Quartz brief introduction
Quartz, inorganic minerals, the main component is silicon dioxide, and often contain small amounts of impurities such as Al2O3,, CaO, MgO, etc., is translucent or opaque crystals, generally white, hard texture.Generalized include a high-temperature quartz quartz (b-quartz).Quartz block, also known as silica, is the production of quartz sand (also known as silica sand) of raw materials, but also quartz refractories and firing ferrosilicon raw materials.Quartz sand is an important industrial mineral raw materials, widely used in glass, foundry, ceramics and refractories, metallurgy, construction, chemicals, plastics, rubber, abrasive and other industries.
Classification and Application
Quartz sand filter material as the application of quartz sand is combined with the filter container for trapping suspended solids in water colloidal particles of impurities, which act as a filter.Can be divided into the following categories:
Ordinary Quartz Sand:
Mainly used in sewage treatment, three to five years with no problem, as long as the line to prevent the loss of quartz sand, is polluted does not matter, because the sewage treatment, sludge can be aerobic or anaerobic respiration, the degradation of pollutants in sewage.
Refined Quartz Sand:
Used in water treatment, in the sand filter, generally two to three years to be replaced, usually the pollutant wrap quartz sand filter can no longer play a good role, and only can be replaced.Quartz sand through so9001-2000 quality system certification.
Quartz sand purification method
Currently the main method of purifying quartz sand can be divided into two kinds of physical and chemical methods.
Physical methods are mainly off the mud washing and grading, scrub, magnetic separation, flotation and ultrasonic method.
Magnetic separation can maximize the removal of quartz sand grains contains some impurities, hematite, limonite and biotite weak magnetic impurities mainly dominated by magnetite minerals and strong magnetic minerals.For weakly magnetic impurity minerals often used in 100000e above magnetic machine, for strong magnetic impurity minerals often used in weak magnetic drive or magnetic separator machine.In general, the frequency and magnetic field strength on the magnetic effect of removing iron have a major impact, with the increase in the number of magnetic iron content decreased; while in certain magnetic field strengths can remove most of the iron, but then magnetic field strength even improve a lot, in addition to iron and there was no much change.
Flotation of quartz sand to remove feldspar, mica and other non-magnetic associated mineral impurities.Currently there are fluorine and fluorine-free flotation flotation two methods.Fluorine flotation collector and a cationic activator hydrofluoric acid pH range of.But considering wastewater containing fluoride serious impact on the environment, people began to turn to freon flotation.
Chemical methods are mainly acid leaching and complexation, acid leaching method is the use of quartz insoluble acid (HF except), other impurities dissolved mineral acid can be characterized, which can achieve the quartz further purification.Complexation is the use of quartz powder by acid leaching, the acid can impurity ions in solution to form complex compounds in the solution to further remove impurity ions.
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