1 Overview The Taihe iron ore concentrating plant is currently lagging behind in the current status of iron ore concentrate filtration, and still uses the old GYW-12 cartridge filter. The high moisture content of the iron concentrate filter cake has caused transportation difficulties and serious loss of concentrate during transportation. Not only pollutes the environment along the road, but also increases the energy consumption of the sintering and other smelting processes. The cost increases. The low production rate increases operating costs. Therefore, it is urgently needed to carry out technological transformation. 2 ZPG~40 Disc Vacuum Filter Structural Features ZPG Type Disk The structure of the vacuum filter is mainly composed of the main components of the distribution head bearing, material guiding and unloading device, filter plate, spindle, stirring device, tank feeding, stirring device and stirring drive, spindle transmission, centralized automatic lubrication system, etc. The main components are described as follows. 21 See the structure of the filter plate. The filter bag is covered with a filter cloth bag. The filter fan and the filter cloth are fixed on the filtrate branch pipe of the main shaft through a pull rod, a nut and a channel steel pressure plate to form a round filter. The disc filter fan is made of high-strength engineering plastics, with a smooth surface and large filtrate capacity. The filter cloth made of monofilament and multifilament yarns is interwoven. Chen Dayuan, Male, Engineer, 615041 Chongqing
High porosity and smooth surface preparation 1-distribution head; 2-bearing; 3-conductor and unloading device; 4-Plate;5-spindle; 6 stirring device; 7-slot body; 8-feeder 9-Stirring drive; 10-spindle drive; 11-central automatic lubrication system ZPG type disc vacuum filter structure. 2 Spindle and gas distribution device The main shaft and gas distribution device are the main working parts of the filter. Its structure is mainly composed of a central shaft, a filtrate tube, a filter fan socket, a friction disk, etc. The central shaft is made of a thick-walled steel pipe, and it is subjected to torque. And the 20 bending moments of the filtrate tube are evenly distributed on the circumference of the central axis. The head of the filter fan is inserted into the filter fan socket on the filtrate tube. The filtrate is discharged from the gas distribution device through the filtrate tube under the suction of the vacuum pump. Outside the machine.
The gas distribution device is a key component for controlling the operation process of the filter. The left and right distribution heads form a filtrate outlet at the lower part of the distribution head, and is connected with a vacuum line. A vacuum gauge is installed at the top to observe the degree of vacuum. During the operation of the main shaft, the gas distribution device ensures that the groups of filter fans arranged along the filtrate pipe pass through the adsorption zone, the unloading zone of the drying zone and the cleaning zone in turn, and the filtering operation is completed 1 - filter bag; 2-filter fan; 3- Pull rod; 4-nut; 5-press plate; 6- filter filter plate with gas plate and friction plate are made of special cast iron with excellent wear resistance, long service life, sealing the pregnancy tube with composite wear-resistant ceramic pipe, with High service life, after damage can be removed separately. Replacement or repair 23 Stirring device To prevent sedimentation of the slurry, a paddle-type stirring device is arranged in the lower part of the tank, the stirring shaft is parallel to the main shaft, and the stirring shaft is equipped with a blade. The mixing of the slurry stirring shaft driven by the filter plate is composed of a speed-regulating motor, a cycloid reducer, and a chain drive. The structure of the mixer is shown in the table. The stirring is stepless speed-stirred and can be selected for different materials. The stirring ring is equipped with a water ring seal at both ends of the stirring shaft. The continuous injection pressure is Q2~0.3MPa/kg during operation; s is the solid weight concentration in the slurry; m is the wet-dry mass ratio of the filter cake; Filtered The amount of treatment, kg; n is the speed of the filter; d is the water density of water, to ensure that the sealing 4 filter cloth cleaning device is mainly composed of the inlet manifold, the branch and the nozzle, etc. When the pipeline is filled with pressure water, the flow High-speed spraying of filter cloth along the pipeline through nozzles achieves the purpose of cleaning.
The cleaning cycle depends on the nature of the material. Under normal circumstances, the filter cloth is cleaned once every 200 hours of work, 60 minutes each time, and the required water pressure is 0.3-0.4 MPa. The slurry in the tank should be drained during cleaning.
