1. Washing-classifying-desilting: In 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.
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2. Scrubbing: The effect of water-washing-grading desilting is poor for the thin film iron and adhesion impurities on the surface of quartz sand. 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 separation: It screens 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 separation: It separates the quartz sand&#;s magnetic impurity minerals and particles. A strong magnetic separator to separate the impurity iron in quartz is the key link. Magnetic separation can remove mechanical iron minerals (hematite, limonite, pyrite, ilmenite, biotite, etc.) mixed in quartz sand. It can also remove weak magnetic minerals and inclusions and disseminate impurities containing iron minerals.
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5. Flotation: Flotation machine 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.
6. Dewatering: The material is dehydrated and dried to obtain the required products, and the actual configuration should be adjusted according to the production needs.
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. Contact us to get process details and equipment factory price!
The processing technology of high purity quartz sand washing plant usually includes complex processes such as calcination, water quenching, classification, magnetic separation, flotation, acid leaching, cleaning and chlorination roasting.
Compared with general mineral processing engineering, high purity quartz sand processing equipment has the following characteristics:
1.The purity of reagents used in high purity quartz sand processing is high
Acid leaching and water washing is an important part of high purity quartz sand processing technology. Because high purity quartz requires high purity of SO2 and low content of impurity elements, the purity of reagents such as acid and water must meet the corresponding require
2.The reagents used in the processing of high purity quartz sand are highly corrosive
Hot acid leaching plays a key role in the purification and processing of high purity quartz. One of the important chemical properties of quartz is its excellent acid resistance (except HF), while other metal impurities in the ore are generally poor in acid resistance. Under certain temperature, this effect is more obvious.
The acid leaching process used in the high purity quartz processing is precisely using this principle to realize chemical purification. The results show that the metal minerals, iron bearing minerals, carbonate minerals and thin film iron between quartz particles can be removed by using the appropriate acid formula according to the characteristics of mineral raw materials.
If a certain amount of HF acid is added in the acid formula, it has a good effect on removing trace mica and feldspar in raw materials. Therefore, hot acid and HF acid and other strong corrosion reagents are often used.
3.The standard of raw materials used in high purity quartz sand processing is strict
It has been proved that in the purification process of high purity quartz, the materials such as containers that contact with raw materials have a significant impact on the quality of samples. Strictly controlling the material standard of each processing link of high purity quartz sand is the key to ensure the quality.
4.High purity quartz sand processing environment is demanding
The purity of SO 2 in high purity quartz determines that there should be no pollution in the production process. Due to the long processing flow and complex process of high purity quartz sand, it is difficult to realize full sealing in the production process.
In order to prevent dust pollution in the air, there must be strict requirements for air environment such as production, packaging and storage.
5. High purity quartz sand processing safety requirements
The high purity sand washing production line composed of corrosive reagent, toxic gas (if chlorination roasting) and high temperature must have higher production safety guarantee.
The particularity of the above process conditions determines the high requirements of high purity quartz processing and production equipment, and the development of safe, environmental protection, energy saving and efficient production equipment is the key condition for the realization of large-scale and industrialization.
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