Blending ore blending method by weight accumulation

Abstract

The invention provides a blending ore blending method for stacking according to weight, which comprises the following steps of: in a stacking stage, paving and stacking according to a herringbone shape by using a blending stacker, distributing ores according to a weight ratio, reasonably arranging the variety number of the materials, paving multiple layers and ensuring that each layer is fully paved; in the material taking stage, a roller material taking machine is used for taking materials in the tangential direction, and it is guaranteed that the taking amount of each variety on the same section is equal; and through real-time monitoring and feedback control of a weight sensor and component monitoring equipment, component uniformity is ensured. According to the method, the quality stability of blended ore is effectively improved, the production adaptability is enhanced, the automation level is improved, and the blending and stacking efficiency is remarkably improved by optimizing variety selection.

Description

Technical Field

[0001] This invention belongs to the field of steel manufacturing technology and relates to a method for blending and mixing ore. Background Technology

[0002] In the steel industry, blending and mixing iron ore is a crucial step in ensuring the stability of sinter quality. To reduce costs, steel companies are increasingly adopting market-based methods for blending and mixing iron ore, dynamically and flexibly selecting the types of raw materials to purchase based on fluctuations in raw material market prices, thus significantly relaxing the raw material boundary conditions for blending. While this method effectively reduces direct procurement costs, it also directly leads to a substantial increase in the number of iron ore powder types involved in blending, often reaching dozens.

[0003] However, the core equipment of existing blending yard processes, the blending bins or batching bins used for stockpiling and reclaiming, are fixed and limited in number, typically only a dozen or so. This creates a sharp contradiction between "multiple varieties" and "small bin capacity": the number of raw material varieties that need to be blended far exceeds the physical capacity of the bins. Under these conditions, it is impossible to achieve simultaneous online batching of all varieties. The traditional method of "synchronous and precise batching according to a fixed formula" is physically difficult to implement, making the blending and stockpiling process extremely complex and difficult. On-site operations are often forced to adopt a compromise of "separate stockpiling and rotation," that is, grouping numerous mineral types and rotating them into the limited bins in different stockpiles or different stages of the same stockpile. This discontinuous and asynchronous batching mode breaks the uniformity and continuity of component control, leading to increased longitudinal and lateral component fluctuations within the stockpile, making it difficult to ensure component stability, thus impacting the stability of downstream sintering processes and ultimately affecting the uniformity of sinter quality. Summary of the Invention

[0004] To address the problems mentioned in the background art, such as the large variety of ore blending and the difficulty in ensuring compositional stability and affecting the uniformity of sinter quality in existing blending methods, this invention provides a blending method based on weight stacking. This method effectively improves the quality stability of blended ore, enhances production adaptability, improves automation level, and significantly improves blending and stacking efficiency by optimizing ore selection.

[0005] The method of the present invention includes: The number of different types of ore used for batching is M, the number of ore bins is N, and the number of different types of ore used in each batch is K. i Where i = 1, 2, ..., n, n is the number of times the material is piled up, and K i ≤N; According to the ore blending plan, M types of raw materials will be allocated according to their weight ratio; Stacking stage: Based on the number of ore types K1 in the first batching, select the ore for the first stacking and select the same number of ore bins K1. Each batching should only stack one type of ore in each ore bin. Use a mixing stacker to stack the ore in a herringbone pattern on the mixing strip according to the stacking flow corresponding to each type of ore. The more layers the better, and each layer should be fully covered. Based on the number of ore types K2 in the second batching, select the corresponding ore and stack it in the same way. Continue in this manner until the nth stacking is completed, resulting in a mixed ore stack of M types of ore. Material extraction stage: For the mixed ore pile of M types of batching ore, a roller reclaimer is used to vertically cut and extract material along the cross section of the mixed ore pile. Each extraction must include the batching ore from each layer of the mixed ore pile. During the extraction process, the weight of the extracted ore is monitored in real time by a weight sensor, and the composition of the ore is monitored in real time by a composition monitoring device.

[0006] Furthermore, the raw ore is taken from the primary stockyard by the reclaimer and conveyed into the ore bin by the belt conveyor. After being precisely batched by the quantitative feeding system, it is conveyed to the mixing and stacking machine by the belt conveyor.

