The hydrolyzable ions in iron ore flotation pulp are normally calcium, magnesium and iron. According to Krishnan and Iwasaki, these ions are either released into the flotation pulp from mineral particles or occur from hard water. ImagesMore results in images
the most popular flotation route in iron ore industry, the direct flotation of iron ox ides still appears desirable for some low grade iron ores that contain a vast amount of quartz. For example, at Republic Mine, Michigan, U.S.A., a hematite ore is upgraded from 36.5% Fe to 65.4% Fe with a Fe recovery of 82.5% using the direct flotation route.
The role of reagents utilised in iron ores flotation is reviewed. Desprm and flotation stages should be performed at pH levels as low as possible to reduce the expenses with caustic soda. Ether amines are by far the mostly utilised class of collector. The degree of neutralisation of the ether amine is an important process parameter.
Many iron -ore producers world -wide are considering columns as a viable alternative to conventional flotation machines for the reduction of silica in fine pellet feed. The ability to operate w ith wash water and deep froth beds results in improved iron recoveries particularly when producing direct reduction grade concentrate.
RFC-Upscaling proposes the Reflux Flotation Cell RFC technology for mineral processing companies, with ROI in 3 – 4 years. Within the project, it is planned to commercialise the technology as a new product of FLSmidth for copper and iron ore. The RFC requires 30 % less capex and 20 % less opex compared to the existing flotation technologies.
The iron ore concentrate of the first flotation cycle corresponded to the new feed material of the second cycle and was collected in a bin. In this bin between the two cycles, post-conditioning was carried out with one addition of collector. The sulfur-bearing pyrite was directly floated and collected in an overflow bin.
grade iron ore to produce quality material would play a key role in future which is a fact acknowledged by the iron and steel industry. 1,2 India is bestowed with rich iron ore reserves in the form of hematite and magnetite. Most of the iron ore mines produce hematite ores and have washing plants to produce lumps as well as fines.
In direct flota- tion, iron bearing mineral, mostly hematite, is floated using oleate as collec- tor leaving siliceous gangue, usually quartz, in the tailings. Kick et al. were among the first to investigate the utility of various collectors in hematite flotation from quartz.