Investigation into the Hot Briquetting of Fine‐Grained Residual Materials from Iron and Steel Production,Steel Research International

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Investigation into the Hot Briquetting of Fine‐Grained Residual Materials from Iron and Steel Production
Steel Research International ( IF 1.9 ) Pub Date : 2020-07-09 , DOI: 10.1002/srin.202000237
Laura Lohmeier ₁ , Ralf Wollenberg ₁ , Hans-Werner Schröder ₁

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Hot briquetting tests with mixtures of direct reduced iron (DRI) pellets and residues of the Midrex direct reduction process are conducted on a hydraulic piston press with a closed die. The trials seek to test the feasibility of recycling these residues by introducing them directly into hot briquetted iron (HBI). The inclusion of residues is possible if a high pressure of 350 MPa and a high briquetting temperature of 800 °C are applied. It is ascertained that up to 20 wt% of the HBI can consist of residues and still meet the quality requirements for the safe transportation to the steel plant if the mixture contains sufficient HBI screened fines and HBI classifier dust. Under such conditions, the HBI briquettes have a compressive strength of >300 MPa, an abrasion resistance of >80%, and, most importantly, an apparent density of >5 g cm⁻³. It is further shown that the hot briquetting of Midrex residues is also possible without DRI pellets so that they can be reused as educt in the Midrex direct reduction process.

中文翻译：

钢铁生产中细颗粒残渣热压块的研究

使用直接还原铁（DRI）球团和Midrex直接还原过程中的残留物的混合物进行热压块试验是在带有封闭模具的液压活塞压力机上进行的。该试验试图通过将这些残留物直接引入热压铁块（HBI）中来测试回收这些残留物的可行性。如果施加350 MPa的高压和800°C的高压块温度，则可能会包含残留物。可以确定的是，如果混合物中含有足够的HBI筛分细粉和HBI分级粉尘，则高达20 wt％的HBI可以由残留物组成，并且仍符合安全运输到钢厂的质量要求。在这种情况下，HBI型煤的抗压强度> 300 MPa，耐磨性> 80％，最重要的是表观密度> 5 g cm⁻³。进一步表明，没有DRI颗粒也可以对Midrex残留物进行热压块，这样它们就可以在Midrex直接还原过程中用作离析物。

更新日期：2020-07-09

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