Three-section grinding separation device for vanadium-titanium magnetite concentrate

Abstract

The utility model provides a vanadium-titanium magnetite concentrate three-section grinding separation device which comprises an ore separation box, the ore separation box is provided with a feeding end and a discharging end; the upgrading raw ore tank is connected with the feeding end; the cyclone is connected with the discharging end; the cyclone is provided with a tower mill; a feeding hole of the magnetic separator is connected with a discharging hole of the cyclone; the magnetic separator is provided with a tailing outlet and a magnetic separation outlet; the filtering machine is connected with the magnetic separation ore outlet; and the filter is provided with a concentrate outlet. Compared with the prior art, the three-section grinding and separation device for the vanadium-titanium magnetite concentrates adopts a specific structure and a connection relation, realizes better integral interaction, effectively improves the quality of the vanadium-titanium magnetite concentrates through three-section grinding and separation, ensures that the quality of the vanadium-titanium magnetite concentrates is improved and the yield is stable, continuously reduces the beneficiation production cost and the ironmaking cost, and improves the quality of the vanadium-titanium magnetite concentrates. And the requirement of an existing blast furnace on vanadium-titanium magnetite concentrate materials is met.

Description

Technical Field

[0001] This utility model relates to the field of three-stage grinding and beneficiation technology of vanadium-titanium magnetite concentrate, and more specifically, to a three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate. Background Technology

[0002] Currently, although the original process structure of vanadium-titanium magnetite concentrate production in mineral processing enterprises is reasonable, the on-site process layout is compact, and the operation is relatively stable, with the industry's new requirements such as the simultaneous promotion of "refined raw material policy," green development, and increased use of vanadium-titanium magnetite concentrate, the existing blast furnaces have increasingly higher requirements for the quality and output of vanadium-titanium magnetite concentrate. At the same time, as Zhulan mining enters deeper mining, the ore crystallization particle size becomes finer, the grade of raw ore decreases, and the proportion of refractory and difficult-to-grind ore increases, resulting in a year-on-year increase in the beneficiation ratio of vanadium-titanium magnetite concentrate, and a year-on-year decrease in the quality and output of vanadium-titanium magnetite concentrate.

[0003] Due to the above factors, the supply-demand imbalance between the quality and output of vanadium-titanium magnetite concentrate produced by mineral processing enterprises and the industry's smelting production needs is becoming increasingly prominent. Therefore, it is necessary for mineral processing enterprises to take advantage of the current favorable market opportunities to accelerate the transformation of mineral processing technology. Currently, with the grade of incoming ore decreasing year by year, the quality and output of vanadium-titanium magnetite concentrate produced by the two-stage grinding and beneficiation process are also decreasing annually. The TFe grade of vanadium-titanium magnetite concentrate is 53.6%, and the annual production of vanadium-titanium magnetite concentrate is 4.55 million tons, which is insufficient to meet the current demand for vanadium-titanium magnetite concentrate feedstock in blast furnaces. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate. Through three-stage grinding and beneficiation, the quality of vanadium-titanium magnetite concentrate can be effectively improved, ensuring the stable production of vanadium-titanium magnetite concentrate with improved quality, continuously reducing the cost of mineral processing and ironmaking, and ensuring that the demand of existing blast furnaces for vanadium-titanium magnetite concentrate is met.

[0005] This utility model provides a three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate, comprising:

[0006] Mineral distribution box; the mineral distribution box is provided with a feed end and a discharge end;

[0007] The upgrading raw ore pool is connected to the feed end;

[0008] A hydrocyclone connected to the discharge end; the hydrocyclone is equipped with a tower mill;

[0009] A magnetic separator with its feed inlet connected to the discharge outlet of the hydrocyclone; the magnetic separator is provided with a tailings outlet and a magnetic ore outlet;

[0010] A filter connected to the magnetic separation outlet; the filter is provided with a concentrate outlet.

[0011] Preferably, the upgraded ore in the upgraded ore pool is vanadium-titanium magnetite concentrate produced by two-stage grinding and beneficiation.

[0012] Preferably, the upgraded raw ore pool is provided in multiple groups, and each group of upgraded raw ore pools is connected to the feed end through pipelines.

[0013] Preferably, the hydrocyclone has 6 to 10 groups, and each group of hydrocyclones is connected to the discharge end.

[0014] Preferably, the tower mill and the hydrocyclone form a closed loop; the material after being ground by the tower mill is classified by the hydrocyclone and then sent to the magnetic separator.

[0015] Preferably, the tailings outlet is connected to the tailings conveying system.

