Natural red oxide

NATURAL GAS, refrigerated liquid (crt ogenic liquid) (with high methane content) (UN 1972) (DOT) see MDQ750 NATURAL IRON OXIDES see IHC450 NATURAL LEAD SULFIDE see LDZOOO NATURAL RED OXIDE see IHC450... 

RED BURNT SIENNA BURNT UMBER CALCOTONERED COLCOTHAR COLLOIDAL FERRIC OXIDE FERRIC OXIDE INDIAN RED IRON(in) OXIDE IRON OXIDE RED IRON SESQUIOXIDE JEWELER S ROUGE MARS BROWN MARS RED NATURAL IRON OXIDES NATURAL RED OXIDE OCHRE PRUSSIAN BROWN RED IRON OXIDE RED OCHRE ROUGE RUBIGO SIENNA SYNTHETIC IRON OXIDE VENETIAN RED VITRIOL RED YELLOW OXIDE OF IRON... 

CAS 1309-37-1 (anhyd.) EINECS/ELINCS 215-168-2 Synonyms Anhydrous iron oxide Cl 77491 Colloidal feme oxide Ferric oxide red Ferrosoferric oxide Iron (III) oxide Iron oxide red Iron s uioxide Natural iron oxides Natural red oxide Pigment brown 6 Pigment brown 7 Pigment ted 101 Pigment red 102 Red iron oxide R iron Irioxide Yellow ferric oxide Classificatbn Inorganic color syn. iron oxide Emprical FCiOj... 

Iron (III) oxide Iron oxide red Iron sesquioxide Natural iron oxides Natural red oxide... 

Natural musk ambrette. See Ambrettolide Natural orange 4. See Annatto (Bixa orellana) Annatto (Bixa orellana) extract Natural orange 6. See Lawsone Natural pearl essence. See Guanine Natural red 4. See Carminic acid Natural Red Beet Liq. 275280. See Betanine Natural red oxide. See Ferric oxide Natural rubber CAS 9006-04-6... 

Ferric oxide (1882) n. Fe203. Iron (III) oxide. Stable anhydrous oxide of iron. This constitutes the major ingredient in the chemically prepared synthetic reds. Indian reds, iron oxides, etc., but in the natural red oxides the proportion of ferric oxide varies considerably and is frequently associated with hydrated forms of the oxide. 

Iron oxide pigments Manufactured iron oxides Mars red Mars brown Natural red oxide Natural iron oxide Red oxide Red oxide of iron Supra... 

If an aqueous solution of an iron(lll) salt is treated with alkali, a red-brown precipitate of iron(III) hydroxide is obtained this is probably best represented as FeO(OH). On strong heating it gives the red oxide Fe203. Iron(III) oxide, Fc20, occurs naturally as haematite, and can also be prepared by strong heating of iron(II) sulphate ... 

Iron Oxides. In addition to the black iron oxide, there are several natural and synthetic yellow, brown, and red oxides. As a class, they provide inexpensive but dull, lightfast, chemically resistant, and nontoxic colors. The natural products ate known as ocher, sieima, umber, hematite, and limonite. These include varying amounts of several impurities in particular, the umbers contain manganese. Their use is limited because of low chroma, low tinting strength, and poor gloss retention. 

The natural iron oxide pigments are termed the ochres which are yellow and contain goethite (10-50%) as the Fe oxide constituent, the reds, with a high content of hematite, the medium to dark yellow siennas, the umbers and the blacks, which consist of magnetite (Benbow, 1989 Buxbaum Printzen, 1993). 

A further important application of these pigments is in paints. The natural red iron oxides are also used in primers for steel structures and cars, for marine coatings and for anti-fouling paints. In the USA, the metallic browns are used for these purposes. The level of soluble salts in the latter pigments is low and this reduces corrosion problems. The metallic browns are also used in heat resistant enamels. 

Like the natural iron oxide pigments, the synthetics are used for colouring concrete, bitumen, asphalt, tiles, bricks, ceramics and glass. They are also used extensively in house and marine paints. Because the shapes of the particles can be accurately controlled and the particle size distribution is narrow, synthetic iron oxides have a greater tinting strength than the natural ones and so, are chosen where paint colour is important, i. e., for top coats. Red iron oxides are used in primers for automobiles and steel structures. 

Natural Fe oxides have also been used for water purification. In a laboratory study, a natural ferrihydrite (surface area of 243 m g ) originating from a ferriferrous acid spring turned out to be capable of removing > 95 % of the inorganic phosphate from water with 0.1 mg P L (WeiE et al., 1992). The so-called Red Mud, a waste product of the alumina industry, containing 330 g Fe/kg was also effective, whereas a tropical soil with 80 g kg Fe was comparatively less so (WeiE et al., 1992a). Nine... 

Oeeurrenee.— In nature as oxide (2SaO) in red tine, as sulphide (ZbS") in the mineral akte hlende, earbonate(OOZno")... 

Iron oxides are supplied to the market as red, ocher, sienna, and umber natural pigments. The hue of the natural iron oxide pigments is determined by raw material composition and processing. 

The principal red and yellow pigments are Lead chromate chrome yellow, orange and red), zinc chromate zinc or buttercup yellow), barium chromate lemon yellow or yellow ultramarine) various products based on jerric oxide, hydrated (yellow) or anhydrous (red), both natural yellow and red ochres) and artificial Mars yellow, English red, etc.) red oxide oj lead minium or red lead) mercuric sulphide cinnabar, vermilion) antimony oxysulphide antimony cinnabar) cadmium sulphide cadmium yellow) basic lead antimonate Naples yellow). 

Spinel is another simple oxide mineral. It is commonly seen today as a synthetic and may be any color. Natural red spinel was most prized as a gem, and usually was used as an imitation of ruby. Some notable pieces in the British and Russian crown jewels include large uncut spinels. These crystals are a deep red color and are distinctive because of their rough octahedral shape. 

Persian Gulf red oxide is derived from Ormuz Island. The hematite deposits contain about 72% Fe203 and are the highest-chroma naturally occurring red oxide. Spanish red is derived from hematite deposits near Malaga, Spain, and contain about 90% Fe20> It is less saturated than Persian red and contains carbonates, limiting its use in acidic media. 

Natural and oxides of iron are mined either as the mineral hematite (Fe203) or as hematite in its hydrated form. Indian red is a naturally occurring mineral whose ferric oxide content may vary from 80 to 95 percent, the remainder being clay and silica. It is made by grinding hematite and floating off the fines for use. 

Natural reds such as persian red (found at Hormuz in the Persian Gulf), spani.sh red and burnt sienna contain ca. 50% iron oxide and represent the most important group of natural mineral pigments. Their tinting strength increases with increasing a-Fc203 content, which can amount to 95% in the purest sorts. Their utilization is mostly limited to primers, cheap ships paints and house paints (USA, Scandinavia). 

Iron Oxide Pigments. The discovery of iron oxide pigments is lost in antiquity. The cave paintings of early man were made with earth colors composed of iron oxides. Even today, natural iron oxides are still in use. The yellows such as the yellow others and siennas are hydrated ferric oxides (Fe203 H20). The nonhydrated ferric oxides (Fe203) comprise the reds and browns such as the red ochers and brown umbers. The blacks are mixed ferrous and ferric oxides (Fe304 or more precisely Fe0 Fe203). 

OSO . piitox] Red and yellow iron oxides synthetic iron oxidm for coatings and plastics natural red iron oxide for highly loaded coatiqgs, primers, industrial maintenance finishes, exterior applies., building inods., rubber, plastics. 

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