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7 methods and equipment for removing iron from quartz sand | fote machinery

The purification of quartz sand is very difficult, mainly because it contains some impurity minerals, some of which containing iron elements, such as goethite, hematite, limonite, ilmenite, pyrrhotite, tourmaline, amphibole, biotite and so on.

These impurities greatly reduced the use-value of quartz sand, so the removal of iron from quartz sand is very important. The following introduces 7 methods and equipment for removing iron from quartz sand.

Gravity separation can usually be used effectively for the entire particle size range of quartz sand. When the iron in quartz sand is mainly in the form of heavy minerals (relative density > 2.9), gravity selection should be considered firstly. But gravity separation is difficult for mixed particles, flaky particles, light mineral particles and medium-density minerals.

Spiral chute gravity separation can be used when the material contains a particularly small amount of heavy mineral impurities (such as zircon). The greater the specific gravity difference of minerals, the higher the degree of separation.

When the spiral chute is used for beneficiation, the quartz mortar can be divided into three parts: granular heavy mineral area, granular quartz sand area, flaky and light quartz sand area. In this way, not only the heavy minerals in quartz sand can be removed by the spiral chute, but the mica minerals can also be removed partially.

Quartz, the main mineral in quartz sand, is a diamagnetic substance that cannot be magnetized in a magnetic field. The iron-containing impurity minerals in quartz sand, such as hematite, limonite, magnetite, goethite, etc., are mostly magnetic.

The quartz sand flotation method mainly removes iron-containing mineral impurities such as mica, feldspar, garnet and amphibole. A three-stage flotation process is used to remove iron-containing argillaceous, mica and feldspar minerals from quartz sand respectively.

If the finished quartz sand is reddish, and the iron and titanium content does not meet the product quality requirements, the acid leaching method can be used. Wash the quartz sand with water to remove powder and impurities, then carry out acid leaching before drying it.

Quartz sand acid leaching method (chemical treatment) has good iron removal effect, but the cost is higher, the technical requirements are stricter, and it is harmful to the environment. However, in order to obtain higher purity quartz sand, this chemical method will inevitably be used in the future.

Stirring and scrubbing are accomplished by friction between particles caused by violent agitation of the blades. However, since iron oxide films are thin and strong, this method is unlikely to remove them. If necessary, chemical reagents can be added.

Ultrasonic iron removal is mainly to remove the secondary iron film on the surface of the particles. When treated with ultrasonic technology for 10 min, its iron removal rate can generally reach 46% to 70%. In order to improve the effect of ultrasonic cleaning, a small number of reagents (such as sodium carbonate) and surfactants (such as water glass) can be added.

Ultrasonic iron removal is currently relatively expensive for the beneficiation of quartz sand, and it is still difficult to apply in large-scale concentrators, but for those who require high purity, low production is possible.

Microbial leaching of thin-film iron or immersion iron on the surface of quartz sand particles is a new technology for iron removal, which is currently in the research stage of laboratory and small-scale experiments.

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In the mining industry, ore beneficiation is that process which extracts valuable substances from ores. Beneficiation methods include gravity separation, flotation, chemical separation, magnetic separation and so on. The use of some specific beneficiation method depends on which kind of the ore is. Here are four examples introducing different beneficiation processes for reference.

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High-purity quartz is the raw material of high-end quartz products and the material basis of high-end products in the silicon industry. It is widely used in photovoltaics, electronic information, optical communications and electric light sources. It has an important position and role in strategic emerging industries of new materials and new energy.

There are only a few raw ores in the world that can produce high-purity quartz sand for high-tech industries. There are many types of silica resources and large storage capacity. Quartzite, quartz sandstone and vein quartz are the main raw materials for producing high-purity quartz sand.(1) QuartziteQuartzite is a metamorphic rock dominated by quartz. It is formed by the metamorphism of quartz sandstone and siliceous rock, where the silica content is above 85%.(2) Quartz sandstoneQuartz sandstone is a sedimentary rock formed by cementing quartz particles, and its silica content is as high as 95%.(3) Vein quartzVein quartz is formed by filling silicon thermal fluid secreted by underground magma into rock fissures, and its silica content is as high as 99%.

1. Washing-classifying-desiltingIn the quartz sand beneficiation process, the fine-grained grade with a particle size of less than 0.1 mm is usually called slime. For quartz sand with a large amount of clay and ore mud, as the particle size becomes finer, the grade of silica gradually decreases, while impurities such as iron and aluminum rise instead. Using water washing-classifying-desilting method can effectively improve quartz grade.2. ScrubFor the thin film iron and adhesion impurities on the surface of quartz sand, the effect of water washing-grading desilting is poor. This requires the removal of the thin film iron and adhesion impurities suitable for the sand surface by means of mechanical force and the abrasive force between the sand particles. After the grading desilting, a better impurity removal effect can be achieved.3. Gravity separationgravity separation is to screen minerals according to their different gravity. Due to the difference in density, the mineral particles are affected by the fluid force and mechanical force in the medium, resulting in loose stratification, so that the ore particles are separated.4. Magnetic separationMagnetic separation is to separate the magnetic impurity minerals and particles in the quartz sand. The quartz in the quartz sand is a diamagnetic substance, which cannot be magnetized in the magnetic field, and most of the impurities containing Fe and Ti are paramagnetic substances, which can be magnetized, so that the impurities containing Fe and Ti can be removed by magnetic separation High quartz sand content.5. FlotationFlotation is the process of separating mineral particles by different physical and chemical properties on the surface of the mineral particles. The main function is to remove the related mineral mica and feldspar from the quartz sand.The physical beneficiation method can only remove the impurities of mineral structure, and rarely remove the impurities on the surface of quartz sand. The purer the quartz sand, the higher the use value, so it is necessary to further purify the quartz sand after flotation.

The chemical methods for purifying quartz sand are mainly acid leaching or alkali leaching. Compared with physical methods, the cost of chemical methods is higher, but the purification effect is better, especially when the purity of quartz sand is high, chemical purification is more effective.The acids commonly used in acid leaching are sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc. Dilute acid has a good effect of removing impurities such as iron, aluminum, and magnesium, while concentrated sulfuric acid and hydrofluoric acid have a good effect of removing impurities of titanium and chromium. Therefore, in the actual beneficiation, mixing acid to purify quartz sand is the best.Compared with general mineral processing engineering, high-purity quartz sand processing technology has the following characteristics:(1) The reagent purity is high. Acid leaching and water washing are important steps in the processing of high-purity quartz sand. Due to the high purity requirements of high-purity quartz and the low content of impurity elements, the purity of the reagents such as acid and water must meet the corresponding requirements, otherwise it is difficult to produce qualified products.(2) The reagent has strong corrosion. Hot acid leaching plays a key role in the purification of high-purity quartz. An important chemical property of quartz is excellent acid corrosion resistance, while other metal impurity components in the ore are generally poor in acid corrosion resistance. Under certain temperature conditions, this effect is more obvious. The acid leaching process used in high-purity quartz processing uses this principle to achieve chemical purification.(3) The material standards are strict. Practice has proved that in the purification of high-purity quartz, materials such as containers that come into contact with the raw materials have a significant impact on the quality of the sample. Strictly controlling the material standards of each processing link of high-purity quartz sand is the key to ensuring quality.

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