Perlite Properties
Perlite is a well-known volcanic rock that has a glassy texture and relatively high water content, usually formed by the hydration of obsidian. Due to having a lot of water, it takes a spherical shape. The amount of water with perlite is two to five percent. This mineral, which is a commercial and industrial product, consists of materials such as silicon dioxide, aluminum oxide, sodium oxide, potassium oxide, magnesium oxide, and calcium oxide. Its properties include the following Kurd:
▪️Low density
▪️Air porosity
▪️Ability to store extra water
▪️Grain stability and permanence
▪️Non-combustible (fireproof class A1)
▪️High structural support against static and dynamic loads. It has a neutral pH
Water in Perlite
Raw perlite contains 3 to 6% water, and due to heat at high temperatures, the water in the structure of the raw perlite stone evaporates and millions of tiny bubbles are formed in the structure of perlite.
Perlite Expansion
For this purpose, first, the natural perlite stone is crushed and after grinding, it is passed through a net to granulate. At this time, the resulting perlite is heated quickly and a light weight, white material with a large volume is produced. Expanded perlite is the result of dewatering. The side water that exists in it has entered as a secondary.
extraction and preparation of perlite
1- Raw stone extraction 2- Preparing for decoration 3- Poping in the furnace (puffing)
Final Product
Pearlite extraction is possible with relatively simple methods. The waste soil is removed by a bulldozer, and if this part is hardened, it will be excavated and then blasted and transported. After this step, the resulting stone directly enters the primary stone crusher at the mine site, and the crushed stone is then transported to the mill by truck or conveyor belt, etc. The preparation of perlite to enter the furnace is a very sensitive specialized operation, and the most important factor required is the size and standardization of grains and particles by crushing, flouring and screening.
There is a series of desired particle sizes depending on the composition of perlite, including its water content, and in the design of an ideal feed furnace, a furnace consists of particles with a diameter of 0.1-1%. It is important to remove particles smaller than 1% inch because they form very fine particles during expansion inside the furnace. Because perlite is relatively brittle and fragile and becomes more fragile due to microscopic cracks, it should be removed from the mill immediately after reaching the desired size to prevent excessive crushing. Sampling and analysis and sieving must be done regularly to ensure and control the product to be sent to the perlite expansion factory.
physical and chemical properties of perlite
Perlite has low thermal conductivity, good chemical stability and low water absorption. One of the physical properties of this type of perlite is its gray, black, brown, and red color, which can be seen in white when expanded. Fatty gloss and glass texture are other physical properties of this perlite, and its water percentage is 2-5%.
perlite ingredients
expansion of perlite reserves
One of the largest perlite deposits in the state of New Mexico, USA, is located near the city of Socorro, which consists of a dome with a diameter of 2,000 to 2,200 feet and an apparent thickness of 450 feet, with normal faults on the sides of the dome. has taken over The sides of the dome in the north and south are volcanic breccias and glassy tuff, which changes to clay and sandstone towards the top. Tuff and breccia are composed of perlite angle components and volcanic fragments of the older rocks of that area, which indicate sedimentary activities at the end of the main volcanic activity. Perlite is a dull ash color with flowing layers of pumice next to rhyolite, which is homogeneous throughout the reserve. Most of the current layers have a steep slope, which indicates the vertical movement of the dome during placement. This deposit is probably Pliocene.
Emerald Poish Mining Company is active in the field of perlite production in Urmia, contact us for more information: