The silica sand purification process is generally performed by scrubbing mud, magnetic separation, chute reselection, flotation, pickling, or a combination of several methods to remove mineral impurities in the quartz sand, and obtain high-purity quartz sand with particle size and impurity content meeting the requirements.
1. Scrubbing mud method
The mechanical force of the scrubber and the grinding force between the sand particles are used to remove the film iron, adhesion, and muddy impurities on the surface of the quartz sand. Then the silica sand is further purified through classification operations.
Required equipment: attrition scrubber
2. Magnetic separation
Magnetic separation is one of the most effective methods to remove iron-containing impurities in raw materials. Since the minerals such as hematite, limonite, and biotite contained in the raw materials have weak magnetic properties, they can be selected by a wet strong magnetic separator. For strong magnetic minerals dominated by magnetite, weak magnetic separators or medium magnetic separators are used for separation.
Required equipment: magnetic separator
3. Spiral chute gravity separation
When the raw material contains a small number of heavy mineral impurities, it can be effectively removed by the spiral chute gravity separation method. Because it has no magnetism and its specific gravity is heavier than quartz. When the raw mortar rotates and slides along the surface of the spiral chute, various minerals will separate under the dual action of gravity and centrifugal force according to the different specific gravity. The greater the difference in mineral specific gravity, the higher the degree of separation.
Required equipment: spiral chute
If there are many types of mica minerals in the raw materials, and a certain amount of feldspar minerals with a specific gravity similar to that of quartz, the flotation process can be used to remove these impurity minerals. A three-stage flotation process is used to remove mica minerals and feldspar minerals in the quartz sand. In a neutral or weakly acidic environment, adopt the corresponding pharmaceutical system. The first stage is mainly to floated iron-containing mud from the slurry. In the second stage, mica minerals and conjoined bodies of mica and quartz are floated from the slurry. The third stage is the flotation of feldspar minerals and conjoined bodies of feldspar and quartz from the slurry.
Required equipment: Flotation machine
If the finished sand is reddish, which proves that the iron and titanium content is high, the pickling method can be used at this time. First wash with water to remove powder and impurities, then pickle and soak in water, and finally dry.
The above is the silica sand purification and manufacturing process and required equipment. Impurity removal is carried out in a state where the impurity minerals and quartz mineral monomers are dissociated, and almost all impurity minerals in the raw materials are removed. The purity of quartz sand is greatly improved to obtain silica sand concentrate.
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