A low-grade manganese carbonate ore enrichment device
Patent Information
- Application Number
- CN202522091449.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-09-28
AI Technical Summary
[0003]本实用新型提供了一种低品位碳酸锰矿的富集装置，用以解决现有碳酸锰矿选矿方法品位和回收率均不高、成本高的技术问题
本实用新型能够有效解决低品位碳酸锰矿处理难题，实现了回收率突破性提升和精矿品位显著优化及资源与成本双节约，还形成智能化控制保障破碎稳定性机制，通过粒度监测→齿辊间隙/转速闭环调节→气流分选联动，形成抗干扰的稳态生产系统。与现有技术相比，最终锰精矿品位提升了5个百分点以上，回收率提高了10个百分点以上。这不仅提高了资源利用率，还增加了经济效益，减少了对环境的影响，为低品位碳酸锰矿的开发利用提供了更高效的方法。
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Figure CN224656862U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mineral processing technology, and in particular to an enrichment device for low-grade manganese carbonate ore. Background Technology
[0002] Current beneficiation technologies for low-grade manganese carbonate ore typically employ traditional crushing equipment (such as jaw crushers and hammer crushers) for coarse crushing, followed by wet magnetic separation for purification. However, traditional crushing methods tend to produce excessive fine-grained ore (over 30% of particles are -3mm in size), making it difficult to effectively recover these fine particles during subsequent separation, resulting in manganese metal loss and recovery rates generally below 85%. Simultaneously, wet magnetic separation consumes significant amounts of water and incurs high tailings treatment costs, leading to resource waste and low economic efficiency. Therefore, there is an urgent need to develop a new beneficiation method that can simultaneously improve the grade and recovery rate of low-grade manganese carbonate ore. Utility Model Content
[0003] This invention provides an enrichment device for low-grade manganese carbonate ore, which solves the technical problems of low grade and recovery rate and high cost in existing manganese carbonate ore beneficiation methods.
[0004] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows: To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows: An enrichment device for low-grade manganese carbonate ore includes a crushing unit, a magnetic separation unit, and a scavenging unit arranged in sequence. The crushing unit includes a coarse crushing chamber and a fine crushing chamber that are connected to each other. Both the coarse crushing chamber and the fine crushing chamber are equipped with a plurality of toothed roller groups. Each toothed roller group includes a front roller and a rear roller arranged in sequence along the horizontal direction. The gap between the front roller and the rear roller in the coarse crushing chamber is larger than the gap between the front roller and the rear roller in the fine crushing chamber.
[0005] This invention provides a staged crushing mechanism formed by setting up continuously connected coarse crushing chambers and fine crushing chambers. The coarse crushing chamber can increase the throughput (by 30%), while the fine crushing chamber is used to precisely control the final particle size. At the same time, by setting up a roller group structure composed of double-toothed rollers in the coarse and fine crushing chambers, the material throughput time can be shortened and the gap difference between the front and rear rollers can be limited. The large tooth pitch in the coarse crushing stage enables efficient crushing, while the small tooth pitch in the fine crushing stage precisely controls the particle size, reduces the risk of over-crushing, and significantly reduces the loss of fine-grained ore, thereby ensuring the recovery effect in the subsequent magnetic separation and scavenging processes and avoiding a decrease in the recovery rate.
[0006] As a further preferred embodiment of the above technical solution, the gap between the front roller and the rear roller in the coarse crushing chamber is 8~10mm, and the gap between the front roller and the rear roller in the fine crushing chamber is 6mm.
[0007] As a further preferred embodiment of the above technical solution, in the coarse crushing chamber, the tooth pitch between the crushing teeth on the front roller is greater than the tooth pitch between the crushing teeth on each crushing roller in the rear roller. By employing asymmetrical toothed rollers, the front roller coarsely crushes the rear roller, which precisely controls the minimum particle size, improving the product particle size distribution and reducing over-crushing.
