System for treating dried titanium concentrate caking

Abstract

The utility model relates to a system for treating dried ilmenite concentrate caking, and belongs to the field of titanium raw material drying equipment. The system comprises a drying rotary drum (4), a discharging port of the drying rotary drum (4) is connected with a discharging pipe (8), a plurality of baffles (9) are arranged in the discharging pipe (8) at intervals, the baffles (9) are arranged in a staggered mode, and one ends of the baffles (9) are connected with the inner wall of the discharging pipe (8). According to the system, the baffles (9) are welded in the discharging pipe (8) in a staggered mode, the resistance of furnace gas entering the dry ore bin (13) is increased through the baffles (9), the amount of furnace gas entering the dry ore bin (13) is reduced, and therefore water condensation of the furnace gas is reduced. The problem that in the prior art, part of furnace gas containing titanium concentrate volatile moisture enters a dry ore bin (13) along with titanium concentrate, due to the fact that the temperature in the dry ore bin (13) is reduced, moisture in the furnace gas is condensed again, and the dried titanium concentrate close to the wall of the dry ore bin (13) is caked is solved.

Description

Technical Field

[0001] The utility model relates to a system for treating agglomerated titanium concentrate after drying, belonging to the field of titanium raw material drying equipment. Background Technique

[0002] The production of titanium concentrate uses the tailings after iron separation of iron-containing composite iron ore as raw materials, and is enriched after beneficiation. Before the subsequent treatment of titanium concentrate, it must first go through a high-temperature process. However, the flotation titanium concentrate generally contains 8-12% moisture. If the water-containing titanium concentrate is directly used in the high-temperature process, it will inevitably affect its redox roasting effect and energy consumption. Therefore, it is very necessary to dry and dehydrate the water-containing titanium concentrate before feeding it into the furnace.

[0003] There are two methods for the drying and dehydration process of titanium concentrate: direct drying and indirect drying. Due to the fine particle size of titanium concentrate, wide particle size distribution range, particles below 200 mesh (0.074mm) accounting for more than 75%; large moisture content of the material, easy to agglomerate; poor fluidity and other characteristics; the loss of direct drying of titanium concentrate is large, the production environment is poor, and during the drying process, due to the high initial temperature, the flotation agent is easy to decompose or volatilize and emit irritating odors, causing environmental pollution and seriously affecting people's lives; currently, the indirect drying method is used to dry titanium concentrate. The drying process: the water-containing titanium concentrate enters the rotary drum through the feed pipe, and the high-temperature flue gas generated by the combustion of gas and air in the hot blast stove passes through the main flue gas pipe and exchanges heat with the water-containing titanium concentrate in the rotary drum. The water in the titanium concentrate evaporates to form steam and mixes with the air entering the rotary drum to form furnace gas with a water vapor content of 24.7-27.3%. Most of it leaves the rotary drum through the furnace gas hood, and a small part enters the dry ore bin together with the dehydrated titanium concentrate through the discharge hood, discharge pipe, scraper conveyor, and bucket elevator. The flue gas after heat exchange passes through the return pipe, flue gas hood, flue gas pipe, and is discharged after being dust-removed by a bag filter. To reduce dust escape, the dehydrated titanium concentrate from the indirect drying equipment rotary drum to the dry material bin through the scraper conveyor and bucket elevator is all in a sealed manner. A part of the furnace gas containing the volatile water of the titanium concentrate in the rotary drum enters the dry ore bin together with the dried and dehydrated titanium concentrate. Due to the temperature reduction in the dry ore bin, the water in the furnace gas condenses again, resulting in the agglomeration of the dried titanium concentrate near the wall of the dry ore bin, and in severe cases, water drops out. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is that in the prior art, a part of the furnace gas containing the volatile water of the titanium concentrate enters the dry ore bin together with the titanium concentrate. Due to the temperature reduction in the dry ore bin, the water in the furnace gas condenses again, resulting in the agglomeration of the dried titanium concentrate near the wall of the dry ore bin.

