Device for separating micro-fine particle phosphorite from iron separation tailings

Abstract

The utility model relates to a device for sorting micro-fine particle phosphorite from iron tailings, belongs to the technical field of mineral processing, and solves the problem that an existing phosphorite recycling device cannot effectively sort micro-fine particle phosphorite. The device comprises a rotational flow grading device, a size mixing device and a flotation column which are sequentially communicated, the size mixing device is located between the rotational flow grading device and the flotation column, a lower end outlet of the rotational flow grading device is communicated with an inlet of the size mixing device, and an outlet of the size mixing device is communicated with a feeding inlet of the flotation column; the rotational flow grading device is used for performing rotational flow grading treatment on the iron separation tailings; and the size mixing device is a mixing device for grading underflow of the rotational flow grading device and a flotation reagent. The cyclone grading device and the flotation column are combined, and the comprehensive recovery rate of micro-fine particle phosphorite is increased under the cyclone grading effect of the cyclone grading device and the flotation effect of the flotation column for iron tailings.

Description

Technical Field

[0001] The utility model relates to the technical field of mineral processing, in particular to a device for separating fine-grained phosphorus minerals from iron ore tailings. Background Art

[0002] As an important resource, phosphate rock is mainly used to produce phosphate fertilizer, accounting for about 66% of total consumption. my country has abundant reserves of phosphorus resources, but the distribution is uneven, showing the characteristics of "more in the south and less in the north, and phosphorus from the south is transported to the north". Therefore, how to strengthen the efficient development and utilization of phosphate resources in the north and promote the comprehensive utilization of medium and low-grade phosphate ores and tailings is of great significance to improving the sustainable guarantee capacity of my country's phosphorus resources.

[0003] As an associated element, phosphorus has an average grade of 2% to 3%. As the phosphorus market improves, related enterprises gradually recover phosphorus from iron ore tailings, generally using a coarse separation-inclined plate thickening desludging-flotation device, but this device mainly recovers coarse and medium-sized phosphate minerals (particle size greater than 38μm and less than 106μm). Although phosphorus in iron ore tailings is recovered to a certain extent, the overall recovery rate is low. The main reason is that over-grinding or fine-grained embedded apatite is lost with the overflow of the inclined plate, and fine-grained phosphate minerals (particle size less than or equal to 38μm) cannot be effectively separated. Utility Model Content

[0004] In view of the above analysis, the utility model aims to provide a device for separating fine-grained phosphate minerals from iron ore tailings, so as to solve the problem that the existing phosphate ore recovery devices cannot effectively separate fine-grained phosphate minerals.

[0005] The utility model provides a device for separating fine-grained phosphate minerals from iron ore tailings, the device comprising a cyclone classification device, a slurry mixing device and a flotation column which are connected in sequence;

[0006] The slurry mixing device is located between the cyclone classification device and the flotation column, the lower end outlet of the cyclone classification device is connected to the inlet of the slurry mixing device, and the outlet of the slurry mixing device is connected to the feed inlet of the flotation column;

[0007] The cyclone classification device is used to perform cyclone classification treatment on iron ore tailings;

[0008] The slurry mixing device is a mixing device for mixing the classification underflow of the cyclone classification device with the flotation reagent.

[0009] Preferably, a foam collecting tank is provided at the top of the flotation column.

[0010] Preferably, the flotation column comprises a column flotation section and a cyclone separation section which are connected from top to bottom, and the feed inlet is located in the column flotation section.

[0011] Preferably, the cyclone separation section is provided with a slurry circulation device.

[0012] Preferably, the slurry circulation device includes a circulating slurry outlet, a circulating slurry inlet, a circulating pump and a microbubble generator. The circulating slurry outlet is arranged at the bottom of the flotation column, and the circulating slurry inlet is arranged at the connection between the column flotation section and the cyclone separation section. The circulating slurry outlet is communicated with the circulating slurry inlet, and a circulating pump and a microbubble generator are sequentially arranged between the circulating slurry outlet and the circulating slurry inlet along the material flow direction.

[0013] Preferably, a first feeding pump is arranged between the cyclone classification device and the slurry mixing device.

[0014] Preferably, a second feed pump is provided between the slurry adjusting device and the flotation column.

[0015] Preferably, a tailings discharge port is provided at the bottom of the flotation column.

[0016] Preferably, a discharge pump is provided on the pipeline where the tailings discharge port is located.

[0017] Preferably, a stirring component is provided in the slurry mixing device.

