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Loesche hands over world’s largest slag mill

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World Cement,

In September 2011, Loesche received an order from Taigang Group International Trade Co., Ltd (China) for a vertical mill type LM 63.3+3 for grinding granulated blastfurnace slag. This was to be the largest slag mill in the world. In March 2014, the plant went into operation in the steelworks of TISCO, Shanxi Taigang Stainless Steel Co. Ltd in Taiyuan, and attained a new record product rate of 255 tph of blastfurnace slag meal after only a short period of operation.

The first Loesche LM 63.3+3 mill commenced production in 2009 in Nallalingayapalli, India, and has proven to be a reliable mill for cement grinding. After examining the feed material and conducting diverse tests in the Loesche pilot grinding plant, the company recommended that one large mill with a grinding table diameter of 6.3 m (instead of two smaller mills) be installed in the Nallalingayapalli facility. This was to achieve the planned product capacity of 360 tph of OPC or 355 tph of PPC. The advantage of an LM 63.3+3 instead of two smaller mills lies in the lower investment costs, as well as lower maintenance expenses. The LM 63.3+3 in Nallalingayapalli attains a peak value of 367 tph of OPC at 3000 Blaine or 371 tph of PPC at 3400 Blaine.

In the TISCO steelworks, the LM 63.3+3 has now been used for the pure grinding of granulated blastfurnace slag for the first time. The mill is driven by a motor with an output of 7400 kW, the most powerful motor to have been installed so far by Loesche in a mill. The mill has achieved the projected guarantee values of 255 tph of granulated blastfurnace slag at a fineness of 4400 Blaine. This is also ensured by the newly developed Loesche LDC classifier, used in the grinding plant and ideally customised for use with the Loesche mills.

Adapted from press release by Rosalie Starling

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