Drying and dust collecting system suitable for ultrafine fraction titanium concentrate
By combining a single-stage cyclone dust collector and an electrostatic-bag filter dust collector, the problem of insufficient collection capacity and enrichment of ultrafine titanium concentrate in the drying and dust collection system was solved, achieving efficient and economical titanium concentrate drying and dust removal, and reducing equipment wear and energy consumption.
Patent Information
- Application Number
- CN202511879064.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-02-03
AI Technical Summary
Existing drying and dust collection systems suffer from problems such as insufficient collection capacity, negative impact of enrichment behavior on the system, high equipment wear and high energy consumption when processing ultrafine titanium concentrate.
A two-stage dust removal system combining a single-stage cyclone dust collector and an electrostatic-bag filter is adopted. The exhaust gas temperature is adjusted by heat exchange ducts, and the wet electrostatic precipitator is eliminated. The dust removal fan is arranged between the electrostatic-bag filter and the desulfurization spray tower.
It improves the collection efficiency of ultrafine titanium concentrate, avoids enrichment behavior, reduces equipment wear and energy consumption, lowers investment costs, extends equipment life, and improves system stability.
Smart Images
Figure CN121452801A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of titanium concentrate drying, and particularly relates to a drying and dust collecting system suitable for superfine particle grade titanium concentrate. BACKGROUND
[0002] At present, in order to increase the yield of titanium concentrate in the beneficiation process, a large amount of fine particle grade and superfine particle grade titanium concentrate powder exists in the titanium concentrate product. The titanium concentrate powder after the beneficiation process does not have the condition of being directly sold as a product, and needs to be reduced to below 0.5% in water content to be used as a finished product.
[0003] The current forms of drying titanium concentrate powder mainly include indirect drying and direct drying. The indirect drying process has low heat exchange efficiency, which greatly increases the energy consumption of the drying system. Generally, the direct drying process is adopted to dry the titanium concentrate powder, but the fine particle grade and superfine particle grade titanium concentrate powder in the titanium concentrate powder will enter the dust collecting system with the drying waste gas. The titanium concentrate powder has high hardness and causes great wear of the bag dust collector. Generally, the titanium concentrate powder dust is recovered through a multi-stage cyclone dust collecting process combined with a wet dust collecting method. The cyclone dust collecting process has weak capturing ability for fine particle grade and superfine particle grade dust, and is mainly responsible for removing large particle dust in the waste gas. The fine particle grade and superfine particle grade titanium concentrate is captured in large amounts in the wet dust collecting stage, enters the dust collecting waste water and sludge, and cannot be directly formed into a product, and needs to be returned to the drying system again for drying. The fine particle grade and superfine particle grade titanium concentrate is easy to form enrichment in the system, and has a negative effect on the efficiency of the titanium concentrate drying system.
[0004] A typical existing drying and dust collecting process flow is as follows: 1. The fuel enters the fluidized bed furnace, and starts to burn under the condition of combustion air provided by the combustion air fan to provide heat; 2. The wet titanium concentrate enters the single-cylinder dryer through the titanium concentrate feeding equipment, is heated by the hot air provided by the fluidized bed furnace, and the moisture is dried; 3. After the drying process is completed, the dry titanium concentrate is discharged from the outlet of the dryer, and the waste gas containing titanium concentrate powder enters the dust collecting system; 4. After being powered by the dust collecting fan, the titanium concentrate powder collected by the cyclone dust collector is directly recycled as a product after being passed through the multi-stage cyclone dust collecting process, entering the spray tower and wet electrostatic precipitator; 5. The fine particle grade titanium concentrate dust is captured in the spray tower and wet electrostatic precipitator, and the spray tower also removes harmful substances such as S in the flotation reagent. The fine particle grade titanium concentrate and the desulfurization waste water are returned to the drying system together, and the flue gas is discharged.
[0005] Although this process can realize the drying and pollution control of the titanium concentrate, it still has obvious deficiencies in the aspects of fine particle material recovery, system anti-enrichment, equipment anti-wear and operation energy consumption, and urgently needs a more efficient, stable and economical drying and dust collecting system. SUMMARY
[0006] In order to solve the above technical problems existing in the prior art, the present application provides a drying and dust collection system suitable for ultra-fine particle grade titanium concentrate, which optimizes the direct drying and dust collection process of titanium concentrate, so as to have the collection capacity for ultra-fine particle grade titanium concentrate and avoid the negative impact of the enrichment behavior of ultra-fine particle grade titanium concentrate on the entire drying system.
