Beneficiation system for improving iron ore recovery rate

Abstract

The utility model discloses a beneficiation system capable of improving iron ore recovery rate, which comprises a primary cyclone, an overflow port of the primary cyclone is connected with a feed port of a primary magnetic separator, an iron ore outlet of the primary magnetic separator is connected with a feed port of a secondary cyclone, an overflow port of the secondary cyclone is connected with a feed port of a high-frequency sieve, and the high-frequency sieve is connected with an iron ore outlet of the primary magnetic separator. A screen underflow outlet of the high-frequency screen is connected with a feeding hole of the second-section magnetic separator; an oversize product outlet of the high-frequency screen is connected with a feed port of the tower mill, and a discharge port of the tower mill is connected with a feed port of the high-frequency screen; a tailing outlet of the elutriator is connected with a feeding port of the tailing cyclone, and a desilting outlet of the tailing cyclone is connected with a feeding port of the tower mill. Large-particle iron ore obtained after first-stage magnetic separation is separated through a high-frequency sieve, tailings discharged out of a tower mill are further separated through a tailings cyclone and sent to the tower mill together to be reground and crushed, magnetite and the tailings are separated, the part of iron ore is recycled in subsequent second-stage magnetic separation and elutriation, and the ore dressing recovery rate of the iron ore is increased.

Description

Technical field:

[0001] The utility model relates to the field of iron ore dressing, in particular to a dressing system for improving the recovery rate of iron ore. Background technology:

[0002] In iron ore production, Figure 1 As shown, after pre-magnetic separation, magnetite needs to undergo multiple wet magnetic separations to ensure that the iron in the magnetite can be recovered. Two magnetic separations are the most common. After the concentrate from the first magnetic separation is classified by the cyclone, the concentrate with large particle size is sent to the second ball mill for re-grinding, and the concentrate with small particle size is sent to the second magnetic separation. The concentrate selected from the second magnetic separation needs to be sent to the panning machine for re-selection, and finally filtered by the filter to obtain the iron concentrate. In the production process, in the first magnetic separation, the selected iron ore is the particle that can be adsorbed by the magnetic separator, but in order to ensure the quality of the concentrate, the second magnetic separation is the selected one, and its magnetic field strength is weaker than that of the first magnetic separation. Therefore, the iron ore particles that cannot be selected by the second magnetic separation still contain iron ore. The same is true for the panning machine. Therefore, the large particle tailings of the tailings of the second magnetic separation and panning machine still contain a small amount of iron that has not been selected, resulting in a large amount of iron ore being discharged into the tailings pond with the tailings, causing a waste of resources. Utility model content:

[0003] The utility model aims to provide a ore dressing system for improving the recovery rate of iron ore.

[0004] The utility model is implemented by the following technical solutions:

[0005] A mineral processing system for improving the recovery rate of iron ore comprises a primary cyclone, wherein the overflow of the primary cyclone is connected to the feed port of a first-stage magnetic separator, the iron ore outlet of the first-stage magnetic separator is connected to the feed port of a secondary cyclone, the overflow of the secondary cyclone is connected to the feed port of a high-frequency screen, the undersize outlet of the high-frequency screen is connected to the feed port of a second-stage magnetic separator; the oversize outlet of the high-frequency screen is connected to the feed port of a tower mill, and the discharge port of the tower mill is connected to the feed port of the high-frequency screen; the iron ore outlet of the second-stage magnetic separator is connected to the feed port of an elutriator, and the iron ore outlet of the elutriator is connected to the feed port of a filter; the tailings outlet of the elutriator is connected to the feed port of a tailings cyclone, and the sand settling outlet of the tailings cyclone is connected to the feed port of the tower mill; the tailings outlet of the first-stage magnetic separator, the tailings outlet of the second-stage magnetic separator and the overflow of the tailings cyclone are all connected to a tailings pond.

[0006] Preferably, the sand settling port of the primary cyclone is connected to the feed port of a first-stage ball mill, and the discharge port of the first-stage ball mill is connected to the feed port of the primary cyclone; the sand settling port of the secondary cyclone is connected to the feed port of the second-stage ball mill, and the discharge port of the second-stage ball mill is connected to the feed port of the secondary cyclone.

[0007] Preferably, the liquid discharge port of the filter is connected to the feed port of the second-stage magnetic separator.

[0008] The utility model has the advantages of separating large-particle iron ore after a first-stage magnetic separation through a high-frequency screen, and further separating the tailings discharged from the tower mill through a tailings cyclone, and sending them to the tower mill for regrinding and crushing, so that the magnetite is separated from the tailings, and this part of the iron ore is recovered in the subsequent second-stage magnetic separation and washing, thereby improving the iron ore dressing recovery rate. Description of the drawings:

[0009] Figure 1 It is the mineral processing flow chart mentioned in the background technology;

[0010] Figure 2 It is a structural schematic diagram of the utility model.

