System for extracting mica from iron separation tailings to produce machine-made sand and improving iron recovery

Abstract

The utility model discloses a system for extracting mica from iron dressing tailings to produce machine-made sand and improving iron recovery, which comprises a high-pressure roller mill, a wet screening machine, a coarse grain tailing discarding magnetic separator, a cyclone I and an ultra-pulse machine which are connected in sequence, wherein the ultra-pulse machine is respectively connected with a cyclone II and a low-intensity magnetic separator III; the cyclone II is connected with the high-frequency dewatering screen I; the low-intensity magnetic separator III is connected with the high-frequency dewatering screen II; the device has the advantages that effective components such as mica of the tailings I can be recovered, and the tailings I are recovered by the cyclone I, the super-pulse machine and the magnetic separator to obtain low-grade concentrate with higher iron content, so that the recovery rate of the iron is improved.

Description

Technical Field

[0001] This utility model relates to the field of mining technology, specifically a tailings extraction system. Background Technology

[0002] In the mining and refining technology of boron-iron ore, the ore is first crushed by a high-pressure roller mill. The discharge from the high-pressure roller mill is mixed with water to form a slurry. The slurry is then screened by a wet screening machine. The coarse particles on the screen are mixed with the raw material and sent back to the high-pressure roller mill for crushing. The slurry that has passed through the screen undergoes coarse-grained tailings magnetic separation to discard gangue minerals containing surrounding rocks as tailings I. Tailings I, as a by-product, is generally only used as building materials or discarded. This inevitably wastes the useful components of tailings I, such as mica. Utility Model Content

[0003] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a system for improving iron recovery by extracting mica from iron tailings to produce manufactured sand, comprising a high-pressure roller mill, a wet screening machine, a coarse-grained tailings magnetic separator, a hydrocyclone 1, and an ultra-pulse separator connected in sequence; the ultra-pulse separator is connected to a hydrocyclone 2 and a weak magnetic separator 3 respectively; the hydrocyclone 2 is connected to a high-frequency dewatering screen 1; and the weak magnetic separator 3 is connected to the high-frequency dewatering screen 2.

[0004] Tailings are mixed with water after being pressed by a high-pressure roller mill and then enter a wet screening machine. The coarse particles on the wet screening machine are mixed with the raw material and conveyed back to the high-pressure roller mill for pressing. The slurry that passes through the screen enters a coarse tailings magnetic separator. The waste from the coarse tailings magnetic separator enters a hydrocyclone 1. The overflow from the hydrocyclone 1 enters a fine particle gravity separation process to recover uranium concentrate. The underflow from the hydrocyclone 1 enters an ultra-fine particle gravity separator. The underflow from the ultra-fine particle gravity separator enters a weak magnetic separator 3 to obtain low-grade concentrate and tailings IV.

[0005] The overflow from the super-pulse machine is deslimed and classified by a hydrocyclone II. The slurry is then dewatered by a high-frequency dewatering screen I to obtain mica as the oversize product, while the undersize material enters the gravity separation tailings system.

[0006] Furthermore, this utility model is effectively combined with the boron iron concentrate preparation system, and also includes a closed-circuit mill I, a weak magnetic separator I, a closed-circuit mill II, a weak magnetic separator II and a filter connected in series with the coarse particle tailing magnetic separator.

[0007] The minerals left by the coarse-grained tailings magnetic separator are used as magnetic concentrate I, which is then ground once by a closed-circuit mill to control the particle size of the output product to -74μm content of 50-55%.

[0008] The above products are passed through a weak magnetic separator to obtain magnetic concentrate II and tailings II. The magnetic concentrate II is fed into a closed-circuit mill II, and the particle size of the output product is controlled to have a content of -74μm of 90%.

[0009] The product obtained in the previous step is further refined by a weak magnetic separator to obtain magnetic concentrate III and tailings III. The magnetic concentrate III is then filtered to produce boron-iron concentrate.

[0010] The tailings IV are dewatered by a high-frequency dewatering screen II to obtain the oversize product, manufactured sand, while the undersize material is fed into a fine sand gravity separation process to recover uranium concentrate.

[0011] The high-frequency dewatering screen is a linear screen.

[0012] Uranium concentrate was recovered by the fine mud gravity separation process of tailings III.

[0013] The advantages of this invention are: it can recover the effective components of tailings I, such as mica, and because tailings IV has a high iron content, it improves the iron recovery rate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the device connection of this utility model;

[0015] Figure 2 This is a schematic diagram of the present invention;

[0016] In the diagram, 1 is a high-pressure roller mill, 2 is a wet screening machine, 3 is a coarse-grained tailings magnetic separator, 4 is a closed-circuit mill I, 5 is a weak magnetic separator I, 6 is a closed-circuit mill II, 7 is a weak magnetic separator II, 8 is a filter, 9 is a hydrocyclone I, 10 is an ultra-pulse mill, 11 is a hydrocyclone II, 12 is a weak magnetic separator III, 13 is a high-frequency dewatering screen I, 14 is a high-frequency dewatering screen II, and 15 is a gravity separation tailings system. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings. As shown in the drawings, the present invention includes a high-pressure roller mill 1, a wet screening machine 2, a coarse particle tailing magnetic separator 3, a hydrocyclone 9, and an ultra-pulse separator 10 connected in sequence. The ultra-pulse separator is connected to a hydrocyclone 11 and a weak magnetic separator 12, respectively. The hydrocyclone 1 is connected to a high-frequency dewatering screen 13. The weak magnetic separator 12 is connected to a high-frequency dewatering screen 14.

