Cement News tagged under: manufacturing technology
Fly ash handling solutions20 August 2013, Published under Cement NewsPart of HeidelbergCement, Cementa AB in Slite, on the island of Gotland in Sweden, is one of Europe’s most modern and energy-efficient cement plants. Bulkteknik Sweden recently finished building a new, highly energy-efficient fly ash handling solution for the cement works. By Bulkteknik AB, Sweden. Bulkteknik Sweden recently completed a new, highly energy-efficient fly ash handling facility for Cementa’s Slite plant The new fly ash handling facility is a complete turnkey solutio... |
Using multiple raw materials17 July 2013, Published under Cement NewsThere are very few cement plant locations where a single, locally-available raw material source will be suitable for producing cement clinker. Even when the quantity of imported material is small, the costs of transporting, handling, proportioning and feeding extra raw materials can mount up and with each additional material another variable is introduced. So how does the benefit of sweetening the mix weigh against the disadvantages? How does the benefit of sweeting the raw materials ... |
Cyclic processes10 July 2013, Published under Cement NewsThe Technical Forum has covered the topic of the cyclic processes taking place in a cement kiln on a number of occasions over the last 15 years. Regular readers may think that there is not much more to be said on the subject. However, these processes remain one of the most frequent sources of questions and, therefore, it is perhaps time to revisit this topic. In one of the many cycles operating in a cement plant, alkali salts evaporate in the burning zone and are carried back to th... |
Keeping things moving17 June 2013, Published under Cement NewsITW Krafft and ITW ROCOL, suppliers of lubricants to the cement industry for over 30 years, highlight the importance of lubricating the kiln’s loose tyres and the various lubricants available. Figure 1: clearance between kiln shell and tyre To extend the life of any mechanism, good lubrication is vital. This depends on many factors including the lubrication method (manual, automatic, pulverised), the lubrication interval and the cleanliness of the environment. The choice o... |
Improving bearing life10 June 2013, Published under Cement NewsThe working conditions of a cement plant do not foster long service life for machinery due to dust, heat, moisture and vibration. Therefore, it is essential that every opportunity is taken to improve equipment efficiency and reliability. Bearings are common to most pieces of equipment and in this report, NSK Europe explains how improving the service life of this critical component can result in significant cost savings. Poor lubrication and high contamination levels cause 80 per cent of p... |
Cost versus value29 May 2013, Published under Cement NewsWhile simple grinding aids can create a modest net economic advantage, the use of fully-customised additives can maximise benefits and improve the efficiency of the grinding process as well as deliver a higher-quality end-product. By Keith Marsay, Riccardo Stoppa & Mike Sumner, Grace Construction Products, UK. Figure 1: simplified value model (including cost of CO2) Following the recent financial disturbances in world markets there has been an understandable focus on the reducti... |
Lower NOx & CO design22 May 2013, Published under Cement NewsPreheater and precalciner design play a prominent role in NOx and CO reduction from cement kilns. In this article, Cinar focusses on calciners and their impact on NOx and CO reduction efforts in the cement plant, offering cyclone combustion chamber and air-through calciners as models. By Dr Michail P Akritopoulos & Dr Tahir Abbas, Cinar Ltd, UK. Figure 1: Plant A: (a) oxygen contours in the CCC calciner and (b) contours of NO in the CCC. They show net NO generation without reductio... |
Which gypsum?14 May 2013, Published under Cement NewsTraditionally gypsum is used in cement manufacture to provide the necessary source of sulphate which retards the excessively rapid hydration of the C3A phase in cement clinker. In recent years sources of sulphate have become more varied, including the use of various waste products from other industries. A mixture of natural and recycled plasterboard gypsum Ordinary Portland cement clinker contains four main phases: C3S, C2S, C3A and C4AF. C3S and C2S are the phases that, when re... |
Meeting future targets03 May 2013, Published under Cement NewsWhile this year marks Fives FCB’s 80th anniversary in the cement industry, the company also has 35 years of precalcining experience. Its latest precalciner with combustion chamber, the ‘Zero-NOx precalciner’, incorporates a design with direct flows which minimises NOx emissions while allowing the use of a wide range of fuels, from gas or fuel oil to anthracite or alternative solid fuels (ASF). In this article, Fives FCB shares some case studies of projects undertaken at different cement plan... |
NESHAP compliance made easy17 April 2013, Published under Cement NewsAs the US Environmental Protection Agency finalised its amendments to the air toxics rules for Portland cement production and expects the industry to comply fully by 2015, Austria-based filter specialist Scheuch offers its patented EMC technology as the key solution to dust emission issues. By Alois Hermandinger, Scheuch GmbH, Austria. Figure 1: EMC filter plant at Holcim (Germany) AG, Lägerdorf plant The US Environmental Protection Agency (EPA) has finalised amendments to th... |