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Calcium carbonate makes up almost one-twentieth of the earth’s crust. But the abundant mineral is found in many living things, including the human body. However, processing calcium carbonate extracts the multi-purpose material from inorganic sediments, namely limestone, chalk, and marble.

Which calcium carbonate equipment do you need?

Inline batch mixer for solids and liquids

Several issues often arise when your process requires batch-wise mixing of powde...

Vertical agitated dry media mill

A vertical agitated media mill is used for grinding ultrafine particles, in an agitated (or...

Horizontal rotary ball mill drum

A horizontal rotary ball mill drum can be used for grinding of dry hard materials, such as ...

High throughput air classifier for minerals

Standard classifier for high outputs in the fine to medium-fine separation ran...

Air flow classifier

Air-flow classifier (pneumatic product feed) for the fine classification of talc, calcium carbonate, bent...

Air classifier for minerals

Ideal for the ultrafine classification of soft to medium-hard materials, such as calcium carbona...

Single-wheel air classifier

For medium-sized fines yields in the mineral powder and filler industry.

Ultrafine pin mill

Particularly designed for humid, oily, and greasy products.

Pre-crusher of plates

With a pre-crusher continuous flakes are made into pieces, before granulation.

Horizontal chemical scraper centrifuge

For slurries difficult to discharge, a scraper can improve process reliability, effi...

Belt filter press

When a saturated slurry or sludge must be dehydrated in a continuous process municipal waste water treatmen...

Big bag discharge system

Dust emissions, product loss and product contamination are the main risks when discharging products ...

Simple valve sack packer

Sometimes in the packing process, product leaks out of the top of a bag that has just been filled. A...
rotary bag packer for valve bags

Rotary bag packers for valve bags

Quick filling of bags while avoiding leakage out of the top of a bag can be challenging o...

Traditional palletizer for bags

Packaging lines may require a single, flexible solution that can handle many different palle...

Palletizing robot arm

For high speed palletizing, palletizing high payloads, or just where greater flexibility is required, i...

Semi-automatic stretch wrapping machine

At lower speeds, some level of automation is required to provide a cost-effective m...

High volume particles separation sieve

For large scale production processes in the chemicals or food industries that requir...

Open mouth bag filling machine for powders

The packaging of powdery products such as flour can be challenging as it is cru...

Milling and drying machine for fine powders

When you need to produce ultra-fine powders, the milling and drying process em...

Flash drying grinder for powders

Drying and grinding can be an important feature when trying to process products such as raw...

Grinding and drying of CaCO3

Widely used in the construction industry as filling materials, calcium carbonate is usually mad...

Stories about Calcium carbonate

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Use a rotary kiln calcium carbonate processing of limestone stock smaller than 40 millimeters

Limestone is subjected to high temperatures to strip carbon dioxide and produce calcium oxide. This calcination process is performed in a kiln, but the type of technology depends on the feed size of your raw material.

A shaft kiln typically handles limestone between 20 mm and 175 mm in size. Stones go through preheating, heating, and cooling as they travel down the shaft to discharge quicklime. A rotary kiln employs the same principle but is set at a horizontal position and tipped at an angle of around 4°. This structure accommodates finer stones in the 15 mm to 40 mm range.

Mix calcium slurry constantly to avoid crystallization of particles

Calcium oxide is hydrated to produce calcium hydroxide. Also known as slaked lime, this compound treats industrial wastewater and neutralizes gases.

Slaking temperature is critical to the structure of particles. If you heat the slurry to around the boiling point of water forms finer particles sizes with a smaller specific surface. But unless mixed well, the particles will crystallize and agglomerate in the slurry.

Precipitated calcium carbonate can achieve 99.9% purity

Precipitated calcium carbonate (PPC) is synthetically produced from the chemical reaction between carbon dioxide and “milk-of-lime” slurry. The material is a refined form of limestone using calcium carbonate processing techniques.

The white material serves as a filler in different applications such as paints, papers, and pharmaceutical products. The grain size can be controlled from submicron to more than 10 microns, and the purity can be increased to 99.9%.

Spongy form of calcium carbonate could open up new applications

Researchers stumbled upon a spongy form of calcium carbonate occurring naturally in mussels.  Ground shells of the mollusc reacted to acetic acid to form a highly absorbent type of calcium carbonate.

The porous material can soak up contaminants like oils or dyes and is an object of interest for a range of biomedical applications.

Processing steps involved in calcium-carbonate making

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