Cement plants worldwide face converging pressures: the need to reduce CO₂ emissions by using clinker substitutes, increase the use of alternative fuels (AF), and compensate for staff shortages while handling increasingly variable material qualities. Weighing and dosing technology is no longer an operational detail but quickly becoming a strategic bottleneck in modern plant performance.
Historically, cement processes were designed to tolerate moderate variability. High clinker content ensured uniform cement quality, coal as a relatively stable burning fuel, and volumetric dosing approaches were often sufficient to maintain an acceptable process. Those days are over: Modern plants produce cement where the clinker content is substantially lower, making additives and SCMs far more influential on final quality. At the same time, alternative fuel usage is rising, increasing variability in bulk density, moisture and particle structure. Coal usage is decreasing, which demands extremely small but highly accurate feed rates to stabilize the burning process. Meanwhile, the use of new, very fine clinker substitutes continues to grow, including calcined clays and finely ground limestone. With production limits tightening, this leaves far less operational buffer for imprecision.
Despite regional differences like varying regulatory demands, fuel markets and climate conditions, several global trends converge to make weighing and dosing increasingly critical. In Europe, strict CO₂ frameworks are leading to the convergence of production lines, the growth of facilities focused on grinding and blending, and more complex material flows between specialised sites. This places greater demands on reliable, accurate weighing infrastructure. In Southeast Asia, countries such as Thailand face strong seasonal shifts, fluctuating moisture levels and highly variable alternative fuels. They require dosing systems that can remain stable under rapidly changing material behaviour. In regions like North America, where CO₂ pricing is lower, the drive for economic competitiveness is prompting plants to switch fuels and optimise processes without compromising stability. Across all markets, the common reality is rising operational pressure.
“Weighing and dosing technology is no longer an operational detail. It is quickly becoming a strategic bottleneck in modern cement plant performance.”
Simon Rappold, Head of Sales Alternative Fuels
Rising Complexity in Material Flow
Material variability has become the norm in modern cement production. Alternative fuels now arrive with inconsistent particle size, density, moisture and shape, and as recycling increases, AF quality often declines further making stable feeding nearly impossible without robust gravimetric control. At the same time, coal feed rates have dropped from several tonnes per hour to just a few hundred kilograms, where even minor inaccuracies can destabilise the flame.
The usage of fine supplementary materials to reduce the clinker content further intensifies the challenge. Calcined clays, finely ground limestone, and other supplementary cementitious materials (SCMs) can deliver clinker-like performance in the final cement, but they require different dosing and mixing conditions. Because clinker substitution is only feasible within defined limits, maximizing the substitution rate demands highly precise dosing and tight process control. Additional challenges include meeting mixing requirements, managing cement color, and controlling concrete setting and drying behavior. As clinker content falls, the margin for error narrows, and small deviations in dosing can directly affect strength development or setting behavior.
These conditions make continuous monitoring essential. Plants must maintain accuracy without interrupting the process, as calibration checks must occur within an unbroken material flow. Combined, these factors place weighing and dosing systems under far greater operational demands.
Coriolis Principle & Mass Flow Measurement for the Cement Industry
Gravimetric Systems as Stability Anchors
The requirement of gravimetric feeding is no longer a technological preference but a direct response to the operational pressures shaping the cement industry. In practice, this shift is most visible in the usage of Coriolis-based mass flow measurement for dust and meal applications, a principle Qlar pioneered for harsh cement environments. Unlike standard measurement systems using gravimetric force, Coriolis measurement remains stable even when dust, vibration, material buildup or airflow disturb the surroundings – a decisive advantage under the fluctuating conditions as in the cement production.
