Iron ore dressing plant
There are magnetic iron ore like magnetite and weak magnetic iron ore like liminite, hematite, specularite, and for these two kinds of different iron ore, different upgrading way will be involved. For manganetic iron ore, magnetic separation is prior to be considered to get the high grade iron concentrate. But if magnetic separation is still used for the weak magnetic iron beneficiation, a large plant investment will be needed because it needs strong intensity magnetic separator to work. However, here gravity separation can also work for the weak magnetic iron ore. So when the gravity separation can be used? Firstly, the inlay size of iron granules shall be coarse with clear bounds with the other gangue, and crushing can dissociate the iron grain from the raw gangue. Second, there shall be density difference between the iron granules and the other inlayed gangue. On both conditions, the iron ore can be upgrading by gravity separation machine.
1) gravity separation for coarse iron embedded
This kind of iron ore is very easy to enrich, and usually flow sheet of ore-washing, desliming, jigging, and gravity-medium separation has been used to gain the high-quality iron concentrate. The main machines for the iron roe graavity separation cover jiggers, heavy-medium separators.
2) gravity separation for fine iron embedded
This fine size embedded iron ore is very common in China, and the separation methods and equipment has been developed. gravity separation, esp. fine size gravity separation has gained new develpomeny , and sluice, spiral washing machine, and centrifugal separator has bee used in the flow sheet for the iron ore beneficiaton gaining a great beneficiation efficiency.

Here the iron jig machine has been introduced as the ideal separation gravity separation for weak magnetic iron ore. Test can be done if samples about 15kg can be available.