Copper silicate

Copper conversion Copper matte, scrap copper, siliceous flux Sulfur dioxide, particulate matter containing arsenic, antimony, cadmium, lead, mercury, and zinc Acid plant blowdown slurry/sludge, slag containing iron sulfides, silica... 

Octadecyl-bonded phases Copper silicate gel Cyclodextrin-bonded phases Hydroxyapatite-covered silica Graphitized carbon... 

Lapis lazuli is a deep blue gemstone that is a complex copper silicate mineral varying widely in composition. It often contains sparkles of iron pyrite or calcite. The best source is probably Afghanistan. A pale blue variety is found in Chile. Some material sold as lapis lazuli is actually artificially colored jasper from Germany. 

According to the foregoing interpretation, chrysocolla of ancient times is neither malachite nor a blue copper silicate (the mineral now called chrysocolla) but is a yellow substance, possibly the yellow mineral cadmium sulfide, which appears as a coating on other minerals, chiefly zinc sulfide. This description fits Pliny s text, which describes gold solder (chrysocolla) as a liquid that flows from several mines to give a solid deposit. ... 

Inorganic copper compounds include cuprous oxide cupric oxide copper hydroxide copper carbonate basic copper ammonium carbonate copper acetate copper sulfate copper sulfate, tribasic (Bordeau Mixture) copper oxychloride copper silicate copper lime dust and copper potassium sulfide. Figure 5.10 shows a package of Kocide 101, copper containing products. 

Ludt, R. W., The Flotation of Copper Silicate by Alkyl-substituted Triphenyl Methane... 

Cu2+ ions stabilized at the surface of SiOz and AI2O3 give rise to reduction peaks at 300-380 C. The reduction of surface spinel in CU/AI2O3 is indicated at 462°C. The reduction of copper silicate is not finished even at 700 C. 

In the present work two syntheses for litidionite have been developed which are straightforward and require only simple apparatus. In one a sodium-potassixam-copper silicate glass is made and then devitrlfled over a period of weeks at approximately 765 C. In the other a mixture of sodium carbonate, potassium carbonate, cupric oxide, silicon dioxide, again with a Na K Cu Si ratio of 1 1 1 4, is sintered at approximately 765 C for a number of days. 

The group of Jacobson has reported a microporous copper silicate that contains silicate layers linked by Cu04(0H2)2 groups, themselves arranged as corner-sharing chains. The structure has a neutral framework, in which alkali metal hydroxide species reside after synthesis, and possesses pores bounded by large 12MRs. So far it has not been possible fully to remove species from within the pores, so that the potential porosity of the solid has not been achieved, but it can be reversibly dehydrated. 

Janczak, J., and Kubiak, R. (1992) Stmcture of cychc barium copper silicate... 

Fig. 31 SEM images of the as-prepared silicates (A) copper silicate (B) nickel silicate (C) cobalt silicate (D) manganese silicate, TEM images of the as-prepared silicates (E) copper silicate (inset magnified TEM image showing tube structures) (F) nickel silicate (G) cobalt silicate (H) manganese silicate. Reproduced from Ref, 65 with permission from The Royal Society of Chemistry.

High magnification SEM images (Fig. 31A-D) showed that their surface had varying roughness over the whole tubular structure. The copper silicate consisted of uniform rod-like units assembled into a tubular shaped structures (Fig. 31A). Nickel silicate (Fig. 31B), cobalt silicate... 

Egyptian blue n. Blue pigment, of ancient origin, which is substantially a copper silicate, obtained by calcinations. 

Sheetlike, crystalline forms of silica obtained by extracting layer-type basic copper silicate with acid (92, 93). 

Kautsky and associates (92, 93) have studied in some detail the lepidoidal silica obtained from a synthetic layerlike colloidal copper silicate which they formulate as [(Si Og)(OH),2][OCuOH]. It has a very high specific surface area similar to the copper mineral chrysocolla (95, 96), which has a specific surface area greater than 300 m g . The corresponding silica has ion-exchange properties, but all the original copper cannot be put back into the structure once it has been removed. 

The ethylenediamine copper silicate was obtained in the form of a slightly different hydrate [Cu(en)2]g[Si802o] dSHjO and the structure determined by X-ray diffraction by Smolin, Shepelev, and Butikova (153), who confirmed the existence of the anion [Si302o] " which is a fourfold two-story ring. The anions and cations are bound into a structure through hydrogen-bonded water molecules. 

The amount of silica in solution is reduced by the addition of metal salts. Thus spraying a rice plant and soil with copper sulfate solution reduced the amount of silica deposited in the leaves (121). This eHect is undoubtedly due to the formation of insoluble copper silicate, which thus rendered the silica unavailable. 

Egyptian Blue. A colour resulting from the formation of a complex copper silicate in an alkaline glaze or glass the colour was much used by the ancient Egyptians and subsequently by the Persians. 

ClgHgsCo NigOi S, Tris(di-M hydroxo-bis(ethylenediaminecobalt-(II)))cobalt(II) tetrakisthiocyanate bisnitrate dihydrate, 44B, 816 ClsHi40CU4N1gOseSisr Bis(ethylenediamine)copper silicate complex. 

Calcium copper silicate Egyptian blue Riederer (1997)... 

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