime or dolomite
lime is mixed with water to give an alkaline slurry which neutralises the
low pH of acids.
Milk of lime can also be used to avoid the need for slurrying equipment.
Often insoluble calcium salt is precipitated during the reaction, this can
help to remove impurities from the system.
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Quicklime is mixed with cement, sand or
PFA, water and aluminium powder to give a slurry which rises and sets to
form honeycomb structured blocks which have excellent thermal and sound
insulation properties.
The heat generated when quicklime reacts with water the alkaline
conditions combined with aluminium powder generate hydrogen bubbles which
cause the blocks to rise. The heat generated subsequently causes the
slurry to set. The blocks are then heated in an autoclave, which promotes
reactions between calcium and silicates in the sand or PFA and gives extra
strength.Dolomite lime and/or modified quikclime can be added to reduce
excessive shrinkage or cracking.
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Calcium Carbonate, quicklime and
hydrated lime can be used to adjust the pH of soils to give optimum
growing conditions and hence improve crop yields. The use of quicklime,
hydrated lime and / or blends of these with Calcium Carbonate will help to
speed pH adjustment which can help to treat conditions
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Quicklime is used as a flux in the
smelting of copper, lead, zinc and other metals from their ores.
The Quicklime reacts with silica, alumina and other impurities to form a
molten slag, which can be removed. Slaked lime is used during the
extraction of aluminium from bauxite.
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A wide number of organic and inorganic
sludges can be treated using quicklime or dolomite lime to increase solids
content. Biological sludge can be sanitised by the raise in temperature
and pH obtained by adding these materials. Biosolids treatment up
Advanced Treated is achievable with this method.
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Quicklime is mixed with cement, sand or
PFA, water and aluminium powder to give a slurry which rises and sets to
form honeycomb structured blocks which have excellent thermal and sound
insulation properties.
The heat generated when quicklime reacts with water causes the slurry to
set and the alkaline conditions combined with aluminium powder generate
hydrogen bubbles, which cause the blocks to rise. The blocks are
then heated in an autoclave, which promotes reactions between calcium and
silicates in the sand or PFA and gives extra strength.
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Calcium Silicate Bricks are made by
mixing quicklime or hydrated lime with silica sand. The bricks are pressed
into shape and then heated in an autoclave, which promotes reactions
between calcium and silicates in the sand and gives extra strength.
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Calcium Silicate Bricks are made by
mixing quicklime or hydrated lime with silica sand. The bricks are pressed
into shape and then heated in an autoclave, which promotes reactions
between calcium and silicates in the sand and gives extra strength.
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One of the main applications of lime,
dolomite lime and their derivatives is as a raw material in the
manufacture of commonly used chemicals. The two main areas of usage of
lime is the production of inorganic chemicals or oil additives.
Inorganics
Lime or its derivatives are essential building blocks in the
manufacture of many inorganic salts such as Calcium Phosphate, a
toothpaste additive, Calcium Citrate a food and drink additive and Calcium
Nitrite an additive for sludge treatment.
Oil Additives
Hydrated lime is widely used in the production of oil additives for
lubricants specifically sulphonates, phenates and salicylates. The oil
additives are used as detergents and improve the life of engines in cars,
ships, etc...
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Contaminated land can be treated using
lime, dolomite lime and / or lime binder mixes to adjust pH and immobilise
sulphates, phosphates and heavy metals.
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Quicklime will react with any free
water present to form hydrated lime. This removes the water from the
system and can be useful when dealing with products that are heated during
the manufacturing process.
If water is not removed then there is a possibility of steam bubbles
forming in the finished product, which can adversely affect its strength
or appearance. This is often used in PVC and rubber manufacturing
processes.
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Flue gases and acid effluents
containing oxides of sulpher can be treated by introducing limestone,
chalk, quicklime or hydrated lime as a powder or slurry, promoting a
reaction to form insoluble calcium sulphate or gypsum which can then be
collected. If carried out under the correct conditions this process can
produce a saleable gypsum co-product.
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Hydrated lime and/or milk of lime is
used to remove temporary hardness from drinking water and to adjust its pH
for optimum purification conditions. precipitates out the heavy metals in
the form of insoluble hydroxides. Hydrated lime in the UK typically
conforms to the new standard BS EN 12518:Class 1 Type A.
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Many industrial processes utilise acids
or acidic species as part of the manufacturing process, Stringent
legislation has meant the acidic effluent has to be treated before it can
be discharged. The common method is to treat the effluent on site in a
treatment plant where lime plays a crucial part in the neutralisation of
the acidic species. Lime has the additional benefit of removing the toxic
heavy metals present as an insoluble salt which is removed by filtration.
Lime is relatively safe to use and handle compared to other alkalis. Being
a natural product, the product costs are low and does not suffer the large
fluctuations of selling prices as with other alkalis.
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Hydrated lime or quicklime can be used
to adjust pH of water systems to give an optimum environment. Quicklime
can also be used in pest control, such as starfish and parasites.
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In Flue Gas Treatment, hydrated lime is
sprayed into the flue gas stream in the form of a dry powder or a
suspension in water. This enables reaction with any pollutants (gases such
as hydrochloric or sulphuric acids or heavy metals) to form insoluble
salts. The spent sorbent is then removed in large filter units before
cleaned gases are emitted to the atmosphere. On larger sites, quicklime
can be slaked in situ to produce a hydrated lime suspension.
