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Address: C / O Shri Sahajanand Minerals Pvt Ltd. Shri Swaminarayan Vanijya Sankul, Above Bank Of India, Second Floor, Hospital Road, Bhuj, Kutch, Gujarat., Bhuj, Gujarat, India, 370001
Country: [India]
Phone: - - 91-9429-341536
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Fax: - - 91-2832-230670
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Potash Feldspar

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Keywords Other Non-Metallic Minerals & Products, Potash Feldspar, , resourcesofearth, India
Category Minerals & Metallurgy > Other Non-Metallic Minerals & Products 
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Feldspar is by far the most abundant group of minerals in the earth's crust. The feldspar group is a fairly large group with nearly 20 members recognized, but only nine are well known and common. Those few, however, make up the 60% percentage of minerals found in the Earth's crust. The following are some of the more common feldspar minerals: The plagioclase feldspars:Albite, (Sodium aluminum silicate) (NaAlSi3O8) Oligoclase, (Sodium calcium aluminum silicate) Andesine, (Sodium calcium aluminum silicate) Labradorite, (Calcium sodium aluminum silicate) Bytownite, (Calcium sodium aluminum silicate) Anorthite, (Calcium aluminum silicate) (CaAl2Si2O8). The K-feldspars or alkali felspars:Microcline, (Potassium aluminum silicate) Sanidine, (Potassium sodium aluminum silicate) Orthoclase, (Potassium aluminum silicate) (KAlSi3O8 The feldspars are a group of minerals that have similar characteristics due to a similar structure. The general formula, for the common feldspars, is XAl(1-2) Si(3-2) O8 . The X in the formula can be sodium, Na and/or potassium, K and/or calcium, Ca. The different feldspars are distinguished by structure and chemistry. The potassium or K-feldspars are polymorphs, meaning they have the same chemistry, KAlSi3 O8, but different structures and therefore are different minerals. The plagioclase feldspars are a set of minerals that are in a series from a sodium rich end member, albite, to a potassium rich end member, anorthite. The intermediate members of the series are given arbitrary boundries based on their percentage of sodium or calcium. Often, feldspars are simply referred to as plagioclase and orthoclase (a K-feldspar) because identification to greater precision is difficult with ordinary methods. Once identified, however, some feldspar mineral varieties are found to have distinctive characteristics or originate from a classic locality and on these bases are recognized by mineral collectors as belonging to a specific feldspar mineral.Feldspar minerals are essential components in igneous, metamorphic and sedimentary rocks, to such an extent that the classification of a number of rocks is based upon feldspar content. The mineralogical composition of most feldspars can be expressed in terms of the ternary system Orthoclase (KAlSi3O8), Albite (NaAlSi3O8) and Anorthite (CaAl2Si2O8). Chemically, the feldspars are silicates of aluminium, containing sodium, potassium, iron, calcium, or barium or combinations of these elements.The minerals of which the composition is comprised between Albite and Anorthite are known as the plagioclase feldspars, while those comprised between Albite and Orthoclase are called the alkali feldspars due to the presence of alkali metals sodium and potassium. The alkali feldspars are of particular interest in terms of industrial use of feldspars. Amongst the numerous rocks in which they are present, feldspars are particularly abundant in igneous rocks like granite, which contains up to 50% or 70% of alkaline feldspar.Granite, however, rarely is used for its feldspatic content. Rather, a whole range of rocks geologically connected to granite is used. Most often, commercial feldspar is mined from pegmatite or feldspathic sand deposits. Aplite, which is a fine-grained igneous rock with the same mineralogical composition as granite, also is mined frequently for its feldspar content.ApplicationFeldspars are primarily used in industrial applications for their alumina and alkali content. Basically, the two properties which make feldspars useful for downstream industries are their alkali and alumina content. On those elements we can distinguish three families: Feldspathic sand, Pegmatite and Feldspar. A further distinction can be made between sodium, potassium and mixed feldspars, depending on the type of alkali they contain. Feldspars play an important role as fluxing agents in ceramics and glass applications, and also are used as functional fillers in the paint, plastic, rubber and adhesive industries. Glass: Feldspar is an important ingredient in the manufacture of glass and an important raw material as well, because it acts as a fluxing agent, reducing the melting temperature of quartz and helping to control the viscosity of glass. The alkali content in feldspar acts as flux, lowering the glass batch melting temperature and thus reducing production costs. Ceramics: In the manufacture of ceramics, feldspar is the second most important ingredient after clay. Feldspar does not have a strict melting point, since it melts gradually over a range of temperatures. This greatly facilitates the melting of quartz and clays and, through appropriate mixing, allows modulations of this important step of ceramic making. Feldspars are used as fluxing agents to form a glassy phase at low temperatures and as a source of alkalies and alumina in glazes. They improve the strength, toughness, and durability of the ceramic body, and cement the crystalline phase of other ingredients, softening, melting and wetting other batch constituents. Fillers: Feldspars also are used as fillers and extenders in applications such as paints, plastics and rubber. Beneficial properties of feldspars include good dispersability, high chemical inertness, stable pH, high resistance to abrasion, low viscosity at high filler loading, interesting refractive index and resistance to frosting. The products used in such applications are generally fine-milled grades. Enamel frits and glazes: Feldspar assists the enamel composition, assuring the absence of defects and the neatness of the end product: e.g. enamel frits, ceramic glazes, ceramic tile glazes, sanitaryware, tableware, electrical porcelain and giftware. And many other end-uses: paint, mild abrasives, urethane, welding electrodes (production of steel), latex foam, the welding of rod coating, and road aggregate. In the flooring sector, feldspar is the main constituent in the body composition. It is used as a flux, lowering the vitrifying temperature of a ceramic body during firing and forming a glassy phase. Surface tension pull the remaining solid particles together, giving a densification of the ceramic body. With rising temperatures the alkalis become more active and first dissolve the clay particles and then the free silica. In tableware, feldspar gives a good fusibility for a product without defects. In sanitaryware, the use of feldspar within vitreous ceramic bodies is used to facilitate the optimization process.

Potash Feldspar

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