The limonite is one of the main iron minerals, which is based on the moisture content of iron oxide as the main ingredient, brown natural multi-mineral mixture. But its iron content is not high, is secondary to iron ore. Limonite was various shades of brown, generally bell emulsion, grape-like, dense or loose block or even earthy limonite able to extract iron, can also be used as a pigment.
Classification of limonite
Limonite and high silicon limonite two categories. The skarn limonite accounted for 66% of high-silicon limonite accounted for 34% skarn limonite limonite, hematite and quartz, high-silicon limonite limonite , hematite, goethite and quartz. Brown iron ore in the mineral species have as many as 26 kinds, but mainly limonite and quartz, and other content is minimal.
The reasons for the formation of limonite
Exposure occurred to account for vulcanization brown iron ore deposits of acidic residual igneous rock and limetsone, and by the late long-term oxidation into pyrite skarn iron cap-like brown iron ore deposits, the average iron content of the entire deposit, geological grade for more than 37% brown iron ore, quartz accounts for more than 90% of the total, which accounted for 10% to 40% quartz
Origin distribution of limonite
Limonite iron content is lower than the magnetite and hematite, but it is loose, easy smelting, it is also important iron ore. The world-famous mineral deposits of Lorraine, Bavaria, Germany, Sweden, France.
The iron content of brown iron ore 37% to 55%, and sometimes phosphorus higher. Limonite of the absorbent, generally adsorbed with a lot of water to remove free water and crystal water in the roasting or into the blast furnace heat, thus increasing the porosity of ore, greatly improved the reduction of the ore. So the limonite more than the reduction of hematite and magnetite must be good. The same time, remove the moisture corresponding increase in the iron content of the ore.
Limonite beneficiation methods and equipment
Limonite commonly beneficiation method: weak magnetic and gravity separation, flotation, high intensity magnetic separation joint, that enable the weak magnetic spin recovery magnetite gravity separation, flotation, or iron minerals of high intensity magnetic separation recovery of the weak parts of speech, the magnetization the Fu burning and even the process of magnetic separation methods or other methods, and the magnetization of a single weakly magnetic iron ore, Fu burn similar to burning in the magnetization Fu magnetic separation in parallel with other beneficiation processes, powder ore is weak magnetic separation with the other methods combined, selective flocculation DesMario method.
Limonite commonly used in mineral processing equipment: trough feeder, jaw crusher (rough), jaw crusher (fine), vibrating feeder, ball mill, classifier (or high frequency screen), spiral chute, shaker, magnetic separator, flotation machine, dryer, and so on.