System for treating moisture return of dried titanium concentrate

Abstract

The utility model relates to a system for treating moisture return of dried titanium concentrate, and belongs to the technical field of titanium raw material drying. The system comprises a drying rotary drum (2), a cooling rotary drum (6) and a bag-type dust collector (12), a discharging port of the drying rotary drum (2) is connected with a feeding port of the cooling rotary drum (6), an air pipeline (16) is arranged at the discharging end of the cooling rotary drum (6), an inlet of the bag-type dust collector (12) is connected with the feeding port of the cooling rotary drum (6), and an outlet of the bag-type dust collector (12) is connected with the feeding port of the cooling rotary drum (6). According to the system, the cooling rotary drum (6) is used for replacing a scraper conveyor to convey titanium concentrate, meanwhile, an air pipeline (16) is additionally arranged at the discharging end of the cooling rotary drum (6), and a bag-type dust collector (12) is additionally arranged at the front end of the cooling rotary drum (6), so that the effects of cooling and diluting gas moisture of the mixing furnace are achieved. The problem that in the prior art, due to the fact that the temperature in a dry ore bin (9) is reduced, moisture in furnace gas entering the dry ore bin (9) along with titanium concentrate is condensed again, and the titanium concentrate close to the wall of the dry ore bin (9) is caked is solved.

Description

Technical Field

[0001] The utility model relates to a system for treating the rewetting of dried ilmenite concentrate, belonging to the technical field of ilmenite concentrate drying. Background Art

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

[0003] There are two methods for the drying and dehydration process of ilmenite concentrate: direct drying and indirect drying. Due to the fine particle size of ilmenite 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 ilmenite concentrate is large, the production environment is poor, and during the drying process, due to the high initial temperature, the flotation reagents are easily decomposed or volatilized to emit pungent odors, polluting the environment and seriously affecting people's lives; currently, the indirect drying method is used to dry ilmenite concentrate. The drying process: the wet ilmenite 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 enters the rotary drum through the main flue pipe and exchanges heat with the wet ilmenite concentrate. The moisture in the ilmenite concentrate evaporates to form steam and mixes with the air entering the rotary drum to form furnace gas. Most of the furnace gas leaves the rotary drum through the furnace gas hood, and a small part enters the dry ore bin together with the dehydrated ilmenite 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 pipeline, and is discharged after being dust-removed by the bag filter. To reduce dust escape, the ilmenite concentrate after drying and dehydration is sealed from the indirect drying equipment rotary drum through the scraper conveyor and bucket elevator until it reaches the dry material bin. Part of the furnace gas containing the volatile moisture of the ilmenite concentrate in the rotary drum enters the dry ore bin together with the dried and dehydrated ilmenite concentrate. Due to the decrease in temperature in the dry ore bin, the moisture in the furnace gas condenses again, resulting in the agglomeration of the dried ilmenite concentrate near the wall of the dry ore bin, and in severe cases, water droplets drip out. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is that in the prior art, due to the decrease in temperature in the dry ore bin, the moisture in the furnace gas entering the dry ore bin together with the ilmenite concentrate condenses again, resulting in the agglomeration of the ilmenite 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 the rewetting of dried ilmenite concentrate, including a drying rotary drum, and also including a cooling rotary drum and a bag filter. The discharge port of the drying rotary drum is connected to the feed port of the cooling rotary drum, and an air pipeline is provided at the discharge port end of the cooling rotary drum. The inlet of the bag filter is connected to the feed port end of the cooling rotary drum, and the lower outlet is connected to the feed port of the cooling rotary drum.

[0006] Among them, a drying feed pipe is arranged at the feed end of the drying rotary drum in the above system, and a drying discharge hood is arranged at the discharge end. The lower end of the drying discharge hood is connected with a cooling feed pipe, and the other end of the cooling feed pipe is connected with the feed port of the cooling rotary drum. The lower discharge port of the bag filter is communicated with the cooling feed pipe.

[0007] Furthermore, an ash conveyor is arranged on the discharge pipeline at the lower end of the bag filter in the above system.

[0008] Among them, a dust removal hood is arranged at the feed end of the cooling rotary drum in the above system, and the inlet of the bag filter is communicated with the dust removal hood.

[0009] Furthermore, the above system further includes a bucket elevator and a dry ore bin. A cooling discharge hood is arranged at the discharge end of the cooling rotary drum. The cooling discharge hood is connected with the feed port of the bucket elevator, and the outlet of the bucket elevator is connected with the upper inlet of the dry ore bin.

[0010] Furthermore, a thermocouple is arranged on the connecting pipeline between the cooling discharge hood and the feed port of the bucket elevator in the above system.