[0018] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0019] 1. The utility model combines a cyclone classifier with a flotation column. Since minerals with a particle size of less than 10 microns are basically at the sludge level and are difficult to recover, and will deteriorate the subsequent flotation environment, resulting in difficulty in recovering minerals of 10-38 microns, the utility model first uses a cyclone classifier to partially or completely separate the minerals (sludge) with a particle size of less than 10 microns, and the remaining ore enters the flotation column for flotation after slurry adjustment. Under the cyclone classification effect of the cyclone classifier and the flotation effect of the flotation column, the comprehensive recovery rate of fine-grained phosphate minerals (particle size is less than or equal to 38 μm) is improved.

[0020] 2. The flotation column of the utility model includes a column flotation section, a cyclone separation section and a slurry circulation structure, so that the iron ore tailings after cyclone classification can undergo multiple cycles of separation in the flotation column again, thereby achieving efficient recovery of fine-grained phosphate minerals in the iron ore tailings.

[0021] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can be obvious from the description or understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0023] Figure 1 The utility model discloses a device for separating fine phosphate minerals from iron ore tailings.

[0024] Reference numerals:

[0025] 1-cyclone classification device; 2-slurry mixing device; 3-flotation column; 4-microbubble generator; 5-first feed pump; 6-feed inlet; 7-foam collection tank; 8-tailings discharge port; 9-circulating slurry inlet; 10-circulating slurry outlet; 11-circulating pump; 12-second feed pump; 13-discharge pump;

[0026] A- iron ore tailings; B- classification overflow; C- classification underflow; D- flotation foam; E- circulating slurry; F- flotation tailings. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0028] The utility model provides a device for separating fine-grained phosphate minerals from iron ore tailings. Figure 1 As shown, the device comprises a cyclone classification device 1, a slurry conditioning device 2 and a flotation column 3 which are connected in sequence;

[0029] The pulping device 2 is located between the cyclone classification device 1 and the flotation column 3, the lower end outlet of the cyclone classification device 1 is connected to the inlet of the pulping device 2, and the outlet of the pulping device 2 is connected to the feed inlet 6 of the flotation column 3;

[0030] The cyclone classification device 1 is used to perform cyclone classification on iron ore tailings;

[0031] The slurry mixing device 2 is a mixing device for mixing the classification underflow of the cyclone classification device 1 with the flotation reagent.

[0032] During implementation, the iron ore tailings A enter the cyclone classification device 1 for cyclone classification treatment, and the minerals (slime) with a particle size of less than 10 microns are discharged in the form of classification overflow B. The remaining mineral materials enter the slurry mixing device 2 in the form of classification underflow C, and after being mixed with the flotation agent in the slurry mixing device 2, they enter the flotation column 3 for flotation. The fine-grained phosphate minerals float up and are discharged along with the bubbles, thereby floating out the fine-grained phosphate minerals.

[0033] Compared with the prior art, the utility model combines a cyclone classifier with a flotation column. Since minerals with a particle size of less than 10 microns are basically at the sludge level and are difficult to recover, and will deteriorate the subsequent flotation environment, resulting in difficulty in recovering minerals of 10-38 microns, the utility model first uses a cyclone classifier to partially or completely separate the minerals (sludge) with a particle size of less than 10 microns, and the remaining ore is slurried and then enters the flotation column for flotation. Under the cyclone classification effect of the cyclone classifier and the flotation effect of the flotation column, the comprehensive recovery rate of fine-grained phosphate minerals is improved.

[0034] Exemplarily, the iron ore tailings are fine-grained iron ore tailings or fine-grained iron ore tailings after the coarse and medium-grained phosphate minerals are recovered by the existing coarse separation-inclined plate thickening desludging-flotation device.

[0035] Exemplarily, a first feed pump 5 is provided between the cyclone classifying device 1 and the slurry mixing device 2 , and the first feed pump 5 is used to pump the classification underflow C from the cyclone classifying device 1 into the slurry mixing device 2 .

[0036] Exemplarily, a second feed pump 12 is provided between the pulp mixing device 2 and the flotation column, and the second feed pump 12 is used to pump a mixture of ore pulp and flotation reagent from the pulp mixing device 2 into the flotation column 3 .

[0037] In order to evenly mix the ore pulp and the flotation reagent in the pulp mixing device 2, a stirring component is provided in the pulp mixing device 2.