[0016] This utility model provides a three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate, comprising: a ore distribution box; the ore distribution box having a feed end and a discharge end; a raw ore upgrading pool connected to the feed end; a hydrocyclone connected to the discharge end; the hydrocyclone having a tower mill; a magnetic separator connected to the feed inlet and the discharge outlet of the hydrocyclone; the magnetic separator having a tailings outlet and a magnetic separation outlet; a filter connected to the magnetic separation outlet; and a concentrate outlet of the filter. Compared with the prior art, the three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate provided by this utility model adopts a specific structure and connection relationship to achieve better overall interaction. Through three-stage grinding and beneficiation, the quality of vanadium-titanium magnetite concentrate is effectively improved, ensuring stable production and quality improvement of vanadium-titanium magnetite concentrate, continuously reducing beneficiation and ironmaking costs, and ensuring that the demand for vanadium-titanium magnetite concentrate from existing blast furnaces is met.

[0017] Meanwhile, the three-stage grinding and beneficiation method for vanadium-titanium magnetite concentrate provided by this utility model can improve the quality of vanadium-titanium magnetite concentrate and has good economic and social benefits. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of the three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate provided in this embodiment of the utility model;

[0019] Figure 2 This is a graph showing the relationship between grinding fineness and grinding time in an embodiment of this utility model. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] This utility model provides a three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate, comprising:

[0022] Mineral distribution box; the mineral distribution box is provided with a feed end and a discharge end;

[0023] The upgrading raw ore pool is connected to the feed end;

[0024] A hydrocyclone connected to the discharge end; the hydrocyclone is equipped with a tower mill;

[0025] A magnetic separator with its feed inlet connected to the discharge outlet of the hydrocyclone; the magnetic separator is provided with a tailings outlet and a magnetic ore outlet;

[0026] A filter connected to the magnetic separation outlet; the filter is provided with a concentrate outlet.

[0027] This utility model, based on the actual production situation of vanadium-titanium magnetite concentrate in mineral processing enterprises, aims to meet the new requirements of industry innovation and green development. Addressing the industry's "refined raw material policy" and the increasing use of vanadium-titanium magnetite concentrate, it delves into internal potential. Specifically, it addresses the challenges of the Zhulan mine's deepening operations, resulting in finer ore crystals, lower ore grades, and an increased proportion of difficult-to-grind and difficult-to-process ores. This leads to a gradual increase in the beneficiation ratio of vanadium-titanium magnetite concentrate, and a year-on-year decline in its quality and yield. By actively utilizing current favorable market opportunities and striving for innovation, this model promotes the transformation of vanadium-titanium magnetite concentrate production processes in mineral processing enterprises using a three-stage grinding and beneficiation process. The original ore was produced through a two-stage grinding and beneficiation process. Through this three-stage grinding and beneficiation process, the TFe grade of the vanadium-titanium magnetite concentrate increased from 53.6% to over 55%, achieving an annual production of 4.6 million tons of vanadium-titanium magnetite concentrate. This achieves the goal of improving quality and stabilizing production, effectively reducing production costs for mineral processing enterprises and existing iron smelters, and creating significant economic and social benefits. It has significant reference and promotion value for existing mineral processing enterprises.

[0028] In this utility model, the three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate includes: a ore separating box, an upgraded raw ore pool, a hydrocyclone, a tower mill, a magnetic separator, and a filter.

[0029] In this utility model, the ore sorting box is used to collect and summarize the vanadium-titanium magnetite concentrate to be processed; the ore sorting box is provided with a feed end and a discharge end; wherein, the feed end is connected to the upgrading raw ore pool; and the discharge end is connected to the hydrocyclone.

[0030] In this invention, the upgraded raw ore pool is used to receive and store vanadium-titanium magnetite concentrate to be processed; the upgraded raw ore in the upgraded raw ore pool is preferably vanadium-titanium magnetite concentrate produced by two-stage grinding and beneficiation.

[0031] In this invention, the upgrading raw ore pool is preferably provided in multiple groups, more preferably in four groups; the groups are connected in parallel with each other, and each group of upgrading raw ore pools is connected to the feed end through a pipeline.

[0032] In this invention, the hydrocyclone is preferably provided in 6 to 10 groups, more preferably in 8 groups; each group is connected in parallel with each other, and each group of hydrocyclones is connected to the discharge end.

[0033] In this invention, the hydrocyclone is used to classify the material after grinding; the hydrocyclone is equipped with a tower mill, which is used for grinding.

[0034] In this invention, the tower mill and the hydrocyclone preferably form a closed loop; the material after being ground by the tower mill is classified by the hydrocyclone and sent to the magnetic separator for subsequent magnetic separation.

[0035] In this invention, the outlet of the hydrocyclone is connected to the inlet of the magnetic separator; the magnetic separator is provided with a tailings outlet and a magnetic separation outlet; wherein, the tailings outlet is preferably connected to a tailings conveying system for further processing of the tailings; the magnetic separation outlet is connected to the filter.