[0005] The technical solution adopted by the utility model to solve its technical problem is: a system for treating agglomerated titanium concentrate after drying, including a drying rotary drum, the discharge port of the drying rotary drum is connected with a discharge pipe, and a plurality of baffles are arranged at intervals in the discharge pipe, the baffles are arranged staggeredly, and one end is connected to the inner wall of the discharge pipe.

[0006] Among them, the baffle plate in the above system is arranged to incline downward, and the included angle between the inclination direction and the axial direction of the discharge pipe is 30° to 35°.

[0007] Furthermore, the horizontal length of the baffle plate in the above system is 3 / 5 to 2 / 3 of the width of the discharge pipe.

[0008] Among them, the above system further includes a dust removal pipeline and a bag filter. The outlet of the discharge pipe is connected with a scraper conveyor. One end of the dust removal pipeline is connected with the scraper conveyor, and the other end is connected with the inlet of the bag filter.

[0009] Furthermore, the discharge end of the scraper conveyor in the above system is connected with a bucket elevator, and the discharge port of the bucket elevator is connected with a dry ore bin through a conveying pipeline.

[0010] Furthermore, an electric valve is arranged on the dust removal pipeline in the above system, a moisture detector is arranged on the conveying pipeline, and the moisture detector is electrically connected with the electric valve.

[0011] Among them, the discharge port of the bag filter in the above system is connected with the dry ore bin.

[0012] Among them, a feed pipe and a main flue gas pipe are arranged at the feed end of the drying rotary drum in the above system. An outlet hood is arranged at the discharge end of the drying rotary drum, and the outlet hood is connected with the inlet of the discharge pipe.

[0013] Furthermore, a furnace gas hood is arranged at the feed end of the drying rotary drum in the above system.

[0014] Furthermore, a flue gas hood is arranged at the drying rotary drum near the feed pipe. The outlet hood is connected with the flue gas hood through a return air pipe, and the flue gas hood is connected with the inlet of the bag filter through a flue gas pipeline.

[0015] The beneficial effects of the present utility model are as follows: The structure of this system is simple and convenient to manufacture. The internal structure of the discharge pipe is actually improved. By welding staggered baffle plates inside the discharge pipe, the resistance of furnace gas entering the dry ore bin is increased through the staggered baffle plates, the amount of furnace gas entering the dry ore bin is reduced, and thus the condensation of furnace gas moisture is reduced. And the inventor's 50 kg / h rotary kiln simulation experiment and on-site test in the laboratory show that adopting this system can reduce the amount of returned ore for drying by 2.96% - 4.22% of the total output. Calculated by taking an annual output of 460,000 tons of titanium concentrate and blast furnace gas consumption of 73 Nm Figure 1 , , 3 , ,

[0016] , 3 , blast furnace gas, the annual production capacity is increased by 13,600 - 19,400 tons, and the blast furnace gas consumption is reduced by 991,800 - 1,416,900 Nm 3 . BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present utility model.

[0017] In the figure, the markings are as follows: 1, feed pipe; 2, furnace gas hood; 3, flue gas hood; 4, drying rotary drum; 5, main flue gas pipe; 6, return pipe; 7, discharge hood; 8, discharge pipe; 9, baffle; 10, scraper conveyor; 11, bucket elevator; 12, moisture detector; 13, dry ore bin; 14, flue gas pipe; 15, dust removal pipe; 16, electric valve; 17, bag filter. Detailed implementation mode

[0018] The present utility model will be further described below with reference to the accompanying drawings.

[0019] As Figure 1 shown, a system for treating agglomerated titanium concentrate after drying according to the present utility model includes a drying rotary drum 4. The discharge port of the drying rotary drum 4 is connected to a discharge pipe 8, and a plurality of baffles 9 are arranged at intervals in the discharge pipe 8. The baffles 9 are arranged staggeredly, and one end is connected to the inner wall of the discharge pipe 8. Those skilled in the art can understand that in order to reduce the amount of gas entering the subsequent dry ore bin 13, the internal structure of the discharge pipe 8 of this system is actually improved. By welding staggered baffles 9 inside the discharge pipe 8, the resistance of furnace gas entering the dry ore bin 13 is increased through the staggered baffles 9, and the amount of furnace gas entering the dry ore bin 13 is reduced, thereby reducing the condensation of furnace gas moisture.

