Vermiculite, the chemical formula Mg x (H 2 O) {Mg 3-x [AlSiO 3 O 10 (OH) 2}, is a water magnesium aluminum silicate secondary metamorphic minerals, like mica shape, usually made by the black (gold) mica by hydrothermal alteration or weathering, because of its thermal dehydration expansion was flexure-like shape resembles a leech, so called vermiculite. 
 Vermiculite according to the shape after the expansion is stubble vermiculite and vermiculite in oblique stubble. Vermiculite, calcined in 800-1000 ℃ for 0.5-1min, volume increases rapidly 6-150 times, up to 30 times the color becomes golden yellow or silvery white, to generate a loose texture of expanded vermiculite and expanded vermiculite stone with heat insulation, cold frost and the good performance of sound insulation, bulk density 80-200kg/m3, thermal conductivity of 0.047-0.081W / (m · K), refractoriness 1300-1350 ° C, the sound frequency 512Hz The sound absorption coefficient of 0.53-0.63, relative humidity of 95% -100% of the environment, 24h moisture absorption rate of 1.1%, soaked in water for 1h, the quality of water absorption 265%, the volume of water absorption was 40.6%. Roasting point is 1370-1400 ° C, tasteless, non-toxic, does not rot, antibacterial, but not acid, the dielectric properties are relatively poor. 
 Vermiculite stage division of the vermiculite ore and expanded vermiculite, can be divided by color golden vermiculite, silver-white vermiculite, white vermiculite. 
 Product specifications :8-12MM ,4-8MM ,2-4MM, 1-2MM ,0.3-1MM, 40-60 mesh ,60-80 mesh ,80-100 mesh, 100 mesh, 150 mesh, 200 mesh, 325 mesh , the specifications are available upon request to produce. 
 (A) Uses 
 Vermiculite use after the expansion is very extensive, but its main purpose is still to make building materials. 
 The main use of vermiculite in Table 1. 
 The main purpose of the Table 1 vermiculite 
 Applications main purposes: 
 Construction: lightweight concrete aggregates (light walls of lightweight materials powder, light mortar) 
 Heat-resistant materials, wall materials, fireproof board, fireproof mortar, refractory bricks 
 Insulation, heat insulation sound-absorbing material underground pipes, greenhouse pipe insulation, indoor and tunnel interior public spaces of walls and ceilings 
 Metallurgy: steel frame coated wood, iron, cast the deslagging high-rise building steel frame coated materials, vermiculite bulk material 
 Agriculture, forestry, garden: gardening and golf course turf, seed conservation agent, soil conditioner, wetting agents, plant growth agents, feed additives 
 Marine fishing industry, fishing erbium 
 Other aspects: active carrier of the adsorbents, filter aids, chemicals and fertilizers, sewage treatment, seawater oil pollution adsorption 
 (B) the application of different on-chip path vermiculite 
 Piece diameter size of the vermiculite used for different purposes 
 +20 Head: Housing insulation equipment, household refrigeration device, car muffler, noise plaster, safe and a cellar lined pipe, boiler retaining thermal clothing, iron ladles, firebrick insulation cement 
 20 ~ 40 mesh: Automotive insulation equipment, aircraft insulation equipment, cold storage insulation equipment, bus insulation equipment, siding water cooling towers, steel annealing, fire extinguishers, filters, cold storage 
 40 to 120 mesh: oil, carpets, roof panels, cornices, dielectric gates board 
 Head: 120 ~ 270 wallpaper print, outdoor advertising, paint, increase the viscosity of the paint, photographic soft wood with fire card paper 
 -270 Mesh: gold and bronze ink, paint the outside supplements 
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