[0036] In this invention, the filter is used to filter magnetic ore to obtain vanadium-titanium magnetite concentrate after three-stage grinding and beneficiation; the filter is provided with a concentrate outlet for discharging the vanadium-titanium magnetite concentrate after three-stage grinding and beneficiation.

[0037] This utility model also provides a three-stage grinding and beneficiation method for vanadium-titanium magnetite concentrate, using the three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate described above, including the following steps:

[0038] The vanadium-titanium magnetite concentrate to be processed is fed into the ore sorting box, and then the material after grinding is sequentially classified and magnetically separated by a hydrocyclone to obtain tailings and magnetically separated ore respectively; wherein, the magnetically separated ore is filtered to obtain vanadium-titanium magnetite concentrate after three stages of grinding and separation.

[0039] This invention does not impose any special restrictions on the source of the vanadium-titanium magnetite concentrate to be processed, and adopts vanadium-titanium magnetite concentrate produced by a two-stage grinding and beneficiation process in a mineral processing enterprise that is well known to those skilled in the art.

[0040] In this invention, the TFe grade of the vanadium-titanium magnetite concentrate to be processed is preferably less than or equal to 54%.

[0041] In this invention, the particle size of the grading is preferably less than or equal to -325 mesh before subsequent magnetic separation.

[0042] In this utility model, the three-stage grinding and beneficiation method for vanadium-titanium magnetite concentrate preferably further includes:

[0043] The tailings are concentrated.

[0044] This utility model provides a three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate. Vanadium-titanium magnetite concentrate is an important raw material for existing blast furnaces in mineral processing enterprises. The requirements for the quality and output of vanadium-titanium magnetite concentrate in blast furnaces are increasing. In order to meet the new requirements of industry innovation and green development and ensure that blast furnaces have "safe feed", this utility model addresses the industry's "refined raw material policy" and the actual situation of increasing the use of vanadium-titanium magnetite concentrate. It taps into internal potential and addresses the production reality that Zhulan mining has entered deep mining, the ore crystallization particle size has become finer, the raw ore grade has decreased, and the proportion of difficult-to-grind and difficult-to-benefit ores has increased. As a result, the beneficiation ratio of vanadium-titanium magnetite concentrate has increased year by year, and the grade of vanadium-titanium magnetite concentrate has decreased year by year. It actively takes advantage of the current favorable market opportunities, strives for innovation, and actively promotes the transformation of vanadium-titanium magnetite concentrate upgrading processes in mineral processing enterprises. The upgrading process for vanadium-titanium magnetite concentrate in mineral processing enterprises adopts a new three-stage grinding and beneficiation process. The raw ore is vanadium-titanium magnetite concentrate produced by two-stage grinding and beneficiation in mineral processing enterprises. After fine grinding and separation through the three-stage grinding and beneficiation process, the TFe grade of vanadium-titanium magnetite concentrate is increased from 53.6% to over 55%, and the annual output of vanadium-titanium magnetite concentrate exceeds 4.6 million tons. This reduces the production costs of mineral processing enterprises and existing ironmaking plants, creating good economic and social benefits for the industry.

[0045] Beneficial Effect 1: The vanadium-titanium magnetite concentrate produced by the original two-stage grinding and beneficiation process of mineral processing enterprises is difficult to meet the market's production requirements for the quantity and quality of vanadium-titanium magnetite concentrate. This utility model changes the two-stage grinding and beneficiation process to a three-stage grinding and beneficiation process, which increases the TFe grade of vanadium-titanium magnetite concentrate from 53.6% to more than 55%, thereby reducing the production cost of mineral processing enterprises.

[0046] Beneficial effect 2: After the vanadium-titanium magnetite concentrate is upgraded, the existing blast furnaces can meet the demand for vanadium-titanium magnetite concentrate, thus reducing the cost of ironmaking.

[0047] Benefit 3: Effective measures to reduce carbon emissions have yielded good social benefits.

[0048] Experimental results show that the above-mentioned three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate can increase the TFe grade of vanadium-titanium magnetite concentrate in beneficiation enterprises from 53.6% to over 55%, reduce the cost of the entire industrial chain, conform to the industry development strategy, and achieve good economic and social benefits, saving enterprises 47.426 million yuan annually.

[0049] This utility model provides a three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate, comprising: a ore distribution box; the ore distribution box having a feed end and a discharge end; a raw ore upgrading pool connected to the feed end; a hydrocyclone connected to the discharge end; the hydrocyclone having a tower mill; a magnetic separator connected to the feed inlet and the discharge outlet of the hydrocyclone; the magnetic separator having a tailings outlet and a magnetic separation outlet; a filter connected to the magnetic separation outlet; and a concentrate outlet of the filter. Compared with the prior art, the three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate provided by this utility model adopts a specific structure and connection relationship to achieve better overall interaction. Through three-stage grinding and beneficiation, the quality of vanadium-titanium magnetite concentrate is effectively improved, ensuring stable production and quality improvement of vanadium-titanium magnetite concentrate, continuously reducing beneficiation and ironmaking costs, and ensuring that the demand for vanadium-titanium magnetite concentrate from existing blast furnaces is met.