[0020] Preferably, in the above system, the baffle 9 is arranged to incline downward, and the included angle between the inclination direction and the axial direction of the discharge pipe 8 is 30° to 35°. Those skilled in the art can understand that in order to ensure that the titanium concentrate after drying can smoothly enter the scraper conveyor 10, the inclination angle of the baffle 9 is further limited in this system. Specifically, the baffle 9 is arranged to incline downward, and the included angle between the inclination direction and the axial direction of the discharge pipe 8 is 30° to 35°. Therefore, the axial direction of the discharge pipe 8 here should be the direction below the discharge pipe 8, that is, the direction towards the scraper conveyor 10 side.

[0021] Preferably, in the above system, the horizontal length of the baffle 9 is 3 / 5 to 2 / 3 of the width of the discharge pipe 8. Those skilled in the art can understand that the horizontal length of the baffle 9 in this system is further optimized, that is, the projection length of the inclined baffle 9 in the horizontal direction. The width of the discharge pipe 8 can actually be understood as the diameter if the discharge pipe 8 is a circular pipe or the length if it is a square pipe. Therefore, the horizontal length of the baffle 9 is further limited to be 3 / 5 to 2 / 3 of the width of the discharge pipe 8.

[0022] Preferably, the above system further includes a dust removal pipeline 15 and a bag filter 17. The outlet of the discharge pipe 8 is connected to a scraper conveyor 10. One end of the dust removal pipeline 15 is connected to the scraper conveyor 10, and the other end is connected to the inlet of the bag filter 17. Those skilled in the art can understand that by adding a dust removal pipeline 15 between the scraper conveyor 10 and the bag filter 17, the furnace gas entering the scraper conveyor 10 is introduced into the dust removal pipeline 15 before entering the bag filter 17. In fact, the dust removal pipeline 15 can be connected to the subsequent flue gas pipeline 14 to dilute the moisture in the furnace gas and prevent the dust removal bags from scaling. The furnace gas in the scraper conveyor 10 is purified by the bag filter 17 and then discharged with the flue gas.

[0023] Preferably, a bucket elevator 11 is connected to the discharge end of the scraper conveyor 10 in the above system, and the discharge port of the bucket elevator 11 is connected to a dry ore bin 13 through a conveying pipeline. Those skilled in the art can understand that for the convenience of titanium concentrate transportation, the system preferably connects a bucket elevator 11 to the discharge end of the scraper conveyor 10, and the discharge port of the bucket elevator 11 is connected to a dry ore bin 13 through a conveying pipeline.

[0024] Preferably, an electric valve 16 is provided on the dust removal pipeline 15 in the above system, and a moisture detector 12 is provided on the conveying pipeline, and the moisture detector 12 is electrically connected to the electric valve 16. Those skilled in the art can understand that a valve 16 is installed on the dust removal pipeline 15, and an on-line moisture detector 12 is installed on the dry ore conveying pipeline between the bucket elevator 11 and the dry ore bin 13 to detect the moisture content in the furnace gas entering the dry ore bin 13 in real time. By adjusting the opening of the valve 16, the moisture content of the furnace gas entering the dry ore bin 13 is adjusted, and the moisture content of the furnace gas entering the dry ore bin 13 is controlled to be below 3% by the moisture detector 12.

[0025] Preferably, the discharge port of the bag filter 17 in the above system is connected to the dry ore bin 13. Those skilled in the art can understand that the furnace gas mixed with the dried titanium concentrate is collected by the bag dust removal and then bagged, stacked and sold together with the dried titanium concentrate. In fact, it can be connected to the dry ore bin 13 and collected and processed together. A rotary valve can be preferably provided at the discharge port of the bag filter 17 to achieve solid-gas separation.

