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不锈钢粉尘与铬铁矿制备含碳热压块强度优化

Strength optimization of carbon-containing hot-pressing briquettes prepared by stainless steel dust and chromite

  • 摘要: 不锈钢粉尘是传统钢铁冶炼过程中产生的二次固废,含有铁、铬、镍等有价金属组元,其粒度较细、化学成分复杂,易对环境产生污染。铬铁矿是重要且稀缺的自然资源且含有铁、铬等有价金属元素,在传统冶炼工艺中存在污染高、能耗高、成本高等问题。本文以不锈钢粉尘与铬铁矿为原料,通过热压技术制备含碳热压块,为转底炉等高效还原工艺提供优质原料,实现铁、铬、镍等金属组元的高效回收。该方法不仅可提高铬铁矿冶炼效率,降低原生矿进口依赖,还能减少固废堆存带来的环境威胁,符合固废资源化和绿色冶金的要求。本文系统研究了原料配比、热压成型温度、热压成型保压时间及热压成型压力关键工艺参数对不锈钢粉尘与铬铁矿含碳热压块抗压强度的影响,揭示了各条件对含碳热压块抗压强度的作用机制。通过试验优化,确定了最优制备工艺参数,为不锈钢粉尘和铬铁矿的固废资源化提供了可行的技术方案。试验结果表明,不锈钢粉尘与铬铁矿耦合制备含碳热压块的较优配比(质量分数比)为60%∶40%,焦煤外配比例(质量分数)为27.97%,成型温度为250 ℃,成型压力为35 MPa,成型保压时间为2 min,含碳热压块抗压强度达到756.7 N,满足转底炉入炉强度要求,这为含铁资源协同利用提供了新思路和理论基础。

     

    Abstract: Stainless steel dust is generated as a secondary solid waste during conventional steelmaking processes. It contains valuable metal components such as iron, chromium, and nickel, and is characterized by fine particle size and complex chemical composition, making it prone to causing environmental pollution. Chromite is recognized as an important and scarce natural resource, containing valuable metal elements including iron and chromium. Traditional smelting processes for chromite are faced with triple challenges of high pollution, high energy consumption, and high cost. In this study, stainless steel dust and chromite ore were utilized as raw materials to prepare carbon-containing hot-pressing briquettes through hot-pressing technology, aiming to provide high-quality feedstock for efficient reduction processes such as the rotary hearth furnace and achieve effective recovery of metal components including iron, chromium, and nickel. This approach was designed not only to enhance the smelting efficiency of chromite and reduce dependence on the import of primary ores, but also to mitigate environmental threats caused by solid waste accumulation, thereby aligning with the requirements of solid waste resource utilization and green metallurgy. This paper systematically investigated the effects of key process parameters including raw material ratio, hot-pressing briquetting temperature, hot-pressing briquetting holding time, and hot-pressing briquetting pressure on the compressive strength of carbon-containing hot-pressing briquettes made from stainless steel dust and chromite. It also revealed the mechanisms by which these conditions influence the compressive strength of the carbon-containing hot-pressing briquettes. Through experimental optimization, the optimal preparation parameters were determined, providing a feasible technical solution for the resource recovery of stainless steel dust and chromite. The experimental results show that the optimal formulation for preparing carbon-containing hot-pressing briquettes from stainless steel dust and chromite ore is determined as a 60% to 40% ratio between the two, with an external addition of 27.97% coke coal. The optimal processing parameters are identified as a forming temperature of 250 ℃, a forming pressure of 35 MPa, and a holding time of 2 min. Under these conditions, the compressive strength of the carbon-containing hot-pressing briquette reaches 756.7 N, which meets the strength requirement for charging into a rotary hearth furnace. This work provides a theoretical basis and a novel approach for the synergistic utilization of iron-bearing resources.

     

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