Reducer and speed control motor; 2-chain; 3 4-sprocket; 5-pedestal;6-combination seal; 7-axis head; 8-stirring shaft; 9-wide blade; 10-narrow blade; 12-Adhesive sleeve; 13-positioning ring; 14-bearing; 15-oil cup;16-bearing seat; 17-gland; 18-packing; 19-pack base; 20-press plate; 21-ring; 22-Flexible flange; 23-O-ring; 24-clamp; 25-water ring; 26-shaft sleeve; 27-Clamping lubricating device consists of multi-point dry oil pump, oil pipe, grease nipple etc. The device can be used on this machine. Most lubrication points are forced to be lubricated at regular intervals. The time and interval of lubrication are set and controlled by the time relay, thus realizing automatic centralized lubrication and ensuring normal operation of each working part.
2.6 The tank body is the support for the machine and the container for the pulp. It is welded by steel plates. The slurry tank is provided with a slurry overflow port which guarantees a certain liquid level height, and the slurry discharge port and filter cake discharge port are increased. Filtering coefficient and technical characteristics of reducing filter cake moisture Single-cycle processing capacity of disc filter: Therefore, the single-cycle treatment capacity of disc vacuum filter is directly proportional to the effective filtering area of ​​the equipment; and the pressure difference between the filtration and the cake filtration area The square root of the operating parameters, such as the angle of rotation and speed, is proportional to the square root of the operating parameters and is proportional to the ore concentration. Therefore, to increase the single-cycle throughput of the disc filter, the structure of the filter fan must be optimized to increase the effective filter area of ​​the filter fan. To ensure the sealing performance of the whole machine, make the filter work under a higher vacuum; increase the overflow liquid level as much as possible, and take the water of the filter cake of the disc vacuum filter at the angle of the large cake filtration area. At the stage of vacuum suction and dehydration of filter cake, the dehydration mechanism is air replacement and dehydration, which reduces the saturation of the filter cake. The relationship between the moisture content of the filter cake and the final saturation and porosity of the filter cake is: the saturation of the filter cake is : Area angle; S is the saturation of the filter cake; P*p>,. It is the penetration vacuum of the air through the filter cake.
It can be seen that the higher the vacuum degree of the disc vacuum filter, the smaller the aa, the smaller the S, and the lower the moisture content of the filter cake.
1 Improve the filtration coefficient The improvement of the sealing performance of the whole machine ensures the vacuum degree of work. The vacuum degree of the ZPG-72 disc vacuum filter is 006 MPa or more in the concentrate filtration, while the vacuum of the original rotary vacuum filter is conventional. The level of overflow is only about 004MPa, which ensures a longer filtration time and makes the filter fan on the disc completely immersed in the slurry, ensuring the degree of vacuum and ensuring the clarification of the overflow. The deeper slurry tank actually performs a certain concentration effect, which greatly improves the yield. (4) The new single multifilament interwoven filter cloth has low resistance and strength, and the thickness of the filter cloth is also higher than that of the drum vacuum filter. The filter cloth is thin, and the filtrate can be discharged through the filter cloth faster. The polypropylene monofilament material used is a hydrophobic material, and the surface is smooth, so that the adhesion between the filter cake and the filter cloth is reduced, and the unloading rate is high.
The combination of reverse blow and scraper unloading ensures that the unloading rate is over 90%, which overcomes the vicious circle that the traditional disc filter unloading rate is only 40%~60%.
The filter cloth cleaning device can ensure the regeneration of the filter cloth, so that the filter cloth can work under lower resistance. 3.2 The improvement of the sealing performance of the filter cake moisture machine ensures the vacuum degree of the work.
