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EC number: 308-551-1 | CAS number: 98072-94-7 Natural ilmenite ore is concentrated by selective removal of impurities, chiefly iron, to yield a product enriched in titanium dioxide. The process consists of an optional oxidative roast followed by a reductive roasting stage, an acidic leaching stage and washing and drying the product. Alternatively the process consists of selectively chlorinating the iron oxide present in the reduced ore.
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No reliable data on terrestrial toxicity are available for synthetic rutile. A read-across approach with upgraded ilmenites (UGI) is used as well as testing with soil macroorganism and an assessment of the potential for secondary poisoning is waived.
Reliable chronic NOEC values are available for the effect of upgraded ilmenites (UGI, > 80% TiO2) on arthropods (Folsomia candida), plants (barley and lettuce) and soil microorganisms (nitrification). The NOEC values range between 1,000 mg/kg dw and >= 100,000 mg/kg dw. The lowest NOEC was observed for the effect of the UGI Exxaro SO4 on mortality and reproduction of the terrestrial arthropod Folsomia candida.
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