Qlar’s MultiFlex NG/NG+ feeding system, designed specifically for highly variable alternative fuels, exemplifies this resilience. Plants increasingly rely on it as AF qualities decline due to expanding recycling streams, leaving the cement industry with lighter, more inconsistent materials that require high flexibility and greater control to feed reliably. As alternative fuel substitution increases, coal feed rates in modern kilns have declined from historical levels of 4-12 t/h to just 0.4-2 t/h. Dosing technologies such as MultiCell Min and MULTICOR K provide the precision required to stabilize flame behavior at very low mass flows. At these ranges, slight deviations in constancy immediately influence kiln temperature zones, making gravimetric accuracy a prerequisite for thermal stability.
High-quality additives have similar requirements. The Coriolis-based MULTICOR S mass flow meter enables operators to mix finely ground materials such as calcined clay, fine limestone, or other SCMs with traditional clinker cement in the correct proportions. These SCMs no longer play a secondary role in cement quality; with clinker content dropping toward 60% or below, even small proportioning errors translate directly into measurable performance shifts. Gravimetric dosing is becoming the decisive factor in maintaining strength development and consistency for the subsequent concrete.
Across all applications, one capability is emerging as a defining industry requirement for dosing systems: continuous, onstream calibration. Qlar feeders continuously verify dosing accuracy during operation by comparing the measured mass flow with static reference values from load cells, using the DISOCONT Tersus weighing controller. This in-process cross-check enables uninterrupted feeding across all applications. With cement lines running 24/7, changing material characteristics and workforce shortages that reduce opportunities for manual intervention, this automated verification has become central to maintaining trustworthy process data — especially in the light of increasing automation of all processes
“The cement plant of the future will succeed or fail based on its ability to keep material flows precise, stable and verifiable.”
Simon Rappold, Head of Sales Alternative Fuels
Looking Ahead: Precision as the Decisive Capacity of Future Plants
As these pressures intensify, the next evolutionary step in dosing and weighing will be defined less by incremental improvement and far more by the industry’s accelerating need for flexibility, resilience and adaptive control. Plants already recognize that the consistency of alternative fuels is deteriorating as recycling increasingly extracts the higher-quality fractions, leaving cement producers with fuels that burn less predictably and are even harder to dose accurately.This trend will continue, forcing systems to handle fuels whose particle behaviour, moisture and calorific response shift not just year to year, but batch to batch.
At the same time, the operational window inside the kiln will tighten further. Plants already rely on very low coal feed rates for flame stabilization – sometimes significantly less than 1t per hour – making the process extraordinarily sensitive to fluctuations. As substitution rates rise, this sensitivity will only increase. The kiln of the future will no longer be stabilized by “robust” thermal behavior from coal but by the accuracy of the alternative fuel mass flows entering it. Where past operators could “feel” the kiln through experience, future kiln control will depend on uninterrupted, validated dosing data communicated directly to the control room and its algorithms. Workforce dynamics and continues automatization reinforce this shift.
Next to the burning process, the development of new types of cement with as little clinker content as possible is becoming increasingly important. Novel materials with new properties are entering the market and must be dosed with high precision to maximize clinker substitution while maintaining sufficient strength values for the subsequent concrete. Operators already see that once clinker drops, even small dosing deviations translate directly into measurable changes in strength and performance of the concrete. Future dosing systems will therefore have to treat SCMs not as additives but as primary, quality-defining materials, and feed them with a level of precision that cannot be achieved without gravimetric dosing. Plants will therefore require dosing and weighing systems that self-check, self-calibrate and self-correct, to provide stable, high-quality data even when hands-on expertise is limited.
Finally, the infrastructure around cement plants will change. As clinker production becomes more centralized and grinding and blending units operate independently, the movement of materials between facilities will grow substantially. This drives demand for automated weighbridges, rail weighing and yard management systems that keep multi-material logistics both efficient and traceable.
The strategic direction for cement production is becoming unmistakably clear: the cement plant of the future will succeed or fail based on its ability to keep material flows precise, stable and verifiable. Under rising CO₂ pressure, reduction of clinker, volatile fuel streams and shrinking workforces, precision in dosing and weighing is no longer a technical preference. It is the condition that makes low-carbon cement production possible at all.
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