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![Perlite is one of nature’s most versatile and efficient minerals. It is formed by molten (magma-tic) rock, also known as
volcanic glass. Over time, and during formation and cooling, water is absorbed into the raw perlite ore matrix, giving perlite
its unique ability to expand when heated.
The expansion process renders the perlite partially transparent, and the resulting complex refraction changes the color from
a light gray to bright white.
Hengyang Perlite Processing
Perlite is a glassy volcanic rock with a pearl-like luster. It usually exhibits numerous concentric cracks that cause it to
resemble an onion skin. A typical perlite sample is composed of 71 to 75 percent silicon dioxide, 12.5 to 18.0 percent
alumina, 4 to 5 percent potassium oxide, 1 to 4 percent sodium and calcium oxides, and trace amounts of metal oxides.
Crude perlite ore is mined, crushed, dried in a rotary dryer, ground, screened, and shipped to expansion plants.
Horizontal rotary or vertical stationary expansion furnaces are used to expand the processed perlite ore. The normal size of
crude perlite expanded for use in plaster aggregates ranges from plus 250 micrometers (μm) (60 mesh) to minus 1.4
millimeters (mm) (12 mesh). Crude perlite expanded for use as a concrete aggregate ranges from 1 mm (plus 16 mesh) to
0.2 mm (plus 100 mesh). Ninety percent of the crude perlite ore expanded for horticultural uses is greater than 841 μm
(20 mesh).
Crude perlite is mined using open-pit methods and then is moved to the plant site where it is stockpiled. The first processing
step is to reduce the diameter of the ore to approximately 1.6 centimeters (cm) (0.6 inch [in.]) in a primary jaw crusher. The
crude ore is then passed through a rotary dryer, which reduces the moisture content from between 4 and 10 percent to less
than 1 percent.
After drying, secondary grinding takes place in a closed-circuit system using screens, air classifiers, hammer mills, and rod
mills. Oversized material produced from the secondary circuit is returned to the primary crusher. Large quantities of fines,
produced throughout the processing stages, are removed by air classification at designated stages. The desired size
processed perlite ore is stored until it is shipped to an expansion plant.
At the expansion plants, the processed ore is either preheated or fed directly to the furnace. Preheating the material to
approximately 430EC (800EF) reduces the amount of fines produced in the expansion process, which increases usable
output and controls the uniformity of product density. In the furnace, the perlite ore reaches a temperature of 760 to 980EC
(1400 to 1800EF), at which point it begins to soften to a plastic state where the entrapped combined water is released as
steam. This causes the hot perlite particles to expand 4 to 20 times their original size. A suction fan draws the expanded
particles out of the furnace and transports them pneumatically to a cyclone classifier system to be collected. The
air-suspended perlite particles are also cooled as they are transported to the collection equipment. The cyclone classifier
system collects the expanded perlite, removes the excessive fines, and discharges gases to a bag house or wet scrubber for
air pollution control.](https://image.slidesharecdn.com/perliteminingprocessmachinery-230407011241-66ebdde6/85/Perlite-Mining-Process-Machinery-pdf-2-320.jpg)
Uploaded byGary Li
Perlite Mining Process Machinery.pdf
Perlite is a naturally occurring siliceous rock that expands when heated. It is formed by volcanic glass absorbing water over time. Hengyang Perlite processes perlite ore by mining, crushing, drying, grinding, and expanding it in rotary or stationary furnaces. This causes the particles to expand 4 to 20 times their original size. The expanded perlite is then classified and collected for various applications. Some key uses of expanded perlite include insulation, filtration, agriculture substrates, hydroponics, fire protection, and construction materials.
