With perlite as main components, made of insulating refractory products. With the expanded perlite aggregate, expanded perlite with appropriate amount of binder, such as cement, water glass, phosphate, insulation products, stirring, mixing, molding, drying, roasting or curing a. Low density expansion perlite, generally only 40 ~ 120kg / m3; refractory degree is not high, the expanded perlite is generally 1280 to 1360 DEG C. The highest temperature of different binder products is usually used below 1000 C.
Expanded perlite products, according to the type of cementing agent is composed of cement with expanded perlite products, water glass with expanded perlite products, phosphate with expanded perlite products and asphalt perlite products etc.,. China national standard, according to the volume density of its products are divided into 200, 250, 300 and 350kg / m3 class 4.
Expanded perlite products introduction
Expanded perlite is a kind of white paint and porous particles obtained by roasting the Pearl expansion disposal material honeycomb structure and arson, and other uses sound insulation material of perlite is mainly composed of glass, a natural silicic lava volcano of non-metallic mineral, contain perlite, pitchstone and obsidian, only crystal the water content of three different coatings. Because of the high temperature of 1000~1300 DEG C under the premise of the rapid expansion of the volume of 4~30 times, it is referred to as the expanded perlite. General requirements for expansion of 7~10 times the Obsidian 3 times, about 70% of available silica. Open pit mining. Without mineral processing, simply broken, screening can be. Can be used as filtering agent, catalyst and production process of expansion perlite.
From the mine after mining ore by mechanical crushing, screening into oscillation type anticorrosive paint has certainly is the size grading of iron ore, expansion plant according to different purposes at purchase. The water content of raw perlite ore is usually 4-6%, because of the high water content, heated to high temperatures, rapid volatile water will cause the perlite burst. So, first of all should be invalid water content in removal of pre expansion perlite, which required reserves of normal expansion of water through a large number of domestic and international laboratory test and production plant summary, expanded perlite content in 2.2-2.4%, after the expansion of the best effect, the expansion ratio of fluorocarbon paint is loose density the lowest level.
Therefore, the expanded perlite production process should include two key processes of preheating, expansion. Expansion: after the preheat of ore, the feeding assembly symmetry Saxiang temperature maintained at 1100-1200 DEG C high temperature flame, sand will be sharply heating and rapid expansion to the original volume of 10-30 times, the expanded perlite particles are white or grayish, with internal honeycomb structure expanded perlite with high temperature gas after Cyclone a feeder into the separator separation behind the bunker, high temperature gas contains a small amount of dust by the bag dust removal assembly to remove dust back into the atmosphere in fluorocarbon lacquer. Poor premise of the factory is to set up a special assembly to remove dust, but the characteristics of the high temperature gas discharged directly expanded perlite insulation material is the adiabatic performance, and zinc rich epoxy primer has excellent heat-resistant performance, acid and alkali corrosion, non-toxic and harmless. Moisture absorption rate is very small, persistent storage and application of stable quality.