Because of the differences in the content, types, occurrence of impurities of silica quartz sand, and requirements of product quality, the single beneficiation method may not be able to produce high-purity quartz products, so we normally process silica quartz by combined beneficiation processes.
The common silica quartz sand beneficiation and purification processes are as follows:
In the process of weathering and sedimentary mineralization, a large number of clay minerals and ferruginous will form cement or adhesion minerals on the surface of quartz sand. The scrubbing-classifying-desliming process can be adopted to remove them. The process is generally used as a pretreatment process before the raw ore is fed into separation flow and the process is effective on the removal of argillaceous impurities contained in silica quartz sand.
When the main impurities contained in silica quartz sand are weak magnetic minerals such as limonite, tourmaline, hematite, and biotite, and strong magnetic minerals such as magnetite, Xinhai recommends the scrubbing-desliming-magnetic separation process. In actual production, a wet high-intensity magnetic separator is used to separate weak magnetic impurities with almost 13000Oe magnetic fields.
Most of the low occurrence particle impurities that include monomers and aggregates can be removed by the scrubbing-magnetic separation-flotation combined processes and the purity of silica can generally reach 99.5%-99.9%, which can be used by most of the industries.
However, if it is required to be further used as ultra-high purity quartz, it is necessary to treat the impurities attached on the surface of the quartz particles in the form of spots and inclusions by the acid leaching process.
According to the requirements of different industrial uses for impurity minerals (Fe, Al, Ti, Cr ) contained in silica quartz sand, you need to carry out mixed acid leaching treatment with different concentrations and proportions. After the grinding-scrubbing-desliming-magnetic separation-flotation-acid leaching process, high purity quartz with a silica content of 99.99% or more can be obtained.
Xinhai improves the efficiency of the scrubbing washer machine by optimizing the structure and technical parameters, which can add agents while operating and remove 80% of iron and aluminum ore.
Compared with other processes, this process not only obtains refined quartz sand with higher purity but also avoids the secondary iron contamination and low yield caused by the grinding and scrubbing process. The components of refined silica quartz sand are as follows: the content of silicon dioxide is ≥99.8%, the content of iron trioxide is ≤0.023%, the content of aluminum oxide is ≤0.05%, and the content of titanium dioxide is ≤0.02%. This kind of quartz sand already meets the requirements of first-class optical glass sand, and the yield of refined quartz sand is as high as 73%.
You can also obtain high-purity quartz by further processing flow: flotation-acid leaching.
These are common quartz sand beneficiation and purification processes. Contact our expert to get your customized silica quartz sand beneficiation process flow.
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