Expanded vermiculite

Expanded vermiculite and its products are modern light and high efficient moisturizing materials, with excellent insulation, cooling, insulation, sound absorption, earthquake resistance, fire resistance, frost resistance and other properties will not rot, never deteriorate, no toxicity and irritation, easy to use, easy to install, cheap cost.

Application of expanded vermiculite: adiabatic material, fireproof material, seedling raising, flower planting, planting tree, friction material, sealing material, electrical insulation material, paint, plate, paint, rubber, refractory, hard water softener, smelting, building, shipbuilding, chemistry and other industries.

The expanded vermiculite has excellent insulation, sound insulation, insulation, flame retardancy and cation exchange properties. So vermiculite is widely used in many departments. It is used for asbestos free friction materials. Because its relative density is only 1/7 of sand and stone, it can be made into bricks, roof boards, etc. for high-rise building walls. Moreover, because the thermal conductivity of vermiculite is very low, it can be used as a heat insulation (insulation) layer as a wrapping material for gas transportation, water delivery and oil pipeline, which can greatly save energy. Because vermiculite interlayer contains exchangeable cations, it can be used for environmental protection. It is used to treat wastewater or adsorb oil on the surface to purify the environment. It can be used in agriculture to keep soil moisture and moisture to improve the soil structure and improve the soil structure. It has a good effect on the improvement of sandy soil in arid areas. In the gardening area, vermiculite can be used for cultivation of flowers, vegetables and fruits, and for raising seedlings. It is also suitable for planting turfgrass. Because it enables crops to get enough water and nutrients from the early stage of growth, plants can grow quickly. One of the main materials for planting media can be used in combination with peat and perlite. Sowing cover.  Properly adjust the pH value of the medium. Some experiments have been done to add 0.5-1% vermiculite to compound fertilizer, which can increase crop yield by 15-20%. The expanded vermiculite can also be used as feed additive for animal husbandry, as absorbent and fixing agent. After adding the expanded vermiculite in the feed, it can absorb the toxic substances in the feed, improve the quality of the milk and eggs, reduce the odor of the feces, reduce the humidity, and postpone the growth environment of livestock. Good.

1. Physical properties

The expanded vermiculite has excellent properties such as heat insulation, frost resistance, antiseptic, fireproof, water absorption, sound absorption and so on. It can be roasted for 0.5 to 1 minutes at 800~1000 C, and the volume can be increased by 8~15 times rapidly and up to 30 times as high as it is. The color becomes golden or silver white, forming a loose expansive vermiculite, but it is not acid resistant, and its dielectric properties are also poor.

Two. Chemical composition

Expansive vermiculite is a complex hydrous aluminosilicate mineral with complex chemical composition. It is difficult to use single chemical formula because of its unstable variation. Generally speaking, the chemical formula of vermiculite is: (Mg, Ca) 0.7 (Mg, Fe 3+, Al) 6 [(Al, Si) 8 O 20] (OH 4. H 2 H). In general, SiO 237 ~ 42%, Al 2 O 39 ~ 17%, Fe 2 O 35 ~ 18%, MgO11 ~ 23%, H 2 O5 to 11%, Ca, Na, K content is uncertain. But because of the different degree of hydration, oxidation is different, even if it is vermiculite, its chemical composition is also difficult.