What is ground calcium carbonate?
Ground calcium carbonate is a kind of white powder obtained by physical methods from calcite, limestone, dolomite,
chalk, shells, etc. Its appearance is gray-white or dark brown granular solid, slightly acidic, with high purity and
stable composition. It is a very important chemical raw material, widely used in industry, and is one of the
commonly used fillers.
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Raw material for ground calcium carbonate powder production
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Limestone
The calcium carbonate deposited in the lake and sea, after losing water, is compressed and cemented to form
a rock called limestone. Its Mohs hardness is less than 3, which is a medium hardness ore. In Egypt, Pakistan and other countries have a large
number of mineral deposits. Therefore, the production of heavy calcium carbonate in these two countries
mostly uses limestone as a raw material.
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Calcite
Calcite is also a calcium carbonate mineral, which is most commonly found in natural calcium carbonates.
Therefore, calcite is a widely distributed mineral. Calcite has a variety of crystal shapes. Their
aggregates can be clusters of crystals, or granular, massive, fibrous, stalactite, earthy, and so on.
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Marble
Its main component is calcium carbonate, accounting for more than 50%. It comes in many colors and usually
has a distinct pattern. The Mohs hardness is between 2.5 and 5. Because it has various colors and is very
beautiful after polishing, it is also often used as a decorative material in the construction industry.
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Chalk
Chalk is a fine deposit of calcium carbonate, a variant of calcite. Originally formed deep in the ocean
floor through the compression of tiny plankton that settled to the seafloor. The world-famous origins
include Essex County, New York, USA and Jiangxi Province, China.
What is ground calcium carbonate powder used for?
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Rubber industry
Adding heavy calcium carbonate to rubber can increase the volume of the product, which can save expensive
natural
rubber and greatly reduce production costs. Moreover, the tensile strength, tear strength and wear
resistance of the
treated rubber are better than those of pure rubber.
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Plastic industry
Excellent results can be obtained by using ground calcium carbonate as a filler. &#;Increase production and
reduce
costs. &#;Improve the heat resistance of plastic products. &#;Improve the color of the finished product.
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Paper industry
The paper industry is the largest application field of heavy calcium carbonate. It can replace wood pulp and
other
pigments, which can ensure the whiteness and strength of paper with low cost.
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Coating industry
Ground calcium carbonate has high whiteness and low oil absorption. It can reduce the amount of emulsion
required
and reduce the cost of latex paint. It can also improve the performance of the coating.
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Construction industry
Heavy calcium carbonate powder is the main ingredient in concrete for construction. This reduces production
costs
and increases the toughness and strength of concrete.
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Fireproof ceiling industry
Heavy calcium is also used in the production of fireproof ceilings. It can not only improve the whiteness
and
brightness of the product, but also increase the fire resistance of the product.
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Feed industry
Ground calcium carbonate can increase the calcium content in the feed, thereby improving the quality of the
feed.
What is difference between GCC and PCC?
The full name of GCC is Ground Calcium Carbonate. The full name of PCC is Precipitated Calcium Carbonate. Although
both belong to calcium carbonate, there are many differences. Next, a specific analysis will be carried out from
five aspects: production method, bulk density, whiteness, moisture content, and price.
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Production method
GCC is mainly powder obtained by grinding natural minerals such as calcite, marble, limestone, and chalk as
raw
materials by grinding equipment.
PCC is mainly powder obtained from limestone as raw material through calcination, digestion, carbonization,
dehydration, drying, classification and other processes.
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Bulk density
The difference in product bulk density is the most obvious difference between GCC and PCC. The bulk density
of
ground calcium carbonate products is relatively large, generally 0.8-1.3g/cm³; the bulk density of
precipitated
calcium carbonate products is relatively small, generally 0.5-0.7g/cm³. The bulk density of some nano
calcium
carbonate products can even reach about 0.28g/cm³.
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Whiteness
GCC has relatively more impurities, so the whiteness of the product is generally 89% to 93%, and a very
small number
of products can reach 95%.
PCC products have high purity, so the whiteness is generally 92% to 95%, and some products can reach 96% to
97%.
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Moisture content
The moisture content of ground calcium carbonate products is generally 0.2% to 0.3%. The moisture content is
relatively low and at the same time relatively stable. Ordinary precipitated calcium carbonate products have
a
moisture content of 0.3% to 0.8%, and sometimes fluctuate to a certain extent, which is not very stable.
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Price
The processing of heavy calcium carbonate is mainly achieved by physical methods of mechanical crushing and
grinding. The production of light calcium carbonate is obtained by chemical reaction precipitation.
The latter process is much more complicated than the former, and the requirements are correspondingly
stricter.