[0026] Preferably, a feed pipe 1 and a main flue gas pipe 5 are provided at the feed end of the drying rotary drum 4 in the above system, and a discharge hood to the discharge port of the drying rotary drum 4, and the discharge hood 7 is connected to the inlet of the discharge pipe 8. Those skilled in the art can understand that for the convenience of system feeding and air intake, the system further provides a feed pipe 1 and a main flue gas pipe 5 at the feed end of the drying rotary drum 4. In fact, the titanium concentrate is input through the feed pipe 1, and the main flue gas pipe 5 is convenient for introducing furnace gas to exchange heat and dry the titanium concentrate. Further, a discharge hood 7 is provided at the discharge end of the drying rotary drum 4, and the discharge hood 7 is connected to the inlet of the discharge pipe 8. The discharge hood 7 facilitates the connection of the drying rotary drum 4 to the return air pipe 6 and the discharge pipe 8.

[0027] Preferably, a furnace gas hood 2 is provided at the feeding end of the drying rotary drum 4 in the above system. Those skilled in the art can understand that in order to ensure the uniform distribution of the flue gas in the main flue gas pipe 5 and realize uniform heat exchange with the ilmenite concentrate, it is preferred that a furnace gas hood 2 is provided at the feeding end of the drying rotary drum 4 in this device.

[0028] Preferably, a flue gas hood 3 is provided at the drying rotary drum 4 near the feeding pipe 1 in the above system. The discharge hood 7 is connected to the flue gas hood 3 through a return air pipe 6, and the flue gas hood 3 is connected to the inlet of the bag filter 17 through a flue gas pipe 14. Those skilled in the art can understand that in order to facilitate the collection of the flue gas after heat exchange, it is preferred that a flue gas hood 3 is provided at the drying rotary drum 4 near the feeding pipe 1 in this system, the discharge hood 7 is connected to the flue gas hood 3 through a return air pipe 6, and the flue gas hood 3 is connected to the inlet of the bag filter 17 through a flue gas pipe 14. So that the pressure of the flue gas pipe 14 after heat exchange is controlled at -650 Pa to -550 Pa, the temperature of the flue gas after heat exchange is 90 - 95 °C, and the frequency of the dust removal fan is 46 - 48 Hz. At the same time, when the drying is stopped for regular maintenance or due to an accident, the valve opening of the flue gas pipe 14 after heat exchange is reduced, the electric valve 16 arranged in the dust removal pipe 15 is fully opened, and the bag dust removal is delayed for 4 - 5 h to stop, so as to avoid the residual moisture in the ilmenite concentrate after drying from evaporating again in the dry ore bin 13 and condensing on the inner wall surface of the dry ore bin 13. Actually, one end of the dust removal pipe 15 can be connected to the scraper conveyor 10, the other end is connected to the middle of the flue gas pipe 14, and the end of the flue gas pipe 14 is connected to the inlet of the bag filter 17.

[0029] Example 1: A 50 kg / h rotary kiln simulation comparison test was carried out in the laboratory. The moisture content of the experimental ilmenite concentrate before drying was 7.33%. 237 kg of ilmenite concentrate was dried in 6 h. After drying, the ilmenite concentrate entered a container with a pipe installed at the lower part on the side. The temperature of the ilmenite concentrate was 89.5 °C and the moisture content was 0.31%. The furnace gas entering the container with the ilmenite concentrate was extracted from the pipe at the lower part on the side. After the test, the ilmenite concentrate in contact with the container wall agglomerated. After standing still for 24 h, the moisture content of 7 - 10 kg of ilmenite concentrate in contact with the container wall was 8.79% - 11.37%. 249 kg of ilmenite concentrate was dried in 6 h. The furnace gas was extracted from the discharge end of the rotary kiln tail. After drying, the temperature of the ilmenite concentrate was 91.1 °C and the moisture content was 0.45%. After drying, the ilmenite concentrate was left standing in the container for 24 h. During the standing period, air was extracted from the pipe at the lower part on the side until the temperature of the ilmenite concentrate in the container dropped to 45 °C and then stopped. The ilmenite concentrate particles that did not come into contact with the inside of the container were loose and the moisture content was 0.41%.

