Device and method for improving grade of micro-fine particle magnetite concentrate
By designing a fine-grained magnetite concentrate grade level lifting device in the iron selection process, using slope groove bottom plate, trapezoidal partition and flushing water components, the problem of desilt caused by magnetic agglomeration is solved, and the iron concentrate grade is achieved Improve and improve production efficiency.
Patent Information
- Application Number
- CN202411597201.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-02-14
AI Technical Summary
In the existing iron selection process, magnetic agglomeration phenomenon is serious, resulting in the inability of magnetic iron-wrapped impurities to effectively remove mud through conventional magnetic separation equipment, which in turn affects the improvement of iron concentrate grade.
A fine-grain magnetite concentrate grade lifting device is designed, including a mud removal tank, an overflow tank, a mud washer, a mine drainage pipeline and a flushing assembly. By setting up the sloped groove bottom plate, trapezoidal partition and flushing water components, the graded settlement and effective desilt of iron concentrate and ore mud are achieved.
It improves the desilt effect, reduces the accumulation of iron concentrate at the bottom layer, ensures the full settlement time of iron concentrate of different particle sizes, improves the concentrate grade, and improves production efficiency.
Smart Images
Figure CN119425941A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of ore dressing, and in particular to a device and method for improving the grade of micro-grained magnetite concentrate. Background Art
[0002] The embedded particle size of molybdenum tailings magnetite in the beneficiation plant is relatively fine. In order to achieve the mineral dissociation degree required for beneficiation, the fineness of the second-stage grinding of the iron ore dressing process is required to be stable at more than 90% of -400 mesh, which leads to an increase in the mud content in the slurry. These muds often have a finer particle size distribution and complex surface physical and chemical properties, making desludging more difficult. In the existing iron ore dressing operations, magnetic agglomeration is serious, and impurities such as mud in the iron concentrate slurry are wrapped by magnetic iron and cannot be desludified by conventional magnetic separation equipment. The above factors, coupled with the quality of the return water used in on-site production, directly affect the desludging effect. Improvement of the grade of the iron concentrate leads to great difficulty in improving the grade of the iron ore dressing process. Summary of the invention
[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a device and method for improving the grade of fine-grained magnetite concentrate, which can improve the desludging effect and have high production efficiency.
[0004] The technical solution adopted by the present invention is: A fine-grained magnetite concentrate grade-raising device, comprising a desludging tank, an overflow tank, a mud washer, a ore discharge pipeline and a flushing assembly; The desludging trough is a square trough, and the trough bottom plate is inclined downward from the back to the front. A number of partitions are evenly spaced between the front and rear side plates in the desludging trough. The partitions are right-angled trapezoidal plates. The sides where the upper and lower bottoms of the partition right-angled trapezoid are located are respectively connected to the rear side plate and the front side plate of the desludging trough. The horizontal straight edge of the upper end of the partition is lower than the upper end of the desludging trough, and the lower oblique edge of the partition is consistent with the inclination direction of the trough bottom plate. The height of the partition in the desludging trough is gradually reduced from left to right, so that the gap between the lower side of the partition from left to right and the trough bottom plate is gradually reduced until the rightmost partition contacts the trough bottom plate, and a number of graded sedimentation channels are formed in the desludging trough through the partitions; the front side plate and the right side plate of the desludging trough are lower in height than the rear side plate and the left side plate, forming an overflow side; the overflow trough is arranged along the overflow side, the bottom of the overflow trough is inclined, and a mud discharge pipe is arranged at the bottom; The mud washer is arranged on the front side plate of the desludging tank corresponding to the leftmost slot. The mud washer is a double-layer tube structure. Both ends of the outer tube are closed to form a sandwich with the inner tube. The outer end of the inner tube is connected to the ore feeding pipeline. Flushing holes are evenly arranged on the wall of the inner tube in the sandwich. A water supply pipe is arranged on the outer tube located outside the desludging tank. The discharge pipes are respectively arranged at the bottom of each channel except the mud washer, and gate valves are arranged on the discharge pipes. The outlets of the discharge pipes are connected to the same discharge pipe. The flushing water assembly includes a main pipe and several branch pipes. The main pipe is arranged on the left side and rear side of the desludging tank. The branch pipes are respectively arranged on the left side of the leftmost channel and at the top position of each channel. Several water outlets are evenly arranged on the branch pipes.
[0005] Specifically, the inclination angle of the trough bottom plate is 25-30°.
[0006] Specifically, a rubber pad is laid on the bottom plate of the trough.
