There just are no miracles in the world is prepared for a man!For example, an amazing sight - the sand is white.From a distance and did not understand at once: whether it drifts in the middle of summer, or the mountain of sugar, and may be salt or other chemicals?And only near, taking his hand and spilling through his fingers, you know, it's white sand, which is a picture in this article.And it consists of quartz - a mineral common on Earth.Quartz is included in the mineral composition and oligomictic polymictic sands composing dunes desert dunes coast, shallow water bodies.
natural white sand
quartz sand deposits are found in the river valleys.The sand is white purest river, usually it does not contain pollutants, as well as mining silica sand, weathered vein outcrops.It is likely to meet in deposits of natural quartz sand nuggets of precious metals or minerals.Sometimes white sand buried under layers of sediment and other mined pit method.It usually contains pollutants in the form of impurities clay, sandy loam, loam, sand polymictic that occur in the interior of quartz sand in the form of layers and lenses.
creations of nature and human hands
white sand, consisting of 90-95% quartz, is not as common and highly valued as a raw material for many industries.The lack of natural sand can be filled - an artificial quartz sand using a crushing and screening equipment.For the production of sand used monolithic blocks of milky white quartz, crushing and sifting that break the rock, get the sand with specific and correct size (fraction) of particles.From natural sand is extremely artificial monomineral, sharp-angled grains.
Where applicable quartz sand
white sand is used for the manufacture of glass.To it such demands: 95% of it is composed of quartz should be medium-(0.25-0.5 mm diameter grains) without impurity substances difficultly soluble in the glass mass, without harmful impurity minerals containing iron, chromium, titanium(they are stained glass and increase its light absorption).A good glass sand is one that is composed by 98.5% of silica and iron oxide comprises no more than 0.1%.Quartz glass is necessary for the manufacture of chemical glassware, instrument - it can withstand large temperature changes.For molds and cores in foundry of ferrous and nonferrous metals are used as silica sand, known as molding in metallurgy.The quality of this sand determine its particle size distribution and particle shape, affecting the gas permeability, and the amount of impurities that reduce the refractoriness of the sand.It is necessary that the sands were not minerals with a high content of sulfur and phosphorus, which are harmful to the metal casting.Apply quartz sand for the production of grinding wheels and "nazhdachki" - for this sand is melted with graphite and silicon carbide is obtained, second in hardness only to diamond.Exceptional dirt-holding capacity (sorption capacity) of silica sand used in filters for water purification from iron and manganese oxides.This sand is used in the construction of surfaces for plastering and finishing for the production of panels, concrete blocks.Use in landscape design.Even coffee, heated in steam table filled with white quartz sand, fragrant taste delight.
