Cement News tagged under: kiln feed

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Dealing with dust

16 February 2021, Published under Cement News

With dust chemistry varying between direct operation when the raw mill is out of action and indirect operation when the raw mill is running, finding a destination for baghouse dust while maintaining a homogenous kiln feed is a long-standing issue in cement production. By John Kline and Benjamin Kline, Kline Consulting LLC, USA. Figure 1: a typical raw mill and kiln feed configuration The simple question of what to do with baghouse dust when the raw mill is out of operation has p...

Loss on ignition

28 September 2016, Published under Cement News

The loss on ignition of a raw material, cement or a clinker sample is the amount of weight lost through raising the temperature of the material to a predetermined level. As an indicator it can be used to monitor and improve the quality of the final product. Clinker stored outside in wet conditions will experience an increase in LOI Weight loss during heating can be due to the evaporation or volatilisation of a variety of components of the sample. Water is lost at 100-105˚C, orga...

How do blending beds stack up?

27 September 2016, Published under Cement News

Dr Clark tackles the science behind longitudinal blending beds for crushed raw materials. He discusses the part played by blending time, bed dimensions, volume, layering and stacker speed in the effectiveness of the blending bed. Blending beds smooth the variation in raw materials before they are ground in the raw mill to produce the kiln feed The vast majority of modern cement plants have some sort of blending bed for smoothing the variation in the raw materials before they are...

Kiln feed and clinker quality

16 December 2013, Published under Cement News

Commissioning a new cement plant generally centres around the performance in terms of tonnes per day, kWh/t, or other operational matters. It is easy to lose sight of the need to achieve the required quality while fulfilling these other requirements. The following article describes a case study of quality issues and the means of improvement during the commissioning of a 4000tpd precalciner kiln. Coarse (brown) alite crystals, coarse prismatic C3A and degraded alite indicating poor-qua...