Adjustable crystalline graphite column special foam separation device and foam separation method

Abstract

Adjustable crystalline graphite column flotation special foam separation device and foam separation method. The present invention comprises: a hollow column, a hollow shaft sleeve on the hollow column; a gear mounted on the hollow column; a speed regulating motor driving a transmission gear to rotate via a pulley, the transmission gear meshing with the gear; two foam scraping blades are plate-like structures with a transverse axis having a certain curvature and deflection angle, the blade section line corresponding to each radius has a different angle with the flotation column axis, the blade installation end edge and the tail end edge of the foam scraping blade have a certain inclination angle, and the foam scraping blade is mounted on the hollow shaft along the tangent direction; the ore separator is mounted on the lower part of the hollow column. The present invention can compensate for the disadvantage of poor crystalline graphite foam flow, achieve timely recovery of concentrate foam by applying external force, and improve the crystalline graphite flotation column separation recovery rate and equipment operating stability.

Description

Technical field:

[0002] The invention relates to an adjustable foam separation device and a foam separation method for selecting crystalline graphite columns. Background technology:

[0004] Crystalline graphite, also known as flake graphite, has excellent physical, chemical and mechanical properties, high utilization value, and is recognized as a strategic resource. Its surface is highly hydrophobic and is generally initially purified by flotation. In industrial production, it is often re-ground and refined 7 to 12 times. It has disadvantages such as long process flow, unstable production, high cost, and complicated plant layout.

[0005] In recent years, more and more research has been conducted on the application of flotation columns in the separation of crystalline graphite, and a combined flotation process of machine + column has emerged. Most data show that the use of flotation columns instead of flotation machines in crystalline graphite flotation operations has obvious advantages in improving concentrate grade and shortening process flow. However, the flotation of crystalline graphite by flotation columns has disadvantages such as low recovery rate and unstable equipment operation. The fundamental reason is that the graphite mineral itself is highly hydrophobic, and the mineralized foam easily forms chain-like and agglomerated aggregates. The foam has poor laminar flow and cannot be discharged in time. It accumulates on the overflow surface of the flotation column to form a "dome cover", which in turn affects the normal operation of the flotation column. Especially in large-diameter industrial equipment, the central foam overflow path is longer, and this phenomenon becomes more serious, thus limiting the large-scale promotion and application of flotation columns in crystalline graphite mines. Summary of the invention:

[0007] The purpose of the present invention is to provide an adjustable crystalline graphite column flotation special foam separation device and foam separation method, which can timely discharge the foam accumulated on the overflow surface, improve the mineral processing recovery rate and the working stability of the flotation column.

[0008] The above purpose is achieved through the following technical solutions:

[0009] An adjustable foam separation device for selecting crystalline graphite columns, comprising:

[0010] A hollow column, with a hollow shaft sleeved on the hollow column;

[0011] a gear, the gear being mounted on the hollow column;

[0012] A speed regulating motor, wherein the speed regulating motor drives a transmission gear to rotate via a pulley, and the transmission gear is engaged with the gear;

[0013] 2 bubble scraping blades, each bubble scraping blade is a plate-like structure with a certain curvature and deflection angle on its transverse axis, the curvature is 20-50 degrees, the deflection angle is 60-80 degrees, the angle between the blade section line corresponding to each radius and the axis of the flotation column is different, the blade mounting end edge and the tail end edge of the bubble scraping blade are at a certain inclination angle of 60-80 degrees, and the bubble scraping blade is installed on the hollow shaft along the tangent direction;

[0014] An ore separator is installed at the lower part of the hollow column.

[0015] The adjustable crystalline graphite column is a special foam separation device, and the hollow shaft is provided with a group of reserved bolts of different heights for adjusting the height of the foam scraping blades.

[0016] The adjustable crystalline graphite column is equipped with a special foam separation device, and the bottom edge scanning surface of the foam scraping blade is an arc surface.

[0017] The adjustable crystalline graphite column is specially used for froth separation, and the froth scraping blade rotates along the axis of the flotation column, and the rotation direction is the convex side of the blade.

[0018] The adjustable crystalline graphite column is a special foam separation device, and the two foam scraping blades are 180° rotationally symmetrical about the center of the flotation column.

[0019] The adjustable crystalline graphite column is a special foam separation device, and the bottom edge scanning surfaces of the two foam scraping blades are the same curved surface.