[0030] Example 2: Conducted tests on the 20# titanium concentrate drying line with an annual output of 230,000 tons. The moisture content of the furnace gas entering the dry ore bin 13 was measured using an off-line moisture analyzer. The pressure in the flue gas pipeline 14 after heat exchange was between -610 Pa and -570 Pa, the temperature of the flue gas after heat exchange was 92 - 95 °C, the frequency of the dust removal fan was 48 Hz, the opening of valve 16 was 33%, the moisture content of the furnace gas entering the dry ore bin 13 was 2.69 - 2.85%. After producing 610 t of titanium concentrate, the feeding to the dry ore bin 13 was stopped. The dry basis titanium concentrate was put into ton bags from the bypass small ore bin. After standing for 72 h, the titanium concentrate in the dry ore bin 13 was put into ton bags. No water dripping was found during the standing process, and the titanium concentrate flowed smoothly during the ton bag packaging process without blockage or caking of the titanium concentrate.

Claims

1. A system for treating agglomerated titanium concentrate after drying, comprising a drying rotary drum (4), characterized in that: The outlet of the drying drum (4) is connected to a discharge pipe (8), and a number of baffles (9) are arranged at intervals in the discharge pipe (8). The baffles (9) are arranged staggeredly, and one end is connected to the inner wall of the discharge pipe (8).

2. The system for treating the agglomeration of dried ilmenite concentrate according to claim 1, wherein: The baffle (9) is arranged to incline downward, and the included angle between the inclination direction and the axial direction of the discharge pipe (8) is 30° to 35°.

3. A system for treating the caking of dried ilmenite concentrate according to claim 2, characterized in that: The horizontal length of the baffle (9) is 3 / 5 to 2 / 3 of the width of the discharge pipe (8).

4. A system for treating caking of dried ilmenite concentrate according to claim 1, characterized in that: It further includes a dust removal pipeline (15) and a bag filter (17). The outlet of the discharge pipe (8) is connected to a scraper conveyor (10). One end of the dust removal pipeline (15) is connected to the scraper conveyor (10), and the other end is connected to the inlet of the bag filter (17).

5. A system for treating the agglomeration of dried ilmenite concentrate according to claim 4, characterized in that: The discharge end of the scraper conveyor (10) is connected to a bucket elevator (11), and the outlet of the bucket elevator (11) is connected to a dry ore bin (13) through a conveying pipeline.

6. The system for treating the agglomeration of dried ilmenite concentrate according to claim 5, wherein: An electric valve (16) is arranged on the dust removal pipeline (15), a moisture detector (12) is arranged on the conveying pipeline, and the moisture detector (12) is electrically connected to the electric valve (16).

7. A system for treating agglomerated titanium concentrate after drying, according to claim 5, characterized in that: The outlet of the bag filter (17) is connected to the dry ore bin (13).

8. A system for treating caking of titanium concentrate after drying according to claim 1, characterized in that: The feeding end of the drying drum (4) is provided with a feeding pipe (1) and a main flue gas pipe (5). The discharging end of the drying drum (4) is provided with a discharging hood (7), and the discharging hood (7) is connected to the inlet of the discharge pipe (8).

9. A system for treating agglomerated titanium concentrate after drying according to claim 8, characterized in that: The feeding end of the drying drum (4) is provided with a furnace gas hood (2).

10. A system for treating the caking of titanium concentrate after drying according to claim 8, characterized in that: A flue gas hood (3) is arranged at the drying drum (4) near the feeding pipe (1). The discharging hood (7) is connected to the flue gas hood (3) through a return air pipe (6), and the flue gas hood (3) is connected to the inlet of the bag filter (17) through a flue gas pipeline (14).

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