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Strength is the key index of pellet qualityPellet quality. Grate-rotary kilnRotary kilns is a typical process of pelletPellet production, which has large production capacity and stable product quality. The preheatingPreheating and roastingRoasting system of Bayan Obo ore pelletsPellet was optimized, the effect of strength and pulverization rate was clarified, and the phase transformationPhase transformation mechanism of metal iron oxide during preheatingPreheating and roastingRoasting was revealed. The results show that under the conditions of blast dryingDrying temperatureTemperature 220 ℃, exhaust dryingDrying temperatureTemperature 330 ℃, preheatingPreheating section I temperatureTemperature 750 ℃, preheatingPreheating section II temperatureTemperature 1025 ℃, and total dryingDrying preheatingPreheating time 21 min, the compressive strengthCompressive strength of preheated pelletsPellet is 656 N/P, the pulverization rate is 2.84%, and the oxidation degree is above 0.8. Under the condition of roastingRoasting temperatureTemperature of 1250 ℃ and roastingRoasting time of 27 min, the compressive strengthCompressive strength of pelletsPellet reached more than 2000 N/P.

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Optimization of Process Technology for Preparing Bayan Obo Pellets by Grate-Rotary Kiln

  • 会议论文

  • 发表日期：

    2025年

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  • Yifan Chai,
  • Shuai Ma,
  • Long Su,
  • Xiaoguang Bai,
  • Guoping Luo,
  • Shengli An,
  • Peijun Liu,
  • Suqian Gu

摘要

Strength is the key index of pellet qualityPellet quality. Grate-rotary kilnRotary kilns is a typical process of pelletPellet production, which has large production capacity and stable product quality. The preheatingPreheating and roastingRoasting system of Bayan Obo ore pelletsPellet was optimized, the effect of strength and pulverization rate was clarified, and the phase transformationPhase transformation mechanism of metal iron oxide during preheatingPreheating and roastingRoasting was revealed. The results show that under the conditions of blast dryingDrying temperatureTemperature 220 ℃, exhaust dryingDrying temperatureTemperature 330 ℃, preheatingPreheating section I temperatureTemperature 750 ℃, preheatingPreheating section II temperatureTemperature 1025 ℃, and total dryingDrying preheatingPreheating time 21 min, the compressive strengthCompressive strength of preheated pelletsPellet is 656 N/P, the pulverization rate is 2.84%, and the oxidation degree is above 0.8. Under the condition of roastingRoasting temperatureTemperature of 1250 ℃ and roastingRoasting time of 27 min, the compressive strengthCompressive strength of pelletsPellet reached more than 2000 N/P.