[0020] The adjustable crystalline graphite column is equipped with a special foam separation device. During the rotation of the foam scraping blade along the hollow shaft, the horizontal section line of the tail end thereof is always tangent to the overflow surface radius of the flotation column when viewed from above.

[0021] The adjustable crystalline graphite column is equipped with a special foam separation device, and the hollow column is installed on a load-bearing beam.

[0022] The adjustable crystalline graphite column is equipped with a special foam separation device, and the speed regulating motor is installed on a load-bearing beam.

[0023] The adjustable crystalline graphite column is equipped with a special foam separation device, and the load-bearing beam is welded to the top of the flotation column.

[0024] A foam separation method using the adjustable crystalline graphite column selection foam separation device as described in one of claims 1 to 9, wherein a speed regulating motor drives a pulley and a transmission gear, and the transmission gear drives the gear to rotate, so that the hollow shaft drives the foam scraping blade to rotate, driving the foam to move toward the overflow edge. The foam scraping blade rotates along the axis of the flotation column, and the rotation direction is the convex side of the blade; its bottom edge scanning surface is an arc surface, and the blade surface promotes the movement of foam to the overflow edge through the "driving + lifting" effect.

[0025] Beneficial effects of the present invention:

[0026] In addition to having a certain curvature, the foam scraping blade of the present invention has a different angle between the blade section line corresponding to each radius and the flotation column axis, that is, the blade root edge axis and the tail edge axis are at a certain inclination angle, which can drive the foam to move toward the overflow edge to prevent the foam from accumulating in the center of the overflow surface, and can also lift the overflow edge foam to prevent the foam from accumulating around the overflow after gathering.

[0027] The installation height and rotation speed of the bubble scraping blade of the present invention can be adjusted, and the bubble scraping depth and speed can be matched according to production requirements.

[0028] The foam separation device of the present invention is provided with a hollow column reserved for feeding ore, and all components are installed on a load-bearing beam. It is an independent system and can be easily installed on any type of flotation column and is convenient for modification.

[0029] The separation device of the present invention can make up for the shortcoming of poor fluidity of crystalline graphite foam, realize timely recovery of concentrate foam by applying external force, and improve the separation recovery rate of the crystalline graphite flotation column and the working stability of the equipment. Description of the drawings:

[0031] Attachment Figure 1 It is a structural schematic diagram of the present invention.

[0032] Attachment Figure 2 It is attached Figure 1 Top view (speed regulating motor rotates 90 degrees clockwise).

[0033] Attachment Figure 3 It is a structural schematic diagram of the bubble scraping blade of the present invention.

[0034] Attachment Figure 4 It is attached Figure 3 Left view of .

[0035] Attachment Figure 5 It is attached Figure 3 Top view of . Specific implementation method:

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0038] Example 1:

[0039] The present invention provides an adjustable foam separation device for selecting crystalline graphite columns, such as Figure 1 、 Figure 2 、 Figure 3 As shown. The flotation column is used in the flotation process of crystalline graphite, which has the advantages of significantly shortening the process flow and improving the concentrate grade; after the mineralized foam in the column rises, a foam layer is formed on the overflow surface, which flows evenly from the center to the surroundings, jumps over the overflow edge and enters the concentrate collection tank. However, crystalline graphite has extremely strong hydrophobic aggregation. After its mineralized foam rises to the overflow surface, it breaks and merges, often forming chain-like and agglomerated aggregates. The foam layer has poor flow state and accumulates on the overflow surface of the flotation column to form a "dome cover", which cannot be discharged in time, causing the target mineral to stay in the flotation column and float repeatedly, affecting normal production and use. To address this phenomenon, a foam separation device can be installed on the top of the flotation column to discharge the foam accumulated on the overflow surface in time. As shown Figure 1 As shown, the speed regulating motor 10 drives the pulley 9 and the transmission gear 8 to transmit, and the transmission gear 8 drives the gear 6 to rotate, so that the hollow shaft 7 drives the foam scraping blade 3 to rotate, driving the foam to move toward the overflow edge.

[0040] Two of the scraping blades 3 are plate-shaped structures with a certain curvature and deflection angle (the curvature is between 20-50 degrees and the deflection angle is between 60-80 degrees) on the transverse axis;

[0041] like Figure 3 As shown, the angles between the blade section line corresponding to each radius and the axis of the flotation column 2 are different, that is, the blade installation end edge and the tail end edge have a certain deflection angle (the deflection angle is between 60-80 degrees); the curvature of the transverse axis and the deflection angle of the bubble scraping blade 3 have a certain influence on the flotation index of crystalline graphite.

