Harmless recycling system for stone coal vanadium ore vanadium extraction tailings

Abstract

The utility model discloses a stone coal vanadium ore vanadium extraction tailing harmless recycling system which comprises a raw material unit, a mixed ball pressing unit and a converter vanadium extraction unit. According to the utility model, the stone coal vanadium ore vanadium extraction tailings and the vanadium extraction converter dry dedusting ash are uniformly mixed by adding an adhesive into the raw material unit in proportion, and then are conveyed to the converter vanadium extraction unit as a special vanadium-containing cooling agent for vanadium extraction steelmaking operation of the vanadium extraction converter after being subjected to cold pressing, curing, molding and drying by the mixing and ball pressing unit. The vanadium-containing coolant is uniform in component, proper in particle size and high in strength, and the vanadium slag grade and the semisteel metal yield are improved when the vanadium-containing coolant is used in the vanadium extraction and steelmaking process. Therefore, iron and vanadium in the stone coal vanadium ore vanadium extraction tailings are utilized in a resource mode, the stone coal vanadium ore vanadium extraction tailings are treated in a harmless mode, the environment can be protected against pollution, and meanwhile in-furnace cyclic utilization of dry-method dust removal of the vanadium extraction converter is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mineral resource recovery, and in particular relates to a harmless recovery and utilization system for vanadium extraction tailings from stone coal vanadium mines. Background Art

[0002] The V2O5 content in stone coal vanadium ore is only 0.95%, and the vanadium grade is low, resulting in a large amount of tailings after vanadium extraction, which seriously pollutes the environment. Therefore, the comprehensive treatment and resource utilization of vanadium extraction pollutants have become a bottleneck in the development of the stone coal vanadium extraction industry.

[0003] At present, the main vanadium extraction process of stone coal vanadium ore is sodium or calcium roasting-leaching vanadium extraction. Since different roasting processes have a great impact on the utilization of tailings, it is not conducive to comprehensive utilization. At present, the treatment of vanadium tailings is mostly carried out in the form of stockpiling, which not only occupies a large amount of land resources, but also brings serious environmental problems. However, the mass fraction of iron in the vanadium tailings of stone coal vanadium ore can be as high as 40%, and the V2O5 content is also about 1.5%. It is a resource with great utilization value. Therefore, it is necessary to continuously explore and explore the resource utilization of vanadium tailings.

[0004] The main method of extracting vanadium from vanadium-titanium magnetite in my country is to smelt vanadium-containing molten iron in a blast furnace and then produce vanadium slag in a converter steelmaking process. In the prior art, the use of coolants in the converter vanadium extraction process is very common. However, the coolants currently used for vanadium extraction and steelmaking are mainly iron ore and iron oxide scale. If the large amount of iron and vanadium contained in the tailings of vanadium extraction from stone coal can be fully utilized, the grade of vanadium in the converter vanadium slag and the recovery rate of semi-steel metal will be greatly improved. The average TFe content of vanadium steelmaking dust is above 50%, and the vanadium metal element content is relatively high, which also has a high utilization value. Utility Model Content

[0005] The purpose of the utility model is to provide a system for harmless resource utilization of vanadium-extracting tailings from stone coal-vanadium mines, so as to solve the above-mentioned problems existing in the existing stone coal-vanadium-extracting tailings treatment methods, harmlessly dispose of the vanadium-extracting tailings from stone coal-vanadium mines, and resourcefully utilize the precious metal elements such as iron and vanadium in the vanadium-extracting tailings from stone coal-vanadium mines.