[0007] Specifically, the diameter of the flushing hole on the inner tube of the mud washer is φ3.5-6㎜, and the water pressure of the water supply pipe is 0.2-0.6 Mpa.
[0008] A method for improving the grade of fine-grained magnetite concentrate, the specific steps are: S1: The upstream slurry delivery pipeline is connected to the outer end of the mud washer, the slurry is passed into the inner tube of the mud washer, and the flushing water is passed into the water supply pipe through a water pump. The flushing water enters the inner tube from the flushing holes on the inner tube of the mud washer to flush the slurry and then enters the leftmost channel of the desludging tank together; S2: The washed slurry continues to flow into the desludging tank. The slurry has a low density and rises in the desludging tank. The upper slurry tailings enter the overflow tank and are discharged from the mud discharge pipe. The iron concentrate falls due to its high density and is concentrated at the bottom of the desludging tank. The coarser iron concentrate first settles in the leftmost channel. The particle size of the iron concentrate in each channel on the right decreases in turn, forming a graded sedimentation. The settled iron concentrate enters the bottom discharge pipe along the inclined bottom plate of the tank and is discharged into the concentrate pool, realizing the separation of iron concentrate and sludge. S3: During the continuous operation of the desludging tank, each branch pipe of the flushing water assembly introduces flushing water into the desludging tank. The flushing water flushes the iron concentrate at the bottom of the desludging tank from the left side of the desludging tank and the top of the tank bottom plate to prevent the iron concentrate from settling and accumulating at the bottom; S4: The ore inflow into the mud washer, the discharge volume of the mud discharge pipe and the discharge volume of the ore discharge pipe are regulated by the gate valve installed on the ore discharge pipe to ensure the working balance of the desludging tank and the mud washing effect.
[0009] Due to the adoption of the above-mentioned technical solution, the present invention has the following advantages: The device and method for improving the grade of fine-grained magnetite concentrate of the present invention are as follows: the bottom plate of the desludging trough is arranged as a slope, and rubber is laid to cooperate with the flushing water component to reduce the accumulation of iron concentrate on the bottom layer; partitions are added in a gradient in the middle of the desludging trough to reduce the influence of the bottom flow slurry on the upper overflow layer when the bottom flow slurry fluctuates greatly, and the connecting gap at the bottom of the partition is gradually reduced to ensure that the iron concentrate of different particle sizes has sufficient sedimentation time; the mud washer and the ore discharge pipeline are separately arranged corresponding to each trough, and the ore intake, ore discharge and mud discharge pipeline discharge are linked to ensure the mud washing effect while improving the working efficiency of the desludging trough, the overall structure has a high degree of coordination, ensures the mud washing effect, and improves the concentrate grade. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is an overall schematic diagram of the present invention.
[0011] Figure 2 It is a schematic diagram of the location of the branch pipeline in the desludging tank of the present invention.
[0012] Figure 3 It is a perspective schematic diagram of a mud washer of the present invention.
[0013] In the figure: 1-de-sludge tank, 11-partition, 2-overflow tank, 21-sludge discharge pipe, 3-sludge washer, 31-water supply pipe, 32-flushing hole, 4-ore discharge pipe, 41-gate valve, 5-flushing assembly, 51-main pipe, 52-branch pipe. DETAILED DESCRIPTION
[0014] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments, which should not be used to limit the protection scope of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.
[0015] Combined with Figure 1-3 The device for improving the grade of fine-grained magnetite concentrate shown in the figure comprises a desludging tank 1, an overflow tank 2, a mud washer 3, a discharge pipe 4 and a flushing component 5.
[0016] The desludging trough 1 is a 1500*2500*1500mm square trough, the bottom plate of the trough is tilted downward from the back to the front, the bottom plate of the trough is at an angle of 25-30° with the horizontal bottom surface, and a rubber pad is laid on the bottom plate of the trough; two partitions 11 are evenly spaced between the front and rear side plates in the desludging trough 1, and the partition 11 is a right-angled trapezoidal plate, and the sides where the upper and lower bottoms of the right-angled trapezoid of the partition 11 are located are respectively connected to the rear side plate and the front side plate of the desludging trough 1, and the upper horizontal straight edge of the partition 11 is lower than the upper end of the desludging trough 1. The lower oblique side of the partition 11 is consistent with the inclination direction of the trough bottom plate, the partition 11 is set at a height decreasing from left to right in the desludging trough 1, a gap is left between the left partition and the trough bottom plate, and the right partition is in contact with the trough bottom plate, and three graded sedimentation channels are formed in the desludging trough 1 through the partition 11; the front side plate and the right side plate of the desludging trough 1 are lower than the rear side plate and the left side plate to form an overflow side; the overflow trough 2 is set along the overflow side, the bottom of the overflow trough 2 is inclined, and a mud discharge pipe 21 is set at the bottom.