[0011] Among them, L-shaped structures of flight bars are arranged at intervals on the inner wall of the cooling rotary drum in the above system, and one end of each flight bar is connected with the inner wall of the cooling rotary drum.

[0012] Furthermore, the flight bars are arranged in a spiral shape on the inner wall of the cooling rotary drum in the above system.

[0013] Furthermore, the length of the flight bars in the above system is 180 to 220 mm.

[0014] Among them, a flow meter is arranged on the air pipeline in the above system, and the flow meter is electrically connected with the dust removal fan of the bag filter.

[0015] The beneficial effects of the present utility model are as follows: By using a rotary drum cooler to replace the scraper conveyor for cooling and conveying the dried ilmenite concentrate, and at the same time adding a compressed air pipeline at the discharge end of the rotary drum for conveying and cooling the ilmenite concentrate, and adding bag dust removal at the front end of the rotary drum, the problem that the furnace gas enters the dry ore bin and causes the dried ilmenite concentrate to become wet and caked is solved, and repeated drying is avoided, thereby improving the yield. The compressed cold air introduced into the air pipeline plays a role in cooling and diluting the moisture in the mixed furnace gas. On the one hand, the temperature of the dried ilmenite concentrate is reduced to below 50 °C, which is measured online by the thermocouple, so as to avoid the residual moisture of the dried ilmenite concentrate from evaporating and condensing again after entering the dry ore bin; on the other hand, the water vapor content in the mixed furnace gas is reduced to below 7%, so as to avoid the mixed furnace gas from condensing and sticking to the bag in the bag dust removal. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 For the present utility model Figure 1 is a schematic cross-sectional structure diagram at A-A in it.

[0018] The markings in the figure are: 1, drying feed pipe; 2, drying rotary drum; 3, drying discharge hood; 4, cooling feed pipe; 5, dust removal hood; 6, cooling rotary drum; 7, cooling discharge hood; 8, bucket elevator; 9, dry ore bin; 10, flight; 11, dust removal pipeline; 12, bag filter; 13, ash conveyor; 14, pipeline after dust removal; 15, dust removal fan; 16, air pipeline; 17, thermocouple. Specific embodiments

[0019] The present utility model will be further described below with reference to the accompanying drawings.

[0020] As Figure 1 and 2 shown, a system for treating the rewetting of dried ilmenite concentrate of the present utility model includes a drying rotary drum 2, and also includes a cooling rotary drum 6 and a bag filter 12. The discharge port of the drying rotary drum 2 is connected to the feed port of the cooling rotary drum 6, and an air pipeline 16 is provided at the discharge port end of the cooling rotary drum 6. The inlet of the bag filter 12 is connected to the feed port end of the cooling rotary drum 6, and the lower outlet is connected to the feed port of the cooling rotary drum 6. Those skilled in the art can understand that in this system, the cooling rotary drum 6 is used to replace the scraper conveyor to convey the ilmenite concentrate. At the same time, an air pipeline 16 is added at the discharge end of the cooling rotary drum 6, and a bag filter 12 is added at the front end of the cooling rotary drum 6 to play a role in cooling and diluting the moisture in the mixed furnace gas. Specifically, the discharge port of the drying rotary drum 2 is connected to the feed port of the cooling rotary drum 6, and an air pipeline 16 is provided at the discharge port end of the cooling rotary drum 6 to facilitate the introduction of compressed cold air. The inlet of the bag filter 12 is connected to the feed port end of the cooling rotary drum 6, and the lower outlet is connected to the feed port of the cooling rotary drum 6. The solid-gas separation is realized by collecting the mixed gas at the feed end of the cooling rotary drum 6 through the bag filter 12. The specific process is as follows: The water-containing ilmenite concentrate enters the drying rotary drum 2 through the drying feed pipe 1, is heated to 88-92 °C in the drying rotary drum 2 for dehydration and drying, and then is discharged together with part of the furnace gas into the cooling rotary drum 6; The cold air enters the cooling rotary drum 6 through the air pipeline 16 at the discharge end of the cooling rotary drum 6, countercurrently exchanges heat with the ilmenite concentrate in the cooling rotary drum 6. After heat exchange, the cold air is mixed with the furnace gas entering the cooling rotary drum 6 with the ilmenite concentrate, and enters the chimney and is discharged into the air after passing through the dust removal pipeline 11, bag dust removal 12, pipeline after dust removal 14, and dust removal fan 15 at the feed end of the cooling rotary drum 6; The ilmenite concentrate entering the bag filter 12 with the mixed furnace gas is collected by the dust removal bag and then returned to the cooling feed pipe 4 by the ash conveyor 13, and together with the ilmenite concentrate entering from the drying rotary drum 2, passes through the cooling discharge hood 7 and the bucket elevator 8 and enters the dry ore bin 9.