[0050] To further illustrate this utility model, the following embodiments will be described in detail.

[0051] 1. Current status of vanadium-titanium magnetite concentrate production and the necessity of upgrading and stabilizing production:

[0052] Currently, the mineral processing enterprises mainly handle primary vanadium-titanium magnetite ore produced from the Zhulan mining area, using a two-stage grinding and beneficiation process. To achieve green and energy-saving development, these enterprises must actively innovate, continuously explore methods to improve the quality and ensure the yield of vanadium-titanium magnetite concentrate, and actively modify the existing two-stage grinding and beneficiation process to effectively reduce the production costs of vanadium-titanium magnetite concentrate and ironmaking costs.

[0053] 1.1 Current Status of Vanadium-Titanium Magnetite Concentrate Production:

[0054] The vanadium-titanium magnetite concentrate production grinding and beneficiation system of the mineral processing enterprise currently has 16 grinding and beneficiation production series. At present, it mainly processes primary vanadium-titanium magnetite produced from the Zhulan mining site. The grinding and beneficiation system adopts a two-stage grinding and beneficiation process. The first stage grinding uses MQG3640 / 3645 / 3650 grid ball mill and Φ660×2 hydrocyclone group (1 in use and 1 in standby) to form a closed-circuit grinding. The overflow of the first stage hydrocyclone (-200 mesh, content 35~42%) is gravity-flow roughing CTBΦ1230 semi-countercurrent permanent magnet drum magnetic separator. The roughing concentrate flows into the second stage hydrocyclone pump pool by gravity. The two-stage closed-circuit grinding uses an MQY2736 / 2740 overflow ball mill. The classification equipment consists of a Φ350×6 hydrocyclone group (3 in use and 3 in standby) and a high-frequency fine screen. The high-frequency fine screen is used to control and classify the overflow of the hydrocyclones. The product on the screen is combined with the underflow of the hydrocyclones and returned to the two-stage ball mill for regrinding. The product under the screen (-200 mesh content 65-70%) enters the cleaning process I and II. The cleaning process I uses a CTB1030 / 1230 semi-countercurrent permanent magnet drum separator, and the cleaning process II uses a CTB1030 / 1230 semi-countercurrent permanent magnet drum separator. The tailings of the cleaning processes I and II are combined and fed into the scavenging process. The scavenging tailings are the final tailings. The scavenging concentrate is returned to the two-stage grinding for regrinding. The concentrate from the cleaning process II is fed by gravity into the concentrate pump pool (1-4#) and then enters the concentrate first station. It is then transported to the ironmaking plant via the concentrate pipeline transportation system. Due to the deteriorating ore properties and the increasing proportion of ore that is difficult to grind and process, mineral processing enterprises can only process about 13 million tons of raw ore per year and produce about 4.55 million tons of vanadium-titanium magnetite concentrate with a TFe grade of 53.6% per year. This is insufficient to meet the current demand for vanadium-titanium magnetite concentrate from blast furnaces.

[0055] 1.2 Necessity for Upgrading and Stabilizing the Production of Vanadium-Titanium Magnetite Concentrate:

[0056] Climate change is a global problem facing humanity. With the surge in carbon dioxide emissions from various countries, greenhouse gases are increasing dramatically, threatening living systems. Current steel production relies heavily on long-process methods such as blast furnaces and converters, with fossil fuels like coal and coke accounting for nearly 90% of energy inputs. The carbon emission intensity is approximately 1.2 times that of advanced levels, making carbon reduction extremely difficult and urgently requiring accelerated research and development of carbon reduction and recycling technologies. After the upgrading and transformation of ore dressing enterprises, the grade of vanadium-titanium magnetite concentrate is expected to increase to over 55%, which can improve the grade of ore entering the furnace by more than 0.7 percentage points, saving approximately 40,000 tons of coke annually and reducing carbon dioxide emissions by approximately 100,000 tons annually. This is an effective measure to reduce carbon emissions.

[0057] To enhance core market competitiveness, this utility model proposes a "refined feedstock" strategy to improve blast furnace burden structure, reduce coke ratio, increase blast furnace utilization coefficient, and reduce the amount of iron ore purchased from external sources, thereby lowering production costs. Production practice has proven that a 1% increase in the TFe grade of the feedstock reduces the coke ratio by 2%, increases the blast furnace utilization coefficient by 3%, and significantly improves the quality of vanadium-titanium magnetite concentrate, resulting in substantial economic benefits. Meanwhile, beneficiation enterprises are increasingly affected by the deteriorating ore properties and the rising proportion of refractory ores. They process approximately 13 million tons of raw ore annually, producing about 4.55 million tons of vanadium-titanium magnetite concentrate with a TFe grade of 53.6%, which is insufficient to meet the quality and quantity requirements of existing blast furnaces for vanadium-titanium magnetite concentrate. Therefore, improving the quality and ensuring the output of vanadium-titanium magnetite concentrate is an urgent task for beneficiation enterprises.