The long dewatering zone ensures a long time for replacement and dehydration. The filtrate flow path of the new filter fan is unimpeded, which greatly improves the effective filtration area. Under the effect of vacuum suction force, the filtrate replaced by gas can be discharged quickly. The automatic strong stirring device ensures uniform slurry concentration distribution in the tank, ensures uniform filter cake on the filter plate, and does not cause cracking of the filter cake in the dehydration stage, which not only reduces the loss of the vacuum degree, but also ensures the filter cake Replacement of dehydrated 4ZP40 disc vacuum filter applications Taihe Iron Ore purchased a ZPG-40 disc vacuum filter and conducted tests before use. The tests were carried out entirely in the production process. The main parameters of the equipment such as vacuum, spindle speed, stirring speed were tested to determine the best operating parameters of the equipment. A comparative test of the equipment and a test of the economical branching 1 vacuum degree were carried out on different degrees of vacuum under the condition that the spindle speed was fixed at a 0.75r/min stirring speed of 80r/min and the ore concentration was about 4. The test and test results are shown in Table 1. From the analysis in Table 1, it can be concluded that a higher vacuum degree can give a good filtration index. When the vacuum degree reaches 0.06MPa or more, the filter cake falls onto the conveyor belt and becomes a dry powder. The water content of the filter cake can be reduced to 9.20% or less, and the processing capacity at the table can reach more than 40 tons, showing the powerful superiority of the equipment. Table 1 Test results Test conditions Test results Feed concentration Spindle speed Rotating speed Vacuum degree Filter cake moisture treatment Quantitative tank overflow concentration Table 2 Test results Test conditions Test results Feed concentration Concentration Vacuum degree Stirring speed/MPa Cake moisture table throughput/th-tank overflow concentration 4.2 Spindle speed test Stir at 0l055MPa at vacuum degree Under the condition that the speed of 80r/min to feed ore is 40%, different spindle speeds are tested. The test results are shown in Table 2 from Table 2 and the field observation and analysis. When the spindle speed is 0l75r/min, the filter on the filter Thickness of about 20mm, and more uniform, the blower is preferably configured to match the field, cake discharge rate. When the rotating speed is 1r/min, because the rotating speed is too fast, the fluctuation of the vacuum degree is caused, which affects the thicker filter cake formed when the processing speed at the station is slow, and the filter cake water is slightly larger. Conclusion: The optimum range of spindle speed is 0.65~ 0.75r/min, which can ensure higher time-to-hour throughput and lower filter cake. Table 3 Test Results Test Conditions Test Results Feed Concentration Spindle Speed ​​Vacuum Degree Filter Cake Moisture treatment capacity / tDh-1 tank overflow concentration 4.3 stirring speed test 75r/min In the same vacuum configuration, the ore concentration of 40%, the different stirring speed was tested, the test results Table 3 from the analysis of Table 3 can be concluded: When the stirring speed is low, the filter cake on the uneven distribution of the thickness of the filter; and the stirring speed is too fast, it also caused the filter fan on some places not on the cake, are caused The fluctuation of the vacuum degree makes the water content of the filter cake high, the processing amount at the time of the table is too low, the stirring speed is too fast, and the flooding concentration is also large. Therefore, the best stirring speed is about 80r/min.
4.4 Comparison test and benefit analysis (see Table 4) Table 4 Comparison of test results and economical analysis of equipment Vacuum filtration filter cake host filter cloth filter area moisture, power vacuum pump cycle model original barrel disc from the test results , ZPG-72 disc vacuum filter concentrate filter cake moisture than the original GYW-12 cartridge filter moisture decreased by more than 1.5 percentage points, the filtration factor per unit area increased by more than 30%, and the investment per unit area and energy consumption Both are significantly reduced According to Table 4, the annual output of 1.2 million iron ore concentrates is calculated. The operation cost analysis is shown in Table 5. Table 5 Operation cost analysis Vacuum filter energy consumption Filter cloth consumption Cost savings RMB 10,000. A-1 total power / kW / throughput / h-1 filter element. Set - 1 use time / d processing iron ore / t energy consumption filter cloth 5 Conclusion air filter for Taihe iron ore concentrate the best filter parameters: the spindle speed of 0. 65 ~ 0.75r / min, The stirring speed is set at about 80r/min, and the vacuum degree is under the optimal operating parameters. The moisture content of the filter cake of the ZPG-40 disc vacuum filter is less than 9.5, and the water content of the filter cake is 1.50 lower than that of the original GYW-12 cartridge filter. Above the percentage point, the processing capacity at the station is 40 tons, and the filtration coefficient is 1 12. The increase of the barrel filter by more than 30% In the case of only analyzing the energy consumption and the cost of the filter cloth, the ZPG-40 disc vacuum filter can be directly The benefit is more than 914,500 yuan. If we consider reducing the water content of the cake, the indirect benefits brought by the follow-up process, the benefits of the disc vacuum filter will be more significant.
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