[0008] As a further preferred embodiment of the above technical solution, the crushing teeth on the front and / or rear rollers in the fine crushing chamber have a spirally tapering shape. The crushing teeth are arranged spirally from one end of the front and / or rear rollers to the other end, and the tooth height gradually decreases. The spiral arrangement guides the material flow, so that the material is subjected to shear force as the main force and extrusion force as the secondary force between the rollers, reducing the fine powder rate caused by impact crushing. The tooth height gradually decreases from the end of the roller away from the outlet to the end closer to the outlet, realizing progressive crushing and reducing the particle size step by step. This avoids excessive unqualified particle size due to an excessively large crushing ratio and avoids fine powder caused by abrupt changes in the crushing ratio.
[0009] As a further preferred embodiment of the above technical solution, a particle size monitoring device is provided at the outlet of the fine crushing chamber. The gap and rotational speed of the toothed rollers in the fine crushing chamber are adjusted based on the output of the particle size monitoring device, thereby maintaining particle size stability.
[0010] As a further preferred embodiment of the above technical solution, a collection bin is provided at the outlet of the crushing unit, and an airflow purging device is provided at the outlet of the fine crushing chamber to blow fine powder that has reached the crushing standard into the collection bin. The airflow purging device can separate the qualified fine powder in real time, avoiding over-crushing caused by repeated crushing. The airflow separation and crushing are carried out simultaneously, which can reduce the residence time of fine powder and reduce the probability of over-crushing. The airflow velocity output by the airflow purging device is 5~8m / s. The airflow rate is adjustable to adapt to materials with different properties.
[0011] As a further preferred embodiment of the above technical solution, the magnetic separation unit is a permanent magnet drum-type dry magnetic separator, and the magnetic separation unit is equipped with a high-medium-low gradient magnetic pole array. The strong magnetic field rapidly captures weakly magnetic manganese minerals, the medium magnetic field achieves stable adsorption, and the weak magnetic field achieves the orderly release of gangue inclusions.
[0012] This utility model has the following beneficial effects: This invention effectively solves the problem of processing low-grade manganese carbonate ore, achieving a breakthrough in recovery rate, significant optimization of concentrate grade, and dual savings in resources and costs. It also establishes an intelligent control mechanism to ensure crushing stability, forming a stable, interference-resistant production system through particle size monitoring, closed-loop adjustment of toothed roller gap / speed, and airflow separation. Compared with existing technologies, the final manganese concentrate grade is increased by more than 5 percentage points, and the recovery rate is increased by more than 10 percentage points. This not only improves resource utilization but also increases economic benefits, reduces environmental impact, and provides a more efficient method for the development and utilization of low-grade manganese carbonate ore. Attached Figure Description
[0013] Figure 1 This is a schematic flowchart of the enrichment method for low-grade manganese carbonate ore according to the present invention.
[0014] Figure 2 This is a schematic diagram of the crushing unit in Example 1.
[0015] Figure 3 This is a schematic diagram of the crushing chamber in Example 1.
[0016] Figure 4 This is a test diagram of the front and rear rollers in the fine crushing chamber of Example 1.
[0017] Legend: 1. Coarse crushing chamber; 2. Fine crushing chamber; 21. Outlet; 22. Airflow purging device; 3. Front roller; 4. Rear roller. Detailed Implementation
[0018] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. However, the present invention can be implemented in many different ways as defined and covered by the claims.
[0019] Example 1: The enrichment device for low-grade manganese carbonate ore in this embodiment includes a crushing unit, a magnetic separation unit, and a scavenging unit arranged sequentially, with each unit connected by conventional conveyor belts, mine cars, etc. Figure 2 As shown, the crushing unit includes a coarse crushing chamber 1 and a fine crushing chamber 2 that are connected to each other. Both the coarse crushing chamber 1 and the fine crushing chamber 2 are equipped with a set of toothed rollers. The toothed roller set includes a front roller and a rear roller arranged sequentially in the horizontal direction. The gap between the front and rear rollers in the coarse crushing chamber 1 is larger than the gap between the front and rear rollers in the fine crushing chamber 2. The gap between the front and rear rollers in the coarse crushing chamber 1 is 8mm~10mm (selected according to the type of ore and actual production requirements; 9mm is selected in this embodiment), and the gap between the front and rear rollers in the fine crushing chamber 2 is 6mm. The large tooth pitch in the coarse crushing stage ensures efficient crushing, while the small tooth pitch in the fine crushing stage precisely controls the particle size, reducing the risk of over-crushing. In the coarse crushing chamber 1, the tooth pitch between the crushing teeth on the front roller is larger than the tooth pitch between the crushing teeth on each crushing roller in the rear roller. Figure 3 and Figure 4 As shown, the teeth of the crushing teeth on the front and rear rollers in the fine crushing chamber 2 are spirally tapered, that is, the crushing teeth are arranged in a spiral shape along the direction from the end of the roller away from the outlet 21 to the end near the outlet 21 (the outlet 21 of the fine crushing chamber 2 is generally set at one end of the side of the chamber), and the tooth height gradually decreases.
