Quartz Sand Beneficiation Methods & Process - JXSC Mineral

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.

 

Zero electric point of impurity minerals in quartz sand

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.

• Feldspar: The zero charge point of feldspar is usually between pH 2-3.
• Mica:

  The zero charge point of mica is in the pH 2-4 range.

• Iron Oxide Minerals:

  Hematite has a zero charge point around pH 9, and magnetite has a zero charge point in the pH 6-7 range.

• Carbonate Minerals:

  Calcite has a zero charge point between pH 8-9, and dolomite has a zero charge point in the pH 9-10 range.

• Zircon:

  Zircon has a zero charge point around pH 6-7.

Mineral Name

Zero Point (PZC)

Potassium feldspar K(AISi3O8)

1.4-1.7

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

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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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Quartz sand is an important industrial mineral material, widely used in glass, ceramics, refractory materials, metallurgy, and rubber. The general process of quartz sand beneficiation includes four stages: preparation, preliminary separation, separation, and deep purification.

01

Quartz Sand Preparation 

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The main task of pre-selection preparation is to fully dissociate the quartz sand and achieve the appropriate particle size range to prepare for subsequent operations. The main processes include crushing, grinding, and classification.

Crushing: The commonly used crushing equipment includes jaw crushers and impact crushers. Jaw crushers are mainly used for the coarse crushing of quartz, while impact crushers are used for fine crushing operations.

Grinding: The commonly used grinding equipment for quartz sand is a wet rod mill. The fineness of grinding can be controlled, and over-grinding is not easy to occur, which can achieve better results. Moreover, the rod mill also plays a certain role in scrubbing, and removing some impurities.

Classification: The ground products are classified, and the unqualified materials are returned for further grinding, which can effectively control the particle size of the selected materials and provide suitable conditions for separation operations.

02

Quartz Sand Preliminary Separation

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The main purpose of preliminary separation of quartz sand is to remove impurities such as ore slurry generated during the grinding process and the oxide iron film on the surface of quartz sand, to avoid their impact on subsequent separation operations and improve separation indicators. The main processes include washing and desliming, and scrubbing.

Washing and desliming: using hydraulic flushing to remove ore slurry and some clay impurities in quartz sand, the main equipment includes drum screens, desliming hoppers, hydraulic cyclones, etc.

Scrubbing: using mechanical external force and mineral friction to remove impurities such as oxide iron film on the surface of quartz sand, and to crush mineral clusters that have not completely dissociated into single particles. Commonly used equipment includes stirring scrubbers, spiral scrubbers, etc.

03

Quartz Sand Separation

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Common beneficiation processes for quartz sand include magnetic separation and flotation.

Magnetic separation: Quartz sand is a non-magnetic mineral, but iron-containing minerals such as hematite and brown iron ore are magnetic minerals, which can be removed by magnetic separators. The finer the quartz sand particle size, the better the iron removal effect.

Flotation: This method is commonly used to remove non-magnetic minerals such as mica and feldspar from quartz sand. The flotation of mica and feldspar is generally carried out in an acidic environment, so there is a certain requirement for the corrosion resistance of the equipment.

04

Quartz Sand Deep Purification

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When conventional beneficiation methods cannot effectively remove impurities deeply immersed or encapsulated in quartz sand, resulting in low purity of quartz sand, methods such as acid leaching and high-temperature roasting can be used for purification.

Acid leaching: Quartz sand is insoluble in acid, but acid can dissolve other impurities and remove impurities that other methods cannot effectively remove. However, acid leaching requires high operation requirements.

High-temperature roasting: Quartz sand is roasted at high temperature by adding chlorine gas, etc., so that the encapsulated impurities rupture, the impurities are exposed, or the deep impurities undergo reaction and transfer to the mineral surface for removal by other methods.

05

To Wrap Up

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The quartz sand beneficiation process consists of these four stages. But in actual application in the mining field, suitable processes and machines should be selected according to the ore properties, mineral composition, and impregnation characteristics of the quartz sand. You can click to knowthe quartz sand processing plant equipment list.

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