[0006] To achieve its purpose, the utility model adopts the following technical solutions:

[0007] A harmless recycling system for vanadium extraction tailings from stone coal vanadium mines, comprising a raw material unit, a mixed briquetting unit and a converter vanadium extraction unit;

[0008] The raw material unit includes a tailings storage bin, a dust storage bin and a binder storage bin, and the bottom discharge ports of the tailings storage bin, the dust storage bin and the binder storage bin are respectively connected to the feed port of the collective scraper;

[0009] The mixing ball pressing unit comprises a mixing bin, the feeding port of the mixing bin is located below the discharging port of the collecting scraper, the discharging port of the mixing bin is connected to the feeding port of the wheel mill, the wheel mill is connected to the ball press and the dryer in sequence, and the discharging port of the dryer is connected to the feeding port at the bottom of the bucket elevator;

[0010] The converter vanadium extraction unit comprises a converter silo located below a top discharge port of a bucket elevator, and a bottom discharge port of the converter silo is connected to a feed port of the vanadium extraction converter.

[0011] As a further improvement of the technical solution of the utility model, the bottom discharge ports of the tailings storage bin, dust ash storage bin and adhesive storage bin are respectively connected to the feed port of the collective scraper conveyor through the first batching metering belt, the second batching metering belt and the third batching metering belt.

[0012] Furthermore, the mixing bin discharge port is connected to the wheel roller feed port through a star feeder.

[0013] Furthermore, the discharge port of the wheel roller is connected to the ball press through a first conveyor belt, and the ball press is connected to the dryer through a second conveyor belt.

[0014] Furthermore, the converter silo is connected to the feed port of the vanadium extraction converter through a vibrating feeding mechanism.

[0015] Furthermore, a dry dust collector is provided on the top of the vanadium extraction converter.

[0016] The beneficial effects of the utility model are:

[0017] The utility model firstly adds a binder to the vanadium extraction tailings of stone coal vanadium mine and the dry dust removal ash of vanadium extraction converter in proportion through the raw material unit, and then cold presses, solidifies, shapes and dries through the mixing and briquetting unit, and then transports it to the converter vanadium extraction unit as a special vanadium-containing coolant for vanadium extraction converter vanadium steelmaking operation. The vanadium-containing coolant has uniform composition, suitable particle size and high strength. The use of the vanadium slag and the recovery rate of semi-steel metal in the vanadium extraction and steelmaking process is improved. Therefore, the utility model makes resource utilization of the iron and vanadium in the vanadium extraction tailings of stone coal vanadium mine, harmlessly disposes of the vanadium extraction tailings of stone coal vanadium mine, can protect the environment from pollution, and at the same time realizes the in-furnace recycling of the dry dust removal ash of the vanadium extraction converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] In the figure: 1. Tailings storage bin; 2. Dust ash storage bin; 3. Adhesive storage bin; 4. First batching metering belt; 5. Second batching metering belt; 6. Third batching metering belt; 7. Collecting scraper; 8. Mixing bin; 9. Star feeder; 10. Wheel roller; 11. First conveyor belt; 12. Second conveyor belt; 13. Ball press; 14. Dryer; 15. Bucket elevator; 16. Converter high-level silo; 17. Vibrating feeder mechanism; 18. Vanadium converter; 19. Dry dust collector. DETAILED DESCRIPTION

[0020] The structure and working process of the utility model are described in detail below with reference to the accompanying drawings.

[0021] Example 1

[0022] A vanadium extraction plant of a stone coal vanadium mine uses sodium salt roasting-water leaching method to extract vanadium from stone coal ore, and the mass fraction of V2O5 in the vanadium extraction tailings of the stone coal vanadium mine is 1.81%, and the mass fraction of Fe2O3 is 48.21%. The vanadium-extracting tailings from the stone coal-vanadium mine are transported to the workshop site by a dump truck, and after screening, the screened material enters the tailings storage bin 1; the dust ash produced by the vanadium-extracting converter steelmaking dry dust collector 19 is sent to the dust ash storage bin 2 by a suction and discharge vehicle, and the average TFe content of the dust ash is 57.26%, and the TFe and vanadium contents in the raw material are high; the modified starch binder is selected and sent to the binder storage bin 3; the vanadium-extracting tailings from the stone coal-vanadium mine are transported to the raw material collecting scraper 7 through the first batching metering belt 4 provided in the tailings storage bin 1; the dust ash is transported to the raw material collecting scraper 7 through the second batching metering belt 5 provided in the dust ash storage bin 2; the modified starch binder is transported to the raw material collecting scraper 7 through the third batching metering belt 6 provided in the binder storage bin 3.