[0042] In practical applications, its value can be appropriately adjusted according to the application of the flotation column. Generally, roughing and scavenging operations require a large curvature and deflection angle (curvature between 40-50 degrees, deflection angle between 70-80 degrees) to increase the foam load of blade 3, increase the foam output per unit time, and reduce the target mineral tailings loss rate; for concentrating operations, especially the final concentrating operation, the curvature and deflection angle of the blade 3 axis should be appropriately reduced to improve the grade of the foam product.

[0043] The foam scraping blade 3 rotates along the axis of the flotation column, with the direction of rotation pointing to the convex side of the blade 3, and the bottom edge scanning surface of the blade 3 is an arc-shaped surface; when in contact with the foam, a force is generated on the foam, and the force on the side of the blade 3 close to the hollow shaft 7 is mainly in a "driving" manner, pushing the foam to move toward the edge of the overflow surface of the flotation column; the force on the side of the blade 3 close to the overflow surface is mainly in a "lifting" manner, assisting the foam to jump over the overflow edge of the flotation column and be collected in the foam tank, preventing the foam from accumulating at the edge of the overflow surface; thereby realizing the foam separation and collection process, improving the phenomenon of foam accumulation and non-flow during crystalline graphite column selection, and improving flotation efficiency.

[0044] The foam scraping blade 3 is rotated by a speed-regulating motor 10. The speed-regulating motor 10 drives a pulley 9 via a V-belt. The pulley 9 and the transmission gear 8 are coaxially mounted vertically, and both rotate at the same angular velocity. The transmission gear 8 meshes with the gear 6, and the two are on the same horizontal plane. The gear 6 is mounted on a hollow shaft 7. The hollow shaft 7 is sleeved on the outside of the hollow column 5 and rotates around it, thereby driving the blade 3 to rotate.

[0045] The foam scraping blade 3 is installed on the hollow shaft 7 with the gear 6 along the tangential direction to reduce the foam driving dead angle in the center of the overflow surface as much as possible.

[0046] Example 2:

[0047] The present invention provides an adjustable foam separation device for selecting crystalline graphite columns, as shown in the attached Figure 2 As shown, the lower edge of the tail end of blade 3 is on the same horizontal plane as the edge of the flotation column overflow surface. The straight-line distance from the mounting end to the tail end of blade 3 is 0.8-0.9 times the radius of the flotation column overflow surface, and the vertical width of blade 3 is 0.5-0.8 times the thickness of the foam layer. The foam scraping blade 3 is mounted tangentially on a hollow shaft 7 equipped with a gear 6. The hollow shaft 7 has multiple reserved bolts for adjusting the height of the foam scraping blade 3.

[0048] The two bubble scraping blades 3 are rotationally symmetrical at 180° with respect to the center of the flotation column 2 , and ensure that the bottom edge scanning surfaces of the two bubble scraping blades are the same curved surface.

[0049] An ore separator 4 is installed at the lower part of the hollow column 5. The hollow column 5 has the function of conveying slurry to meet the requirement of stable ore feeding in the center of the flotation column.

[0050] All the components are directly or indirectly mounted on the load-bearing beam 1 and have no connection with the flotation column itself. The load-bearing beam 1 is made of I-steel and welded to the top of the flotation column 2 foam collection tank, which is convenient for installation, replacement and modification.

[0051] Example 3:

[0052] This invention provides an adjustable foam separation device specifically designed for crystalline graphite column flotation. Experimental comparisons were conducted using an SF flotation machine, an FCSMC flotation column (self-overflowing foam), an FCSMC flotation column (linear foam scraping plate), an FCSMC flotation column (arc-shaped foam scraping blades), and an FCSMC flotation column (blades described in this patent). (Note: The different blade types were attached to the hollow shaft described in this patent. During the comparative tests, the rotational speed, foam penetration depth, and contact area between the lower blade edge and the foam during rotation were identical.) The flotation performance of the same material under the same experimental conditions was evaluated. The test ore had a fixed carbon content of 91.5%, kerosene was used at a rate of 25 g / t, and No. 2 oil was used at a rate of 13 g / t. Open-circuit flotation was performed. Each test was conducted continuously for 24 hours, with samples collected every four hours for a total of six times. The average of the six test results was used for comparison. The test results are shown in Table 1.

