quartz processing, quartz equipment

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01

Quartz Sand Processing Washing desliming method

There are a variety of mineral impurities in quartz sand, and the grades of different impurities have a close relationship with the particle size of quartz sand. For example, the grade of SiO2 decreases with the decrescence of quartz sand particle size, and the impurities such as Fe, Al grade will rise with the decrescence of quartz sand particle size, this kind of phenomenon in clay minerals quartz sand is particularly significant. Therefore, it is necessary to carry out ore washing and desliming treatment.

The commonly used quartz sand processing washing method is mainly the scrub method (rod mill scrubbing and mechanical scrubbing). In production, the rod mill scrubbing effect is more ideal than mechanical cleaning. The scrubbing concentration is kept at 50% ~ 60%, and the scrubbing time is determined according to the ore nature, which is based on initially meet the product quality requirements. And the time should not be too long to avoid too much energy consumption and equipment wear.

In addition, in the quartz sand scrubbing processing, the scouring reagent can be added to change the composition of mineral particles, enhance the scrubbing effect and improve the efficiency of impurity removal.

Application:

Used to treat the quartz sand containing a large number of clay and mud, or used to remove the film iron and adhesive impurities on surface of the quartz sand.

Quartz Sand Processing Equipment required:

High-efficiency agitator washer, hydrocyclone, rod mill, hydraulic classifier, desliming bucket

02

Quartz Sand Processing Magnetic separation method

The magnetic separation method is based on the magnetic difference between quartz sand and associated impurities minerals. Low-intensity magnetic separation is often used for the strong magnetic minerals, while high-intensity magnetic separation is mainly used for the weak magnetic minerals, and the magnetic field intensity should be more than Oe.

It should be noted that the number of magnetic separations and magnetic field intensities should be effectively controlled when using the magnetic separation method. In general, with the increase of magnetic separation times, the iron content in the ore will decrease, but most of the iron can be removed only under a certain magnetic field intensity. In addition, the effect of iron removal is also related to the size of quartz sand. Usually, the smaller the size of quartz sand, the better the effect of iron removal.

Application:

Often used to remove the weak magnetic impurities (eg. hematite, limonite, biotite) and strong magnetic minerals (eg. magnetite) contained in the quartz sand.

Quartz Sand Processing Equipment required:

Magnetic separator, High-intensity magnetic separator (eg. high gradient magnetic separator)

03

Quartz Sand Processing Flotation method

If the scrubbing, washing and desilming, magnetic separation methods cannot achieve the ideal beneficiation effect, the flotation method can be considered to remove the mica and feldspar from quartz ore.

&#; Mica removal: the cationic collector is used under the condition of pH value 3-4.

&#; Feldspar removal: In acidic conditions, fluorine flotation and fluorine-free flotation are used according to the different flotation reagents. The fluorine flotation means using the cationic collector to preferentially float feldspar under the activation of strong acid and fluorine ions. The fluorine-free flotation means to adopt the anionic collector dodecyl sulfonate and diamine cationic collector together, then the anionic collector complexes with the diamine collector adsorbed on the feldspar surface to form co-adsorption and improve the hydrophobicity of feldspar surface.

Application:

Mainly used to remove feldspar, mica, and various non-magnetic associated impurities in the quartz sand.

Quartz Sand Processing Equipment required:

Suction mechanical agitation flotation machine (SF flotation machine, BF flotation machine, JJF flotation machine), inflation mechanical agitation flotation machine (KYF flotation machine, XCF flotation machine)

04

Quartz Sand Processing Acid pickling method

The quartz isn&#;t insoluble in acid (except HF), while the acid solution can dissolve other impurities. Therefore, the acid pickling method can be used in quartz beneficiation.

The commonly used acids in quartz sand pickling include sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc. Dilute acid has a good effect on removing iron, aluminum, and magnesium, while the concentrated sulfuric acid and hydrofluoric acid have a good effect on removing titanium and chromium. According to the production practice, the mixed acid has a better effect on quartz sand beneficiation and purification.

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Application:

Quartz sand contains iron, aluminum, magnesium, titanium, chromium, and other impurities, and the requirements on the purity of quartz sand are high.