[0058] In conclusion, it is essential for mineral processing enterprises to implement process transformation for vanadium-titanium magnetite concentrate production. This is a necessary means for the industry to promote technological innovation, improve quality and stabilize production, save energy and reduce consumption, and achieve green development.

[0059] 2. Analysis of the difficulties in improving the quality of vanadium-titanium magnetite concentrate:

[0060] As the Zhulan mining site has entered deep mining, the ore properties have deteriorated year by year. It is difficult to separate ilmenite and ilmenite crystals in vanadium-titanium magnetite into individual particles. The existing beneficiation equipment cannot meet the quality improvement requirements of vanadium-titanium magnetite concentrate, and the existing output of vanadium-titanium magnetite concentrate cannot meet the production needs of the existing blast furnace. It is necessary to upgrade and transform the existing vanadium-titanium magnetite concentrate production process.

[0061] 2.1 As mining progresses to deeper levels, the properties of the ore deteriorate year by year:

[0062] Based on the actual production situation of the Panzhihua Iron Mine open-pit mine, the trend of increasingly higher proportions of refractory ore in the Zhulan mine is unlikely to reverse for a considerable period of time. The quality and output of vanadium-titanium magnetite concentrate will decline year by year, and the supply-demand imbalance will intensify sharply with increasing competitive pressure from the steel industry. The production of vanadium-titanium magnetite concentrate by beneficiation enterprises is constrained by the conditions of the Zhulan mine. The nature of the ore from the mine is deteriorating year by year, with the proportion of non-refractory ore decreasing and the proportion of refractory ore increasing, and the ore particle size becoming finer. This has a significant impact on the production of vanadium-titanium magnetite concentrate by beneficiation enterprises. In 2021, the grade of ore from the Zhulan mine was 28.24%, and the output of vanadium-titanium magnetite concentrate was 4.7753 million tons; in 2022, the grade was 28.08%, and the output was 4.7459 million tons; in 2023, the grade was 27.25%, and the output was 4.6732 million tons. The statistics on mine operations and production from 2021 to 2023 are shown in the table below.

[0063] Statistical table of mine visits and production from 2021 to 2023

[0064] project 2021 2022 2023 Ore arrival volume (10,000 tons) 1363.64 1363.27 1348.09 Ore grade (%) 28.24 28.08 27.25 Vanadium-titanium magnetite concentrate production (10,000 tons) 477.53 474.59 467.32

[0065] 2.2 Ilmenite and ilmenite crystals in vanadium-titanium magnetite are difficult to separate into individual particles:

[0066] According to the "Experimental Research Report on Upgrading and Impurity Reduction of Vanadium-Titanium Magnetite Concentrate" completed by the Institute of Mineral Resources Comprehensive Utilization, Chinese Academy of Geological Sciences in 2017, the properties of vanadium-titanium magnetite concentrate currently produced by mineral processing enterprises were analyzed. The grade and main mineral content of vanadium-titanium magnetite concentrate are shown in the table below.

[0067] Vanadium-titanium magnetite concentrate grade and main mineral content in mineral processing enterprises

[0068]

[0069] Note: Ilmenite refers to figurative and platy ilmenite and ilmenite crystals of 0.5–5 μm in size. In MLA testing, minerals larger than 1 μm in electron beam diameter can be quantitatively analyzed. However, in beneficiation tests, these minerals cannot be liberated individually. A small amount of amphibole in gangue is included in the pyroxene calculation.

[0070] In the vanadium-titanium magnetite concentrate of the beneficiation enterprise, the contents of titanomagnetite, sulfide minerals and gangue minerals are 78.98%, 1.80% and 6.68%, respectively. Magnetic separation mainly recovers titanomagnetite from the vanadium-titanium magnetite concentrate. Its theoretical concentrate grade is 60.00% and its theoretical yield is 78.98%.

[0071] The morphological and platy 0.5–5 μm ilmenite and ilmenite crystals (ilmenite type) present in vanadium-titanium magnetite cannot be liberated individually in beneficiation tests. The existing two-stage grinding process is difficult to further improve the quality of vanadium-titanium magnetite concentrate while ensuring output.