[0038] Exemplarily, a foam collecting tank 7 is provided at the top of the flotation column 3. The foam collecting tank 7 is used to collect and discharge bubbles containing fine-grained phosphate minerals floating from the flotation column 3, namely, flotation foam D, which contains fine-grained phosphate minerals.

[0039] Specifically, the flotation column 3 includes a column flotation section and a cyclone separation section which are connected from top to bottom, and the feed inlet 6 is located in the column flotation section.

[0040] Furthermore, the feed inlet 6 is arranged at one end of the column flotation section close to the foam collecting tank 7 .

[0041] Exemplarily, the cyclone separation section is provided with a slurry circulation device.

[0042] Exemplarily, the slurry circulation device includes a circulating slurry outlet 10, a circulating slurry inlet 9, a circulating pump 11 and a microbubble generator 4. The circulating slurry outlet 10 is arranged at the bottom of the flotation column 3, and the circulating slurry inlet 9 is arranged at the connection between the column flotation section and the cyclone separation section. The circulating slurry outlet 10 is connected to the circulating slurry inlet 9, and the circulating pump 11 and the microbubble generator 4 are sequentially arranged between the circulating slurry outlet 10 and the circulating slurry inlet 9 along the material flow direction. The circulating slurry from the bottom of the flotation column 3 is discharged through the circulating slurry outlet 10, passes through the circulating pump 11 and the microbubble generator 4 in sequence, and then returns to the flotation column 3. The circulating slurry E that has not completed mineralization and flotation is subjected to multiple cyclone separations and column flotation in the flotation column 3, so as to achieve efficient recovery of fine-grained phosphate minerals in the iron ore tailings.

[0043] Exemplarily, a tailings discharge port 8 is provided at the bottom of the flotation column 3. The tailings (flotation tailings F) remaining after column flotation and cyclone separation are discharged through the tailings discharge port 8.

[0044] Furthermore, a discharge pump 13 is provided on the pipeline where the tailings discharge port 8 is located.

[0045] When the device of the utility model is used to separate fine-grained phosphate minerals from iron ore tailings, the iron ore tailings A enters the cyclone classification device 1, and is divided into a classification overflow B containing ore particles and ore mud below 10 microns and a classification underflow C containing the remaining ore pulp through the cyclone separation action, thereby achieving the classification and desludging of the iron ore tailings slurry. The classification overflow B is discharged, and the classification underflow C enters the slurry mixing device 2 through the first feeding pump 5. The ore pulp is mixed and interacted with the flotation reagent in the slurry mixing device 2. The ore pulp after the mixing action enters the feeding inlet 6 on the upper part of the flotation column 3 through the second feeding pump 12, and then enters the flotation column 3. After the air enters the microbubble generator 4, microbubbles are generated by the jet negative pressure generated by the circulating slurry E. The fine particles in the slurry collide with the microbubbles to realize pipe flow mineralization. The mineralized particles float with the bubbles in the column flotation area and enter the foam collection tank 7 to become concentrate products. The incompletely mineralized particles pass through the circulation pump 11 in the cyclone flotation area of ​​the flotation column to complete the mineralization process through multiple circulation operations, and then enter the column flotation area and are enriched in the foam collection tank 7. The flotation tailings F are discharged through the tailings discharge port 8 at the bottom of the flotation column through the discharge pump 13, thereby realizing the efficient recovery of fine-grained phosphate minerals in the iron ore tailings.

[0046] The following is a further explanation of the device for separating fine-grained phosphate minerals from iron ore tailings of the present invention through specific embodiments.