[0023] The raw materials are batched by the scraper 7 and then enter the mixing bin 8. They are fed into the wheel mill 10 through the star feeder 9. After being mixed evenly by the wheel mill 10, they are quantitatively fed into the ball press 13 through the first conveyor belt 11 to be pressed into balls. The semi-finished balls formed by pressing are conveyed to the dryer 14 through the second conveyor belt 12 for drying. The dryer adopts a pelletizing vertical dryer, and the drying heat source uses coke oven gas. The drying temperature is controlled at about 300°C. After drying, the moisture content of the finished balls is ≤3%. The vanadium-containing coolant finally generated has uniform composition, suitable particle size and high strength. When added as a coolant in vanadium-extracting converter steelmaking, it can effectively control the heating rate of the molten pool, increase the vanadium oxidation rate, and help reduce the FeO content in the final slag and increase the semi-steel yield.

[0024] The vanadium-containing coolant after briquetting is loaded into the converter high-level silo 16 through the bucket elevator 15, and the vanadium-containing molten iron obtained by the blast furnace method is loaded into the vanadium-extracting converter 18. In the vanadium-extracting steelmaking process, the vanadium-containing coolant pressed into balls is added to the vanadium-extracting converter 18 through the vibrating feeding mechanism 17. By adjusting the amount of the vanadium-containing coolant added, the vanadium-extracting terminal temperature is controlled at 1386°C, the selective oxidation temperature of C and V elements, to obtain vanadium slag, and the flue gas generated in the vanadium-extracting process is purified by the dry dust collector 19. The stone coal vanadium-extracting tailings are pressed into balls and added as coolants to the vanadium-extracting converter, which improves the vanadium grade and semi-steel metal recovery rate in the vanadium slag, and utilizes the iron and vanadium of the stone coal vanadium-extracting tailings as resources, and harmlessly disposes of the stone coal vanadium-extracting tailings, protecting the environment from pollution.

[0025] Example 2

[0026] A stone coal vanadium extraction plant uses the calcination roasting-leaching vanadium extraction process to extract vanadium from stone coal mines, and the mass fraction of V2O5 in the stone coal vanadium extraction tailings is 1.23%, and the mass fraction of Fe2O3 is 37.57%. The stone coal vanadium tailings are transported to the workshop site by dump trucks, and after screening, the screened materials enter the tailings storage bin 1; the dust ash produced by the vanadium-extracting converter steelmaking dry dust collector 19 is sent to the dust ash storage bin 2 by a suction and discharge vehicle, and the average TFe content of the dust ash is 53.25%, and the TFe and vanadium contents in the raw materials are high; the dust ash is sent to the dust ash storage bin 2 by the suction and discharge vehicle, and the modified starch binder is selected and sent to the binder storage bin 3; the stone coal vanadium tailings are transported to the raw material collecting scraper 7 through the first batching metering belt 4 provided in the tailings storage bin 1; the dust ash is transported to the raw material collecting scraper 7 through the second batching metering belt 5 provided in the dust ash storage bin 2; the modified starch binder is transported to the raw material collecting scraper 7 through the third batching metering belt 6 provided in the binder storage bin 3.