[0072] 2.3 Existing mineral processing equipment cannot meet the requirements for quality improvement:

[0073] The mineral processing plant's grinding and beneficiation system employs a two-stage grinding and beneficiation process. The first-stage grinding uses an MQG3640 / 3645 / 3650 grid-type ball mill and a Φ660×2 hydrocyclone assembly (1 in operation, 1 standby) in a closed-circuit system. The overflow from the first-stage hydrocyclone (-200 mesh, 35-42% content) is gravity-flowed into a CTBΦ1230 semi-countercurrent permanent magnet drum separator for roughing. The roughing concentrate then flows by gravity into the second-stage hydrocyclone pump pool. The second-stage closed-circuit grinding uses an MQY2736 / 2740 overflow-type ball mill, with classification equipment consisting of a Φ350×6 hydrocyclone assembly (3 in operation, 3 standby) and a high-frequency fine screen. The ore quality at the Zhulan mining site has deteriorated year by year, with a decreasing proportion of easily ground and beneficiated ore, increasing concentrate particle size, decreasing concentrate processing time, and a declining trend in both the yield and quality of vanadium-titanium magnetite concentrate. If mineral processing enterprises continue to use the two-stage grinding and beneficiation process, based on the current ore characteristics of the Zhulan mining area, the annual output of vanadium-titanium magnetite concentrate will be approximately 4.55 million tons, with a grade of 53.6%, which is insufficient to meet the current blast furnace demand for vanadium-titanium magnetite concentrate. According to experimental research by the Mining Research Institute and the mineral processing enterprise's research team, the vanadium-titanium magnetite concentrate grade needs to reach over 55%, and the particle size of -325 mesh needs to reach over 86%. The current two-stage grinding process cannot meet the concentrate particle size requirements for upgrading vanadium-titanium magnetite concentrate. Therefore, the existing mineral processing equipment cannot meet the requirements for upgrading vanadium-titanium magnetite concentrate, and the existing grinding and beneficiation equipment must be upgraded. A statistical table of vanadium-titanium magnetite concentrate particle size from 2021 to 2023 is provided.

[0074] Statistical table of vanadium-titanium magnetite concentrate particle size from 2021 to 2023

[0075] project 2021 2022 2023 Ore grade (%) 28.24 28.08 27.25 Concentrate Particle Size % 64.28 70.84 77.47 Concentrate per hour (tons / hour) 35.8 35.44 34.89

[0076] 3. Measures to improve the quality of vanadium-titanium magnetite concentrate:

[0077] To enhance their core competitiveness, mineral processing enterprises are actively promoting technological breakthroughs in vanadium-titanium ferromagnetic concentrate and upgrading processes for vanadium-titanium magnetite concentrate, continuously improving its quality while ensuring output. To provide reference and basis for selecting upgrading mills, the mineral processing enterprise commissioned the Panzhihua Iron and Steel Research Institute to conduct grindability tests on the raw ore. The raw ore for this upgrading was vanadium-titanium magnetite concentrate produced by the enterprise's two-stage grinding and beneficiation process. The concentrate is then piped to the newly built three-stage grinding and beneficiation system. The three-stage grinding and beneficiation upgrading process project has increased the TFe grade of the vanadium-titanium magnetite concentrate to over 55%, with an annual output of 4.6 million tons. This reduces production costs across the entire industry chain and creates significant economic and social benefits for the industry.

[0078] 3.1 Conduct industrial tests based on changes in ore properties:

[0079] To provide reference and basis for the selection of upgrading mills, the mineral processing company commissioned the Panzhihua Iron and Steel Research Institute to conduct grindability tests on the raw ore for upgrading. The raw ore for upgrading was vanadium-titanium magnetite concentrate produced by the mineral processing company through two-stage grinding and beneficiation. The vanadium-titanium magnetite concentrate of the mineral processing company flows by gravity through pipelines to the newly built grinding and beneficiation system.

[0080] To enhance research on ore property changes and provide reference and basis for the selection of mills for the main equipment of vanadium-titanium magnetite concentrate upgrading, the mineral processing enterprise commissioned the Panzhihua Iron and Steel Research Institute to conduct grindability tests on the raw ore for upgrading. The test samples were the enterprise's vanadium-titanium magnetite concentrate and a benchmark sample for analysis and comparison. The test method involved removing the -325 mesh particle size from the samples and conducting grinding tests under different time conditions. The relationship between grinding time and -325 mesh content is shown in the graph. Figure 2 .

[0081] The graph shows that the time required to grind the ore sample from the mineral processing plant to -325 mesh with a content of 86% was 22.4 min, and the time required for the benchmark ore sample was 18.4 min. The grinding coefficient was calculated using the formula.

[0082]

[0083] In the formula: KX: refers to the relative grindability coefficient of the ore sample from the concentrator; TO: the time required to grind the ore sample from the concentrator to the specified particle size; TX: the time required to grind the benchmark ore sample to the specified particle size.