[0021] Preferably, a drying feed pipe 1 is provided at the feed end of the drying drum 2 in the above system, and a drying discharge hood 3 is provided at the discharge end. The lower end of the drying discharge hood 3 is connected to a cooling feed pipe 4, and the other end of the cooling feed pipe 4 is connected to the feed port of the cooling drum 6. The lower discharge port of the bag filter 12 is communicated with the cooling feed pipe 4. Those skilled in the art can understand that, for the convenience of feeding and collection, a drying feed pipe 1 is further provided at the feed end of the drying drum 2 in this system, a drying discharge hood 3 is provided at the discharge end, the lower end of the drying discharge hood 3 is connected to a cooling feed pipe 4, and the other end of the cooling feed pipe 4 is connected to the feed port of the cooling drum 6, so that the lower discharge port of the bag filter 12 is communicated with the cooling feed pipe 4.

[0022] Preferably, a dust conveyor 13 is provided on the discharge pipeline at the lower end of the bag filter 12 in the above system. Those skilled in the art can understand that, in order to achieve solid-gas separation, a dust conveyor 13 is provided on the discharge pipeline at the lower end of the bag filter 12 in this system, so that the solid treated by the bag filter 12 enters the cooling drum 6 through the dust conveyor 13.

[0023] Preferably, a dust removal hood 5 is provided at the feed end of the cooling drum 6 in the above system, and the inlet of the bag filter 12 is communicated with the dust removal hood 5. Those skilled in the art can understand that, in order to reduce dust and facilitate collection, a dust removal hood 5 is further provided at the feed end of the cooling drum 6 in this system, and the inlet of the bag filter 12 is kept communicated with the dust removal hood 5.

[0024] Preferably, the above system further includes a bucket elevator 8 and a dry ore bin 9. A cooling discharge hood 7 is provided at the discharge end of the cooling drum 6. The cooling discharge hood 7 is connected to the feed port of the bucket elevator 8, and the outlet of the bucket elevator 8 is connected to the upper inlet of the dry ore bin 9. Those skilled in the art can understand that a bucket elevator 8 and a dry ore bin 9 are also provided in this system. Specifically, the bucket elevator 8 is used as a conveying device to send the dried titanium concentrate to the dry ore bin 9 for storage, and the dry ore bin 9 is a storage device. At the same time, a cooling discharge hood 7 is specifically provided at the discharge end of the cooling drum 6, and the cooling discharge hood 7 is connected to the feed port of the bucket elevator 8.

[0025] Preferably, a thermocouple 17 is provided on the pipeline connecting the cooling discharge hood 7 and the feed port of the bucket elevator 8 in the above system. Those skilled in the art can understand that, in order to prevent the residual moisture of the dried titanium concentrate from evaporating and condensing again after entering the dry ore bin 9, this device preferably provides a thermocouple 17 on the pipeline connecting the cooling discharge hood 7 and the feed port of the bucket elevator 8, and the temperature of the titanium concentrate discharge can be observed in real time through the thermocouple 17.

[0026] Preferably, in the above system, the inner wall of the cooling rotary drum 6 is provided with L-shaped lifters 10 at intervals, and one end of the lifter 10 is connected to the inner wall of the cooling rotary drum 6. Those skilled in the art can understand that, in order to ensure that the ilmenite in the cooling rotary drum 6 is evenly lifted, the device preferably has L-shaped lifters 10 arranged at intervals on the inner wall of the cooling rotary drum 6, and one end of the lifter 10 is connected to the inner wall of the cooling rotary drum 6, so that the bent inner wall of the lifter 10 and the inner wall of the cooling rotary drum 6 form a trough-shaped structure. It is further preferable that the rotation speed of the cooling rotary drum 6 is the same as or slightly lower than that of the drying rotary drum 2, with a difference not exceeding 7%.

[0027] Preferably, in the above system, the lifters 10 are arranged spirally on the inner wall of the cooling rotary drum 6. Those skilled in the art can understand that, in order to further ensure that the ilmenite is evenly lifted and increase the heat exchange area, the device preferably has the lifters 10 arranged spirally on the inner wall of the cooling rotary drum 6.

[0028] Preferably, in the above system, the length of the lifter 10 is 180 to 220 mm. Those skilled in the art can understand that the system preferably selects the length of the lifter 10, which actually facilitates installation and reduces the manufacturing cost. Specifically, the length of the lifter 10 is preferably 180 to 220 mm, and actually, the length of the lifter 10 can preferably be 200 mm.