[0007] Furthermore, in the herringbone flat-laying stockpile, the mixing stockpile machine moves back and forth, moving at a constant speed along the length of the stockpile, laying the material layer by layer in a thin-layer flat-laying manner. The thickness of a single layer of stockpile is determined according to the actual situation. The flat-laying stockpile is repeated until all materials are piled up, forming a continuous mixed mineral stockpile.

[0008] Furthermore, when there is only one type of ore in the nth stockpile, it is selected to be combined with one or two types from the previous stockpile. Thus, based on the weight of the nth stockpile, the weight of the ore in the previous stockpile is adjusted to meet the ore blending plan.

[0009] Furthermore, the stockpile size for each type of ore is set based on the allocated weight and stockpile time, calculated using the following formula: The stockpile flow of the batched ore = the weight of the batched ore / the stockpile time. The stockpiling time for each type of ore is the same.

[0010] Furthermore, the traveling speed and material flow of the mixing and stacking machine are dynamically adjusted according to the type and weight ratio of the ore to ensure that each layer is consistent and uniform.

[0011] Furthermore, by adjusting the stockpile flow rate, it is ensured that each type of ore is laid out and fully stockpiled within a specified time, and that each layer is completely covered; the total stockpile flow rate for each batch does not exceed the maximum stockpiling capacity of the mixing stockpile.

[0012] Furthermore, by adjusting the material handling speed and cutting angle of the roller reclaimer, the amount of material handled by the roller reclaimer each time can be kept the same.

[0013] Furthermore, the material handling speed of the roller reclaimer is matched with the requirements of subsequent processes, and the material handling speed is determined according to the actual situation.

[0014] Furthermore, a flat-laying and direct-extraction process is adopted, with one pile being extracted twice. The mixing and stacking machine stacks the material back and forth in the mixing strips. After the material is stacked, it is cut vertically along the cross section of the mixed ore pile to extract the material. One strip is used for stacking, and another strip is used for extraction, alternating between the two processes.

[0015] Compared with the prior art, the present invention has the following advantages: (1) Solving the contradiction of "multiple varieties - few troughs": Traditional ore blending relies on "synchronous and precise batching according to a fixed formula". When the number of varieties M of the ore to be blended far exceeds the number of troughs N, it is physically impossible to blend them at the same time. This invention adopts the strategy of "piling by weight and batching in turn" (the number of varieties K in each batch) i ≤N), breaking through the limitation of the number of ore bins, enabling dozens of raw materials to be batched in an orderly manner within a limited number of bins, thus solving the fundamental contradiction of mismatch between the types of ore to be batched and the capacity of the facilities from the perspective of process principle; (2) Ensure uniform and stable composition of the mixed material pile: The traditional "separate pile, rotation" method leads to discontinuous and asynchronous batching, which easily causes longitudinal / lateral component fluctuations within the pile; This invention requires "each layer to be fully covered and the number of layers to be as large as possible", and extracts material by vertical cutting of the cross section, so that each extraction includes all raw material layers. From the principle of bulk material stacking and extraction, this method can significantly reduce the spatial component segregation of the pile and ensure the continuity and uniformity of the mixed mineral composition; (3) Achieving dynamic adaptation and balance in the stockpiling process: Traditional methods do not adequately consider the dynamic correlation between stockpiling parameters (such as material flow and speed) and raw material type and weight ratio; This invention dynamically adjusts the stockpiler's travel speed and stockpiling material flow according to the ore type and weight ratio. This adjustment is based on the principle of "layer number and material flow balance", maximizing the number of layers while ensuring that each layer is fully covered, thus optimizing the uniformity of material distribution from the perspective of process control principle; (4) Improve the automation and real-time performance of process control: Traditional methods rely on human experience and lack real-time weight and composition feedback during the stacking and reclaiming process; In this invention, the weight sensor and composition monitoring equipment are used to monitor in real time during the reclaiming stage to form a closed-loop feedback control. Based on the control principle of "real-time monitoring-feedback adjustment", deviations can be corrected in time, improving the ore blending accuracy and the stability of the final product composition. (5) Enhance the operational flexibility of ore blending selection: The restriction of tank positions leads to rigid arrangement of raw material input lines and tanks, affecting the efficiency of pile building; The "weight-based stacking" method of this invention decouples the binding relationship between the variety and the fixed tank position, allowing flexible selection of the input variety and sequence according to the site conditions; From the perspective of production scheduling principle, this improves the mobility of the mixing feed line and the material input tank, thereby improving the overall efficiency of pile building operation. (6) Ensuring the stability of downstream sintering processes: Fluctuations in the composition of blended ore will directly impact the sintering process and affect the uniformity of sinter quality. This invention obtains blended ore with more stable composition through the strategy of "piling by weight and piling in batches". Based on the basic principle of sintering raw material preparation, it provides a raw material foundation with uniform quality for downstream sintering processes, which helps to improve the quality stability of the final sinter.

