Purification Process As the grade of industrial quartz sand raw materials continues to decline, it becomes necessary to enhance its quality through a series of purification processes to meet industrial requirements. The following are the main methods used in the purification of quartz sand: 1. Desliming Desliming is a process that removes thin layers of iron, clay, and other impurities from the surface of quartz sand grains using mechanical forces and the friction between particles. This process also helps break apart unattached mineral aggregates, leading to further purification through classification. Common techniques include stick scrubbing and mechanical scrubbing. Key factors influencing the effectiveness of scrubbing include the design and configuration of the scrubber, while secondary factors include scrubbing time and concentration (typically ranging from 50% to 60%). 2. Magnetic Separation Magnetic separation is widely used to remove magnetic minerals such as hematite, limonite, and biotite from quartz sand. Strong magnetic separators can effectively remove weakly magnetic minerals, while ferromagnetic minerals like magnetite can be removed using a low-intensity magnetic separator. 3. Flotation Flotation is employed to eliminate non-magnetic impurities such as feldspar and mica that cannot be removed through magnetic separation. This method significantly improves the purity of the final product by selectively separating these unwanted minerals. 4. Acid Leaching Acid leaching is a chemical process where quartz remains largely unaffected by most acids, except for hydrofluoric acid. Other impurities, such as metal oxides, can be dissolved by the acid, resulting in a higher level of purification. This technique is particularly effective for removing trace metals and enhancing the overall quality of the quartz sand. 5. Bioleaching Bioleaching involves the use of microorganisms to extract thin-film iron or adsorbed iron from the surface of quartz sand particles. This is an emerging and environmentally friendly method for iron removal, offering a sustainable alternative to traditional chemical treatments. Production Process 1. Large stones are stored in the warehouse. 2. Coarse crushing is performed. 3. Fine crushing follows to reduce the size further. 4. A vibrating screen separates the sand based on particle size. 5. A sand washing machine cleans the sand and removes remaining impurities. 6. The washed sand is then dried either naturally or using a dryer to achieve the desired moisture content. Steel Structure Livestock Shed
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