Alumina Refinery Pump

Aluminium oxide slurry is a very demanding liquid as it contains heavy concentration abrasive particles. Slurry pump is the main equipment for handling slurry in alumina technological process. Its normal operation is the guarantee for the steady increase of alumina output. At present, the domestic slurry pumps are very popular in the application of alumina process, the adaptability of the products will be limited to some degrees. For example: the service life of the pump wet parts, the sealing effection of the pump shaft seal, and the standardization of pump accessories. 

Main pump positions and selection points in alumina production.

1) Raw pulp preparation process

Main pump positions: mud pump, pulp pump, alkali liquor pump, slag slurry sewage pump, evaporation mother liquor pump, lime milk pump, etc.

Key points of type selection: high pulp concentration, high solid content and high density; Large particle size and high hardness; It is recommended to control the selected speed below 730rpm and adopt frequency conversion regulation.

2) Pressure boiling digestion process

Main pump positions: raw slurry pump, diluted slurry pump, discharge pump, red mud washing pump, slurry sewage pump, condensate pump, circulating pump, sewage pump, etc.

Key points of type selection: the concentration, solid content and density are lower than those of the original pulp preparation process. It is recommended to control the speed of type selection below 980rpm and adopt frequency conversion regulation.

3) Dilution of dissolved pulp and separation and washing of red mud

Main pump positions: underflow pump, feed pump, sewage pump, crude liquid pump, semen pump, overflow pump, etc.

Key points of type selection: most of the slurry in this section contains flocculant, with high viscosity and stuttering. It is recommended to control the selected speed below 980rpm and adopt frequency conversion regulation.

4) Seed decomposition process

Main pump positions: seed pump, heat exchanger feed pump, intermediate cooling pump, cooling water pump, underflow pump of prototype mother liquor tank, circulating pump, mother liquor pump, sewage pump, etc.

Key points of type selection: the slurry stutters. It is recommended to control the speed of type selection below 980rpm and adopt frequency conversion regulation.

5) Mother liquor evaporation and soda causticization process

Main pump positions: feed pump, mother liquor pump, underflow pump, circulating pump, condensate pump, lime milk pump, forced circulation pump, sewage pump, etc.

Key points of type selection: AH slurry of evaporation system has stutter, and slurry temperature and pH value are high. It is recommended to control the selected speed below 1480rpm and adopt frequency conversion regulation.