The term 'ball' traces to historic mining in England where large chunks of the clay were cut from the bank in ball shapes for transport to processing. It differs from china-clay in having high plasticity and less refractoriness. This DFAC test disk shows the incredible drying shrinkage that a ball clay can have. These particles contaminating particles are exposed on the rim of a bisque fired mug. Ball clays commonly contain carbon, many have a noticeable grey color in the raw state because of this. Below I have begun to sponge them off, the one on the right is sticky. 1 Glaze ball clays work well in glazes. But in this case they are not and have a minimal effect. A typical white high temperature stoneware is often about 25% each of kaolin, ball clay, feldspar and silica. The glaze fits, the body has zero porosity (very dense) and plasticity is fantastic! L��?fa� �� �=3������X��L���[ao�� W燂�j�$T�M�fK.E�� Ball clay is not a clay mineral in itself, but contains other minerals, primarily kaolinite (but also montmorillonite, halloysite, and illite). Gujarat Mineral Development Corporation Ltd. Department of Industrial Policy & Promotion. A. <>>> Ball clays are used in many different industries, but in particular form a vital component in ceramic manufacturing. Thus it does not have porcelain density. The refractories industry is a large user of ball clay. While potters only buy ball clay as a powder, industrial users have access to the material in many forms (shredded, noodled and partially deflocculated, chopped filter press cake, vacuum pugged extrusion, crumble with about 10% moisture). Ball clays tend to be quite refractory (PCE 28-34) and some less processed deposits are sold as fireclays. This can partly be explained by the particle packing achieved because of the fine particle size. These chunks of metal were pulled out by magnets in the production line, a thousand boxes of porcelain are now garbage. Left: 65% #6Tile kaolin and 35% nepheline syenite. It is much more plastic than kaolin but also has much higher dry shrinkage and higher iron content. We Provide a Wide Range of Raw and Processed Materials for the Ceramic Industry. x��=]��8��D��e"�.hcY�#�:���Y�ٍ � This is even more unexpected since, given that it has a lower drying shrinkage, and should be more refractory. Mica and quartz are also present in substantial amounts (e.g. We Supply Plastic & Non Plastic Clay, Ball Clay & Kaolin in Malaysia. endobj There are hundreds of different ball clays available. Although some ball clays resist deflocculation because of hostile soluble impurities, most deflocculate very well with sodium silicate and other equivalent dispersants. If 15-20% is present no other suspender should be needed. The one on the right has settled and on incline the watery upper is running off. 2 0 obj Remnants of the lignite remain inside the matrix and can pinhole glazes. It’s the standard in baseball clay mixes, offering both quality and value. Both are zero porosity. 10-20% for Tennessee ball clays). The abrasives industry likewise uses it to bond aggregates until firing fuses the mass. However, care is recommended to make sure a fine grade of bentonite is used to avoid fired specks (bentonite also burns darker). These are the oversize particles (from the 70, 100, 140 and 200 mesh sieves) from 100 grams of a commercial ball clay. For fired appearance, the top one. Obviously if too much of this is employed in a body recipe one can expect it to put stress on the body during drying. In one test we made 50:50 ball clay:feldspar mixes of 8 different common ball clays (from a range of suppliers), from cone 6 to 10 all had the same porosity and fired appearance. The particles of the kaolin (white) are flatter and lay down as such, that is why it feels smoother. Common refractory materials lack plasticity and ball clay is used to help in forming and shape retention and to impart dry strength. Ball clay — is a plastic clay used in the ceramic industry to provide strength and malleability to a ceramic body prior to firing. The 10 mesh designation is a little misleading, those are agglomerates. It's white but crazes the glaze and has 1% fired porosity (measured in the SHAB test).