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Natural Color sand, Sintered sand, Vermiculite, Mica, Silica Sand, Rock Slice
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  • Natural color sand
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  • Vermiculite
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  • Our vermiculite product category has golden vermiculite, silvery white vermiculite. Varieties with vermiculite flake vermiculite, horticultural vermiculite, expanded vermiculite mixed, etc.

    Vermiculite is a kind of layer structure of water containing magnesium aluminum silicate secondary metamorphic minerals, ore outside like mica, usually by black mica (gold) through the hydrothermal alteration or weathering and become, it is because of its heated water expands flexure, form resembles leeches, therefore calls vermiculite. The chemical formula which best characterizes the vermiculite for Mg x (H 2 O) {3 ~ x [AlSiO 3 O 10 Mg) (OH) 2}. Vermiculite by stages are divided into vermiculite ishihara ore and expanded vermiculite, according to the color classification can be divided into golden vermiculite, silvery white vermiculite, milky white vermiculite.

    Vermiculite has many excellent performances such as insulation, cold resistance, antibacterial, fire prevention, water absorption, sound absorption ans so on. Under the 800 ~ 1000 calcination 0.5 ~ 1.0 minutes, it can rapidly increase volume 8 ~ 15 times, Max. up to 30 times. After the expansion, the proportion is 50-200 kg/m3, Color turns into golden or silver, then generate a texture osteoporosis expanded vermiculite.

    Expanded vermiculite are widely used in construction, metallurgy, chemical industry, light industry, machinery, electric power, petroleum, environmental protection and transportation department, foreign mainly used in construction, insulation, packing and agriculture, horticulture, etc.



    A Mineral properties

    (a) P hysical properties

    Vermiculite has many excellent performances such as insulation, cold resistance, antibacterial, fire prevention, water absorption, sound absorption ans so on. Under the 800 ~ 1000 calcination 0.5 ~ 1.0 minutes, it can rapidly increase volume 8 ~ 15 times, Max. up to 30 times. After the expansion, the proportion is 50-200 kg/m3, Color turns into golden or silver, then generate a texture osteoporosis expanded vermiculite,but no acid, its dielectric properties are poor.

    (1) 100% relative humidity, 24 h.

    (2)- 20 , 15 times of freezing and thawing, the grain size of the same.

    (b) Chemical composition

    Vermiculite belongs to the hydrous aluminum silicate minerals which have complex chemical composition. Due to its uncertainty, expressed in a single chemical formula is difficult. In general, the chemical formula of vermiculite is: (Mg, Ca) 0.7 (Mg, Fe 3 +, Al) 6.0 [(Al, Si) 8.0 O20] (OH4·H2O4). Usually, the SiO2 is 37~42%, Al2O3 is 9~17%, Fe2O3 is 5~18%, MgO is 11~23%, H2O is 5~11%, the content of Ca, Na and K is uncertain. But due to the hydration degree is different, have different oxidation, even with vermiculite, its chemical composition is not the same.

    The main chemical composition of vermiculite in China

    The main purpose

    After high temperature roasting the raw vermiculite, the volume can quickly expand several times to dozens times, after the expansion of vermiculite average unit weight is 100 ~ 130 kg/m 3, with small air interval layer, so it is a good heat preservation, heat insulation, sound-absorbing, frozen erosion resistant building materials, fillers, coating, and refractory industry. Expanded vermiculite are widely used in construction, metallurgy, chemical industry, light industry, machinery, electric power, petroleum, environmental protection and transportation department, foreign mainly used in construction, insulation, packing and agriculture, horticulture, etc.

    (a) Main purposes

    After expansion of vermiculite usage is very extensive, its main use is as a building material. The consumption structure in United States in 1986, 52% expanded vermiculite is used for mortar and cement premix and lightweight concrete aggregate; Britain used for concrete, besmear mud walls, cement coagulant accounted for 40%.

    The main purpose of the vermiculite are shown in table



    (b)The applications of Different particle sizes of vermiculite

    Different particle sizes of vermiculite has different uses, the following table 6 lists several pieces of the application of vermiculite.

       

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