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Hydrated Lime is utilised in fruit
stores to aid the capture of Carbon Dioxide emitted from the ripening
fruit.This keeps the fruit fresh for longer periods.
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The continuing demand for power has
resulted in an increase in the burning of fossil fuels. Many such fuels
contain sulphur and the resultant emissions into the atmosphere are the
principal cause of acid rain. Other sources of acid rain can be
incinerators whether they burn municipal or industrial waste, clinical
waste, animal carcasses or natural fuels. Almost all incinerators around
the world have utilised lime as a means of removing harmful gases for many
years and proved lime to be cost effective, efficient and sustainable.
Lime is sprayed into the flue gas stream in the form of a dry powder or as
a suspension in water. It then reacts with the pollutants to form an
insoluble salt which is easy to dispose of. In the case of
desulphurisation it is possible to produce a quality gypsum (calcium
sulphate) which can be used as a raw material in plaster or plasterboard.
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Hydrated lime helps to de-hair and
"plump" hides before the tanning process is completed. Our
soluble bag technology helps to reduce the effort associated with dosing
lime into the washing drums.
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Hydrated lime gives extra plasticity to
Mortar, enabling it to flex more than normal sand and cement mortars. This
means less mortar cracking and makes bricks easier to recycle.
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Limewash is a traditional method of
painting walls which provides a colour base which allows the masonry to
breathe and sanitises the surface. Many Historic Buildings use
limewash wall colours.
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Lime Putty has been used in
construction for many centuries. It reduces the absorption of water into
masonry and allows the wall to breathe. It gives plasticity to the wet
mortar and helps it to penetrate into fine crevices, forming a strong even
bond and ensuring joints of sympathetic tensile and compressive strength.
Lime Putty gives extra elasticity to
the dry mortar, enabling it to flex more than normal sand and cement
mortars. This means less mortar crackings and makes bricks easier to
recycle. The best quality lime putty is made by slaking quicklime. This
method of building is widely used for Historic Building Conservation and
is becoming ever more popular in modern applications.
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Hydrated lime, quicklime or dolomite
lime is mixed with water to give an alkaline slurry which neutralises the
low pH of acids.
Milk of lime can also be used to avoid the need for slurrying equipment.
Often insoluble calcium salt is precipitated during the reaction, this can
help to remove impurities from the system.
[top]
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to main page
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By using the lime cycle, we can
increase the purity and consequently the brightness of a calcium carbonate
by calcining, hydrating and then re-carbonating back to calcium carbonate.
This process is used to make fillers and coating products which are used
within the paper industry.
The caustic properties of hydrated lime are utilised in the sulphate
process during the manufacture of paper and pulp.
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Quicklime will react with any free
water present to form hydrated lime. This removes the water from the
system and can be useful when dealing with products that are heated during
the manufacturing process. If water is not removed then there is a
possibility of steam bubbles forming in the finished product, which can
adversely affect its strength or appearance. This is often used in
PVC and rubber manufacturing processes.
[top]
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return
to main page
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By using the lime cycle, we can
increase the purity and consequently the brightness of a calcium carbonate
by calcining, hydrating and then re-carbonating back to calcium carbonate.
This process is used to make fillers and coating products which are used
within the paper industry.
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Information to follow
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Lime Putty has been used in
construction for many centuries. It reduces the absorption of water into
masonry and allows the wall to breathe. It gives plasticity to the wet
mortar and helps it to penetrate into fine crevices, forming a strong even
bond and ensuring joints of sympathetic tensile and compressive strength.
Lime Putty gives extra elasticity to
the dry mortar, enabling it to flex more than normal sand and cement
mortars. This means less mortar crackings and makes bricks easier to
recycle. The best quality lime putty is made by slaking quicklime. This
method of building is widely used for Historic Building Conservation and
is becoming ever more popular in modern applications.
[top]
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A wide number of organic and inorganic
sludges can be treated using quicklime or dolomite lime to increase solids
content. Biological sludge can be sanitised by the raise in temperature
and pH obtained by adding these materials. Biosolids treatment up
Advanced Treated is achievable with this method.
[top]
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Although widely known as Soil
Stabilisation, there are a number of distinct processes which can be
carried out by the addition of quicklime to waterlogged, clay bearing or
contaminated land. Improvement is the first process step, which is the
drying out of water bearing material by the heat generating reaction with
quicklime, this also converts some of the free water to hydrated lime. Using
this process, it is possible to convert an unworkable site into a solid
working platform within a short time.
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Dolomitic stone can be used as a
coolant and slag modifier in BOS steelmaking. Dolomitic lime can be added
to BOS and Electric Arc Steelmaking processes to modify slag viscosity,
protest refractories and to help flux the lime. It is also used to aid
with the removal of impurities.
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Sugar manufacturers use lime in order
to precipitate out impurities from beet and sugar cane extracts. Lime is
also used to neutralise the odours which are generated by beet washing and
transport.
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Hydrated lime and/or milk of lime is
used to remove temporary hardness from drinking water and to adjust its pH
for optimum purification conditions. precipitates out the heavy metals in
the form of insoluble hydroxides. Hydrated lime in the UK typically
conforms to the new standard BS EN 12518:Class 1 Type A.
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Hydrated lime suspensions or milk of
lime is used to neutralise and coat wire after it is acid cleaned.This
acts as a slip agent to reduce friction during the drawing process and
helps protect the wire during storage.
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