[0047] Example 1

[0048] This embodiment provides a device for separating fine-grained phosphate minerals from iron-separated tailings, the device comprising a cyclone classification device 1, a slurry mixing device 2 and a flotation column 3 which are connected in sequence, the slurry mixing device 2 being located between the cyclone classification device 1 and the flotation column 3, the lower end outlet of the cyclone classification device 1 being connected to the inlet of the slurry mixing device 2, the outlet of the slurry mixing device 2 being connected to the feed inlet 6 of the flotation column 3; the cyclone classification device 1 is used for cyclone classification of iron-separated tailings; the slurry mixing device 2 is a mixing device for the classification bottom flow of the cyclone classification device 1 and the flotation reagent. A first feed pump 5 is arranged between the cyclone classification device 1 and the slurry mixing device 2, a second feed pump 12 is arranged between the slurry mixing device 2 and the flotation column, and a stirring assembly is arranged in the slurry mixing device 2. A foam collecting tank 7 is arranged at the top of the flotation column 3. The flotation column 3 comprises a column flotation section and a cyclone separation section which are connected from top to bottom, and the feed inlet 6 is located in the column flotation section. The feed inlet 6 is arranged at one end of the column flotation section near the foam collecting tank 7. The cyclone separation section is provided with a pulp circulation device. The pulp circulation device comprises a circulating pulp outlet 10, a circulating pulp inlet 9, a circulating pump 11 and a microbubble generator 4. The circulating pulp outlet 10 is arranged at the bottom of the flotation column 3, and the circulating pulp inlet 9 is arranged at the connection between the column flotation section and the cyclone separation section. The circulating pulp outlet 10 is communicated with the circulating pulp inlet 9, and the circulating pump 11 and the microbubble generator 4 are sequentially arranged between the circulating pulp outlet 10 and the circulating pulp inlet 9 along the material flow direction. A tailings discharge port 8 is arranged at the bottom of the flotation column 3. A discharge pump 13 is arranged on the pipeline where the tailings discharge port 8 is located.

[0049] Comparative Example 1

[0050] This comparative example provides a device for separating fine phosphate minerals from iron ore tailings similar to that of Example 1, except that a conventional flotation machine is used instead of a flotation column.

[0051] The devices of Example 1 and Comparative Example 1 were used to separate fine-grained phosphate minerals from iron ore tailings. The iron ore tailings were from Chengde Jinying Mining Co., Ltd. The iron ore tailings were fine-grained minerals (average particle size D 50 About 15μm), phosphorus grade is (P 2 O 5 ) 2.34%, and the flotation reagents used are shown in Table 1. The concentrate P after separation by the devices of Example 1 and Comparative Example 1 2 O 5 The grade and recovery rate are shown in Table 1.

[0052] Table 1

[0053]

[0054] It can be seen from Table 1 that the device of the utility model can be used to separate fine phosphate minerals from iron ore tailings to obtain P 2 O 5 The phosphorus recovery rate of the phosphate concentrate with a grade of 26.83% can reach 82.60%. Compared with the separation index of the device combining the traditional flotation machine and the cyclone classification under the same conditions, the phosphorus recovery rate of the concentrate is 26.83%. 2 O 5 The grade increased by 11.35%, P 2 O 5 The recovery rate increased by 21.82%.

[0055] The above is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A device for separating fine phosphate minerals from iron ore tailings, characterized in that: The device comprises a cyclone classification device, a slurry mixing device and a flotation column which are connected and arranged; The slurry mixing device is located between the cyclone classification device and the flotation column, the lower end outlet of the cyclone classification device is connected to the inlet of the slurry mixing device, and the outlet of the slurry mixing device is connected to the feed inlet of the flotation column; The cyclone classification device is used to perform cyclone classification treatment on iron ore tailings; The slurry mixing device is a mixing device for mixing the classification underflow of the cyclone classification device with the flotation reagent.

2. The device according to claim 1, characterized in that A foam collecting tank is arranged at the top of the flotation column.

3. The device according to claim 2, characterized in that The flotation column comprises a column flotation section and a cyclone separation section which are connected from top to bottom, and the feed inlet is located in the column flotation section.

4. The device according to claim 3, characterized in that The cyclone separation section is provided with a slurry circulation device.

5. The device according to claim 4, characterized in that The slurry circulation device comprises a circulating slurry outlet, a circulating slurry inlet, a circulating pump and a microbubble generator. The circulating slurry outlet is arranged at the bottom of the flotation column, the circulating slurry inlet is arranged at the connection between the column flotation section and the cyclone separation section, the circulating slurry outlet is communicated with the circulating slurry inlet, and a circulating pump and a microbubble generator are sequentially arranged between the circulating slurry outlet and the circulating slurry inlet along the material flow direction.

6. The device according to any one of claims 1 to 5, characterized in that A first feeding pump is arranged between the cyclone classification device and the slurry mixing device.

7. The device according to any one of claims 1 to 5, characterized in that A second feed pump is arranged between the slurry adjusting device and the flotation column.

8. The device according to any one of claims 1 to 5, characterized in that A tailings discharge port is arranged at the bottom of the flotation column.

9. The device according to claim 8, characterized in that A discharge pump is arranged on the pipeline where the tailings discharge port is located.

10. The device according to any one of claims 1 to 5, characterized in that A stirring component is arranged in the slurry mixing device.

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