[0053] Table 1 Comparison of flotation indicators in 24h continuous test

[0054]

[0055] It can be seen that when the flotation column is used in crystalline graphite flotation operations, no matter which type of scraper blades are installed, its flotation index is better than that when the flotation column is self-overflowing with foam, and the concentrate recovery rate is 10-20 percentage points higher; when the fixed carbon content of the concentrate reaches the standard of high-carbon products (fixed carbon content ≥94%, GB / T 3518), the flotation column equipped with the foam separation device described in this patent can achieve a concentrate recovery rate about 5 percentage points higher than when other types of scraper blades are installed.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An adjustable foam separation device for crystalline graphite column selection, characterized in that: include: A hollow column (5), wherein the hollow shaft (7) is sleeved on the hollow column (5); A gear (6), the gear (6) being mounted on the hollow column (5); A speed regulating motor (10), wherein the speed regulating motor (10) drives a transmission gear (8) to rotate via a pulley (9), and the transmission gear (8) is meshed with the gear (6); Two bubble scraping blades (3), the bubble scraping blades (3) are plate-shaped structures with a transverse axis having a certain curvature and a deflection angle, the curvature being 20-50 degrees, the deflection angle being 60-80 degrees, the angles between the blade section line corresponding to each radius and the axis of the flotation column (2) being different, the blade mounting end edge and the tail end edge of the bubble scraping blade (3) having a certain deflection angle, the deflection angle being 60-80 degrees, and the bubble scraping blade (3) being mounted on the hollow shaft (7) along a tangential direction; A separator (4), the separator (4) being installed at the lower part of the hollow column (5); The hollow shaft (7) is provided with a set of reserved bolts of different heights for adjusting the height of the scraping blade (3); The bottom edge scanning surface of the scraping blade (3) is an arc-shaped surface; The foam scraping blade (3) rotates along the axis of the flotation column, and the rotation direction is the convex side of the blade, and a force is generated on the foam when it contacts the foam. The force on the side of the blade (3) close to the hollow shaft (7) is mainly in a driving manner, pushing the foam to move toward the edge of the overflow surface of the flotation column; the force on the side of the blade (3) close to the overflow surface is mainly in a lifting manner, assisting the foam to jump over the overflow edge of the flotation column and be collected in the foam tank, thereby preventing the foam from accumulating at the edge of the overflow surface. The lower bottom edge of the tail end of the blade (3) and the edge of the overflow surface of the flotation column are on the same horizontal plane.

2. The adjustable foam separation device for selecting crystalline graphite columns according to claim 1 is characterized in that: The two bubble scraping blades (3) are 180° rotationally symmetrical about the center of the flotation column (2).

3. The adjustable foam separation device for selecting crystalline graphite columns according to claim 2 is characterized in that: The bottom edge scanning surfaces of the two bubble scraping blades (3) are the same curved surface.

4. The adjustable foam separation device for crystalline graphite column selection according to claim 3 is characterized in that: During the rotation of the bubble scraping blade (3) along with the hollow shaft (7), the horizontal cross-section line of the tail end thereof is always tangent to the overflow surface radius of the flotation column (2) when viewed from above.

5. The adjustable foam separation device for crystalline graphite column selection according to claim 4 is characterized in that: The hollow column (5) is installed on the load-bearing beam (1).

6. The adjustable foam separation device for crystalline graphite column selection according to claim 5 is characterized in that: The speed regulating motor (10) is mounted on a load-bearing beam (1), and the load-bearing beam (1) is welded to the top of the flotation column (2).

7. A foam separation method using the adjustable crystalline graphite column selection foam separation device according to any one of claims 1 to 6, characterized in that: The speed regulating motor (10) drives the pulley (9) and the transmission gear (8) to transmit the power, and the transmission gear (8) drives the gear (6) to rotate, so that the hollow shaft (7) drives the foam scraping blade (3) to rotate, driving the foam to move toward the overflow edge. The foam scraping blade (3) rotates along the axis of the flotation column, and the rotation direction is the convex side of the blade; the bottom edge scanning surface is an arc surface, and the blade surface promotes the foam to move toward the overflow edge through the "driving + lifting" effect.

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