[0018] Furthermore, this utility model is effectively combined with the boron iron concentrate preparation system, and also includes a closed-circuit mill 4, a weak magnetic separator 5, a closed-circuit mill 6, a weak magnetic separator 7 and a filter 8 connected in sequence.

[0019] The method of using this utility model is as follows:

[0020] (1) The crushed 12-0mm raw material is fed into a high-pressure roller mill for rolling. The discharge from the high-pressure roller mill is mixed with water to become a slurry. The slurry is fed into a wet screening machine. The coarse particles on the screen are mixed with the raw material and then sent to the high-pressure roller mill for rolling. The slurry that passes through the screen is an ultra-fine crushed product and is sent to the next process.

[0021] (2) The slurry from step (1) is subjected to coarse tailings magnetic separation. The gangue minerals containing the surrounding rock are discarded as tailings I, and the remainder is the selected magnetic concentrate I, which is sent to the next process.

[0022] (3) The magnetic concentrate I selected in step (2) is ground once through a closed-circuit mill to control the particle size of the output product to -74μm and the content to be 50-55%.

[0023] (4) The product obtained in step (3) is subjected to a weak magnetic separator to obtain magnetic concentrate II and tailings II. The magnetic concentrate II is fed into a closed-circuit mill II process, and the tailings II are fed into a fine sand gravity separation process to recover uranium concentrate.

[0024] (5) Grind the magnetic concentrate II obtained in step (4) through a closed-circuit mill II system to control the particle size of the output product to -74μm content to 90%.

[0025] The product obtained in step (5) is selected by a weak magnetic separator to obtain magnetic concentrate III and tailings III. The magnetic concentrate III is filtered by a filter to produce boron-iron concentrate.

[0026] (6) The tailings III are fed into the fine mud gravity separation process to recover uranium concentrate;

[0027] (8) The tailings I are deslimed and classified by hydrocyclone I. The slurry I is sent to the next process, and the overflow enters the fine particle gravity separation process to recover uranium concentrate.

[0028] (9) The slurry I is processed by an ultrasonic pulse machine and a combined ultrasonic and magnetic gravity beneficiation method with a strong weak magnetic field and a high gradient pulse to obtain underflow slurry II and overflow slurry III.

[0029] (10) The slurry II is further refined by a weak magnetic separator II to obtain low-grade concentrate and tailings IV, thereby improving iron recovery;

[0030] (11) The tailings IV are dewatered by high frequency dewatering screen II to obtain the oversize product manufactured sand, and the undersize material is fed into the fine sand gravity separation process to recover uranium concentrate.

[0031] (12) The slurry III is deslimed and classified by hydrocyclone II, and the sand slurry is dewatered by high frequency dewatering screen I to obtain mica product on the screen. The undersize material enters the gravity separation tailings system, and part of the overflow is recycled to the magnetic separator for use.

[0032] The ultra-pulse separator used in this invention is a weak magnetic gravity separation device. It utilizes a combined magnetic and gravity beneficiation method, leveraging the characteristic of generating a longitudinal gradient pulsed weak magnetic field within the separation zone using electromagnetic fields. This, combined with the repeated magnetic agglomeration and dispersion of magnetic flux and the gravity separation effect in the dense phase layer, improves the separation efficiency of magnetic iron ore. Examples include products from Beijing Chuangnuowei Technology Co., Ltd.

[0033] In addition, other equipment, such as weak magnetic separator I, weak magnetic separator II, weak magnetic separator III, hydrocyclone I, hydrocyclone II, high-pressure roller mill, wet screening machine, etc., can all use commercially available products.

Claims

1. A system for improving iron recovery by extracting mica from iron tailings to produce manufactured sand, characterized by: The system includes a high-pressure roller mill, a wet screening machine, a coarse particle tailing magnetic separator, a hydrocyclone 1, and an ultra-pulse separator, which are connected in sequence. The ultra-pulse separator is connected to a hydrocyclone 2 and a weak magnetic separator 3, respectively. The hydrocyclone 2 is connected to a high-frequency dewatering screen 1, and the weak magnetic separator 3 is connected to the high-frequency dewatering screen 2. It also includes a closed-circuit mill I, a weak magnetic separator I, a closed-circuit mill II, a weak magnetic separator II, and a filter, which are connected in series with the coarse-grained tailings magnetic separator.

2. The iron recovery system for extracting mica from iron tailings to produce manufactured sand according to claim 1, characterized in that: All high-frequency dewatering screens are linear screens.

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