The grading issue of rod mills

Product particle size distribution: Standard sieve (wt% passing rate): 8 mesh (2380 microns) – 100; 14 mesh (1410 microns) – 98-100; 40 mesh (420 microns) – 90-95; greater than 325 mesh –

The furnace we use is of the four-nozzle type

The furnace we use is of the four-nozzle type

Is 75:65:50=3:4:3 a weight ratio or a count ratio?

What should be the amount of rods used in the coal grinding machine at Jiangyin Yaite? For 70 t/h of coal, 100 t of rods are used – is the load too high? Or is the amount of rods used too low?

What should be the amount of rods used in the coal grinding machine at Jiangyin Yaite? For 70 t/h of coal input, if 100 t of rods are used, is the load too high? Or is the amount of rods used too low?

We are ∮75:∮65:∮55=3:4:3, with 3:4:3 being the weight ratio; the maximum loading capacity is 167 tons.

This post was last edited by sean816 on 2011-4-24 21:13. Wear-resistant steel rods for rod mills are suitable for a wide range of users and manufacturers of rod mills and coal grinding mills, including cement plants, power plants, mines, quartz sand factories, silica sand factories, sand aeration plants, coal chemical industries, and aerated concrete factories. The steel rods currently in use in the market are produced by steel mills through rolling processes; they require low technical standards, have extremely poor wear resistance, and result in high consumption during use, leading to significant waste of ** resources. Our company, Shandong Huamin Steel Ball Co., Ltd. (www.huamin.cn), was established in 1986 and is located in the Chengdong Industrial Park in Zhangqiu, Shandong (45 kilometers east of Jinan). It is dedicated to the research and production of the most wear-resistant steel rods for rod mills and steel balls for ball mills. Under the call to **promote energy conservation for the benefit of future generations. Targeting the consumable products currently on the market (steel rolling bars). Therefore, our company (Shandong Huamin Steel Ball Co., Ltd. www.huamin.cn) invested heavily to hire various experts to specialize in the research of this product, with the aim of developing steel rods with higher wear resistance to replace the current consumable steel rods in use domestically. After years of research, our company has finally developed a new type of wear-resistant alloy steel rod. The wear resistance of this wear-resistant steel rod is 2 to 6 times that of rods made by rolling. Each year, it is possible to **save hundreds of thousands of tons, or even tens of millions of tons, of steel. The new type of alloy wear-resistant steel rods produced by our company (Shandong Huamin Steel Ball Co., Ltd. www.huamin.cn) are manufactured using the latest methods. Their dimensions can be adjusted to meet customers’ requirements, thereby enhancing flexibility and eliminating unnecessary waste. At the same time, it extends the service life, saves costs, and reduces the workload for workers. Don’t worry about stopping the mill and adding steel rods every day – it even **increases production**. 1. Analysis of the broken rod phenomenon: (1) Causes: A. Material: internal porosity. Regarding the issues with steel billets in steel mills, only very large-scale mills are able to meet the stringent technical requirements involved, especially for those with a diameter of 70 mm or more. While most steel mills can produce such billets, their compression ratio and hardenability are low, meaning that their structure is not dense enough. B. Process: The internal stresses have not been relieved. Bar breakage is like an explosion, occurring from within; the process of producing steel bars in steel mills is similar to inflating a balloon – it is necessary to eliminate the internal stresses in order to prevent bar breakage. (2) Solution: A. Focus on the materials. a. Try to use materials from **super-large steel mills** ； b. The new alloy material developed by our company was specifically created by industry experts in wear resistance from Tsinghua University and Dalian University of Technology, taking into account the conditions under which rod mills operate. It possesses excellent hardenability, and is produced by a **very large steel manufacturer (under a confidential agreement). B. Processing technology: The steel rod processing technology developed by our company has been granted a **patent**; it significantly improves the wear resistance of the steel rods, and breakage does not occur (we will replace them free of charge if they break). C. The size specifications can be adjusted flexibly; generally, the steel bars supplied by steel mills are 6 meters long. If you use 4-meter long bars, then the 2 meters that remain will be wasted. Our company can produce bars to custom lengths. D. The wear-resistant steel rods produced by our company using new materials and processes extend their service life, reduce costs, and lessen the workload on workers. Don’t worry about stopping the mill and adding steel rods every day – it even **increases production**. 2. Regarding the hardness of the steel rod: The optimal hardness level is 45-50. If it is lower than this, the rod is too soft and not wear-resistant; if it is higher, it is too hard and brittle, making it prone to breaking ； Additionally, in terms of manufacturing processes, domestic manufacturers can only achieve an HRC hardness of over 45 on the surface of the steel rod for a maximum of one centimeter; beyond that distance, the surface becomes identical to that of a round steel bar. The wear-resistant steel rods used in our rod mills are manufactured in accordance with international standards. Moreover, thanks to our proprietary manufacturing process (which has been patented), the overall performance of these steel rods is improved. For example, while ordinary steel rods have a surface hardness of HRC 45 and an internal hardness of HRC 10, our rods can achieve a surface hardness of HRC 50 and an internal hardness of HRC 25. 3. Differences between wear-resistant steel rods, ordinary steel rods, and round bars: Round bars are raw materials produced by steel mills; they are not finished products. Using them as steel rods in rod mills leads to various problems such as rod breakage and failure (with sharp ends at both ends). Their hardness is only 20, meaning they are not wear-resistant at all! Steel rods are produced by further processing of round steel; their surface hardness is 45-50, making the surface wear-resistant while the interior is not. Wear-resistant steel rods are the true steel rods for rod mills. The above information is original to me; any reproduction is prohibited.