Therefore, GCC with the same particle size is about 30% cheaper than PCC. If performance allows, most buyers
will
choose to buy ground calcium carbonate. Therefore, the market prospect of ground calcium carbonate is very
broad.
How ground calcium carbonate is produced&#;
There are two main production methods of heavy calcium carbonate powder: dry method and wet method. Ground calcium
powder below mesh is generally dry ground. The production of ultra fine ground calcium carbonate over
mesh is mainly by wet grinding.
Dry grinding is a relatively common method at present, and the technology is relatively mature. Generally, a
processing system composed of crushing equipment, grinding equipment and classification equipment can be used to
obtain products of various particle sizes. The following figure is the specific process.
The wet grinding process is more complex and requires additional grinding aids. This makes it possible to obtain
particles with better dispersibility and finer particle size. Compared with the dry method, the production cost of
the wet method will also be higher. The general wet grinding process is shown below for you.
Precautions for storage of ground calcium carbonate powder
Calcium carbonate powder is one of those valuable minerals, the most important source of which is the earth's crust. This material makes up about 4% of the earth's crust and is found in all parts of the globe. This substance is not soluble in water.
Although the abundance of calcium carbonate is very high all over the world, but in memory of its many uses, many countries have turned to its artificial production in laboratory environments. This material is widely used in construction materials, paints, paper making and livestock and poultry feed.
Carbonate powder and how to make it
Calcium carbonate can be obtained pure from marble or by passing it through carbon dioxide and processing the stone to make calcium hydroxide. The calcium powder made in this step is a colorless and odorless white powder that has different and interesting properties.
Differentiation of calcium carbonate powder and talc powder in the production of filler masterbatch
Talcum powder or calcium carbonate can be used to make masterbatch fillers in different industries. These 2 powders reduce the cost, the weight of the product and the higher strength of what this material is used in.
These 2 powders do not appear to be very different from each other, but the fact is that there are differences between these 2 that the use of each changes the performance of the products.
Talcum powder is in the form of flakes, but calcium carbonate powder is in the form of granules. Considering the difference in their shape, it can be said that the strength of talcum powder is higher. On the other hand, talc powder is more resistant to heat and impact.
Calcium carbonate powder is cheaper and whiter than talcum powder. Calcium carbonate has light and heavy types, but talcum powder has only 1 type. In general, the use of these 2 materials as fillers in the production of plastics or paints is very economical.
Familiarity with types of calcium carbonate
There are different types of calcium carbonate powder. One of them, which is widely used in the industry, is coated calcium carbonate powder. This powder is like normal calcium carbonate but coated with a very thin layer of stenaric acid.
Low oil absorption, prevention of particle accumulation, excellent coverage and waterproofness are the key properties of coated calcium carbonate powder. In various industries, the use of coating is also considered as a kind of help to the environment.
Applications of this product
Calcium carbonate powder is one of those products that has always been the focus of users due to its reasonable price and many advantages. We will examine the many uses of this valuable, useful and widely used material.
Building Materials
Calcium carbonate powder is used to make various building materials such as cement, concrete and mortar. Calcium carbonate has good adhesive properties, so it is used among bricks.
paper making
Calcium carbonate powder is used for surface coating or filler in the paper industry. This material increases the strength and resistance of the paper to a very high level, thus it is very suitable for making design papers.
With the help of this material, the glossiness and ink absorption of the paper can be increased several times. It is interesting to know that this cheap filler has greatly reduced the cost of paper production.
In developed countries, we see that the use of wood for paper production has decreased to a great extent and has even reached zero in some cases. In these countries, calcium carbonate powder is used as a filler.
animal feed and
Calcium carbonate powder is used as a food supplement in animal and poultry feed. This material is beneficial for livestock farmers both from an economic point of view and from a qualitative point of view, it helps to improve the condition of livestock.
Calcium carbonate powder, which is used in the form of supplemental tablets, also has a positive effect on the strength of the bones of living organisms.
Rubber Manufacturing
One of the industries in which the use of calcium carbonate powder is very economical is the rubber manufacturing industry. Using this product, you can achieve a smooth and uniform surface in the rubber.
On the other hand, by using calcium carbonate powder, the resistance of rubber has increased, as a result, you can sell them at a higher price.
Chemical manufacturing
One of the most important advantages of calcium carbonate is its very fast decomposition in nature. It is suggested that this powder should be used in industries such as plastic or toothpaste production so that the cycle of its return to nature takes place sooner.
coloring
Calcium carbonate powder is also very useful in making paint. It is suggested to use calcium carbonate powder in order to reduce costs in making paint. This powder is the best substitute for titanium oxide.
Since this material has good pigments and is a strong filler, it is the best alternative to other expensive fillers.
metallurgy
Among the industries in which calcium carbonate powder is used for the purification of materials, we can mention the iron smelting or steel making industry.
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