Calcination is loosely defined as thermal processing done at elevated temperatures to change the properties of a given material. Calcining is often applied to ores and other solid materials to bring about a thermal decomposition, phase transition or removal of a volatile fraction. The calcination process normally takes place at temperatures below the melting point of the material being calcined.
The process derives its name from the Latin word "calcinare," or "to burn lime," due to its most common application, the conversion of limestone to lime. This is actually the decomposition of calcium carbonate (limestone) into calcium oxide (lime) and carbon dioxide, in order to produce cement. The product of calcination is usually generally referred to as the "calcine," regardless of the actual minerals undergoing thermal treatment. The process is carried out in calciners that are furnaces, reactors or kilns of various designs.
Rotary Calciners are alloy steel cylinders that rotate inside a high temperature furnace. Fueled by electricity or gas, temperatures reach up to 2200 degrees Fahrenheit. Material is continuously fed into the cylinder, where temperatures are precisely controlled. Product goes through various stages within the calciner including drying, calcining and cooling, and feeds from one end to the other by way of a slight slant to the cylinder.
Rotary Calciners provide efficient high temperature processing, while minimizing your equipment costs, reducing environmental risks and maximizing product uniformity. Other benefits include greater product yields, reduced process time and a reduction in floor space. Capital expenditures may also be reduced as well as energy and operating costs.
Applications that are well suited to Rotary Calciners may include:
• Removal of free and bound waterCalcination Reactor Calciner
• Crystal structure changes
• Materials with fragile structures
• Processes requiring controlled oxidizing or reducing
• Materials requiring isolation
• Materials with fine particle size
• Materials that are conduction heat transfer limited
• Processes with reacton kinetics improved by solid/solid or solid/gas contact
• Processes that require exposure to a controlled repeatable temperature profile
• Processs that benefit from a minimized process gas structure
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Some industries that could benefit from calciners might include environmental cleanup, precious metal recovery, specialty chemical production and iron oxide production. Though the list of materials that can be processed through calciners is endless, typical materials processed might be:
• Activated Carbon
• Catalysts
• Ceramics
• Graphite
• Sludges
• Gypsum
• Titanium Dioxide
• Magnesium Oxide
• Torrefied Wood
• Contaminated Soils
• Kaolin
• Tungsten Compounds
• Diatomaceous Earth
• PET Flakes
• Uranium Compounds
• Ferrites
• Rare Earth Metals
• Vanadium
• Fiberglass Waste
• Silica Gel
• Zinc Oxide
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Many of these materials can then be used as ingredients of everyday products. Titanium dioxide is a key component of white paint; Silica gel is a dessicant used to keep food, clothing and electronics from collecting too much moisture; Magnesium oxide is one of the raw materials used to make Portland cement and also to treat heartburn; Activated carbon is the material that removes impurities from water in swimming pool and aquarium filters; Kaolin has uses ranging from the light-diffusing material in incandescent light bulbs to the gloss on certain types of paper.
Heyl & Patterson has built Rotary Calciners for decades, and is a leader in the industry. Heyl & Patterson’s Renneburg Rotary Calciners process hundreds of materials that are fine and dusty, sensitive to oxidation, combustible, explosive, potentially contaminating and thermally sensitive. Complete separation of the heat source and the product is guaranteed through indirect heating. Renneburg Rotary Calciners readily exceed the processing demands that manufacturers and customers have for materials that have a finer particle size and uniform quality. Designed for specific requirements and unique specifications, each piece of equipment is rigorously tested at our Pilot Plant Testing Lab before final design is implemented.
To contact Heyl & Patterson for a specialized consultation and learn how we can create a solution, click here:
Materials and Applications for Rotary Calciners
Materials and Applications for Rotary Calciners
Calcination is loosely defined as thermal processing done at elevated temperatures to change the properties of a given material. Calcining is often applied to ores and other solid materials to bring about a thermal decomposition, phase transition or removal of a volatile fraction. The calcination process normally takes place at temperatures below the melting point of the material being calcined.
The process derives its name from the Latin word "calcinare," or "to burn lime," due to its most common application, the conversion of limestone to lime. This is actually the decomposition of calcium carbonate (limestone) into calcium oxide (lime) and carbon dioxide, in order to produce cement. The product of calcination is usually generally referred to as the "calcine," regardless of the actual minerals undergoing thermal treatment. The process is carried out in calciners that are furnaces, reactors or kilns of various designs.
Rotary Calciners are alloy steel cylinders that rotate inside a high temperature furnace. Fueled by electricity or gas, temperatures reach up to 2200 degrees Fahrenheit. Material is continuously fed into the cylinder, where temperatures are precisely controlled. Product goes through various stages within the calciner including drying, calcining and cooling, and feeds from one end to the other by way of a slight slant to the cylinder.
Rotary Calciners provide efficient high temperature processing, while minimizing your equipment costs, reducing environmental risks and maximizing product uniformity. Other benefits include greater product yields, reduced process time and a reduction in floor space. Capital expenditures may also be reduced as well as energy and operating costs.
Applications that are well suited to Rotary Calciners may include:
• Removal of free and bound waterCalcination Reactor Calciner
• Crystal structure changes
• Materials with fragile structures
• Processes requiring controlled oxidizing or reducing
• Materials requiring isolation
• Materials with fine particle size
• Materials that are conduction heat transfer limited
• Processes with reacton kinetics improved by solid/solid or solid/gas contact
• Processes that require exposure to a controlled repeatable temperature profile
• Processs that benefit from a minimized process gas structure
(double click on picture to open in new window)
Some industries that could benefit from calciners might include environmental cleanup, precious metal recovery, specialty chemical production and iron oxide production. Though the list of materials that can be processed through calciners is endless, typical materials processed might be:
• Activated Carbon
• Catalysts
• Ceramics
• Graphite
• Sludges
• Gypsum
• Titanium Dioxide
• Magnesium Oxide
• Torrefied Wood
• Contaminated Soils
• Kaolin
• Tungsten Compounds
• Diatomaceous Earth
• PET Flakes
• Uranium Compounds
• Ferrites
• Rare Earth Metals
• Vanadium
• Fiberglass Waste
• Silica Gel
• Zinc Oxide
(double click on picture to open in new window)
Many of these materials can then be used as ingredients of everyday products. Titanium dioxide is a key component of white paint; Silica gel is a dessicant used to keep food, clothing and electronics from collecting too much moisture; Magnesium oxide is one of the raw materials used to make Portland cement and also to treat heartburn; Activated carbon is the material that removes impurities from water in swimming pool and aquarium filters; Kaolin has uses ranging from the light-diffusing material in incandescent light bulbs to the gloss on certain types of paper.
Heyl & Patterson has built Rotary Calciners for decades, and is a leader in the industry. Heyl & Patterson’s Renneburg Rotary Calciners process hundreds of materials that are fine and dusty, sensitive to oxidation, combustible, explosive, potentially contaminating and thermally sensitive. Complete separation of the heat source and the product is guaranteed through indirect heating. Renneburg Rotary Calciners readily exceed the processing demands that manufacturers and customers have for materials that have a finer particle size and uniform quality. Designed for specific requirements and unique specifications, each piece of equipment is rigorously tested at our Pilot Plant Testing Lab before final design is implemented.
To contact Heyl & Patterson for a specialized consultation and learn how we can create a solution, click here:
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