[0016] In the stockpiling stage, this invention uses a blending stockpile machine to lay the ore in a herringbone pattern, distributing it according to weight ratios, rationally arranging the number of ingredient varieties, and ensuring multiple layers are laid and each layer is fully covered. In the reclaiming stage, a roller reclaimer is used to tangentially reclaim material, ensuring that each variety is reclaimed in equal quantities at the same cross-section. Real-time monitoring and feedback control via weight sensors and composition monitoring equipment ensure uniform composition. This invention effectively improves the quality stability of blended ore, enhances production adaptability, improves automation levels, and significantly increases blending and stockpiling efficiency through optimized variety selection. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0018] A method for blending and mixing ores by weight-based packing, comprising the following steps: The number of different types of ore used for batching is M, the number of ore bins is N, and the number of different types of ore used in each batch is K. i Where i = 1, 2, ..., n, n is the number of times the material is piled up, and K i ≤N; In general, N<M, that is, the number of types of raw materials M far exceeds the number of ore bins N; According to the ore blending plan, M types of raw materials will be allocated according to their weight ratio; Stacking stage: Based on the number of ore types K1 in the first batching, select the ore for the first stacking and select the same number of ore bins K1. Each batching should only stack one type of ore in each ore bin. Use a mixing stacker to stack the ore in a herringbone pattern on the mixing strip according to the stacking flow corresponding to each type of ore. The more layers the better, and each layer should be fully covered. Based on the number of ore types K2 in the second batching, select ore different from the first stacking and stack it in the same way. Continue in this manner until the nth stacking is completed, resulting in a mixed ore stack of M types of ore.

[0019] Specifically, the raw ore is taken from the primary stockyard by a reclaimer and transported into the ore bin by a belt conveyor. After being precisely batched by a quantitative feeding system, it is transported to the mixing and stacking machine by a belt conveyor.

[0020] Specifically, in the herringbone flat-laying stockpile, the mixing stockpile machine moves back and forth, moving at a constant speed along the length of the stockpile, and lays the material layer by layer in a thin-layer flat-laying manner. The thickness of a single layer of material is determined according to the actual situation, usually 5-50mm. The flat-laying and stockpiling is repeated until all materials are piled up, forming a continuous mixed mineral stockpile.

[0021] In practical application, the types of raw materials for the second stockpile can be completely different from those for the first stockpile, or they can be partially the same. In other words, the types of raw materials for each stockpile can be adjusted according to actual needs.

[0022] In one embodiment, when the nth stockpile contains only one type of ore, it is selected to be combined with one or two types from the previous stockpile. This allows the weight of the previous stockpile to be adjusted based on the weight of the nth stockpile to meet the ore blending plan. The nth stockpile, i.e., the final stockpile, can also use only a single type of ore. However, the more types of ore are used in each stockpile, and the more layers each type participates in, the more stable the quality of the blended powder becomes. To further stabilize the quality of the blended powder, multiple types are generally used together in the stockpile.

[0023] Specifically, the stockpile size for each type of ore is set based on the allocated weight and stockpile time, calculated using the following formula: The stockpile flow of the batched ore = the weight of the batched ore / the stockpile time. The stockpiling time for each type of ore is the same.

