Trash minerals in common quartz sand vary by geographic location and deposit characteristics, but the following are some common trash minerals that may be present in quartz sand:
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Feldspar: Feldspar is a kind of aluminum-containing mineral, and the common ones are albite and potassium feldspar. They are usually white, pink, or gray. Feldspar is a common impurity in quartz sand, which can affect the purity and transparency of quartz sand.
Mica: Mica is a flaky mineral; the common ones are muscovite and biotite. They may exist in the quartz sand as fine flake particles, affecting the texture and transparency of the sand body.
Iron oxide minerals: Such as hematite and magnetite, give quartz sand a different color, which may affect its use in areas such as glass manufacturing.
Clay Minerals: Quartz sand may contain clay particles that can affect the fluidity and processing properties of the sand body.
Carbonate minerals: Such as calcite or dolomite, usually exist in the form of fine particles. These minerals&#; presence may affect the quartz sand&#;s chemical stability.
Other metal oxides: Such as zircon (zircon) and so on. These minerals can affect the chemical composition of the quartz sand.
Organic matter: Organic matter residues may also be present in quartz sand, mainly if formed in a natural environment.
The zero electric point of impurity minerals in quartz sand refers to the pH value in solution when the mineral surface has a specific charge, that is, the pH value at which the surface charge is neutralized. At this pH value, the charge on the mineral surface will become neutral, affecting the interaction between the mineral and other substances, such as adsorption, precipitation, etc.
The following are the zero-electric point ranges of impurity minerals in some typical quartz sands. Note that these values may vary due to deposit origin, experimental conditions, etc.
The zero charge point of mica is in the pH 2-4 range.
Hematite has a zero charge point around pH 9, and magnetite has a zero charge point in the pH 6-7 range.
Calcite has a zero charge point between pH 8-9, and dolomite has a zero charge point in the pH 9-10 range.
Zircon has a zero charge point around pH 6-7.
Mineral Name
Zero Point (PZC)
Potassium feldspar K(AISi3O8)
1.4-1.7
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Albite NA(AISi3O8), Anorthite Ca(AI2Si2O8)
1.9-3.6
Muscovite KAI2[Si3AIO10] (OH, F)2
1.0
Quartz SiO2
2.0
Apatite Ca5(PO4)3(OH,F,CI)
4.0-7.0
Magnet Mine Fe3O4
6.3-6.7
Hematite Fe2O3
5.2-8.7
Ilmenite FeTiO3
5.6
Goethite FeOOH
5.9-6.9
These zero electric point values are approximate and can be determined by measuring properties such as charge in a laboratory setting. Knowing the point of zero electricity of impurity minerals can help optimize the beneficiation and processing of quartz sand for more efficient separation and purification. In different industrial applications, this information also helps predict and control impurities&#; behavior to obtain quartz sand products of desired purity.
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