Description:

Zeolites are microporous, aluminosilicate minerals commonly used as commercial adsorbentsAluminosilicates are obtained directly from the aluminosilicate rocks or as synthetic materials. These oxides have the general formula: mAl2O3 . nSiO, e.g., andalusite, sillimanite, disthene, kaolinite, topaz, and mullite. Natural aluminosilicate powders used in investment casting are supplied with various Al2O3 content, such as 42–47% (e.g., Molochite) and 60% (e.g., Remasil, Mulgrain), and with gradation in the range of 325# 120#. The higher the content of Al2O3 in the powder, the higher its resistance to temperature. Most common contaminants in aluminosilicate powder are: Fe2O3, TiO2, and ZrO2, while the content of CaO, MgO, K2O, P2O5, and Cr2O3 is very small. An important advantage of aluminosilicate powders is their availability and low price of about 0.5 €/kg.Mullite 3Al2O3 . 2SiO2 is a mineral that is rarely found in nature (known deposits on the Isle of Mull, Scotland). For industrial purposes, synthetic mullite is used almost exclusively (sintered or melted) with particle sizes up to: 0.07, 0.12, 0.25–0.5, 0.5–1.0 mm and of white color. The raw material is milled and fractionated for a suitable grain size matrix of the ceramic powders and stucco. The melting point of mullite is 1810 ℃ and density is 3.05 g/cm3, which does not depend on the temperature. It is characterized by high resistance to creep and thermal shock due to a low coefficient of thermal expansion and a low thermal conductivity. Synthetic mullite is characterized by a high chemical purity—total content of impurities does not exceed 0.5 wt%. The price is high (about 2.5 V/kg), thus it is used for ceramic molds for casting turbine blades with a DS or SC microstructure.

Physical Properties:

• Zeolites are widely used in industry for water purification, as catalysts, for the preparation of advanced materials and in nuclear reprocessing.
• They are used to extract nitrogen from air to increase oxygen content for both industrial and medical purposes. Their biggest use is in the production of laundry detergents. They are also used in medicine and in agriculture.
• Unique physical properties such as high surface area and ordered pore structure make mesoporous silica useful for diverse applications extending from CO2 sequestration to catalysis and heavy metal removal from waste streams. Our pelletized mesoporous materials are easy to handle and suitable for aforementioned applications especially in column format which is often required during continuous processing.Zeolite is a generic term used for any of the large group of minerals, comprising hydrated aluminosilicates of Na, K, Ca and Ba. These can readily be dehydrated and rehydrated, and find application as molecular sieves and cation exchangers.
• Natural zeolites are analcite, chabazite, heulandite, natrolite, stilbite and thomsonite. Artificial zeolites are made in many forms (ranging from gelatinous, to porous, to sand like varieties) and are used as gas absorbents, drying agents, catalysts and water softeners. Zeolites include a diverse group of compounds of sulphonated organic or basic resins.
• Zeolites are low-temperature and low-pressure minerals occurring commonly in basalts, denitrification products and as alteration products of feldspars and nepheline.
• Zeolites are also present in volcanic ash clay minerals. When applied to land or similar fields, they have a strong capacity for holding ammonium ions which reduce the leaching of the nitrate ions.
• Zeolites are called molecular sieves because of their use in separating mixtures by selective absorption.
• They are also used in sorption pumps for vacuum systems (e.g., In permutil), ion exchange systems (for water softening) and as catalysts.

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