Abstract Electric arc furnace dust is a waste by-product of electric arc furnaces in steel production. This material is hazardous to the environment due to the presence of metals, such as chromium, lead, and cadmium; in addition to these, there is zinc in its composition. One of the main ways of recovering zinc from the electric arc furnace dust is carried out in rotary kilns called Waelz kilns. This work aims to develop a model of a Waelz kiln and evaluate the impact of processing sludge from an industrial effluent treatment plant as a feed along with electric arc furnace dust, with and without the inclusion of a drying system for the sludge and a thermal integration system with the Waelz slag. The model, validated against industrial data plant, revealed an optimum operational point, resulting in a zinc recovery of 98.3 %, which is equivalent to an increase in the production by 6.2 %. The scenario with direct sludge feed into the kiln resulted in a maximum zinc recovery rate of 89 %. The results from the sludge drying scenario imply a zinc recovery of 94 % and represent a viable alternative for reducing the amount of solid waste generated in the zinc production plants that use the Waelz kiln by 1100 t/year per tonne of sludge treated. Furthermore, it also increased zinc production to 1300 t/year.

中文翻译：

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用于危险废物处理的改良 Waelz 工艺的热环境评价

摘要 电弧炉粉尘是钢铁生产中电弧炉的废弃副产品。由于存在铬、铅和镉等金属，该材料对环境有害；除此之外，其成分中还含有锌。从电弧炉粉尘中回收锌的主要方法之一是在称为 Waelz 窑的回转窑中进行。这项工作旨在开发一个 Waelz 窑模型，并评估处理工业污水处理厂的污泥作为进料以及电弧炉粉尘的影响，包括和不包括污泥干燥系统和热集成系统与 Waelz 渣。该模型针对工业数据工厂进行了验证，揭示了最佳操作点，锌回收率为 98.3%，这相当于产量增加了 6.2%。将污泥直接送入窑中的方案的最大锌回收率为 89%。污泥干燥方案的结果意味着锌回收率为 94%，并且代表了一种可行的替代方案，可将使用 Waelz 窑的锌生产厂产生的固体废物量减少 1100 吨/年/吨处理的污泥。此外，它还将锌产量提高到 1300 吨/年。污泥干燥方案的结果意味着锌回收率为 94%，并且代表了一种可行的替代方案，可将使用 Waelz 窑的锌生产厂产生的固体废物量减少 1100 吨/年/吨处理的污泥。此外，它还将锌产量提高到 1300 吨/年。污泥干燥方案的结果意味着锌回收率为 94%，并且代表了一种可行的替代方案，可将使用 Waelz 窑的锌生产厂产生的固体废物量减少 1100 吨/年/吨处理的污泥。此外，它还将锌产量提高到 1300 吨/年。