Phosphorus can be removed from iron ore by very different routes of treatment. The genesis of the reserve, the mineralogy, the cost and sustainability define the technology to be applied. The...
per year. The minerals in the iron ore are mainly of magnetite and hematite, but many of the iron ore rocks and mines contain sulfide minerals such as pyrite, chalcopyrite, arsenopyrite, etc. The sulfur content of iron ore concentrates is generally about 0.5% to 2%, and sometimes more than 0.7%, while the permitted limit of steel industries is
Increasing iron ore demand, coupled with the depletion of high grade hematite ores in the United States, after World War II led to development of lower grade iron ore sources, principally the utilization of magnetite and taconite. Iron ore mining methods vary by the type of ore being mined.
To re move phosphorus from the high phosphorus iron ore has been researched in a number of countries and many processes have been developed for various phosphorus containing iron ores. In summary, they are bio leachingC3, chemical leachingC4 and roasting magnetic separationC5, selective agglomeration plus reverse flotationc6.
In order to effectively remove the phosphorus from high phosphorus iron ores, while reduce the amount of acid and the iron losses, phosphorus will be removed in the form of soluble phosphate salts by selective hydrochloric acid leaching in this research.
Acid leaching is the most efficient method for removal of phosphorus from iron ore. Among the tested acids, sulfuric acid is the most effective for this purpose. The leaching time is low and the iron loss is negligible .
With the present rates of iron ore consumption, currently unusable, high phosphorus iron ore deposits are likely to be the iron ores of the future as higher grade iron ore reserves are depleted.
REMOVAL OF PHOSPHORUS THROUGH ROASTING OF OOLITIC IRON ORE WITH ALKALINE EARTH ADDITIVES . K Ionkov. 1, S Gaydardzhiev. 2, D Bastin. 3, A Correa de Araujo. 4. and M Lacoste. 5. ABSTRACT . The present study is devoted to improvement of the leaching efficiency during phosphorous removal from high phosphorous gravity magnetic concentrate.
The results show that phosphorus occurring as apatite phase could be removed by alkali leaching, but those occurring in the iron phase could not. Sulfuric acid is the most effective among the three kinds of acid. 91.61% phosphorus removal was attained with 1% sulfuric acid after leaching for 20 min at room temperature.