Steam jet pumps are used in the evaporation of alumina mother liquor
ShenZhen Jakeconn Precision Technology Co., Ltd. , https://www.jakeconn.com
Through in-depth research on the relationship between the saturated vapor pressure and saturation temperature of saturated sodium aluminate solution, this project developed an optimized process route aimed at enhancing the vacuum level in the flash system. This improvement increases the amount of water evaporated through crystallization and extends the primary crystallization cycle of the evaporated mother liquor. By carefully analyzing the performance characteristics of vacuum pumps, the project introduced an innovative combination of a ring vacuum pump and a steam jet pump, replacing the previous single-ring vacuum pump setup. This technology and equipment configuration was first applied in the alumina industry, marking a significant innovation.
By applying this advanced technology, the water vaporization capacity of the evaporator group was significantly improved, with a single evaporator group increasing its evaporation rate by 7.3 tons per hour. This achievement represents a leading domestic standard in the alumina industry.
In the application of the steam jet pump at Zhongzhou Branch within the mother liquor evaporation section, remarkable improvements were observed. The vacuum level increased from -0.07 MPa to -0.078 MPa, the final temperature dropped from 71°C to 65°C, and the concentration of the evaporator discharge rose from 237 g/L to 245.9 g/L. Additionally, the solid salt content in the liquor increased from 43.5 g/L to 56 g/L. These improvements have played a key role in maintaining alkali balance in the production process, strengthening sintering technology, and laying a solid foundation for reducing steam consumption in the evaporators.
To date, this achievement has been widely adopted in the evaporation process of mother liquor during the sintering process in many companies within China’s aluminum industry, as well as in joint production processes of alumina. It has generated nearly 2 million yuan in economic benefits, demonstrating both technical and commercial value.