Gravity Type Blending Silos

Gravity-type homogenizing silos (or continuous blending and storage silos) that are used in modern plants reduce power consumption. In these silos, material funnels down one of many discharge points, where it is mixed with the help of an inverted cone. Although gravity-type silos may not give the same blending efficiency as air-fluidized systems, more and more new plants prefer gravity-type silos because of the significant power consumption reductions they provide. Silo retrofit options are cost-effective when the silo can be partitioned with air slides and divided into compartments which are sequentially agitated. 

Indian Flag In current Indian scenario, this technology is reported to be already widely used.

Development Status Products

Gravity Type Blending SilosCosts & Benefits

Parent Process: Raw Material Preparation
Energy Savings Potential

1.0 to 2.5 kWh of electricity can be saved for each ton of raw meal processed. 

CO2 Emission Reduction Potential

Chinese Flag In China, for every ton of raw material processsed, 0.8 to 2.5 kg of CO2 can be saved with this technology

Indian Flag For every ton of raw material processsed, 0.8 to 2 kg CO2 can be saved in India. 


Retrofitig costs are estimated to be US $3.7/t-raw material  (assuming US$550 thousand per silo and an average capacity of 150,000 tonnes annual production).  

Indiann Flag In India, retrofiting costs are reported to be around $35 per ton of silo capacity

Gravity Type Blending Silos Publications

Energy Efficiency Improvement Opportunities for the Cement Industry

The U.S. Environmental Protection Agency’s (EPA) energy guide, Energy Efficiency Improvement and Cost Saving Opportunities for Cement Making, discusses energy efficiency practices and technologies that can be implemented in cement manufacturing plants. This ENERGY STAR guide provides current real world examples of cement plants saving energy and reducing cost and carbon dioxide emissions.

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