Residual clays

Primary clay is also known as residual clay, indicating that they are either the in situ residue of one type of weathered rock or the transported residue of many types of rocks most primary clay deposits occur, however, in situ, at the location where the clay particles were formed. The clay is usually quite pure and colorless or white, but very small relative amounts of minerals mixed with the clay, such as quartz and/or iron oxides, may impart to it a yellow, brown, or green color. Primary clay is also characterized by the extreme fineness of its particles, which usually measure below 2 micrometers (0.002 mm) in diameter. The more than 20 different types of primary clay minerals can be distinguished by their chemical composition, which varies widely, and by their physical properties. Primary clays that have been used for making ceramic objects are listed in Table 55. 

Collector adsorption on residual clays has been decreased by employing various triethanolamine derivatives (molecular weight < 5000) as additional... 

Backfill of the Lagoon proceeded with soil earlier stockpiled on site. This material, derived from offsite construction excavations, consisted of dark red residual clay native to the Springfield area. Laboratory analyses certified this material to be free of dioxin and other contaminants. 

The geologist recognizes two main types of clay, residual and sedimentary. Residual clays are those which have not been transported by natural agencies, but have remained in their place of origin, such as the Cornish china clays, that are found with the granite rock from which they were formed by hypogenic action. Sedimentary clays are those that have been removed from their... 

The clay minerals are basically described as hydrous silicates and can be divided into two types on the basis of their natural locations, i.e., (i) residual clay, which is produced during surface weathering of rock by various means and is generally found in the place of origin, (ii) transported clay (or) sedimentary clay, which is produced by the chemical decomposition of rock and could be separated out from the original deposit through erosion... 

Residual clay deposits develop in place and are the products of weathering. In humid regions, residual clays tend to become enriched in hydroxides of ferric iron and aluminium, and impoverished in lime, magnesia and alkalies. Even silica is removed in hot humid regions, resulting in the formation of hydrated alumina or iron oxide, as in laterite. 

The composition of transported clays varies because these materials consist mainly of abrasion products (usually silty particles) and transported residual clay material. 

Description Silane surface-modified calcined clays very pure high brightness/low residue clay/silane/polymer interaction improves tensile strength and compression set used for cross-linked PE and polyester. EP elastomers amino silane for mineral-filled PA ... 

Primary Clay or Residual Clay. A clay still remaining in the geographical location where it was formed in the UK such a clay is typified by the china clay (q.v.) of Cornwall (cf. SEDIMENTARY CLAY). 

Residual Clay. See primary clay. Resinous Cement. A term used in chemical engineering for an acid-proof cement, based on synthetic resin, for jointing chemical stoneware or acid-resisting bricks. The cement, when set, is impervious and very hard. 

Fig. 6. Concordia diagram of zircon samples from fresh Morton Gneiss (Catanzaro, 1963) and its residual clay (Stern, Goldich, and Newell, 1966),...

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