Cement News tagged under: manufacturing technology
Limestone as MAC16 January 2013, Published under Cement NewsThe addition of small amounts of limestone in Portland cement has been practiced since the early 1980s. The inclusion of limestone as a minor additional constituent (MAC) offers economic and technical benefits to the cement producer. However, despite its wide acceptance, some debate remains over the effects of limestone on the concrete ultimately produced by the cement. The addition of limestone as a minor additional constituent offers economic and technical benefits Since the... |
Chinese co-processing21 December 2012, Published under Cement NewsWhile co-processing in the cement industry has only recently been introduced to China, several initiatives are already well underway to spread the practice to more cement producers to reduce landfill sites and curb GHG emissions. Phase one of the Sino-Norwegian project to pilot waste studies and co-processing in cement kilns has successfully been achieved and now the goal is to prepare a nationwide programme for co-processing in the cement industry. By Yan Da-Hai1, KH Karstensen2, Peng Zheng... |
Lowering NOx and SO219 December 2012, Published under Cement NewsThere are several options for reducing NOx and SO2 in the cement pyroprocess. However, the solution selected must be both cost-effective and flexible in terms of raw materials, fuels and operating conditions. Making the correct choice requires the necessary process know-how and advanced technical solutions to handle NOx and SO2 emissions at all levels. FLSmidth is one of the few companies to offer both. Lars Schultz explains. Dialogue between FLSmidth specialist and customer, SNCR inj... |
Reliable performer03 December 2012, Published under Cement NewsCompared with conventional solutions, a new drive concept with asynchronous squirrel-cage motors at the Lafarge Cement plant near Pécs, Hungary, boasts minimum service and maintenance costs. And if that was not enough, higher efficiency is also helping improve the bottom line. By Alf Banse, Siemens, Germany and Jozsfe Janovits, Lafarge Cement Hungary. The substitution of the drive system has had no negative impact on the grinding process at Lafarge Cement near Pécs, Hungary N... |
MPS: more than meets the eye19 November 2012, Published under Cement NewsVertical roller mills are not only used for grinding cement raw materials but also find an application in grinding a wide variety of coal types in cement and power plants. Gebr Pfeiffer SE (GPSE) describes its vertical roller mills for coal grinding and provides a case study of an MPS225BK installed at CBR’s Lixhe cement works in Belgium. By Dr Caroline Woywadt and Rüdiger Sonnen, Gebr Pfeiffer SE, Germany. Figure 1: MPS coal grinding mill with SLS high-efficiency classifier ... |
Increasing the momentum22 October 2012, Published under Cement NewsA TEC GRECO’s Flexiflame burners facilitate the control of the flame geometry in the kiln. Further burner optimisation has brought the benefits of a reduced NOx generation as well as ensuring better combustion of petcoke and solid alternative fuels. A TEC GRECO explains. The arrangement of the primary air outflow as individual jets has a very favourable effect on the combustion, as it assures rapid mixing of the hot secondary air into the flame The FlexiflameTM burner is the... |
Free lime reduction08 October 2012, Published under Cement NewsThe occurrence of high free lime can result in poor clinker quality and inefficient burning. Chemical variance in the raw materials and changes to the burning conditions can also upset the kiln balance, which can lead to other problems such as the formation of snowballs. So what are the main factors that will help to reduce high free lime? Figure 1: cluster of early-formed C2S crystals (field of width 750µm) As in most walks of life, cement manufacturing has developed a degre... |
Elevating service life26 September 2012, Published under Cement NewsThe modernisation of Lafarge’s Wössingen plant in Baden-Württemberg, Germany, included improvements on the existing belt bucket elevator to the raw mill. The intralogistics specialist Beumer was awarded a contract to supply its heavy-duty bucket elevators which offer increased conveying capacity and longer service life. Thanks to this new technology, the existing bucket elevator could be easily altered. German-based Beumer Group takes us through the project. Lafarge’s Wössingen plant,... |
High-efficiency cement grinding17 September 2012, Published under Cement NewsFor more than a quarter of a century the ThyssenKrupp Polysius’ POLYCOM® high-pressure grinding roll (HPGR) has been in successful operation. More than 65 of the presses are working in highly-efficient clinker grinding systems around the world. By using the POLYCOM as a stand-alone grinding machine (finish grinding circuit) a reduction in specific power consumption of around 50 per cent compared to conventional ball mill circuits is achievable. The high compression stressing applied inside t... |
Continuous flue gas monitoring12 September 2012, Published under Cement NewsStricter emission legislation has increased the need for continuous emission monitoring. For cement producers, the high-temperature and high-dust environment in the kiln has presented various challenges in meeting this requirement. However, Spenner Zement Co of Erwitte, Germany, called in the help of Enotec to provide the solution to this particular problem. By Enotec, Germany. Designed specifically for the cement industry and featuring water cooling, a rotating device and automati... |