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Perlite Mining Process Machinery.pdf
- 1. Perlite Mining ProcessMachinery & Projects Zhengzhou Hengyang Industry Co., Ltd Mail: sell@chinadjks.com Add: 500 West, cross road of Rizhao and Industrial road, Zhengzhou city, China Perlite Mining Tel:+8617367842747 Gary Li
- 2. Perlite is oneof nature’s most versatile and efficient minerals. It is formed by molten (magma-tic) rock, also known as volcanic glass. Over time, and during formation and cooling, water is absorbed into the raw perlite ore matrix, giving perlite its unique ability to expand when heated. The expansion process renders the perlite partially transparent, and the resulting complex refraction changes the color from a light gray to bright white. Hengyang Perlite Processing Perlite is a glassy volcanic rock with a pearl-like luster. It usually exhibits numerous concentric cracks that cause it to resemble an onion skin. A typical perlite sample is composed of 71 to 75 percent silicon dioxide, 12.5 to 18.0 percent alumina, 4 to 5 percent potassium oxide, 1 to 4 percent sodium and calcium oxides, and trace amounts of metal oxides. Crude perlite ore is mined, crushed, dried in a rotary dryer, ground, screened, and shipped to expansion plants. Horizontal rotary or vertical stationary expansion furnaces are used to expand the processed perlite ore. The normal size of crude perlite expanded for use in plaster aggregates ranges from plus 250 micrometers (μm) (60 mesh) to minus 1.4 millimeters (mm) (12 mesh). Crude perlite expanded for use as a concrete aggregate ranges from 1 mm (plus 16 mesh) to 0.2 mm (plus 100 mesh). Ninety percent of the crude perlite ore expanded for horticultural uses is greater than 841 μm (20 mesh). Crude perlite is mined using open-pit methods and then is moved to the plant site where it is stockpiled. The first processing step is to reduce the diameter of the ore to approximately 1.6 centimeters (cm) (0.6 inch [in.]) in a primary jaw crusher. The crude ore is then passed through a rotary dryer, which reduces the moisture content from between 4 and 10 percent to less than 1 percent. After drying, secondary grinding takes place in a closed-circuit system using screens, air classifiers, hammer mills, and rod mills. Oversized material produced from the secondary circuit is returned to the primary crusher. Large quantities of fines, produced throughout the processing stages, are removed by air classification at designated stages. The desired size processed perlite ore is stored until it is shipped to an expansion plant. At the expansion plants, the processed ore is either preheated or fed directly to the furnace. Preheating the material to approximately 430EC (800EF) reduces the amount of fines produced in the expansion process, which increases usable output and controls the uniformity of product density. In the furnace, the perlite ore reaches a temperature of 760 to 980EC (1400 to 1800EF), at which point it begins to soften to a plastic state where the entrapped combined water is released as steam. This causes the hot perlite particles to expand 4 to 20 times their original size. A suction fan draws the expanded particles out of the furnace and transports them pneumatically to a cyclone classifier system to be collected. The air-suspended perlite particles are also cooled as they are transported to the collection equipment. The cyclone classifier system collects the expanded perlite, removes the excessive fines, and discharges gases to a bag house or wet scrubber for air pollution control.
- 3. Hengyang Perlite ProcessFlowchart Hengyang Perlite Process Machinery: Vibrating Feeder Jaw Crusher Hammer Crusher Impact Crusher Cone Crusher VSI Sand Crusher
- 4. Vertical Sand CrusherBox Hammer Crusher Perlite Ore Grinding Ball Mill Grinding Rod Mill Rotary Kiln Rotary Dryer Contact with us for more details of production line. Perlite Application Industry Cryogenics: expanded perlite is an excellent insulator for low or very low temperature cryogenic systems. It is widely used in LNG (Liquefied Natural Gas) isolation tanks, noble gas tanks, oxygen, nitrogen, argon etc. in cryogenic state.
- 5. Mortars and refractoryelements: perlite is used as an ingredient in low to medium temperature refractory elements (up to 850°C) and it is used to build and/or coat ovens, furnaces, etc., and as a bonding material for joining refractory pieces. Isolation: passive fire protection. The manufacturing of mortars, plates and various accessories. Ceramic furnaces. Filtration: one of the most common uses of expanded perlite is as a filtering agent. The expanded and processed ore is chemically inert, and does not transfer taste, colour or odour to the filtrate. There is a wide range of perlite filters for various products such as beer, wine, water, oils, chemicals etc. Fire protection system petrochemical industry. Agriculture Substrates-peat: perlite can be mixed with all kinds of organic substrates, providing them with a distinct capacity to be well aerated. The structure of perlite remains unchanged over time and helps to regulate water consumption by acting as a reservoir. Hydroponics: of all the materials used for soilless cultivation, expanded perlite is the most important. In fact, several studies have shown that outstanding crops can be achieved with perlite hydroponic systems. Animal nutrition: perlite acts as a binding, anti-caking and coagulant agent. Due to its high absorption capacity, perlite is used to support and carry a wide variety of nutrients, fatty acids, vitamins and antibiotics used in the preparation of additives for animal feeds. Construction Gypsum: perlite is a basic ingredient in the development of new lightweight projected gypsum mortars. Monolayer Mortars: perlite is a basic ingredient in the manufacturing of projectable monolayer finish mortars.