{"id":17740,"date":"2025-12-08T02:48:06","date_gmt":"2025-12-08T02:48:06","guid":{"rendered":"https:\/\/jda.jhy.mybluehost.me\/?p=17740"},"modified":"2026-03-09T06:44:53","modified_gmt":"2026-03-09T06:44:53","slug":"the-impact-of-pellet-pulverization-rate-on-zinc-removal-efficiency-in-rhf","status":"publish","type":"post","link":"https:\/\/www.jianjiebinder.com\/ru\/the-impact-of-pellet-pulverization-rate-on-zinc-removal-efficiency-in-rhf\/","title":{"rendered":"\u0412\u043b\u0438\u044f\u043d\u0438\u0435 \u0441\u0442\u0435\u043f\u0435\u043d\u0438 \u0438\u0437\u043c\u0435\u043b\u044c\u0447\u0435\u043d\u0438\u044f \u0433\u0440\u0430\u043d\u0443\u043b \u043d\u0430 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u044c \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u044f \u0446\u0438\u043d\u043a\u0430 \u0432 \u0420\u0412\u0421"},"content":{"rendered":"

In our previous article, “\u0412\u0430\u0448\u0430 \u0441\u0442\u0430\u043b\u044c\u043d\u0430\u044f \u043f\u044b\u043b\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u0442 \u0446\u0438\u043d\u043a? \u0412\u043e\u0442 \u043a\u0430\u043a \u0441 \u043d\u0435\u0439 \u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c\u0441\u044f<\/a>“, we explored the challenges and solutions for handling zinc-containing steel dust in metallurgical recycling processes. One of the most effective routes for recovering valuable metals from this waste is the Rotary Hearth Furnace (RHF), which relies on pelletized steel dust to achieve efficient thermal processing and dezincification.<\/p>\n\n\n\n

\"Dedust<\/figure>\n\n\n\n

Dedust Ash briquettes<\/p>\n\n\n\n

This follow-up blog dives into a frequently overlooked yet critical factor in RHF efficiency: the pulverization rate<\/strong>, and how it directly affects the dezincification rate. We also examine the technical parameters that influence the briquetting rate of RHF-bound materials.<\/p>\n\n\n\n

What is Pulverization Rate?<\/strong><\/h2>\n\n\n\n

Pulverization rate refers to the proportion of briquettes or pellets that break apart into fine particles (<1mm) during various stages of handling and processing. This disintegration compromises the structural integrity of the pellets and interferes with the RHF\u2019s operational efficiency and zinc removal performance.<\/p>\n\n\n\n

Here is the formula to calculate pulverization rate:<\/p>\n\n\n\n

In RHF-based dezincification, pulverization occurs at two critical stages:<\/p>\n\n\n\n

Stage<\/strong><\/td>Product Term<\/strong><\/td>Description<\/strong><\/td><\/tr>
Before RHF (agglomeration<\/a>)<\/td>Briquette<\/td>Cold-pressed steel dust with binder, not yet heated<\/td><\/tr>
Inside RHF<\/td>Pellet<\/td>Heat-treated briquette undergoing reduction reactions<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

1. During the Briquetting and Pre-treatment Stage<\/h3>\n\n\n\n
\"\"<\/figure>\n\n\n\n

Before entering the RHF, steel dust is mixed with binder and other additives, and is compacted into briquettes using a briquetting machine. Poor mechanical strength\u2014caused by inadequate binder, moisture imbalance, or insufficient compaction\u2014can lead to briquette breakage during briquetting, handling or transportation. Fines generated at this stage will be returned to the prepreparation and briquetting process, increasing energy consumption and costs.<\/p>\n\n\n\n

2. Inside the RHF (Thermal Processing Stage)<\/h3>\n\n\n\n
\"\"<\/figure>\n\n\n\n

Once dried and fed into the RHF, briquettes undergo high-temperature reactions and transform into metallized pellets as they begin reduction. If they lack thermal stability, they may fragment under steam pressure, thermal shock, or sintering stress. Pulverization at this stage disrupts zinc removal by reducing gas-solid contact and promoting zinc vapor re-adsorption.<\/p>\n\n\n\n

That’s why understanding and controlling pulverization rate is not just a quality control issue\u2014it’s essential to achieving high dezincification efficiency in RHF operations.<\/p>\n\n\n\n

But how exactly does this impact dezincification?<\/p>\n\n\n\n

<\/p>\n\n\n\n

The Relationship Between Pulverization and Dezincification<\/h2>\n\n\n\n

In RHF processes, dezincification refers to the proportion of zinc removed from steel dust via reduction and volatilization at high temperatures (900-1000\u2103)<\/strong>. These reactions depend on the pellet\u2019s structure and behavior under heat.<\/p>\n\n\n\n

\"dezincification<\/figure>\n\n\n\n

Steel plants require a dezincification rate of \u226590%<\/strong> for zinc-containing dust to meet the zinc content standard (Zn < 1%) necessary for reuse in blast furnaces (BF) or basic oxygen furnaces (BOF).<\/p>\n\n\n\n

Therefore, it is critical to optimize the reaction, and below are situations when these reactions are optimized:<\/p>\n\n\n\n