[0020] In this embodiment, a particle size monitoring device is installed at the outlet 21 of the fine crushing chamber 2. The gap and rotational speed of the toothed rollers in the fine crushing chamber 2 are adjusted according to the output of the particle size monitoring device to maintain particle size stability.
[0021] In this embodiment, a collection bin is provided at the outlet 21 of the crushing unit, and an airflow purging device 22 (gas nozzle) is provided at the outlet 21 of the fine crushing chamber 2 to blow fine powder that has reached the crushing standard into the collection bin. The airflow purging device 22 can separate the qualified fine powder in real time, avoiding over-crushing caused by repeated crushing. The airflow separation and crushing are carried out simultaneously, which can reduce the residence time of fine powder and reduce the probability of over-crushing. The airflow velocity output by the airflow purging device 22 is 5~8m / s. The airflow rate is adjustable to adapt to materials with different properties.
[0022] In this embodiment, the magnetic separation unit is a permanent magnet drum-type dry magnetic separator, and a high-medium-low gradient magnetic pole array is set inside the magnetic separation unit. The strong magnetic field quickly captures weakly magnetic manganese minerals, the medium magnetic field achieves stable adsorption, and the weak magnetic field achieves the orderly release of gangue inclusions.
[0023] like Figure 1 As shown, the enrichment method for low-grade manganese carbonate ore using the enrichment device of this embodiment is illustrated in Tables 1, 2, and 3, respectively. The composition, content, and important mineral composition of the processed manganese ore are included, along with the following operations: (1) The low-grade manganese carbonate ore is crushed using a toothed roller crusher to obtain the crushed ore; wherein, the toothed roller crusher includes a coarse crushing chamber and a fine crushing chamber connected together, and the low-grade manganese carbonate ore is coarsely crushed and finely crushed in sequence; a pair of toothed rollers arranged in front and behind are installed in both the coarse crushing chamber and the fine crushing chamber; the toothed rollers in the coarse crushing chamber are asymmetrical toothed rollers, and the tooth pitch of the front roller is greater than that of the rear roller. The tooth shape of the rear roller in the coarse crushing chamber is spirally tapered, that is, the tooth height of the rear roller is arranged in a spiral shape from the inlet to the outlet, and the tooth height gradually decreases; the gap between the front rollers in the coarse crushing chamber is 9mm; the gap between the rear rollers is 6mm; the coarse crushing initially crushes the low-grade manganese carbonate ore to 10-15mm, and the large tooth pitch reduces the generation of fine powder. The fine crushing makes the material subject to shear force as the main force and extrusion force as the auxiliary force between the rollers, thereby reducing the fine powder rate caused by impact crushing. The outlet of the fine crushing chamber is equipped with an airflow purging device (high-pressure airflow nozzle array) to blow the fine powder that has reached the crushing standard into the collection bin. By adjusting the airflow speed (7 m / s in this embodiment), the fine powder (-6 mm) that has reached the standard is blown out of the crushing chamber in real time and directly enters the independent collection bin, avoiding repeated crushing. The outlet of the fine crushing chamber is also equipped with a particle size monitoring device (online laser particle size analyzer) to detect the content of mineral particles with a particle size of -3 mm in real time. When the proportion of -3 mm is close to 20%, the rear roller gap is automatically increased (e.g., adjusted from 6 mm to 7 mm) and the roller speed is reduced (e.g., reduced by 10%~15%) to reduce the crushing intensity. When the particle size is too coarse, the gap is reduced and the rotation speed is increased to ensure the target particle size upper limit (6 mm). The above operations can be used to establish a dynamic control model to achieve automatic control.
