Cryogenic filling project of expanded perlite ( pearlescent sand ) for thermal insulation of ultra-low temperature devices (on-site expansion, bulk material supply, pneumatic conveying of pipes, automatic filling).
Can be used as a filter, catalyst, molecular sieve and rubber, fertilizer, pesticide carrier. Widely used in construction, metallurgy, petroleum, machinery, light industry, hydropower, foundry, medicine, food, agriculture, forestry and horticulture departments. The normal temperature thermal conductivity is 0.0245 ～ 0.048W / (m · K), the high temperature thermal conductivity is 0.058 ～ 0.175W / (m · K), the low temperature thermal conductivity is 0.028 ～ 0.038W / (m · K), and the maximum use temperature is 800 ℃. Used as efficient heat preservation and cold filling material.
Expanded perlite is a white granular material with a honeycomb structure made of perlite ore after preheating and instantaneous high-temperature roasting expansion. The principle is: Perlite ore is crushed to form a certain size of ore, and it is preheated and roasted, and rapidly heated (above 1000 ° C). The water in the ore is vaporized, and it expands inside the softened glassy ore, forming a porous structure and volume expansion 10-30 times of non-metallic mineral products. Perlite is divided into three forms according to its expansion technology and application: open cell, closed cell, and hollow cell.