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Mineral Quartz introduction


Mineral Quartz introduction

Quartz , chemical formula is SiO2, inorganic mineral, the main component is silica, often contains a small amount of impurities such as Al2O3, CaO, MgO and so on, for the translucent or opaque crystal, generally milk white, hard texture. Quartz is a mineral resource with very stable physical and chemical properties. The crystal belongs to the oxide mineral of the three - square crystal system, that is, low temperature quartz (a- quartz). It is the most widely distributed mineral species in the quartz. The generalized quartz also includes high temperature quartz (b- quartz). Quartz block, also known as silica, mainly produces quartz sand (also known as silica sand) raw materials, but also quartz refractories and fired ferrosilicon raw materials.

Quartz is also the general name of crystal, because it can be used as a mineral of crystal, all of which are produced by quartz cutting, all of which are identified by the same composition. It is different that crystal can be used as a gem material, and after the quartz is dyed, most can only be used as a jade imitation, for example, Xiuyan Jade, Dushan jade and so on. . Quartz and common sand and crystal are the substances that "go with the womb". When silicon dioxide crystal is perfect, it is crystal; the SiO2 is gelatinized after dehydration is agate; the silica gel becomes opal; when the grain of silica is less than a few microns, it consists of the chalcedony, flint, and secondary quartzite. The rose quartz is a non plastic material. The mullite crystals produced in the high temperature with clay give China high mechanical strength and chemical stability, and can increase the semitransparency of the body. It is a good raw material for the preparation of white glaze. Vein quartz, quartz sand, quartzite, sandstone, silica, opal, diatomite and so on are used as raw materials for daily ceramics. Rice shell ash is also rich in SiO2.

During the Republic of China, quartz was used in the lower Sanbao village, Jingdezhen. After the founding of new China, quartz was used mostly in Xingzi, Duchang and Xiushui, especially after 2000. The amount of glaze is 10%~30%. Before use, wash and pick, remove impurities and put them in high temperature calcination in the kiln for grinding.

Variety of colorless, transparent quartz, called Krystallos by the Greeks, means "white ice" and they are convinced that quartz is durable and strong ice. Ancient Chinese believed that cold crystals in their mouths could quench thirst.

Main types

Quartz can be classified into ordinary quartz sand, refined quartz sand, high purity quartz sand, fused silica sand and silicon powder according to its quality.

1. Common quartz sand:

SiO2 is more than 90-99%, FeO is less than 0.06-0.02%, the refractoriness is 1750-1800 degrees, the appearance is large, and the surface has a yellow skin cyst. The size range is 5-220 mesh, and it can be produced according to the user requirements. Main Applications: Metallurgy, Ink Silicon Carbide, Glass and Glass Products, Enamel, Cast Steel, Water Filtration, Foaming Alkali, Chemical, Sandblasting and other industries.

2, refined quartz sand:

SiO2 is more than 99~99.5%, Fe2O3 is less than 0.02~0.015%, and high quality ores are selected for complex processing. The size range is 5~480 mesh and can be produced according to user's requirements. The appearance is white or crystalline. Main applications: high-grade glass, glass products, refractory materials, smelting stone, precision casting, grinding wheel material, etc.

3. High purity quartz sand:

SiO2 (> 99.5-99.9%) and FeO (> 0.005%) are made of 1-3 grade natural crystal stone and high quality natural stone by careful selection and fine processing. The grain size ranges from 1-0.5mm, 0.5-0.1mm, 0.1-0.01mm and 0.01-0.005mm.

4. Fused silica sand

Chemical components: SiO2:99.9-99.99%; Fe2O3:10PPM-25PPM; Max Li2O content: 1-2PPM; Max Al2O3 content: 20-30PPM; Max K2O content: 20-25PPM; Max content:. Physical properties: the appearance is colorless, transparent block, granule or white powder. True density: 2.21; Mohs hardness: 7; pH: 6

5, silicon micro powder

Silicon micro powder: the appearance is gray or gray white powder. The refractoriness is >1600 C. Bulk density: 200~250 kilograms per cubic meter.

Function of use

Quartz is one of the most widely distributed minerals on the earth's surface, and its uses are quite extensive. Far from the stone age, people used it to make simple tools such as stone axes and stone arrows to hunt food and fight against the enemy. Quartz clocks and electronic equipment are used as the standard frequency of piezoelectric quartz; the glass made after melting can be used for making optical instruments, glasses, glass tubes and other products; it can also be used as a bearing, grinding material, glass ceramics and other industrial raw materials for precision instruments.

Quartz sand is an important industrial mineral raw material, widely used in glass, casting, ceramics and refractory materials, metallurgy, construction, chemical industry, plastics, rubber, abrasive and other industries.

In addition, when the quartz crystal contains tiny bubbles or liquids to fill the cracks, it will produce a rainbow by interfering light, which can be made into exquisite jewelry. Napoleon's wife, Empress Josephine, has a dazzling collection of gems, ornaments made of rainbow quartz.

Quartz contains various impurities and has different colors.

1, crystal (rock crystal): colorless and transparent

2, Amethyst (Amethyst): Purple transparent or translucent, heating can decolorization.

3, Rose Quartz (rose quartz): Light Rose, compact and translucent.

4, smoky quartz (smoky quartz): color or brown and transparent. The reason is that Si is replaced by Al under the action of radiation. It is caused by the loss of paramagnetic centers in tetrahedron. The color deepens and becomes black quartz.

5, Huang Shuijing (Citrine): gold or lemon yellow.

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