[0024] (2) A GT series permanent magnet drum dry magnetic separator was selected, and a dry magnetic separation process of coarse and scavenging was adopted to separate the ore: first, the ore was subjected to magnetic coarse separation to obtain coarse concentrate and tailings, and then the tailings were scavenged. The middlings obtained from the scavenging were returned to the magnetic coarse separation as raw materials for further processing, thus completing the enrichment of low-grade manganese carbonate ore. The coarse magnetic separation adopted a three-gradient magnetic pole array (strong-medium-weak gradient distribution): a 1.2T strong magnetic field in the feed zone, a 0.8T medium magnetic field in the middle section, and a 0.6T weak magnetic field in the discharge zone. The scavenging adopted a 1.2T strong magnetic field, which utilized the hysteresis effect to separate fine intergrowths, effectively improving the grade and recovery rate of manganese concentrate. The implementation effect of this embodiment is compared with that of conventional technology in Table 4.
[0025] Table 1. Chemical multi-element analysis results of the ore / %
[0026] Table 2 Chemical phase analysis results of manganese in ore / %
[0027] Table 3. Content of major minerals in the ore (%)
[0028] Table 4 Comparison of sorting results for different implementation schemes / %
[0029] The above description is merely a preferred embodiment of this utility model, and the protection scope of this utility model is not limited to the above embodiments. For those skilled in the art, improvements and modifications obtained without departing from the technical concept of this utility model should also be considered within the protection scope of this utility model.
[0030] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A device for enriching low-grade manganese carbonate ore, characterized in that, It includes a crushing unit, a magnetic separation unit and a sweeping unit arranged in sequence; the crushing unit includes a coarse crushing chamber (1) and a fine crushing chamber (2) connected to each other. Both the coarse crushing chamber (1) and the fine crushing chamber (2) are provided with a number of toothed roller groups. The toothed roller group includes a front roller (3) and a rear roller (4) arranged in sequence along the horizontal direction. The gap between the front roller (3) and the rear roller (4) in the coarse crushing chamber is greater than the gap between the front roller (3) and the rear roller (4) in the fine crushing chamber.
2. The enrichment device for low-grade manganese carbonate ore according to claim 1, characterized in that, The gap between the front roller (3) and the rear roller (4) in the coarse crushing chamber (1) is 8~10mm, and the gap between the front roller (3) and the rear roller (4) in the fine crushing chamber (2) is 6mm.
3. The enrichment device for low-grade manganese carbonate ore according to claim 1, characterized in that, In the coarse crushing chamber (1), the tooth pitch between the crushing teeth on the front roller (3) is greater than the tooth pitch between the crushing teeth on each crushing roller in the rear roller (4).
4. The enrichment device for low-grade manganese carbonate ore according to any one of claims 1-3, characterized in that, The crushing teeth on the front roller (3) and / or rear roller (4) in the fine crushing chamber (2) are spirally tapered. The crushing teeth are arranged in a spiral shape from one end of the front roller (3) and / or rear roller (4) to the other end, and the tooth height gradually decreases.
5. The enrichment device for low-grade manganese carbonate ore according to any one of claims 1-3, characterized in that, A particle size monitoring device is installed at the outlet (21) of the fine crushing chamber (2).
6. The enrichment device for low-grade manganese carbonate ore according to any one of claims 1-3, characterized in that, A collection bin is provided at the outlet (21) of the crushing unit, and an airflow purging device (22) is provided in the fine crushing chamber (2) for blowing fine powder that has reached the crushing standard into the collection bin.
7. The enrichment device for low-grade manganese carbonate ore according to any one of claims 1-3, characterized in that, The magnetic separation unit is a permanent magnet drum dry magnetic separator, and the magnetic separation unit is equipped with a high-medium-low three-gradient magnetic pole array.