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PRODUCTION TECHNOLOGY58 PRODUCTION TECHNOLOGY AAC WORLDWIDE %u2022 2.2025Shandong Dabo Pump Science and Technology Co., Ltd., Boshan District, Zibo, Shandong, ChinaSelection of AAC slurry transfer pumpsIn the AAC industry, slurry transportation mainly adopts equipment such as impeller pumps, pneumatic pumps, screw pumps, vane pumps and scrapers. The most common type is the impeller pump, which includes horizontal centrifugal pumps, vertical centrifugal pumps and trough pumps. Since trough pumps are only used at the discharge port of the mill in the raw material preparation section and are rarely applied in other scenarios, this article will mainly discuss horizontal centrifugal pumps and vertical centrifugal pumps, which are collectively referred to as slurry pumps.Yong Jiang, Deputy Secretary-General, China Aerated Concrete Association, ChinaTao Wei, General Manager, Shandong Dabo Pump Science and Technology Co., Ltd., ChinaSlurry pumps are commonly and very frequently used in the AAC industry. The proper selection of slurry pumps is not only related to the aspects of investment, energy consumption and production efficiency, but also to the maintenance load and overall performance of the production line. Therefore, slurry pumps are not only required to provide high investment efficiency and production efficiency, but also stable performance characteristics and high durability.Application scenarios for slurry pumpsSlurry pumps are mainly used in the mortar or fly ash slurry preparation section, slurry storage section, casting section, and cutting section. In addition, they are also commonly used for the condensate water and flushing water in the autoclave, since these contain a certain amount of solid siliceous powder. When the production line is scattered due to site restrictions, slurry pumps are used for long-distance connection.In the slurry storage section, when the slurry pump is equipped for the downward flow of the slurry storage tank, i.e. when the slurry storage tank is arranged above ground level, either a horizontal pump or a vertical pump can be used. When using a vertical pump, a transition tank needs to be set up, while the layout of a horizontal pump is relatively simple. Therefore, horizontal pumps are commonly used abroad (Fig. 2 b), while vertical pumps are mostly used in China (Fig. 2 a). Both types of pumps are applicable to the waste slurry tank at the bottom of the cutting machine. Since the waste slurry tank is positioned at a relatively deep level, it must be installed at the bottom elevation of the waste slurry tank, generally around - 6.000 m, if a horizontal pump is used. This poses a challenge to both construction projects and equipment maintenance. Some production lines still use horizontal pumps for transportation in the waste slurry tank under the cutting machine to match the overall functions of the unit (Fig. 3 b). However, in recent years, vertical pumps have increasingly been used for transportation (Fig. 3 a).For the casting section, the autoclave curing section, and the transportation of wastewater from flushing, the layout generally follows the form of the slurry preparation section. When it comes to long-distance transportation, the main considerations are the transportation distance and the head, and the layout can also refer to that of the slurry preparation section.Regardless of the work position where they are used, the application scenarios for slurry pumps in the AAC industry can be summarized into the following three categories: transportation in the raw material prepa-