[0024] In practical applications, the traveling speed and material flow of the blending stacker are dynamically adjusted according to the type and weight ratio of the ore. By adjusting the material flow, it is ensured that each type of ore is laid out and stacked within a specified time, and that each layer is fully covered; the total material flow of each batch does not exceed the maximum stacking capacity of the blending stacker.

[0025] Material extraction stage: For the mixed ore pile of M types of batching ore, a roller reclaimer is used to vertically cut and extract material along the cross section of the mixed ore pile. Each extraction must include the batching ore from each layer of the mixed ore pile. During the extraction process, the weight of the extracted ore is monitored in real time by a weight sensor, and the composition of the ore is monitored in real time by a composition monitoring device.

[0026] Specifically, by adjusting the material handling speed and cutting angle of the roller reclaimer, the amount of material handled by the roller reclaimer each time is kept the same.

[0027] Specifically, the material handling speed of the roller reclaimer is matched with the requirements of subsequent processes. The material handling speed is determined according to the actual situation, and is usually 1000-3000t / h.

[0028] In practical application, this application adopts a flat-laying and direct-extraction process, with one pile being extracted twice. The mixing and stacking machine stacks the material back and forth in the mixing strip. After the material is stacked, it cuts vertically along the cross section of the mixed mineral pile to extract the material. One strip is used for stacking, and another strip is used for extraction, alternating between the two.

[0029] The key to ensuring stable mixing quality in this application lies in the following three points: (1) Precise batching: The batching ore is taken from the primary stockyard by the reclaimer and conveyed into the ore bin by the belt conveyor. After being precisely batched by the quantitative feeding system, it enters the mixing and stacking machine by the belt conveyor. (2) Layered flat laying: In the herringbone flat laying, the mixing and stacking machine moves back and forth, moving at a constant speed along the length of the stockpile, laying the material layer by layer in a thin layer flat laying manner (the thickness of a single layer of material is usually 5-50mm), repeating the flat laying and stacking until all materials are piled up to form a continuous mixed mineral pile; the key here is that each type of material must be evenly laid in each layer and fully covered; (3) Full-section vertical material taking: The drum reclaimer cuts vertically along the cross section of the mixed ore pile and takes material. Each material taking must include the batching ore of each layer of the mixed ore pile. The material is further mixed by the rotation and stirring action of the drum. The material taking speed is matched with the requirements of the subsequent process (the material taking speed is usually 1000-3000t / h). The mixed ore taken is sent to sintering for use.

[0030] The innovation of this application lies in: (1) Stacking by weight: By stacking by weight, it is ensured that each type of ore is evenly distributed during the stacking process and that each layer is fully covered, thereby improving the stability of the mixed ore composition; (2) Dynamic adjustment of parameters: The walking speed and material flow of the mixing and stacking machine are dynamically adjusted according to the type and weight ratio of the ore to achieve the best stacking effect; (3) Real-time monitoring and feedback control: During the stockpiling and reclaiming process, the weight and composition of the ore are monitored in real time by weight sensors and composition monitoring equipment, and feedback control is carried out based on the monitoring results to further optimize the mixing effect; (4) Balance between number of layers and material flow: By reasonably arranging the actual number of raw material varieties K (K < N), different material flows are selected for each variety, allowing for flexibility. Ensure that each type of ore is laid in as many layers as possible during the stockpiling process, the more layers the better, while ensuring that each layer is fully laid, avoiding situations where only half or part of the material is laid; (5) Flexibility in variety selection: The weight batching method makes it more convenient and flexible to select the variety of iron powder ore for the mixing feed line and the iron powder ore feed tank, which is conducive to improving the mixing and stacking efficiency.

[0031] Example 1 The blending and mixing requirements of a steel plant are as follows: Number of ore varieties in the blend M: 10 ore varieties; Number of mining slots N: 5 mining slots; Actual number of ingredient varieties K: 3 types of ore are selected for each batch, K = 3, and K < N; Stacking equipment: Mixing stacker, maximum stacking capacity 2500 t / h; Material handling equipment: roller reclaimer, maximum material handling capacity 2000 t / h; Material yard conditions: B1 mixing material yard, with a storage capacity of approximately 220,000 tons.