Quartz Sand Processing Equipment required:

Leaching agitation tank

In the actual beneficiation process, the quartz sand beneficiation processing often needs to be determined comprehensively according to the ore properties, concentrator conditions, investment budget, and other factors. It is suggested to carry out the mineral processing test, then select the single or combined process through the beneficiation test report, striving for the ideal technical and economic benefits.

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01

Selective grinding and screening of quartz sand

Selective grinding is a technique to separate quartz sand and associated minerals by utilizing the hardness differences of different minerals. Silica minerals are mainly composed of quartz sand, which has a hardness of about 7, while associated minerals such as mica and feldspar have different hardnesses. Through grinding, associated minerals with lower hardness, such as mica, can be ground into fine particles, while the particle size of quartz particles remains relatively unchanged, so that quartz can be separated by screening.

In selective grinding, feldspar has a hardness close to that of quartz (about 6), so it is difficult to remove effectively by this method. However, mica has a lower hardness (about 2~3) and can be removed efficiently by selective grinding. This process can be done by dry or wet grinding, where dry grinding often uses air-fall autogenous mills, hammer mills and other equipment, while wet grinding uses autogenous mills, ore washers, ball mills and other equipment.

02

Quartz sand magnetic separation

Magnetic separation is the process of removing impurities through the magnetic difference of minerals in an uneven magnetic field, and is particularly suitable for removing iron impurities. Magnetic separation can not only effectively remove strongly magnetic minerals (such as iron-containing minerals), but also some weakly magnetic minerals, such as mica, chlorite, rutile, etc. Through multiple magnetic separation treatments, the iron content in the ore can be gradually reduced to achieve the purpose of refining quartz sand.

Generally speaking, when the magnetic field strength is set to ~KA/m, the magnetic separation effect is best. It should be noted that as the magnetic field strength increases, the iron removal rate will tend to stabilize after reaching a certain level, and the effect of increasing the magnetic field strength is limited at this time.

03

Quartz sand pickling

Pickling is an indispensable step in the quartz sand purification process. Since quartz is difficult to dissolve in most acid solutions (except hydrofluoric acid), other impurity minerals can be dissolved by acid, thus achieving the purification of silica raw materials. Pickling can not only remove impurities such as spots and inclusions attached to the surface of quartz, but also effectively remove non-metallic minerals such as iron and chromium.

Pickling is generally divided into dynamic pickling and static pickling, and the acids used include hydrochloric acid, nitric acid, sulfuric acid and hydrofluoric acid. The choice of different acids depends on the type of impurity minerals. For example, dilute hydrochloric acid and dilute sulfuric acid are best for removing iron-containing impurities, while hydrofluoric acid is most effective for removing chromium-containing minerals. During the pickling process, the concentration of the acid, soaking time, temperature and stirring intensity will affect the final purification effect.

It should be noted that there are environmental risks in the pickling process, especially hydrofluoric acid, so high-concentration hydrofluoric acid is usually avoided. In addition, the waste acid after pickling needs to undergo strict wastewater treatment before it can be discharged to reduce harm to the environment.

04

Quartz sand flotation

Flotation is another common method for quartz purification, which achieves separation through differences in mineral density and surface wettability. Flotation can effectively remove most of the associated minerals except quartz and achieve quartz enrichment. Depending on the flotation medium, flotation can be divided into two types: froth flotation and full oil flotation.

- Froth flotation mainly separates the associated minerals by introducing bubbles into the slurry, and the associated minerals adhere to the bubbles and float out of the slurry.

- Full oil flotation uses the difference in hydrophobicity of the mineral surface to use oil to adhere and separate the impurity minerals.

05

Quartz sand combined separation process

Due to the complex composition of silica minerals, the diversity of associated minerals, and the different natural conditions of silica mines in different regions, a single beneficiation technology usually cannot achieve the ideal purification effect. Therefore, the combined process becomes the key to purifying quartz. Common quartz sand beneficiation processes include screening, crushing, magnetic separation, acid washing, flotation and other process combinations to maximize the removal of associated minerals and impurities.

Quartz sand beneficiation technology includes a variety of complex processes and technologies, such as selective grinding, magnetic separation, pickling and flotation. The combined application of these technologies can effectively remove impurities in the silica raw materials and ultimately achieve efficient enrichment of quartz. The selection and combination of different processes depends on the specific properties and purification requirements of the silica ore, and the efficiency and purity of quartz sand beneficiation can be further improved by continuously optimizing the process parameters.

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