Donaldson Membranes has again been awarded the order for 16000 m2 Tetratex ePTFE filter media for CBR, Lixhe, a subsidiary of Heidelberg Group in Belgium.

Donaldson Membranes’ expertise has ensured the renewal of a prestigious contract with Heidelberg Cement. The bags and services at the site including assembly were supplied by TTL-France, a subsidiary of Testori Group. Donaldson Membranes’ Tetratex ePTFE filter media was originally selected after discussion with the OEM, Redecam and the bag manufacturer Testori to meet the strict emissions requirements, the severe working conditions and the bag life expectations by Heidelberg.

Dust emission is currently below
Mark Rigby, Director of Donaldson Membranes said: ’We are delighted to have won this contract again.

"The excellent results and performance achieved by our filter media originally supplied at Lixhe together with our partners Testori/TTL-France have enabled us to renew this prestigious contract against severe competition.

"We look forward to working with Heidelberg Cement in its ongoing projects to increase production and meet environmental requirements".

In 2001, HeidelbergCement asked Donaldson Membranes for a filtration solution during modernisation works which involved shutting down the wet process kiln at its Lixhe plant and carrying out an overhaul of the dry process production line.

Two new fabric filters, manufactured by Redecam, were then installed to dedust kiln gases and the filter bag media selected was Donaldson Membranes’ number6255 Tetratex Ultra High Efficiency Woven Glass fabric.

The fabric filters house 7680 filter bags, each 4500mm long x 145mm diameter, giving a filter surface area of 15,730 m2.

Gas flow is a nominal 650,000Nm3/hr and operating temperature is 110˚C allowing for peaks up to 260˚C.

Before the overhaul the dry process production line had a capacity of 3400tpd of clinker.

Today the kiln is generally operating at a capacity of between 4400 and 4600tpd.