Optimization of roller teeth based on the analysis of the crushing mechanism of sintered ore

The smelting process of high‐manganese pig iron is studied to determine ways to efficiently utilize the by‐product of manganese‐rich slag. This process consists of two stages: 1) demanganese and carbon retention and 2) decarbonization and dephosphorization. In the first stage, oxygen is supplied at 0.5–2.0 Nm3 t−1 min−1. The temperature is controlled between 1300 and 1400 °C by adding iron ore to the molten bath. Ultimately, high‐manganese slag, which contains more than 50% manganese oxide and semisteel with 3.2% carbon, is produced. In the second stage, oxygen is supplied at 2.0−5.0 Nm3 t−1 min−1 and slag‐forming materials are added to the molten bath for the dephosphorization and desulfurization of the hot metal. Consequently, the iron oxide, manganese oxide, and silicon oxide contents of the high‐manganese slag and the carbon, manganese, phosphorus, and sulfur contents of the semisteel are 10.8–15.3%, 70–77%, and 3–7%, and 3.2–4.2%, 0.3–1.0%, 0.12–0.22%, and 0.01–0.024%, respectively. The main mineral phases of high‐manganese slag, 2MnO·SiO2 and FeO·MnO·SiO2, are suitable for the preparation of high‐carbon ferromanganese raw materials. After further smelting, clean molten steel containing 0.03−0.08%, 0.08−0.20%, 0.005−0.02%, and 0.01−0.024% carbon, manganese, phosphorus, and sulfur, respectively, is obtained.

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“…The activity coefficients of MnO, Mn, C, and Si were retrieved from the literature. [ 23–25 ]

log L^{'} _{\text{Mn}} = - 11.42 + \frac{2511}{T} + \frac{1500.63}{T} - log \left[\right. \% C \left]\right.

…”

Section: Resultsmentioning

confidence: 99%

Study on Efficient Use of High‐Manganese Pig Iron

Zhao

Yang

et al. 2023

steel research int.

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“…Mixing of dolomite, quicklime, coke powder, sinter return fine, iron ore, and water, according to a certain ratio (as shown in Table 1), and using a lightweight hammering method to make sintered ore samples for uniaxial compression tests and Brazilian splitting tests. 29 After sample moulding, place it in a high-temperature well-type electric furnace for calcination, with the temperature set within the range of 1250 °C to 1360 °C. The standard cylindrical samples have dimensions of Φ 50 mm × 100 mm, while the Brazilian splitting samples have dimensions of Φ 50 mm × 25 mm.…”

Section: Methodsmentioning

confidence: 99%

Crushing mechanism analysis of sintered ore and study of particle size distribution pattern after crushing

Tang,

Dai,

Zhou

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

Self Cite

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To improve the crushing effect and reduce the range of particle size distribution after crushing, the crushing mechanism and the particle size distribution pattern after crushing of sintered ore under different roller rotation speeds are analysed in this paper. Based on the discrete element method, the microscopic parameters of sintered ore are calibrated and validated by uniaxial compression and the Brazilian splitting test. The initiation, propagation, and penetration of cracks inside the sintered ore are described by innovatively introducing the concept of compaction core and combining the force chain evolution. It reveals that the extension and penetration of radial cracks generated under the action of the tooth tip, along with the continuous formation and crushing of compacted cores, are the essence of crushing. The generation of new cracks originates from the tensile failure between particles in the region where tensile force chains are concentrated. Increasing the rotation speed properly can improve the crushing effect of sintered ore but also excessive rotation speed (4, 5, and 6 rad s−1) will hinder the main crack propagation path of sintered ore and deteriorate the crack penetration effect, which may inhibit the crushing effect of sintered ore in turn. The research results may have important implications for understanding the crushing mechanism of the sintered ore and optimising the crushing process.

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Experimental Study on the Dynamic Impact Characteristics of Iron Ore Under Free-Fall Conditions

Wang,

Song,

et al. 2024

Minerals

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Ore processing equipment is constantly subjected to impacts from various types of ore. However, the impact force characteristics generated by ore particles of different masses have not been thoroughly studied, which has hindered the design and monitoring of such equipment. This paper presents an experimental study on the dynamic impact characteristics of iron ore particles under free–fall conditions. The research focuses on understanding the mechanical behavior of ore particles of varying sizes and weights when colliding with metallic components, particularly crushers, which are critical in the ore processing industry. A modified Split Hopkinson Pressure Bar apparatus was utilized to measure the impact forces, durations, and deformation patterns during collisions. Two types of fired iron ore pellets were collected from industrial plants and sorted into different mass ranges for testing. The pellets were dropped from a height of 1 m to impact a steel rod, and the resulting impact forces were recorded using strain gauges. Additionally, finite element simulations were conducted to validate the experimental methodology. The results revealed significant variations in impact force, duration, and deformation patterns, influenced by particle mass and impact position. The maximum recorded impact force was approximately 7500 N, indicating the high energy involved in these collisions. Impact durations ranged from 0.05 to 0.11 milliseconds, emphasizing the rapid nature of the interactions. The deformation patterns were consistent across all particles, supporting the applicability of Hertz’s contact theory.This study offers valuable insights into the dynamic impact characteristics of iron ore particles, which are essential for optimizing the design and performance of mining machinery.

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Optimization of roller teeth based on the analysis of the crushing mechanism of sintered ore

Cited by 3 publications

References 7 publications

Study on Efficient Use of High‐Manganese Pig Iron

Study on Efficient Use of High‐Manganese Pig Iron

Crushing mechanism analysis of sintered ore and study of particle size distribution pattern after crushing

Experimental Study on the Dynamic Impact Characteristics of Iron Ore Under Free-Fall Conditions

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