Experience indicates that chrome ores are concentrated to best advantage by gravity methods. Since recoveries are generally very poor in the fine sizes, the gravity flowsheet must be designed to remove the chrome as soon as liberated by crushing and grinding. For example, if the chrome is not entirely freed until the ore is minus 16 mesh, it is obvious that the plus 16 mesh particles should be removed after stage crushing and grinding to prevent further reduction of the chrome and consequent loss in the fine sizes.
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Chromite Ore Crushing
The crushing section for this 250 ton per day chrome mill consists of a coarse ore grizzly, a coarse ore bin with pan feeder to a 18 reduction crusher and a crusher discharge conveyor to a crushed ore bin. On this particular ore, we find that there is no chromeliberated in sizes larger than ¼. Accordingly the crusher discharge opening is ¾ and the minus ¼ material is removed for concentration before further reduction.
The 36x 8 Adjustable Stroke Ore Feeder is used to accurately control feed of crushed ore to the grinding section. Before it is fed to the 4x 8 Peripheral Discharge Rod Mill, the minus ¼ chrome ore is removed from the grinding circuit by means of a 4x 12 Dillon Vibrating Screen. This minus ¼ product is then ready for concentration in the Mineral Jigs. The Vibrating Screen oversize is ground in the Steel Head Rod Mill. A rod mill with the peripheral discharge feature is preferred for th...
Gravity Recovery Section
The minus ¼ undersize from the Vibrating Screen is divided to feed two identical, parallel jigging circuits, each consisting of l6x 24 Duplex Mineral Jig used for roughing and a I6x 24 Duplex Mineral Jig used as a scavenger. Automatic Density Discharge Control Valves on the hutches of the scavenger Mineral Jig provide a controlled, continuous, high density feed to a l6x 24 Duplex Mineral Jig used for final cleaning. A final, cleaned concentrate is produced by the two cleaner Mineral Ji...
This flowsheet is very effective due to the ability to remove the high grade chromewith very little grinding on each pass through the mill. In this way, grinding takes place with a large number of small reductions followed by immediate removal of the liberated chrome into a high grade concentrate. In the concentration of certain chrome ores, high grade chrome particles are sometimes liberated at sizes larger than ¼, For the concentration of these large size chrome particles, the Improved Harz Type Jig is indicated. In the flowsheet described here, there is a minimum amount of valuable chrome in the classifier overflow and accordingly this product is sent to waste. However, conditions may justify the installation of slime concentrating tables and Tilting Concentrators. 1. Melting Point:3,465 F 2. Boiling Point:4,840 F 3. Atomic Number:24 4. Atomic Symbol:Cr 5. Atomic Weight:51.9961 6. Word origin: The word chromium comes from the Greek word chroma. Source:...
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Chrome process equipment is wet type strong magnetic separator, and spiral chute of gravity separator. 3 Experimental results and discussion 3.1 Chrome magnetic separation process. The chrome raw ore is a flotation tail ore, which is mainly formed in the chromite, and the chromite is the target recovering mineral.
Deslimed chromite ore was floated at pH 1.5 to 5.5 using a long chain fatty acid collector and soluble fluoride ions as a silicate depressant. The Havens method was later modified slightly to permit flotation without preliminary desliming. This was done by preconditioning the pulp with fuel oil and fluoride ion.
For chrome processing technology, there are gravity separation, flotation, magnetic separation and other methods. Xinhai will determine the final processing technology according to the ore characteristic analysis report and mineral processing experiment report. Gravity Separation. The common gravity separation flows is that: through crushing ...