[0032] I. The specific details of the stockpiling stage are as follows: Step 1: According to the ore blending plan, allocate the 10 types of ore according to their weight ratio. Assuming the total stockpile is 220,000 tons, the weight allocation for each type of ore is as follows: Grade A ore: 33,000 tons; Grade B ore: 44,000 tons; Grade C ore: 33,000 tons; Grade D ore: 22,000 tons; Grade E ore: 22,000 tons; Grade F ore: 22,000 tons; Grade G ore: 11,000 tons; Grade H ore: 11,000 tons; Grade I ore: 11,000 tons; Grade J ore: 11,000 tons; Step 2: Rationally arrange the actual number of ingredients K: Each time ingredients are mixed, three types of ore are selected from ten types. To ensure weight balance, the heavier and lighter types of ore are mixed together each time. This example is as follows: First batch of ingredients: Select variety B (larger weight), variety D (medium weight), and variety G (smaller weight). Second batch of ingredients: Select variety A (larger weight), variety E (medium weight), and variety H (smaller weight); Third batch of ingredients: Select C variety (larger weight), F variety (medium weight), and I variety (smaller weight); Fourth batch of ingredients: Select variety J (remaining varieties).

[0033] To reduce the occurrence of single-variety material being piled up alone, variety J can be combined with one or two varieties from the previous batch to form a new combination. In this embodiment, variety J is combined with variety I.

[0034] Only one type of ore is stored in each bin: during the first batching, type B ore is placed in bin 1, type D ore in bin 2, and type G ore in bin 3; during the second batching, type A ore is placed in bin 1, type E ore in bin 2, and type H ore in bin 3; and so on.

[0035] Step 3: Lay the material in multiple layers, ensuring each layer is fully covered. For each type of ore, spread it as much as possible, the more layers the better, while ensuring that each layer is fully covered. This is an important prerequisite for ensuring the stability of the composition.

[0036] The flow rate of each type of ore is adjusted according to its allocated weight and stockpiling time, as shown in this embodiment: The material flow rate for ore type B is 667 t / h; The material flow rate for ores of grades A and C is 500 t / h; The material flow rate for ores of grades D, E, and F is 333 t / h; The material flow rate for grades G, H, I, and J ores is 167 t / h.

[0037] By adjusting the material flow rate, it is ensured that each type of ore is stacked within a specified time and that each layer is fully covered; the total material flow rate for each batch should be as close as possible to but not exceed the maximum stacking capacity of the stacker, 2500 t / h. This example is as follows: Total material flow for the first batching: 667 (B variety) + 333 (D variety) + 167 (G variety) = 1167 t / h; Total material flow for the second batching: 500 (Type A) + 333 (Type E) + 167 (Type H) = 1000 t / h; Total material flow for the third batching: 500 (C variety) + 333 (F variety) + 167 (I variety) = 1000 t / h; Total material flow for the fourth batching: 167 (J variety) + 167 (I variety) = 334 t / h (J variety and I variety are combined).

[0038] Step 4: Dynamically adjust the stockpiling parameters: The traveling speed and material flow of the mixing and stacking machine are dynamically adjusted according to the type and weight ratio of the ore.

[0039] In this implementation, for the heavier B-grade ore, the stockpile flow rate is appropriately reduced and the walking speed is increased to ensure uniform distribution; for the lighter G, H, I, and J-grade ores, the stockpile flow rate is appropriately increased and the walking speed is slowed down to ensure full coverage.

[0040] II. The specific details of the material collection stage are as follows: Step 1: Take materials by weight: A drum reclaimer is used for tangential material collection, employing a flat-laying, straight-collecting process to ensure uniform ore composition during the collection process.

[0041] During the material handling process, the weight of the ore is monitored in real time by a weight sensor to ensure the accuracy of material handling by weight.

[0042] In this embodiment, the amount of material taken each time is 1000 tons.

[0043] By adjusting the material handling speed and cutting angle, we ensure that the weight of each material handled meets the requirements.

[0044] Step 2: Real-time monitoring and feedback control: By monitoring the composition of the ore in real time using composition monitoring equipment, the composition of the mixed powder can be determined in advance based on the monitoring results, which facilitates the adjustment of the basicity of the sintered ore in the sintering process according to the composition.

