(a) physical properties
appearance | lustre | color | density g/cm 3 | hardness | bulkdensity kg/m 3 | Melting Point | Compressive Strength MPa | Refraction limit | Moisture % |
Scaly, flaky or monoclinic false crystals,scales can be stacked one millionwithin 2.54cm thickness | Pearl sheen, oil sheen, dull surface, a variety ofgloss | Golden yellow, brown, brown green,dark green,blackand mottled | 2.2~2.8 | 1~1.5 | 1100~1200 | 1320~1350 | 100~150 | Ng=1.525~1.561 Np=1.545~1.581 | 7 |
(b)the chemical composition of the vermiculite for differentorigin:
Country | SiO2 | MgO | Al 2 O 3 | Fe 2 O 3 | Co 2 O 3 | K 2 O | CaO | P 2 O 5 | S | Mn3O4 | Cl | H 2 O |
China | 32.45 | 7.85 | 15.53 | 22.73 | 2.25 | 2.28 | 10.10 | |||||
Japan | 38.64 | 22.68 | 14.94 | 9.29 | 0.29 | 7.84 | 1.23 | tiny | tiny | 0.11 | 0.28 | 5.29 |
America | 38.99 | 20.26 | 14.46 | 9.99 | 0.01 | 4.70 | 1.83 | 0.04 | 0.03 | 0.13 | 0.02 | 9.59 |
SouthAfrica | 39.57 | 23.37 | 12.08 | 5.45 | 2.46 | 1.46 | 0.15 | 0.18 | 11.20 |
(c)The vermiculite chemical composition of our factory:
element | SiO2 | Al2O3 | MgO | Fe2O3 | CaO | PH | H2O |
Content(%) | 37-42 | 9-17 | 11-23 | 5-18 | 0.5-0.8 | 8-11 | <1 |
Vermiculite is widely used in construction,metallurgy,chemicalindustry, light industry, machinery,electric power,petroleum,environmental protection and transportationdepartments.