[0017] The mud washer 3 is arranged on the front side plate of the desludging tank 1 corresponding to the leftmost groove. The mud washer 3 is a double-layer pipe structure. The sizes of the inner pipe and the outer pipe are DN150 and DN100 respectively. The two ends of the inner pipe extend out of the two ends of the outer pipe and the two ends of the outer pipe are welded and closed with the inner pipe to form a sandwich. A flange is arranged at the outer end of the inner pipe and is connected to the ore feeding pipeline through the flange. φ3.5㎜ flushing holes 32 are evenly arranged on the wall of the inner pipe in the sandwich, and a water supply pipe 31 is arranged on the outer pipe located outside the desludging tank 1.
[0018] The discharge pipes 4 are respectively arranged at the bottom of each channel except the mud washer 3, and gate valves 41 are arranged on the discharge pipes 4. The outlet ends of the discharge pipes 4 are all connected to the same discharge main pipe, which is externally connected to the concentrate pool.
[0019] The flushing water assembly includes a main pipe 51 and four branch pipes 52. The main pipe 51 is arranged on the left side and rear side of the desludging tank 1. The four branch pipes 52 are respectively arranged on the left side edge of the leftmost channel and at the top positions of the three channels. A number of water outlets are evenly arranged on the branch pipes 52.
[0020] A method for improving the grade of fine-grained magnetite concentrate, the specific steps are: S1: The upstream slurry conveying pipeline is connected to the outer end of the mud washer 3, the slurry is passed into the inner tube of the mud washer 3, and the water supply pipe 31 is fed with 0.5 MPa flushing water through a water pump. The flushing water enters the inner tube from the flushing hole 32 on the inner tube of the mud washer 3 to flush the slurry and then enters the leftmost channel of the desludging tank 1 together.
[0021] S2: The flushed slurry continues to flow into the desludging tank 1. The slurry has a low density and rises in the desludging tank 1. The upper slurry tailings enter the overflow tank 2 and are discharged from the mud discharge pipe 21. The iron concentrate drops due to its high density and is concentrated at the bottom of the desludging tank 1. The coarser iron concentrate first settles in the leftmost channel, and the particle size of the iron concentrate in each channel on the right decreases successively, forming a graded sedimentation. The settled iron concentrate enters the bottom discharge pipe 4 along the inclined bottom plate of the tank and is discharged into the concentrate pool, thereby realizing the separation of the iron concentrate and the sludge.
[0022] S3: During the continuous operation of the desludging tank 1, each branch pipe 52 of the flushing water assembly introduces flushing water into the desludging tank 1. The flushing water disperses the iron concentrate at the bottom of the desludging tank 1 from the left side of the desludging tank 1 and the top of the tank bottom plate to prevent the iron concentrate from settling and accumulating at the bottom.
[0023] S4: The ore inflow into the mud washer 3, the discharge amount of the mud discharge pipe 21 and the discharge amount of the ore discharge pipe 4 are adjusted by the gate valve 41 arranged on the ore discharge pipe 4 to ensure the working balance of the desludging tank 1 and the mud washing effect.
[0024] Through the above technical solution, taking the collection of process samples before and after the use of this technology as an example, the original ore slurry, overflow tailings slurry and the concentrate after washing were sampled and compared. The following is the comparison data:
[0025] Table 1. Raw ore, concentrate and tailings refer to: rough iron ore, fine iron ore and mixed tailings of iron ore.
[0026]
[0027] Table 2. Raw ore, concentrate and tailings refer to: rough iron ore, fine iron ore + desludging tank concentrate, and mixed tailings from iron ore processing + desludging tank.
[0028]
[0029] Table 3. Raw ore, concentrate and tailings refer to: iron ore concentrate, desludging tank concentrate and desludging tank tailings respectively.
[0030] Through comparison of test data, the concentrate grade increased by 3-4 percentage points.
[0031] According to the standard production of iron ore concentrate of about 35,000 tons per year by the first beneficiation plant, the concentrate grade is increased by 3 percentage points, and the iron ore concentrate grade is 52%-55%. For every 1 percentage point increase, the sales price of the iron ore concentrate increases by 40 yuan / ton. The comprehensive income of this project is: 3.5*3*40=4.2 million yuan.
