Steel mill solid waste transformation: Optimizing converter sludge recycling through RHF technology

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL Minerals Engineering Pub Date : 2024-09-10 DOI:10.1016/j.mineng.2024.108970

Dongjie Zhou , Weitong Du , Jiayong Qiu , Chuanbo Zheng , Dianchun Ju , Shui Yu , Haiwei Yao , Han Ma , Rui Mao

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Abstract

Current methods for treating converter sludge include reintroducing it into the sintering or pelletizing process. However, this method leads to the enrichment of zinc in the blast furnace, which affects the stability of the production operation. To solve this problem, a direct reduction process utilizing multi-solid waste collaborative rotary hearth furnace (RHF) has been implemented in steel plants to recover and safely dispose of valuable components in waste. The laboratory results show that the dezincization rate of the metallized pellets is 99.12 % and the metallization rate is 80.51 % under the premise of reducing 50 °C by calcination at 1200 °C for 15 min in the nitrogen atmosphere. In the industrial test conducted in RHF production line of Shagang from March 2022 to August 2023, the temperature in the high temperature zone was reduced by 50 °C, and the time in the high temperature zone was controlled to 15 min. The industrial test results showed that the residual zinc content in the metallized pellets was 0.63 %, and the metallization rate was about 75.12 %. These particles can be used as feedstock or coolant in the steelmaking process. The average grade of by-product zinc oxide coarse powder can reach 65.88 %, which can be further processed into zinc products with remarkable economic benefit. Through RHF integrated management of converter sludge and other solid waste in steel mills, metallized pellets and high-value products can be produced, which can effectively reduce solid waste in steel enterprises and improve resource utilization.

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钢厂固体废物转化：通过 RHF 技术优化转炉污泥回收利用

目前处理转炉污泥的方法包括将其重新引入烧结或球团工艺。然而，这种方法会导致锌在高炉中富集，影响生产操作的稳定性。为解决这一问题，钢铁厂采用了一种利用多固体废物协同回转炉（RHF）的直接还原工艺，以回收并安全处置废物中的有价成分。实验室结果表明，在氮气环境中，1200 °C 煅烧 15 分钟，在降低 50 °C 的前提下，金属化球团的脱锌率为 99.12%，金属化率为 80.51%。2022 年 3 月至 2023 年 8 月在沙钢 RHF 生产线进行的工业试验中，高温区温度降低 50 ℃，高温区时间控制在 15 分钟。工业试验结果表明，金属化颗粒中的残锌含量为 0.63%，金属化率约为 75.12%。这些颗粒可用作炼钢过程中的原料或冷却剂。副产品氧化锌粗粉的平均品位可达 65.88%，可进一步加工成锌产品，经济效益显著。通过 RHF 综合治理钢厂转炉污泥和其他固体废弃物，可生产出金属化球团和高价值产品，可有效减少钢铁企业的固体废弃物，提高资源利用率。

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来源期刊

Minerals Engineering 工程技术-工程：化工

CiteScore

8.70

自引率

18.80%

发文量

519

审稿时长

81 days

期刊介绍： The purpose of the journal is to provide for the rapid publication of topical papers featuring the latest developments in the allied fields of mineral processing and extractive metallurgy. Its wide ranging coverage of research and practical (operating) topics includes physical separation methods, such as comminution, flotation concentration and dewatering, chemical methods such as bio-, hydro-, and electro-metallurgy, analytical techniques, process control, simulation and instrumentation, and mineralogical aspects of processing. Environmental issues, particularly those pertaining to sustainable development, will also be strongly covered.