[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A drying and dust collection system suitable for ultra-fine particle grade titanium concentrate, comprising: a fluidized bed furnace feeding device, a fluidized bed furnace, a combustion air fan, a titanium concentrate feeding device, a single-cylinder dryer, a cyclone dust collector, a hot air mixing pipe, a hot air mixing valve, an electrostatic-bag dust collector, a dust removal fan, a desulfurization spray tower and a dry titanium concentrate discharging device; The feeding port of the fluidized bed furnace is connected to the fluidized bed furnace feeding device; The air outlet of the combustion air fan leads to the air inlet of the fluidized bed furnace; The feeding port of the single-cylinder dryer is connected to the titanium concentrate feeding device, and the hot air inlet is connected to the hot air outlet of the fluidized bed furnace; The exhaust port of the single-cylinder dryer is connected to the air inlet of the cyclone dust collector; The air outlet of the cyclone dust collector is connected to the air inlet of the electrostatic-bag dust collector; The air outlet of the electrostatic-bag dust collector leads to the air inlet of the desulfurization spray tower through the dust removal fan; Both ends of the hot air mixing pipe are respectively connected to the outlet of the fluidized bed furnace and the tail cover of the single-cylinder dryer; and the hot air mixing valve is arranged on the hot air mixing pipe; The dry material outlet of the single-cylinder dryer, the ash discharge port of the cyclone dust collector and the ash discharge port of the electrostatic-bag dust collector all lead to the dry titanium concentrate discharging device; The desulfurization spray tower is provided with a wastewater outlet leading to the front section of the drying system.
[0008] Further, the dust collection system comprises a single-stage cyclone dust collector, an electrostatic-bag dust collector and a desulfurization spray tower.
[0009] Further, the hot air mixing pipe adjusts the exhaust gas temperature at the exhaust port of the single-cylinder dryer by bypassing part of the high-temperature hot air from the outlet of the fluidized bed furnace to the exhaust port of the single-cylinder dryer.
[0010] Further, the electrostatic-bag dust collector is provided with an electrostatic dust collection section and a bag dust collection section in sequence along the airflow direction.
[0011] Further, the dust removal fan is arranged on the air path between the gas outlet of the electrostatic-bag dust collector and the gas inlet of the desulfurization spray tower.
[0012] Further, the system does not comprise a wet electrostatic precipitator.
[0013] Further, the dry titanium concentrate discharging device for collecting and conveying dry materials from the single-cylinder dryer, the cyclone dust collector and the electrostatic-bag dust collector is one of a screw conveyor, a scraper conveyor or a belt conveyor or a combination thereof.
[0014] Further, the electrostatic-bag dust collector is a combined dust removal device, in which an electrostatic dust removal section and a bag dust removal section are sequentially arranged from front to back, and the gas outlet of the electrostatic dust removal section is in communication with the gas inlet of the bag dust removal section.
[0015] Further, the wastewater outlet of the desulfurization spray tower is connected to an upstream concentration device through a pipeline, which is a device related to the concentration process in the upstream process of the system.
[0016] Further, the filter bag of the bag dust removal section of the electrostatic-bag dust collector is coated or wear-resistant treated.
[0017] The beneficial effects of the present application are as follows: Compared with the prior art, the drying and dust removal system for ultrafine particle grade titanium concentrate has the following technical features and beneficial effects: (1) The electrostatic-bag dust collector is used to replace the original cyclone dust collector, which improves the dust removal efficiency and effectively avoids the enrichment of fine particle grade titanium concentrate particles in the system. (2) Due to the working characteristics of the electrostatic-bag dust collector, the particles in the exhaust gas will have a certain charge after being treated by the electrostatic dust collector, which can effectively improve the collection efficiency of ultrafine particle grade titanium concentrate powder. (3) The present application adds a hot air mixing pipe directly connected to the dryer outlet cover at the outlet of the fluidized bed furnace to ensure the temperature operation of the subsequent electrostatic-bag dust collector. (4) The present application eliminates the wet electrostatic precipitator, which reduces the investment of the titanium concentrate drying system. (5) The application arranges the dust removal fan between the electrostatic-bag dust collector and the desulfurization spray tower, reduces the erosion of water and water vapor in the exhaust gas discharged from the desulfurization spray tower to the dust removal fan, and improves the service life of the dust removal fan. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the present application will be described in detail below in combination with the drawings and detailed embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor. Among them: Figure 1 The system connection schematic diagram of the dry dust collection system suitable for ultra-fine particle grade titanium concentrate of the present application; In the drawing, the reference numerals are: 1-boiling furnace feeding device, 2-boiling furnace, 3-combustion fan, 4-titanium concentrate feeding device, 5-single cylinder dryer, 6-cyclone dust collector, 7-hot air mixing pipe, 8-hot air mixing valve, 9-electrostatic-bag dust collector, 10-dust removal fan, 11-desulfurization spray tower, 12-dry titanium concentrate discharging device. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in combination with the drawings and examples. It should be understood that the specific examples described here are only used to explain the present application, and are not used to limit the present application. The following will be described in combination with the drawings and examples Figure 1 The dry dust collection system suitable for ultra-fine particle grade titanium concentrate is further described.
