DUSHANBE, March 10, 2011, Asia-Plus -- One of rotary kilns at the Dushanbe cement plant has been shifted to coal, Muzaffar Hakimov, deputy director of the state unitary enterprise that operates the Dushanbe cement plant, told Asia-Plus Thursday afternoon.

According to him, specialists from Chinese company, Jun Hao (phonetically spelled), have helped install the coal-powered kiln.

In the meantime, representatives from Russian company, Sofo, jointly with their Tajik counterparts are currently conducting the environmental impact assessment for the coal-powered kiln.

“Upon completion of all assessments, the first coal-powered rotary kiln at the Dushanbe cement plant will operate in full capacity in six months,” Hakimov noted.

We will recall that the project for shifting of one the plant’s rotary kilns from natural gas to coal has been designed in cooperation with Chinese company, Jun Hao.  One kiln conversion comes to approximately 7 million somoni and all plant’s rotary kilns are expected to be shifted to coal gradually, during several years.

The Dushanbe cement plant has four large rotary kilns with capacity of 600 tons cement per year each and two small rotary kilns with capacity of 300 tons each.

Cement kilns are used for the pyroprocessing stage of manufacture of Portland and other types of hydraulic cement, in which calcium carbonate reacts with silica-bearing minerals to form a mixture of calcium silicates.  The cement kilns are the heart of the cement production process: their capacity usually defines the capacity of the cement plant.