04
2012
-
01
Analysis of the Causes of Ball Runaway in Ball Mills – Zhangqiu RuiNian Steel Balls
Author:
The Fankou Lead–Zinc Mine has an annual output of 180,000 tonnes of lead–zinc metal ore, with the ore primarily occurring as massive lead–zinc–pyrite ore in a limestone lithofacies; it is classified as brittle and easily grindable ore.
The Fankou Lead–Zinc Mine has an annual output of 180,000 tonnes of lead–zinc metal ore. The ore is predominantly massive lead–zinc–pyrite ore interbedded with limestone, and is classified as a brittle, easily grindable ore. The beneficiation plant is equipped with 12 ball mills, including five MQG2736-type ball mills used for primary grinding. The feed end of the MQG2736 ball mills is fitted with rubber liners, the mill shell is lined with manganese steel, and both the discharge-end center liner and the grate plate are made of manganese steel.
1 The Running Ball Phenomenon
The MQG2736 ball mill has a ore-processing capacity of approximately 60 t per unit per hour, and one set of liners can process about 300,000 t of ore. Under normal operating conditions, one drum of φ80 mm alloy steel balls—approximately 630 kg—is replenished each day (three shifts). In the past, the MQG2736 ball mill has experienced ball loss; however, in 2010, Units No. 1 and No. 9 of the MQG2736 model suffered particularly severe ball loss, with virtually all the φ60 mm alloy steel balls being worn away. As a result, one drum had to be replenished per shift, requiring two drums of alloy steel balls to be added daily. A temporary remedial measure was to weld steel rods and iron blocks into the gaps, but this solution wore out quickly, leading to renewed ball loss. Given the heavy production workload, the only option was to wait until the mill liners were completely worn out and then shut down the mill for a full liner replacement—a process that takes seven consecutive days—thereby placing enormous pressure on the company’s cost-control efforts.
Download link pic/other/2012-01-04-14-09-087.pdf
To obtain the full text, please contact louis@ruiniansteelball.com , thank you.
Next page
Providing steel ball product solutions!
Ruinion Casting & Forging has been dedicated to the grinding industry for over a decade.
Contact Us
Email: steelball@ruiniansteelball.com
Address: Wuji Industrial Zone, Guanzhuang Subdistrict Office, Zhangqiu City, Shandong Province, China
Follow Rui Nian