Cement News tagged under: manufacturing technology
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... |
Microscopy & practice08 April 2013, Published under Cement NewsIn this article Arthur Harrisson connects microscopy observations with the practical issues on the cement plant and in the market. He also identifies the benefits which are obtained by regular microscopic examination of cement clinker. Figure 1: effect of coarse silica in kiln feed. Oversized belite crystals are very difficult to combine with free lime In a previous article concerning microscopy (ICR July 2010) as a demonstration of the complexity of clinker mineralogy I took th... |
Illinois' cement keeps flowing13 March 2013, Published under Cement NewsWhen Illinois Cement, part of the Eagle Materials group, suffered a severe blockage of Type I in its 80,000t storage silo, it turned to Martin Engineering to come up with an effective and safe solution that employs remotely-controlled pneumatic cleaning technology. By Martin Engineering, USA. The Martin® Heavy Duty Whip is a portable, remotely-controlled silo cleaning tool that can be lowered into storage containers Founded in 1964, Eagle Materials is one of the USA’s largest... |
RHI's ANRKAL Q2 solution06 March 2013, Published under Cement NewsAccording to RHI’s guiding principle of providing customers with a competitive advantage through worldwide technology leadership, work is continuously underway to develop new products and technologies. The latest result of these efforts, tailored to the cement industry, is the Q-series encompassing a number of basic bricks with a new technological design, of which ANKRAL Q2 (formerly ANKRAL T2) is one. By Susanne Jörg, Gerald Gelbmann & Roland Krischanitz, RHI AG, Austria. Figure 1: A... |
Mills made in China27 February 2013, Published under Cement NewsFor more than 30 years, China-based Sinoma Technology & Equipment Group Co Ltd (Sinoma-tec) has carried out research into roller mill technology and has developed a range of vertical roller mills for grinding cement raw meal, coal, cement, slag and other types of materials. To date, the company has successfully commissioned more than 340 TRM vertical roller mills in China, Vietnam, Malaysia, Brazil and India. Figure 1: structure of TRM vertical raw mill In its two roller mill te... |
Ternary cements in Iceland20 February 2013, Published under Cement NewsProducing cement in Iceland is a unique experience. The scarcity or even absence of traditional raw materials on this volcanic island requires some inventive thinking. In addition, exposure to water, particularly seawater, heavy winds and cold weather makes special demands on the concrete and hence, the cement used in construction. This led to the development of ternary blended cement, using locally-available pozzolans. Dr Guðmundur Guðmundsson, former manager of the Iceland State Cement Wor... |
Making more of hotmeal14 February 2013, Published under Cement NewsReferences to hotmeal are common in cement plants and the concept is relatively simple – hotmeal is the kiln feed after drying and before clinkering. There is a considerable amount of information available from hotmeal which is not always collected and used. Therefore, this article takes a closer look at the useful findings that may help to steer the cement production process in the right direction. In the hotmeal a preformed cluster around belite is difficult to combine Hotmeal... |
Scanning to keep ahead30 January 2013, Published under Cement NewsIn most industries, maintaining a high profit level is synonymous with maintaining equipment efficiency and long-term reliability. This is particularly true for cement companies, as any shutdown induces high costs. To increase production rates, reduce operating costs, improve the burning process, and save energy, it pays to give particular attention to the selection of the kiln monitoring system. By Gildas Chauvel, HGH Infrared Systems, France. Figure 1: the high spatial resolution of... |