[0020] Example 1 The purpose of this embodiment is to provide a dry dust collection system suitable for ultra-fine particle grade titanium concentrate, which has the ability to collect ultra-fine particle grade titanium concentrate, avoids the negative impact of the enrichment behavior of ultra-fine particle grade titanium concentrate on the entire drying system, and realizes the above-mentioned purpose through the following technical solutions: A dry dust collection system suitable for ultra-fine particle grade titanium concentrate, comprising a boiling furnace feeding device 1, a boiling furnace 2, a combustion fan 3, a titanium concentrate feeding device 4, a single cylinder dryer 5, a cyclone dust collector 6, a hot air mixing pipe 7, a hot air mixing valve 8, an electrostatic-bag dust collector 9, a dust removal fan 10, and a desulfurization spray tower 11.
[0021] The feed inlet of the fluidized bed furnace 2 is connected to the fluidized bed furnace feed device 1; the air outlet of the combustion air fan 3 leads to the air inlet of the fluidized bed furnace 2; the feed inlet of the single-cylinder dryer 5 is connected to the titanium concentrate feed device 4, and the hot air inlet thereof is connected to the hot air outlet of the fluidized bed furnace 2; the exhaust port of the single-cylinder dryer 5 is connected to the air inlet of the cyclone dust collector 6; the air outlet of the cyclone dust collector 6 is connected to the air inlet of the electrostatic-bag dust collector 9; the air outlet of the electrostatic-bag dust collector 9 leads to the air inlet of the desulfurization spray tower 11 through the dust removal fan 10; the two ends of the hot air mixing pipe 7 are connected to the pipeline between the hot air outlet of the fluidized bed furnace 2 and the hot air inlet of the single-cylinder dryer 5 and the exhaust port of the single-cylinder dryer 5 respectively, and the hot air mixing valve 8 is arranged on the hot air mixing pipe 7; the dry material outlet of the single-cylinder dryer 5, the ash outlet of the cyclone dust collector 6 and the ash outlet of the electrostatic-bag dust collector 9 all lead to the dry titanium concentrate discharge device 12; the desulfurization spray tower 11 is provided with a wastewater outlet leading to the front section of the drying system.
[0022] Fuel enters the fluidized bed furnace 2 and starts to burn to provide heat under the condition that the combustion air fan 3 provides combustion air; wet titanium concentrate enters the single-cylinder dryer 5 through the titanium concentrate feed device 4 and is heated by the hot air provided by the fluidized bed furnace 2 to dry the moisture; after the drying process is completed, dry titanium concentrate is discharged from the outlet of the single-cylinder dryer 5, and waste gas enters the dust removal system for collection of titanium concentrate dust; a hot air mixing pipe 7 is newly added at the outlet of the fluidized bed furnace 2 to directly connect to the outlet cover of the single-cylinder dryer 5 to ensure that the temperature of the waste gas is higher than the dew point; the waste gas is powered by the dust removal fan 10, treated by the cyclone dust collector 6 and then treated again by the electrostatic-bag dust collector 9; finally, the waste gas is desulfurized and dusted by the desulfurization spray tower 11 and then discharged, and the wastewater returns to the front of the drying system.