[0045] The preferred embodiments of the present invention have been described in detail above with reference to specific examples. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

Claims

1. A method for blending and mixing ore by weight-based packing, characterized in that, include: The number of different types of ore used for batching is M, the number of ore bins is N, and the number of different types of ore used in each batch is K. i Where i = 1, 2, ..., n, n is the number of times the material is piled up, and K i ≤N; According to the ore blending plan, M types of raw materials will be allocated according to their weight ratio; Stacking stage: Based on the number of ore types K1 in the first batching, select the batching ore for the first stacking and select the same number of ore bins K1. Each batching should only stack one type of ore in each ore bin. Use a mixing stacker to stack the material in a herringbone pattern on the mixing strip according to the stacking flow corresponding to each batching ore. The more layers the better, and each layer should be fully covered. Based on the number of ore varieties K2 in the second batching, select the corresponding ore and perform the second batching in the same way. Continue in this manner until the nth batching is completed, and obtain a mixed ore pile of M kinds of ore. Material extraction stage: For the mixed ore pile of M types of batching ore, a roller reclaimer is used to vertically cut and extract material along the cross section of the mixed ore pile. Each extraction must include the batching ore from each layer of the mixed ore pile. During the extraction process, the weight of the extracted ore is monitored in real time by a weight sensor, and the composition of the ore is monitored in real time by a composition monitoring device.

2. The method for blending and mixing ore by weight packing according to claim 1, characterized in that: The raw ore is taken from the primary stockyard by the reclaimer and conveyed into the ore bin by the belt conveyor. After being precisely batched by the quantitative feeding system, it is conveyed to the mixing and stacking machine by the belt conveyor.

3. A method for blending and mixing ore by weight packing according to claim 1 or 2, characterized in that: In the herringbone flat-laying stockpile, the mixing stockpile machine moves back and forth, moving at a constant speed along the length of the stockpile, laying the material layer by layer in a thin-layer flat-laying manner. The thickness of a single layer of material is determined according to the actual situation. The flat-laying and stockpiling is repeated until all materials are piled up, forming a continuous mixed mineral stockpile.

4. The method for blending and mixing ore by weight packing according to claim 1, characterized in that: When there is only one type of ore in the nth stockpile, it is selected to be combined with one or two types from the previous stockpile. Based on the weight of the nth stockpile, the weight of the ore in the previous stockpile is adjusted to meet the ore blending plan.

5. A method for blending and mixing ore by weight packing according to claim 1 or 4, characterized in that: The stockpile size for each type of ore is set based on the allocated weight and stockpile time, calculated using the following formula: The stockpile flow of the batched ore = the weight of the batched ore / the stockpile time. The stockpiling time for each type of ore is the same.

6. The method for blending and mixing ore by weight packing according to claim 5, characterized in that: The traveling speed and material flow of the mixing and stacking machine are dynamically adjusted according to the type and weight ratio of the ore.

7. The method for blending and mixing ore by weight packing according to claim 6, characterized in that: By adjusting the stockpile flow rate, it is ensured that each type of ore is laid out and fully stockpiled within a specified time, and that each layer is completely covered; the total stockpile flow rate for each batch does not exceed the maximum stockpiling capacity of the mixing stockpile.

8. The method for blending and mixing ore by weight packing according to claim 1, characterized in that: By adjusting the material handling speed and cutting angle of the roller reclaimer, the amount of material handled by the roller reclaimer each time can be kept the same.

9. The method for blending and mixing ore by weight packing according to claim 8, characterized in that: The material handling speed of the roller reclaimer is matched with the requirements of subsequent processes, and the material handling speed is determined according to the actual situation.

10. The method for blending and mixing ore by weight packing according to claim 1, characterized in that: The process of flat-laying and direct extraction is adopted, with one pile and two extractions. The mixing and stacking machine stacks the material back and forth in the mixing strip. After the material is stacked, it cuts vertically along the cross section of the mixed mineral pile to extract the material. One strip is used for stacking and another strip is used for extraction, alternating between the two.