[0032] Parts of the present invention not described in detail are prior art.
[0033] The embodiments selected herein for the purpose of disclosing the invention are currently considered appropriate, but it should be understood that the invention is intended to include all changes and improvements of the embodiments that fall within the scope of the present concept and invention.
Claims
1. A device for improving the grade of fine-grained magnetite concentrate, characterized by: Including desludging tank, overflow tank, mud washer, discharge pipe and flushing components; The desludging trough is a square trough, and the trough bottom plate is inclined downward from the back to the front. A number of partitions are evenly spaced between the front and rear side plates in the desludging trough. The partitions are right-angled trapezoidal plates. The sides where the upper and lower bottoms of the partition right-angled trapezoid are located are respectively connected to the rear side plate and the front side plate of the desludging trough. The horizontal straight edge of the upper end of the partition is lower than the upper end of the desludging trough, and the lower oblique edge of the partition is consistent with the inclination direction of the trough bottom plate. The height of the partition in the desludging trough is gradually reduced from left to right, so that the gap between the lower side of the partition from left to right and the trough bottom plate is gradually reduced until the rightmost partition contacts the trough bottom plate, and a number of graded sedimentation channels are formed in the desludging trough through the partitions; the front side plate and the right side plate of the desludging trough are lower in height than the rear side plate and the left side plate, forming an overflow side; the overflow trough is arranged along the overflow side, the bottom of the overflow trough is inclined, and a mud discharge pipe is arranged at the bottom; The mud washer is arranged on the front side plate of the desludging tank corresponding to the leftmost slot. The mud washer is a double-layer tube structure. Both ends of the outer tube are closed to form a sandwich with the inner tube. The outer end of the inner tube is connected to the ore feeding pipeline. Flushing holes are evenly arranged on the wall of the inner tube in the sandwich. A water supply pipe is arranged on the outer tube located outside the desludging tank. The discharge pipes are respectively arranged at the bottom of each channel except the mud washer, and gate valves are arranged on the discharge pipes. The outlets of the discharge pipes are connected to the same discharge pipe. The flushing water assembly includes a main pipe and several branch pipes. The main pipe is arranged on the left side and rear side of the desludging tank. The branch pipes are respectively arranged on the left side of the leftmost channel and at the top position of each channel. Several water outlets are evenly arranged on the branch pipes.
2. The device for improving the grade of fine-grained magnetite concentrate according to claim 1 is characterized in that: The inclination angle of the desludging tank bottom plate is 25-30°.
3. The device for improving the grade of fine-grained magnetite concentrate according to claim 1 is characterized in that: A rubber pad is laid on the bottom plate of the desludging tank.
4. The device for improving the grade of fine-grained magnetite concentrate according to claim 1, characterized in that: The diameter of the flushing hole on the inner tube of the mud washer is φ3.5-6㎜, and the water pressure of the water supply pipe is 0.2-0.6 Mpa.
5. A method for improving the grade of fine-grained magnetite concentrate using the device for improving the grade of fine-grained magnetite concentrate according to any one of claims 1 to 4, characterized in that: The specific steps are: S1: The upstream slurry delivery pipeline is connected to the outer end of the mud washer, the slurry is passed into the inner tube of the mud washer, and the flushing water is passed into the water supply pipe through a water pump. The flushing water enters the inner tube from the flushing holes on the inner tube of the mud washer to flush the slurry and then enters the leftmost channel of the desludging tank together; S2: The washed slurry continues to flow into the desludging tank. The slurry has a low density and rises in the desludging tank. The upper slurry tailings enter the overflow tank and are discharged from the mud discharge pipe. The iron concentrate falls due to its high density and is concentrated at the bottom of the desludging tank. The coarser iron concentrate first settles in the channel close to the mud washer. The particle size of the iron concentrate in the channels to the right decreases in sequence, forming a graded sedimentation. The settled iron concentrate enters the bottom discharge pipe along the inclined bottom plate of the tank and is discharged into the concentrate pool, realizing the separation of iron concentrate and sludge. S3: During the continuous operation of the desludging tank, each branch pipe of the flushing water assembly introduces flushing water into the desludging tank. The flushing water flushes the iron concentrate at the bottom of the desludging tank from the left side of the desludging tank and the top of the tank bottom plate to prevent the iron concentrate from settling and accumulating at the bottom; S4: The ore inflow into the mud washer, the discharge volume of the mud discharge pipe and the discharge volume of the ore discharge pipe are regulated by the gate valve installed on the ore discharge pipe to ensure the working balance of the desludging tank and the mud washing effect.