[0023] Compared with the prior art, the technical features of the present application are: (1) The multi-stage cyclone dust removal system is changed into a single-stage cyclone dust removal plus electrostatic-bag dust removal system; (2) A hot air mixing pipe 7 is newly added at the outlet of the fluidized bed furnace 2 to directly connect to the outlet cover of the single-cylinder dryer 5 to realize temperature control of the flue gas at the outlet of the single-cylinder dryer 5; (3) The last wet electrostatic precipitator is cancelled; (4) The dust removal fan 10 is arranged between the electrostatic-bag dust collector and the desulfurization spray tower 11.
[0024] Example 2 This example serves as a new example or a supplement to Example 1.
[0025] A drying and dust collection system suitable for ultra-fine titanium concentrate, comprising a fluidized bed furnace feeding device 1, a fluidized bed furnace 2, a combustion air fan 3, a titanium concentrate feeding device 4, a single-cylinder dryer 5, a cyclone dust collector 6, a hot air mixing pipe 7, a hot air mixing valve 8, an electrostatic-bag dust collector 9, a desulfurization spray tower 11, and a dry titanium concentrate discharging device 12.
[0026] Fuel enters the fluidized bed furnace 2 through the fluidized bed furnace feeding device 1 and starts to burn under the condition of combustion air provided by the combustion air fan 3 to provide heat. Wet titanium concentrate enters the single-cylinder dryer 5 through the titanium concentrate feeding device 4 and is heated by the hot air provided by the fluidized bed furnace 2 to dry the moisture. After the drying process is completed, the dry titanium concentrate is discharged from the single-cylinder dryer 5 outlet, and the exhaust gas enters the dust collection system for collection of titanium concentrate dust. A new hot air mixing pipe 7 (with a hot air mixing valve 8 on the pipe) is added at the outlet of the fluidized bed furnace 3 to directly connect the outlet of the single-cylinder dryer 5 to ensure that the exhaust gas temperature is higher than the dew point. The exhaust gas is powered by the dust removal fan 10, first passes through the cyclone dust collector 6 for primary treatment, then enters the electrostatic-bag dust collector 9 for secondary dust removal, and finally passes through the desulfurization spray tower 11 for desulfurization treatment before being discharged. The wastewater from the desulfurization spray tower 11 is returned to the drying system. The dry titanium concentrate and dust are respectively discharged from the single-cylinder dryer 3 outlet, the cyclone dust collector 6 outlet, and the electrostatic-bag dust collector 9 outlet, and then enter the dry titanium concentrate discharging device 12. The dry titanium concentrate is transported to the finished product system through the dry titanium concentrate discharging device 12.
[0027] Preferably, the multi-stage cyclone dust collection system is changed to a single-stage cyclone dust collection system plus an electrostatic-bag dust collection system; After the drying process is completed, the dry titanium concentrate is discharged from the single-cylinder dryer 5 outlet, and the exhaust gas enters the dust collection system for collection of titanium concentrate dust. A new hot air mixing pipe 7 (with a hot air mixing valve 8 on the pipe) is added at the outlet of the fluidized bed furnace 3 to directly connect the outlet of the single-cylinder dryer 5 to ensure that the exhaust gas temperature is higher than the dew point; After the exhaust gas is treated by the cyclone dust collector 6, it enters the electrostatic-bag dust collector 9 for secondary dust removal and then enters the desulfurization spray tower 11 for desulfurization treatment before being discharged. The wastewater is returned to the drying system before being discharged. The dry titanium concentrate and dust are respectively discharged from the single-cylinder dryer 3 outlet, the cyclone dust collector 6 outlet, and the electrostatic-bag dust collector 9 outlet, and then enter the dry titanium concentrate discharging device 12. The dry titanium concentrate is transported to the finished product system through the dry titanium concentrate discharging device 12. The dust removal fan 10 is arranged between the electrostatic-bag dust collector and the desulfurization spray tower 11.
[0028] The dry dust collection system provided by the embodiment has a two-stage high-efficiency dust removal combination of "single-stage cyclone dust removal + electrostatic-bag dust removal", and additionally has a hot air pipe for real-time adjustment of waste gas temperature, which not only significantly improves the capture efficiency of the ultrafine particle grade titanium concentrate, but also effectively prevents the circulation enrichment of fine particles in the system, and greatly reduces the wear of the filter bag by dust, thereby prolonging the service life of the key equipment. In addition, the dust removal fan is arranged between the electrostatic-bag dust collector and the desulfurization spray tower, which effectively isolates the corrosion of wet flue gas on the fan, and further enhances the stability and reliability of the system.
