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Click to add WeChatQuartz sand is also called silica sand/silica. This type of mineral is generally accompanied by various impurity minerals such as feldspar, mica, clay and iron. If you want to obtain high-purity quartz sand for industrial applications, you need to use mineral processing methods for purification. Depending on the types of other associated minerals contained in the quartz sand, the mineral processing and purification methods are also different. Currently, the common quartz sand purification processes are:Scrubbing purification, Magnetic separation purification, Flotation purification and Acid leaching purification are four methods. The editor below will explain them one by one. Introduce these four purification methods.
The mud impurities in silica minerals can be effectively removed through classification operations. The main scrubbing methods include mechanical scrubbing, rod friction scrubbing, dosing, high-efficiency and powerful scrubbing, and ultrasonic scrubbing.
Mechanical scrubbing: Mechanical scrubbing to remove iron is a process that uses equipment, with the help of external force and friction and collision between silica ore particles, to remove thin films of iron and other impurity minerals on the surface of the ore particles. Research shows that when the concentration of silica scrubbing slurry is between 50-60%, ideal purification effects can be achieved.
Rod friction scrubbing:This process can enhance the scrubbing effect while changing the particle size of silica minerals, providing a mineralogical basis for further silica selection. The factors that affect the scrubbing effect of rod friction include silica slurry concentration, scrubbing time, rod amount and rod ratio. The rod friction scrubbing process is selective. After scrubbing, the particle size of the mineral products is relatively uniform and there is less over-crushing.
Medicated high-efficiency and powerful scrubbing: Medicine is used to increase the electrical repulsion on the surface of silica and impurity mineral particles, thereby enhancing the separation effect between mineral particles.
Ultrasonic scrubbing: The secondary iron film is the main reason why the iron content of silica sand is too high and difficult to purify. This process can remove the secondary iron film on the surface of silica mineral particles, and use the action of ultrasonic waves to remove impurity minerals adhering to the surface of silica particles to achieve impurity removal and purification.
Magnetic separation and purification of silica can effectively remove magnetic minerals including conjoints, such as hematite, Limonite, biotite, ilmenite, pyrite and garnet can also remove mineral particles wrapped in magnetic minerals. Magnetic separation and purification can be classified into two categories: dry type and wet type.
Dry magnetic separation to purify quartz sand: As the magnetic field intensity increases, the impurity removal rate increases. Tests have proven that when the magnetic field intensity is controlled at 10000Oe, the SiO2 obtained is ≥99%. Fe2O3 content ≤0.07%.
The effect of magnetic separation to remove iron and purify silica is directly related to the number of magnetic separations and the strength of the magnetic field. The more times of magnetic separation, the lower the iron content in the concentrate. , most iron-containing impurities can be removed under a specific magnetic field intensity, but increasing the magnetic field intensity has little effect on the iron removal rate. In addition, the finer the silica particles, the better the iron removal effect.
In order to further remove impurities and improve the purity of silica, flotation is usually used for purification. Flotation purification of silica is mainly used to remove non-magnetic associated minerals such as feldspar and mica from the ore.
Silica and feldspar have similarities in physical properties, structural structure and chemical components, and they can be effectively separated through flotation. . Conventional flotation processes are divided into three categories: "fluorine and acid", "fluorine-free and acid" and "fluorine-free and acid-free".
Fluorine and acid: Use hydrofluoric acid activator and cationic collector to perform silica-feldspar flotation separation in an acidic pH environment. The flotation effect is Good, easy to control, and stable indicators.
Fluorine-free and acid-free: It avoids the damage of fluoride ions to the environment, but the strong acid liquid in the flotation process will corrode the mineral processing equipment to a certain extent.
Fluorine-free and acid-free: Under natural pH conditions, through reasonable deployment, anions and cations are used as collectors to prioritize the flotation of impurity minerals.
The basic charge mechanism of mica is the same as that of feldspar. Therefore, during the process of feldspar impurity removal by silica, a large amount of mica ore will accompany the feldspar at the same time. Flotation removed. E-8 collector can also be used to use the mica lattice charge characteristics for flotation. In the slurry with a pH value of 2-3, silica silica hardly floats, thereby flotating mica impurities.
Acid leaching purification utilizes the principle that quartz is insoluble in acid (except HF) and impurity minerals can be dissolved by acid to achieve further silica purification. propose. Commonly used acid solvents include HCI, HNO3, H2SO4, HFF, etc. The reducing agent can be sulfurous acid and its salts.
For different metal impurities, the types and concentrations of applicable acids vary. It is generally believed that various dilute acids have significant effects on the removal of iron, aluminum, and magnesium; thicker H2SO4, aqua regia or HF acid can remove titanium and chromium; iron and titanium on the surface of silica particles can obtain better results through HF. The purification effect of acid leaching is related to mineral components, acid concentration, soaking time, temperature, mineral particle size, etc. Different acids should be used for purification operations according to actual conditions.
The above is an introduction to four common quartz sand purification processes. In actual mineral processing plants, the mineral types and compositions contained in each quartz sand mine are different. In addition, the application environment of quartz sand has different requirements for it. Purification requirements are also different. Therefore, during mineral processing, mineral processing tests and analysis should be conducted based on actual needs and ore characteristics, and suitable quartz sand purification processes and construction plans should be designed through analysis.
Xinhai Mining has a Mineral Processing Research Institute, a Mineral Processing Design Institute and a Mechanical Research Institute, which can design purification process plans for various types of quartz sand, and customize complete sets of quartz sand mineral processing equipment, if necessary. ,Welcome to consult.
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