the addis ababa pumice powder project ethiopia
in the highlands of ethiopia near the rapidly expanding capital city of addis ababa a unique industrial project is harnessing the regions abundant volcanic pumice to address a critical housing shortage. this is the addis ababa pumice powder project which features a robust european-style hammer mill stone powder grinding mill with a capacity of 8 tons per hour. the raw material is pumice a light porous volcanic rock that is plentiful in the rift valley region where ancient volcanic activity left behind vast deposits of this versatile mineral.
the pumice is quarried from open pits in the surrounding countryside and transported to the grinding facility on the outskirts of the city. the hammer mill is specifically designed for this relatively soft but abrasive material with special wear-resistant hammers and liners that can withstand the grinding action. the target fineness for this operation is 250 microns which is approximately 60 mesh. this relatively coarse specification is ideal for the production of lightweight concrete blocks which are becoming the material of choice for affordable housing projects across ethiopia.
the application of this pumice powder is transforming the construction industry in addis ababa. when mixed with cement and water the pumice powder creates a lightweight concrete block that is not only easier to handle and transport but also provides excellent thermal insulation properties a crucial advantage in the climate of the ethiopian highlands where temperatures can vary dramatically between day and night. these blocks reduce the need for air conditioning in summer and heating in winter making them both environmentally and economically beneficial.
the project faced significant challenges including irregular electricity supply which is common in this region of africa. the solution was to install a diesel-powered backup generator capable of running the entire grinding plant for extended periods during grid outages. additionally the mill was equipped with a heavy flywheel that stores kinetic energy helping to smooth out power fluctuations and maintain consistent grinding performance even when utility power is unstable. the 8 tons per hour capacity of this stone powder grinding mill now supplies dozens of small block-making enterprises across the city supporting the governments ambitious plan to build hundreds of thousands of new affordable homes for the growing population of ethiopias capital.
