Aluminate pigments

Patton (1973d) Patton, T.C. Sodium Sihco Aluminate Pigment Handbook 1 Patton, T.C. (ed.) John Wiley, New York (1973) 229-231... 

Sodium aluminate is used in water purification, in the paper industry, for the after treatment of Ti02 pigment, and in the manufacture of aluminum containing catalysts and zeoHte. Worldwide markets are in the range of 125,000 t/yr (19). 

Cobalt alloys, 7 219-226. See also Cobalt high temperature alloys for orthopedic devices, 3 728 selenium and metallurgy of, 22 98 Cobalt alloy T-800, 7 223 properties, 7 223t CobaltCII) aluminate, uses, 7 241t Cobalt aluminate blue spinel, formula and DCMA number, 7 348t Cobalt Aluminate Blue, pigment for plastics, 7 370t... 

Zinc Chrome Cobalt Aluminate Blue pigment for plastics, 7 370t Zinc chromite... 

Table 3.4 Comparison of the properties of alkaline earth aluminate and zinc sulfide phosphorescent pigments...

The majority of phosphors for cathode-ray tubes are coated with an oxide, silicate, or phosphate before use to improve their processing properties and stability to bum-in. Pigmenting of Y202S Eu3+ with finely divided Fe203 and of ZnS Ag+ with ultramarine or cobalt aluminate is also known. The pigment, which has the same body-color as the emission color of the phosphor, absorbs incident ambient light, effecting an increase in contrast [5.430]. 

For oil paints, to keep the pigment in suspension throughout the oil, stabilizers, such as aluminate stearate or beeswax, can be added. 

Ultramarines are complex sodium aluminates with a zeolite structure. The crystal lattice is approximated by the chemical structure Na6Al6Si6024, with entrapped sodium ions and ionic sulfur groups (S2 and S3). The ionic sulfur imparts the pigment s color. 

Regulated Colorants That Are FDA Approved. It often seems a contradiction that many of the colorants that are suitable for use in food contact applications must also appear on an MSDS as a reportable or hazardous material. Examples include zinc oxide and zinc sulfide, both zinc compounds chromium oxide green (pigment green 17), a chromium compound carbon black and cobalt aluminate blue (pigment blue 28), which is not only reportable because of its cobalt content but is also a suspected carcinogen. 

Thenard A process for making white lead pigment (basic lead carbonate) by boiling litharge (lead monoxide) with lead acetate solution and passing carbon dioxide gas into the suspension. L.J. Thenard (1777 to 1857) was an eminent French chemist, more famous for his invention of Thenard s blue (cobalt aluminate). 

Sodium aluminate (theoretical formula NaA102) has a certain industrial importance not only as an intermediate in the digestion of bauxite in the Bayer process (see Section 3.2.4.2). USA production of sodium aluminate in 1993 was estimated to be 85 10- t/a. Sodium aluminate is produced by dissolving hydrated aluminum oxide in 50% sodium hydroxide. It is utilized in water purification, in the paper industry, for the post-treatment of Ti02-pigments, for the manufacture of aluminum-containing... 

The facile formation of a yellow, sparingly soluble complex salt of the composition K3[Co(N02)6] has been used as a simple qualitative test for cobalt ions in solution. A more sensitive test is based on the formation of the intensely blue cobalt aluminate, CoO AI2O3, a pigment also known as The-nard s Blue. A spot-test utilizing a-nitroso-a-naphthol allows detection of 0.05 pg of Co at a dilution of up to 1 1000000. 

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