[0027] The raw materials are batched by the scraper 7 and then enter the mixing bin 8. They are fed into the wheel mill 10 through the star feeder 9. After being mixed evenly by the wheel mill 10, they are quantitatively fed into the ball press 13 through the first conveyor belt 11 to be pressed into balls. The semi-finished balls pressed and formed are transported to the dryer 14 for drying through the second conveyor belt 12. The dryer adopts a mesh belt dryer, and the drying heat source uses coke oven gas. The drying temperature is controlled at about 300 ℃. The moisture content of the finished balls after drying is ≤3%. The vanadium-containing coolant finally generated has uniform composition, suitable particle size, and high strength, and is suitable as a vanadium-containing coolant for converter vanadium extraction and steelmaking.

[0028] The vanadium-containing coolant after briquetting is loaded into the high-level material bin 16 of the converter through the bucket elevator 15, and the vanadium-containing molten iron obtained by the blast furnace method is loaded into the vanadium-extracting converter 18. In the vanadium-extracting steelmaking process, the vanadium-containing coolant pressed into balls is added to the vanadium-extracting converter 18 through the vibrating feeding mechanism 17. By adjusting the amount of the vanadium-containing coolant added, the terminal temperature of vanadium extraction is controlled at 1375°C, the selective oxidation temperature of C and V elements, to obtain vanadium slag, and the flue gas generated in the vanadium extraction process is purified by the dry dust collector 19. The stone coal vanadium extraction tailings are pressed into balls and added as coolants to the vanadium extraction converter, which improves the vanadium grade and semi-steel metal recovery rate in the vanadium slag, and utilizes the iron and vanadium of the stone coal vanadium extraction tailings as resources, and harmlessly disposes of the stone coal vanadium extraction tailings to protect the environment from pollution.

Claims

1. A system for harmless recycling of vanadium tailings from stone coal vanadium mines, characterized in that: It includes raw material unit, mixed briquetting unit and converter vanadium extraction unit; The raw material unit comprises a tailings storage bin (1), a dust storage bin (2) and a binder storage bin (3), and the bottom discharge ports of the tailings storage bin (1), the dust storage bin (2) and the binder storage bin (3) are respectively connected to the feed port of the collecting scraper (7); The mixing and briquetting unit comprises a mixing bin (8), the feeding port of the mixing bin (8) is located below the discharging port of the collecting scraper (7), the discharging port of the mixing bin (8) is connected to the feeding port of the wheel mill (10), the wheel mill (10) is connected to the briquetting machine (13) and the dryer (14) in sequence, and the discharging port of the dryer (14) is connected to the bottom feeding port of the bucket elevator (15); The converter vanadium extraction unit comprises a converter silo (16) located below a top discharge port of a bucket elevator (15), and a bottom discharge port of the converter silo (16) is connected to a feed port of a vanadium extraction converter (18).

2. The harmless recycling system for vanadium extraction tailings from stone coal vanadium mines according to claim 1 is characterized in that: The bottom discharge ports of the tailing storage bin (1), the dust storage bin (2) and the binder storage bin (3) are respectively connected to the feed port of the collecting scraper (7) through the first batching metering belt (4), the second batching metering belt (5) and the third batching metering belt (6).

3. The harmless recycling system for vanadium extraction tailings from stone coal vanadium mines according to claim 1 is characterized in that: The material outlet of the mixing bin (8) is connected to the material inlet of the wheel mill (10) via a star-shaped feeder (9).

4. The harmless recycling system for vanadium extraction tailings from stone coal vanadium mines according to claim 1 is characterized in that: The discharge port of the wheel roller (10) is connected to the ball press (13) via a first conveyor belt (11), and the ball press (13) is connected to the dryer (14) via a second conveyor belt (12).

5. The harmless recycling system for vanadium extraction tailings from stone coal vanadium mines according to claim 1 is characterized in that: The converter silo (16) is connected to the feed port of the vanadium extraction converter (18) via a vibrating feeder mechanism (17).

6. A system for harmless recycling of vanadium-extracting tailings from stone coal-vanadium mines according to any one of claims 1 to 5, characterized in that: A dry dust collector (19) is provided on the top of the vanadium extraction converter (18).

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