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Installing an ultrasonic impedance densitometer at this critical process point of the bottom flow in the dissolution flash tank has had a revolutionary impact. It effectively solves the core problem of inaccurate measurements by traditional densitometers under these operating conditions, providing a reliable data foundation for the stabilization and optimization of the process. Its core application benefits are mainly reflected in the following two aspects: 1. Overcoming the problem of \"bubble interference\" to achieve accurate measurement. The flash tank is a key device for reducing pressure and temperature of the slurry after leaching; during this process, a large amount of secondary steam is generated instantly, causing the bottom-flowing slurry to be in a state of intense agitation with a mixture of gas, liquid, and solid phases. ①Traditional radiometric densitometers (such as Na22) operate on the principle of ray absorption. When rays pass through slurry containing a large number of bubbles, the density of gas is much lower than that of solids and liquids, resulting in reduced ray attenuation. The instrument misinterprets this as a decrease in density, leading to severely distorted measurement values that remain consistently low. This prevents operators from determining the true concentration of the bottom flow. ②Benefits of using an ultrasonic impedance densitometer: It performs measurements by utilizing the impedance properties of sound waves as they propagate through different media. Thanks to built-in intelligent algorithms such as linear frequency modulation analysis technology, it can effectively identify and filter out the acoustic signals generated by bubbles, calculating only the true density of the solid-liquid mixture. Even in harsh conditions with bubbling, it can still provide stable and accurate density data, completely solving the problem of artificially low measurement values. 2. Stable bottom flow control to ensure production safety and efficiency: Once accurate density data is available, precise control of the bottom flow in the flash tank becomes possible, resulting in a range of positive production benefits. ①Preventing pipeline blockages: By monitoring the bottom flow density in real time, it is possible to prevent blockages in the delivery pipelines caused by high concentrations and reduced fluidity, thus ensuring the continuous and stable operation of the dissolution unit. ②Eliminate the \"carry-over\" phenomenon: Precise control can prevent fine particles of red mud, which should settle, from entering subsequent processes due to excessively low bottom flow concentrations (i.e., \"carry-over\"). This not only affects the washing efficiency of red mud but also causes additional loss of alkali. ③Optimization of process parameters: Stable bottom flow control provides key parameters for optimizing the material balance and heat balance in the entire leaching-settling system, which helps to reduce steam and alkali consumption and improve overall production efficiency. 3. In summary, the use of ultrasonic density meters in the bottom flow of the leaching flash tank enables a shift from \"data distortion and reactive handling\" to \"accurate data and proactive control\", and it represents an important technical approach for ensuring the safe, stable, and efficient operation of the leaching system.