[0011] In the figure: a primary cyclone 1, a first-stage magnetic separator 2, a secondary cyclone 3, a high-frequency screen 4, a second-stage magnetic separator 5, a tower mill 6, an elutriator 7, a filter 8, a tailings cyclone 9, a first-stage ball mill 10, and a second-stage ball mill 11. Specific implementation method:

[0012] like Figure 2 As shown, a beneficiation system for improving the recovery rate of iron ore includes a primary cyclone 1, the overflow of the primary cyclone 1 is connected to the feed port of a first-stage magnetic separator 2, the iron ore outlet of the first-stage magnetic separator 2 is connected to the feed port of a secondary cyclone 3, the overflow of the secondary cyclone 3 is connected to the feed port of a high-frequency screen 4, the undersize outlet of the high-frequency screen 4 is connected to the feed port of a second-stage magnetic separator 5; the oversize outlet of the high-frequency screen 4 is connected to the feed port of a tower mill 6, and the tower mill 6 The discharge port is connected to the feed port of the high-frequency screen 4; the iron ore outlet of the second-stage magnetic separator 5 is connected to the feed port of the elutriator 7, and the iron ore outlet of the elutriator 7 is connected to the feed port of the filter 8; the tailings outlet of the elutriator 7 is connected to the feed port of the tailings cyclone 9, and the sand settling outlet of the tailings cyclone 9 is connected to the feed port of the tower mill 6; the tailings outlet of the first-stage magnetic separator 2, the tailings outlet of the second-stage magnetic separator 5 and the overflow port of the tailings cyclone 9 are all connected to the tailings pond;

[0013] The specific production process is as follows:

[0014] First-stage magnetic separation: The concentrate after pre-magnetic separation is sent to the first-stage cyclone 1 for classification. The iron ore with smaller particles is sent from the overflow port of the first-stage cyclone 1 to the first-stage magnetic separator 2 for magnetic separation. The iron ore with ferromagnetism is separated out. The selected concentrate is sent to the second-stage cyclone 3 for classification, and the tailings are discharged to the tailings pond.

[0015] Second-stage magnetic separation: the concentrate discharged from the overflow port of the secondary cyclone 3 is sent to the high-frequency screen 4 for screening, the undersize of the high-frequency screen 4 is sent to the second-stage magnetic separator 5 for magnetic separation, and the oversize of the high-frequency screen 4 is sent to the tower mill 6 for re-grinding and crushing, and then sent to the high-frequency screen 4 for screening; the second-stage magnetic separator 5 magnetically separates the iron ore again, and the selected concentrate is sent to the panning machine 7, and the tailings are discharged to the tailings pond;

[0016] Washing: The concentrate sent out by the second-stage magnetic separator 5 is sent to the washing machine 7 for washing, the selected concentrate is sent to the filter 8, and the tailings are sent to the tailings cyclone 9 for further separation. The large-particle tailings discharged from the sand settling port of the tailings cyclone 9 are sent to the tower mill 6 and mixed with the screen material of the high-frequency screen 4 for secondary crushing. The small-particle tailings discharged from the overflow port of the tailings cyclone 9 are discharged into the tailings pond;

[0017] Filtration: The concentrate discharged from the elutriator 7 is passed through the filter 8 for solid-liquid separation to obtain iron concentrate.

[0018] In the above process, after the first stage of magnetic separation, the large iron ore particles are separated by the high-frequency screen 4 and sent to the tower mill 6 for re-grinding and crushing, so that the magnetite is separated from the tailings. The magnetite is selected in the second stage of magnetic separation to improve the recovery rate of iron ore dressing.

[0019] The tailings discharged from the tower mill 6 are further separated by the tailings cyclone 9, and the large-particle tailings are sent to the tower mill 6 for secondary crushing. A part of this magnetite is selected in the second-stage magnetic separation, and a part is selected by the washing machine 7. The iron ore in the tailings of the washing machine 7 is recovered to improve the iron ore dressing recovery rate.

[0020] The sand settling port of the primary cyclone 1 is connected to the feed port of the first-stage ball mill 10, and the discharge port of the first-stage ball mill 10 is connected to the feed port of the primary cyclone 1; the sand settling port of the secondary cyclone 3 is connected to the feed port of the second-stage ball mill 11, and the discharge port of the second-stage ball mill 11 is connected to the feed port of the secondary cyclone 3; the large-particle iron ore separated by the first-stage cyclone and the secondary cyclone 3 is respectively sent to the first-stage ball mill 10 and the second-stage ball mill 11 for regrinding, and the iron ore is further crushed to ensure that the first-stage magnetic separation and the second-stage magnetic separation can select the iron ore.

[0021] The liquid discharge port of the filter 8 is connected to the feed port of the second-stage magnetic separator 5, and the water discharged from the filter 8 is sent to the second-stage magnetic separator 5 and returned to the production system to realize water reuse.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mineral processing system for improving the recovery rate of iron ore, characterized in that: The invention comprises a primary cyclone, wherein the overflow port of the primary cyclone is connected to the feed port of a first-stage magnetic separator, the sand settling port of the primary cyclone is connected to the feed port of a first-stage ball mill, and the discharge port of the first-stage ball mill is connected to the feed port of the primary cyclone; the iron ore outlet of the first-stage magnetic separator is connected to the feed port of a secondary cyclone, the overflow port of the secondary cyclone is connected to the feed port of a high-frequency screen, the sand settling port of the secondary cyclone is connected to the feed port of a second-stage ball mill, and the discharge port of the second-stage ball mill is connected to the feed port of the secondary cyclone; the screen undersize outlet of the high-frequency screen It is connected to the feed port of the second-stage magnetic separator; the screen oversize outlet of the high-frequency screen is connected to the feed port of the tower mill, and the discharge port of the tower mill is connected to the feed port of the high-frequency screen; the iron ore outlet of the second-stage magnetic separator is connected to the feed port of the elutriator, and the iron ore outlet of the elutriator is connected to the feed port of the filter; the tailings outlet of the elutriator is connected to the feed port of the tailings cyclone, and the sand settling outlet of the tailings cyclone is connected to the feed port of the tower mill; the tailings outlet of the first-stage magnetic separator, the tailings outlet of the second-stage magnetic separator and the overflow port of the tailings cyclone are all connected to the tailings pond.

2. A mineral processing system for improving iron ore recovery rate according to claim 1, characterized in that: The liquid discharge port of the filter is connected to the feed port of the second-stage magnetic separator.

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