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Industrial drying machines are designed to remove moisture from your product. But the drying process must cater to variations in the state of matter and molecular structure of the input material. Industrial dryer technology exploits the modes of heat transfer (convection, conduction, radiation, evaporative cooling) to control the moisture content.

Drying

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.

Calcium carbonate

For slurries difficult to discharge, a scraper can improve process reliability, efficiency and operating cost. At a reduced speed, the scraper knife swings into the filter cake and scrapes out the product vertically downward via the discharge chute.


<h2>High solids throughput with low energy consumption</h2>
The Ferrum HCZ 1000 and 2000 centrifuges were purposely designed for high throughputs and continuous operation under the toughest conditions in the chemical and fine chemical industry. The design features are robust and very reliable in accordance to the latest standards and directives. The centrifuges are built for permanent operation under the toughest conditions.

The Horizontal chemical scraper centrifuge is widely tested for herbicides and pesticides, special applications such as ABS, iron sulphate, melamine and so on can also be developed.

Horizontal chemical scraper centrifuge

When you need to produce ultra-fine powders, the milling and drying process employed is what ensures the consistency of your product. To process minerals and chemicals, you need a machine which is powerful, flexible, simple to maintain.


<h2>Versatile and highly efficient milling and drying</h2>
Atritor’s cell mill has been constructed to produce ultra-fine powders. It is able to grind, flash dry, classify and surface coat powders at the same time. Its capacity ranges from 50 kilograms per hour to 15 tonnes per hour, with evaporation rates up to 3,000 kilograms per hour.

The feed can be dosed directly into the machine via a screw feeder or via the inlet air duct. It is then ground in a vertically mounted, multi-stage rotating rotor. Each of the rotor sections is constructed with up to 200 quick-change blades. There is also the possibility for a classifier which is mounted at the discharge section to ensure that oversized feed particles are either discarded or recirculated.

The mill acts as an efficient dryer when the process air is heated using a hot air generator or even waste heat from another process. It can reach an inlet temperature of up to 450ºC. Heat energy from the process can be recovered from the heated air stream and utilized to preheat the intake air. After flash drying, the product is kept cool due to evaporative cooling via the constant exposure of new surface areas of the product created during attrition.

In the case of minerals that require surface treatment, the cell mill provides a range of coatings and surface modifiers that can be added on the side of the machine during the milling process. It has a wide range of applications, from minerals like GCC, clay and limestone to chemicals, dyes, pigments and a wide range of food ingredients and by-products.

Milling and drying machine for fine powders

Drying and grinding can be an important feature when trying to process products such as raw and refined minerals, organic and inorganic chemicals, food ingredients and waste streams. It is crucial to maintain particle size and consistent quality of the finished product during such processes. You will need an efficient and abrasion resistant attrition solution to pulverise and dry your product into your required particle size.


<h2>A simplified process while drying and grinding ensuring high product quality</h2>
Atritor’s Dryer-Pulveriser is able to grind and dry the product simultaneously. It is an air-swept mill that uses an air stream to efficiently process the product and controls the final particle size. It is able to process feedstocks of up to 50+mm and production capacities from 100kg/h up to 30t/h with evaporation rates up to 6,000 kilograms per hour.

The mill acts as an efficient dryer when the process air is heated using a hot air generator or waste heat from another process. It can reach an inlet temperature of up to 550ºC. Heat energy from the process can be recovered from the heated air stream. After flash drying, the product is kept cool due to evaporative cooling. The output temperature of the product is maintained accordingly to control the moisture content of the product.

The Flash drying grinder for powders is configured with a combination of variable speed rotor, hammer arrangement and fixed pins. Turbulence inside the grinding area creates attrition to reduce the particle size, which can be controlled for simple deagglomeration of the product. An internal classifier configuration can also be used to further control particle size.

The ‘A’-series is constructed with internals that are resistant to abrasion for applications that can cause high amounts of wearing to the equipment. Where the desired amount of evaporation required far exceeds the grinding duty, the ‘B’-series machine of a lighter weight, fully fabricated configuration permitting higher airflows can be used for non-wearing product or duties, as well as for for applications in which stainless steel contact parts may be necessary.

Flash drying grinder for powders

Atritor (https://www.atritor.com/) has more than 90 years of experience in simultaneous drying and milling solutions for fine powders.

We eat it; we wear it; we plaster it. But, most importantly, we grind it. Calcium carbonate is a pervasive material found in a raft of everyday products. Virtually all industries depend on it, either as a final or an intermediary product. But GCC is not all of a size, and a plurality of applications means different preparation requirements.

Ground calcium carbonate grains can be as coarse as 1,300 microns in poultry feed or as fine as 2 microns in paper coatings.

Milling the limestone to the correct particle size distribution is a test for GCC processing. But addressing this challenge successfully makes the difference between high and low-quality calcium carbonate materials.


<h2>Mastering impact, shear, and attrition to control particle size</h2>
Crushed limestone is turned to powder in a spectacular engineering phenomenon that occurs at a millimetric level. <a href="https://making.com/calcium-carbonate">Calcium carbonate particles</a> are broken down through impact, shear, and attrition.

Imagine you shank to a nanoparticle and were dropped into a limestone-grinding mill. It would feel like a galactic clash. The blades in the equipment break the rocks by the force of impact; the swirling particles shear off against each other; large particles attrite smaller ones flying at different velocities.

But devising this intricate process to produce homogenous grains of accurate dimensions takes expertise with the raw material. Control over the impact, shear, and attrition parameters allows you to produce the right particle size distribution that matches multiple applications.
<h2>Find the right fineness profile for the job</h2>
Calcium carbonate is ubiquitous in manufacturing but producing it at a suitable grade demands precision and flexibility from the milling technology. Grinding is not simply a race to the finest grain size – equipment has to adapt to the specific use. The requirements change not only by industry but by manufacturer too.

Wood coatings, for example, typically use calcium carbonate as a filler. But manufacturers employ GCC of different grain sizes in their formulas, depending on the product range. Polymers made primarily to enhance the aesthetic effect of wood use GCC with a particle size distribution of around 7 µm. Coating products designed for scratch resistance require finer grains of about 3 µm.

Ground calcium carbonate is a versatile material, but its effectiveness is determined by the precision of particle dimensions.  The power of GCC lies in its broad fineness spectrum, whether it is formulated into an antacid tablet, used to dye a silk shirt, or mixed to increase the adherence of wall paints.

Grinding calcium carbonate down to size

Mineral

The nearly 5,000 known minerals on earth share some characteristics to be classified as minerals – they are inorganic, solid, naturally occurring elements and have a particular chemical formula and an ordered internal geometric structure. However, minerals are not all the same. One way to divide them is based on their physical characteristics such as hardness, luster, color, and shape. For example, the diamonds we use to make jewelry are very hard minerals while talc is a soft mineral; gold is a shiny mineral while others are less so.

Minerals

Find production technology for Calcium Carbonate Drying, and connect directly with leading machine manufacturers worldwide

Calcium Carbonate Drying

Which calcium carbonate drying equipment do you need?

Horizontal chemical scraper centrifuge

Milling and drying machine for fine powders

Flash drying grinder for powders

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