[0084] The relative grindability coefficient indicates that vanadium-titanium magnetite concentrate from beneficiation plants is more difficult to grind than the benchmark vanadium-titanium magnetite concentrate. The frenulum-like and platy 0.5–5 μm ilmenite and ilmenite crystals (ilmenite-type) present in the vanadium magnetite found in beneficiation plants cannot be liberated individually during beneficiation tests. Therefore, to improve the quality of vanadium-titanium magnetite concentrate, beneficiation plants must add a three-stage grinding process.

[0085] Example

[0086] The upgraded raw ore is vanadium-titanium magnetite concentrate produced by two-stage grinding and beneficiation in a mineral processing enterprise. It flows by gravity through pipelines to a newly built three-stage grinding and beneficiation unit for vanadium-titanium magnetite concentrate.

[0087] The renovation of the three-stage grinding and beneficiation unit includes: selecting a plant site 30 meters below the fine-grained plant in the roughing area of ​​the mineral processing enterprise, where the terrain is open and convenient for plant construction and equipment installation; constructing a new three-stage grinding and beneficiation plant and auxiliary facilities; the incoming ore for the three-stage grinding and beneficiation unit is vanadium-titanium magnetite concentrate produced after two-stage staged grinding and beneficiation; the grinding process uses 8 tower mills, each with a motor power of 1120 kW·h; the classification process uses 8 hydrocyclones, model Φ350×11 hydrocyclone groups; the fine magnetic separation process uses 8 CTB1230 multi-pole permanent magnet drum separators; the tailings thickening process uses a Φ30m high-efficiency thickener; one large-well thickening system; and the filtration process uses 8 ZPG72 / 9 double vacuum disc filters. The main equipment of the three-stage grinding and beneficiation unit is shown in Table 1 below.

[0088] Table 1

[0089]

[0090]

[0091] The production process of the three-stage grinding and screening device provided in the embodiment is divided into 8 grinding and screening series. See the structural schematic diagram. Figure 1 As shown.

[0092] The vanadium-titanium magnetite concentrate with a content of about 53.6% produced by the two-stage grinding and beneficiation of 16 ball mills in the mineral processing enterprise is used as the raw ore for upgrading in the three-stage grinding and beneficiation system. The vanadium-titanium magnetite concentrate produced by every 4 ball mill systems enters the No. 1, No. 2, No. 3, and No. 4 upgrading raw ore pools respectively, and then flows by gravity through pipelines to the distribution box, which is evenly distributed to the 8 grinding and beneficiation series.

[0093] In the mineral processing plant, the three-stage grinding and beneficiation unit distributes the upgraded raw ore evenly to eight hydrocyclones via pipeline gravity flow for classification. Upgraded raw ore with a particle size equal to or less than -325 mesh enters the magnetic separator for separation. Vanadium-titanium magnetite concentrate enters the filter to produce vanadium-titanium magnetite concentrate, while tailings directly enter the tailings conveying system.

[0094] After the upgraded raw ore is classified by the hydrocyclone in the three-stage grinding and beneficiation unit, the upgraded raw ore with a particle size greater than -325 mesh enters the tower mill for fine grinding. After fine grinding, the upgraded raw ore is returned to the hydrocyclone for classification again, forming a closed loop to ensure the classification effect and meet the requirement of the three-stage grinding unit to achieve a fineness of over 86% of -325 mesh.

[0095] The upgrading process modification project of the three-stage grinding and beneficiation device provided in this embodiment of the utility model enables mineral processing enterprises to achieve a grinding fineness of over -325 mesh at over 86%, increase the TFe grade of vanadium-titanium magnetite concentrate from 53.6% to over 55%, and increase the annual production of vanadium-titanium magnetite concentrate from 4.55 million tons to 4.6 million tons. This achieves the requirements and objectives of the three-stage grinding and beneficiation upgrading process modification, bringing the production of vanadium-titanium magnetite concentrate in mineral processing enterprises to a new level. A comparison table of production data before and after the three-stage grinding and beneficiation device modification is shown in Table 2 below.

[0096] Table 2

[0097]

[0098]

[0099] Experimental results show that the upgrading process project implemented by the three-stage grinding and beneficiation device provided in this embodiment of the invention, under the condition that the grade of the ore from the mine has been greatly reduced, has increased the particle size of vanadium-titanium magnetite concentrate from 67.69% to 87.81%, the TFe grade of vanadium-titanium magnetite concentrate from 53.6% to over 55%, and the annual output of vanadium-titanium magnetite concentrate from 4.55 million tons to over 4.6 million tons, achieving the effect of upgrading quality and stabilizing production, and effectively reducing the production cost of vanadium-titanium magnetite concentrate and ironmaking production costs of ore beneficiation enterprises.

[0100] In summary, this utility model provides a three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate, with the following beneficial effects: The upgrading process implemented by the three-stage grinding and beneficiation device has increased the TFe grade of vanadium-titanium magnetite concentrate in mineral processing enterprises from 53.6% to over 55%, reducing the production costs of mineral processing enterprises and iron smelting plants, which is in line with the industry development strategy and has achieved good economic and social benefits; at the same time, the vanadium-titanium magnetite concentrate grade of mineral processing enterprises has increased from 53.6% to over 55%, with an annual output of 4.6 million tons of vanadium-titanium magnetite concentrate and an annual profit of 47.426 million yuan.