[0029] Preferably, in the above system, a flow meter is provided on the air pipeline 16, and the flow meter is electrically connected to the dust removal fan 15 of the bag filter 12. Those skilled in the art can understand that, in order to ensure the heat exchange effect of the ilmenite in the cooling rotary drum 6, a flow meter is actually preferably provided on the air pipeline 16, and the flow meter is electrically connected to the dust removal fan 15 of the bag filter 12. By adjusting the frequency of the dust removal fan 15 and the cold air flow rate in cooperation, the pressure in the cooling rotary drum 6 is controlled at -200 Pa to -230 Pa.

[0030] Example: In a 50 kg / h rotary kiln simulation test in the laboratory, the ilmenite with a water content of 8.61% before drying, a moisture content of 0.37% and a temperature of 91 °C after drying enters the cooling drum. The cold air pressure is 0.11 MPa, and the flow rate is 2.5 - 2.7 Nm 3 / h. The pressure in the cooling drum is -207 to -219 Pa. After cooling, the temperature of the ilmenite is 46 °C. After standing for 24 hours, the ilmenite particles are loose and there is no bonding phenomenon.

[0031] The inventor's 50 kg / h rotary kiln simulation test in the laboratory shows that using this method can effectively solve the problem of rewetting of ilmenite after drying, reduce the re-drying amount of returned ore by 3.26% - 4.30%. For an annual output of 460,000 tons of ilmenite and an energy consumption of 73 Nm per ton of ore 3Gas calculation, with an annual production capacity increase of 15,000 - 19,800 tons and a gas consumption reduction of 1,094,700 - 1,443,900 Nm 3 .

Claims

1. A system for dealing with the rewetting of titanium concentrate after drying, comprising a drying rotary drum (2), characterized in that: It also includes a cooling drum (6) and a bag filter (12). The discharge port of the drying drum (2) is connected to the feed port of the cooling drum (6), and an air pipe (16) is provided at the discharge port end of the cooling drum (6). The inlet of the bag filter (12) is connected to the feed port end of the cooling drum (6), and the lower outlet is connected to the feed port of the cooling drum (6).

2. A system for treating the rewetting of dried ilmenite concentrate according to claim 1, characterized in that: A drying feed pipe (1) is provided at the feed end of the drying drum (2), and a drying discharge hood (3) is provided at the discharge end. The lower end of the drying discharge hood (3) is connected to a cooling feed pipe (4), and the other end of the cooling feed pipe (4) is connected to the feed port of the cooling drum (6). The lower discharge port of the bag filter (12) is communicated with the cooling feed pipe (4).

3. A system for treating the rewetting of dried ilmenite concentrate according to claim 2, characterized in that: An ash conveyor (13) is provided on the lower discharge pipe of the bag filter (12).

4. A system for treating the rewetting of dried ilmenite concentrate according to claim 1, characterized in that: A dust removal hood (5) is provided at the feed end of the cooling drum (6), and the inlet of the bag filter (12) is communicated with the dust removal hood (5).

5. A system for treating the rewetting of dried ilmenite concentrate according to claim 4, characterized in that: It also includes a bucket elevator (8) and a dry ore bin (9). A cooling discharge hood (7) is provided at the discharge end of the cooling drum (6). The cooling discharge hood (7) is connected to the feed port of the bucket elevator (8), and the outlet of the bucket elevator (8) is connected to the upper inlet of the dry ore bin (9).

6. A system for treating the rewetting of dried ilmenite concentrate according to claim 5, characterized in that: A thermocouple (17) is provided on the connecting pipe between the cooling discharge hood (7) and the feed port of the bucket elevator (8).

7. A system for treating the rewetting of dried ilmenite concentrate according to claim 1, characterized in that: L-shaped baffles (10) are arranged at intervals on the inner wall of the cooling drum (6), and one end of each baffle (10) is connected to the inner wall of the cooling drum (6).

8. A system for treating the rewetting of dried ilmenite concentrate according to claim 7, characterized in that: The baffles (10) are arranged in a spiral shape on the inner wall of the cooling drum (6).

9. A system for treating the rewetting of dried ilmenite concentrate according to claim 8, characterized in that: The length of the baffles (10) is 180 to 220 mm.

10. A system for treating the rewetting of dried ilmenite concentrate according to claim 1, characterized in that: A flow meter is provided on the air pipe (16), and the flow meter is electrically connected to the dust removal fan (15) of the bag filter (12).

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