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LPP-Ts Save Time and Money in Aircrete Production

Celcon-owned H+H Siporex is a leading producer of aircrete in Northern Europe and the UK. The key raw materials of Autoclaved Areated Concrete (AAC) are lime and quartz sand. Incorporating a new operating principle, the robust LPP-T pumps have provided H+H Siporex with a perfect solution for their demanding and abrasive slurry duty.

Process Conditions
Specific Gravity	1.3 – 1.6
Solids Content	30 %
Temperature	40 – 60 °C
Medium	Abrasive

Together with furnace slurry, the raw materials of AAC are fed to a ball mill prior to being mixed together in reactors. From these reactors the abrasive slurry mixture is then pumped to a storage tank for further processing. The pumping of this slurry is a demanding task. Previously used and tested conventional hose and centrifugal pumps proved unsuccessful resulting in high maintenance costs, reduced maintenance intervals and frequent bin repair. Therefore the previously used pump was replced with LPP-T65 pump.

The LPP-T65 normally operates in this application from 20 to 22 hours per day with a pumping speed of 36 rpm and a flow rate of 11.5. m3/h at 3 bar pressure. The LPP-T65 pump is equipped with a 5.5. kW motor and a hose leak detector.

Following successful test results, H+H Siporex decided to include also another LPP pump (LPP-T40) in the process to replace the existing conventional hose pump for their mineral saw dust slurry pumping. In this part of the process, the aicrete elements are cut to the final dimension in a wire-cutting platform. The resulting scrap material drops to a mix tank below where the scrap particles are wetted, turned into a slurry and pumped back to a 27 meter high storage tank.

Operated with an inverter, the LPP-T40 pump is controlled with a level switch in the mix tank. The LPP-T40 empties this 3.5 m2 tank during the sawing process. The specific gravity of the saw dust slurry is between 1.3 – 1.6 and the process requires a flow of 4.5 m3/h.