[0101] Effects of process improvement:

[0102] The quality of incoming ore to mineral processing enterprises has been deteriorating year by year, with the proportion of easily ground and processed ore decreasing annually, concentrate particle size increasing year by year, and concentrate production time decreasing year by year. This makes it difficult to meet the current blast furnace demand for vanadium-titanium magnetite concentrate. This invention, considering the declining grade of incoming ore and the actual production situation of the two-stage grinding and beneficiation process for vanadium-titanium magnetite concentrate, addresses the challenges of upgrading the vanadium-titanium magnetite concentrate process, which is currently of low quality and unable to meet the current blast furnace demand. It proposes a three-stage grinding and beneficiation device and method to upgrade the vanadium-titanium magnetite concentrate process, achieving stable production and improved quality. From January to October 2024, the grade of incoming ore from the mine was 25.97%, a decrease of 0.92% compared to the planned 26.89%. The particle size of vanadium-titanium magnetite concentrate increased from 67.69% to 87.81%, an increase of 1.81% compared to the planned 86%. The grade of vanadium-titanium magnetite concentrate reached 55.42%, an increase of 0.42% compared to the planned 55%. The output of vanadium-titanium magnetite concentrate was 3.8454 million tons, with an annual production capacity of 4.6145 million tons, an increase of 14,500 tons compared to the planned 4.6 million tons. This achieved the desired effect of the three-stage grinding and beneficiation process upgrade, ensuring that the existing blast furnace's demand for vanadium-titanium magnetite concentrate was met, resulting in good economic and social benefits.

[0103] Benefits generated:

[0104] Based on the raw material and fuel prices over the past three years, the production costs of vanadium-titanium magnetite concentrate after upgrading and the overall pig iron production costs in the ironmaking process are calculated as follows: Increasing the grade of vanadium-titanium magnetite concentrate from 53.6% to 55% increases revenue by RMB 36.64 / ton, upgrading operating costs by RMB 33.59 / ton, and overall efficiency improvement by RMB 3.05 / ton. The overall pig iron production cost can decrease by RMB 7.26 / ton (of which: ore costs increase by RMB 5.8 / ton, fuel costs decrease by RMB 13 / ton, and slag reduction costs decrease by RMB 0.06 / ton). The vanadium-titanium magnetite concentrate upgrading project saves the company RMB 47.426 million annually.

[0105] Revenue generated from improved vanadium-titanium magnetite concentrate quality: Upgrading vanadium-titanium magnetite concentrate increased revenue by 36.64 yuan / ton;

[0106] Annual revenue from upgrading vanadium-titanium magnetite concentrate: 4.6 million yuan × 36.64 yuan = 168.544 million yuan;

[0107] Upgrading vanadium-titanium magnetite concentrate reduces pig iron costs: 4.6 million yuan × 7.26 yuan = 33.396 million yuan;

[0108] Upgrading vanadium-titanium magnetite concentrate increases operating costs by: 4.6 million yuan × 33.59 yuan = 154.514 million yuan;

[0109] Total benefits after project implementation: 168.544 million yuan + 33.396 million yuan - 154.514 million yuan = 47.426 million yuan.

[0110] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate, characterized in that, include: Mineral distribution box; the mineral distribution box is provided with a feed end and a discharge end; The upgrading raw ore pool is connected to the feed end; A hydrocyclone connected to the discharge end; the hydrocyclone is equipped with a tower mill; A magnetic separator with its feed inlet connected to the discharge outlet of the hydrocyclone; the magnetic separator is provided with a tailings outlet and a magnetic ore outlet; A filter connected to the magnetic separation outlet; the filter is provided with a concentrate outlet.

2. The three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate according to claim 1, characterized in that, The upgraded ore in the upgraded ore pool is vanadium-titanium magnetite concentrate produced by two-stage grinding and beneficiation.

3. The three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate according to claim 1, characterized in that, The upgraded raw ore pool is provided in multiple sets, and each set of upgraded raw ore pools is connected to the feed end through pipelines.

4. The three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate according to claim 1, characterized in that, The hydrocyclone is provided in 6 to 10 groups, and each group of hydrocyclones is connected to the discharge end.

5. The three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate according to claim 1, characterized in that, The tower mill and the hydrocyclone form a closed loop; the material after being ground by the tower mill is classified by the hydrocyclone and sent to the magnetic separator.

6. The three-stage grinding and beneficiation device for vanadium-titanium magnetite concentrate according to claim 1, characterized in that, The tailings outlet is connected to the tailings conveying system.

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