[0029] The system has reasonable structure and layout, smooth process connection, and simplified process configuration under the premise of ensuring the drying quality and dust collection effect of the titanium concentrate, avoids the use of a wet electrostatic precipitator, and reduces the investment and operation cost, thereby providing a reliable technical solution for efficient and economic drying of the ultrafine particle grade titanium concentrate, and having a good industrial application prospect.
[0030] Obviously, the above embodiments are merely examples for clear illustration, and are not limitations on the embodiments. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or modifications derived therefrom are still within the protection scope of the present application.
Claims
1. A drying and dust collection system suitable for ultrafine titanium concentrate, characterized in that, include: Fluidized bed furnace feeding equipment (1), fluidized bed furnace (2), combustion fan (3), titanium concentrate feeding equipment (4), single-drum dryer (5), cyclone dust collector (6), heat exchange air duct (7), heat exchange air valve (8), electrostatic-bag dust collector (9), dust removal fan (10), desulfurization spray tower (11) and dry titanium concentrate discharge equipment (12); The feed inlet of the fluidized bed furnace (2) is connected to the fluidized bed furnace feeding device (1). The outlet of the combustion fan (3) leads to the inlet of the fluidized bed furnace (2); The feed inlet of the single-drum dryer (5) is connected to the titanium concentrate feeder (4), and its hot air inlet is connected to the hot air outlet of the fluidized bed furnace (2). The exhaust port of the single-drum dryer (5) is connected to the air inlet of the cyclone dust collector (6); The outlet of the cyclone dust collector (6) is connected to the inlet of the electrostatic-bag dust collector (9); The outlet of the electrostatic bag filter (9) is connected to the inlet of the desulfurization spray tower (11) through the dust removal fan (10); The two ends of the heat exchange air pipe (7) are respectively connected to the outlet of the fluidized bed furnace (2) and the tail cover of the single-drum dryer (5), and the heat exchange air valve (8) is installed on the heat exchange air pipe (7). The dry material outlet of the single-drum dryer (5), the ash discharge port of the cyclone dust collector (6) and the ash discharge port of the electrostatic-bag dust collector (9) all lead to the dry titanium concentrate discharge equipment (12). The desulfurization spray tower (11) is equipped with a wastewater outlet, which leads to the front section of the drying system.
2. The drying and dust collection system for ultrafine titanium concentrate according to claim 1, characterized in that, The dust removal system includes a single-stage cyclone dust collector (6), an electrostatic-bag dust collector (9), and a desulfurization spray tower (11).
3. The drying and dust collection system for ultrafine titanium concentrate according to claim 1, characterized in that, The heat exchange air pipe (7) regulates the exhaust gas temperature by leading a portion of the high-temperature hot air from the outlet of the fluidized bed furnace (2) to the exhaust port of the single-drum dryer (5).
4. The drying and dust collection system for ultrafine titanium concentrate according to claim 1, characterized in that, The electrostatic precipitator (9) has an electrostatic dust removal section and a bag dust removal section arranged sequentially along the airflow direction inside.
5. The drying and dust collection system for ultrafine titanium concentrate according to claim 1, characterized in that, The dust removal fan (10) is installed on the air path between the outlet of the electrostatic bag filter (9) and the inlet of the desulfurization spray tower (11).
6. The drying and dust collection system for ultrafine titanium concentrate according to claim 1, characterized in that, The system does not include a wet electrostatic precipitator.
7. The drying and dust collection system for ultrafine titanium concentrate according to claim 1, characterized in that, The dry titanium concentrate discharge equipment (12) for collecting and conveying dry material from the single-drum dryer (5), cyclone dust collector (6) and electrostatic-bag dust collector (9) is one or a combination of a screw conveyor, scraper conveyor or belt conveyor.
8. The drying and dust collection system for ultrafine titanium concentrate according to claim 1, characterized in that, The electrostatic-bag dust collector (9) is a combined dust removal device. Its interior is provided with an electrostatic dust removal section and a bag dust removal section from front to back. The outlet of the electrostatic dust removal section is connected to the inlet of the bag dust removal section.
9. The drying and dust collection system for ultrafine titanium concentrate according to claim 1, characterized in that, The wastewater outlet of the desulfurization spray tower (11) is connected to the upstream concentration unit via a pipeline.
10. The drying and dust collection system for ultrafine titanium concentrate according to claim 4, characterized in that, The bag filter section of the electrostatic bag filter (9) uses membrane-coated or wear-resistant filter bags.