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  2. Rapid sand filter - Wikipedia

    en.wikipedia.org/wiki/Rapid_sand_filter

    Rapid sand filters use relatively coarse sand (0.5 to 1.0 mm) and other granular media, such as anthracite, in beds of 0.6 to 1.2 metre depth to remove particles and impurities that have been trapped in a floc through the use of flocculation chemicals—typically alum. Since media other than silica sand can be used in such filters, a more ...

  3. Sand filter - Wikipedia

    en.wikipedia.org/wiki/Sand_filter

    The depth of the sand bed is recommended to be around 0.6–1.8 m (2–6 ft) regardless of the application. This is linked to the maximum throughput discussed below. [5]: 302–303 Guidance on the design of rapid sand bed filters suggests that they should be operated with a maximum flow rate of 9 m 3 /m 2 /hr (220 US gal/ft 2 /hr). [7]

  4. Spray bottle - Wikipedia

    en.wikipedia.org/wiki/Spray_bottle

    In the late 1960s, spray bottles with trigger-style actuators appeared and quickly became popular, as this design was less fatiguing to use. The original pump-style bottle remained more popular for applications like non-aerosol deodorants, where size was a factor and repeated pumps were not required.

  5. Sandblasting - Wikipedia

    en.wikipedia.org/wiki/Sandblasting

    Silica sand can be used as a type of mineral abrasive. It tends to break up quickly, creating large quantities of dust, exposing the operator to the potential development of silicosis, a debilitating lung disease. To counter this hazard, silica sand for blasting is often coated with resins to control the dust.

  6. Spray (liquid drop) - Wikipedia

    en.wikipedia.org/wiki/Spray_(liquid_drop)

    Spray application of herbicides, insecticides, and pesticides is essential to distribute these materials over the intended target surface. [20] Pre-emergent herbicides are sprayed onto soil, but many materials are applied to the plant leaf surface. Agricultural sprays include the spraying of cropland, forest, turf grass, and orchards.

  7. Precipitated silica - Wikipedia

    en.wikipedia.org/wiki/Precipitated_silica

    Precipitated silica is an amorphous form of silica (silicon dioxide, SiO 2); it is a white, powdery material. Precipitated silica is produced by precipitation from a solution containing silicate salts.

  8. Silicon dioxide - Wikipedia

    en.wikipedia.org/wiki/Silicon_dioxide

    Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO 2, commonly found in nature as quartz. [5] [6] In many parts of the world, silica is the major constituent of sand. Silica is one of the most complex and abundant families of materials, existing as a compound of several minerals and as a

  9. Colloidal silica - Wikipedia

    en.wikipedia.org/wiki/Colloidal_silica

    In papermaking colloidal silica is used as a drainage aid. It increases the amount of cationic starch that can be retained in the paper. Cationic starch is added as sizing agent to increase the dry strength of the paper. High temperature binders; Investment casting - used as the inorganic binder in moulds; An abrasive - for polishing silicon wafers

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