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This study focused on the intelligent model for ore pulp density in the hydrometallurgical process. However, owing to the limitations of existing instruments and devices, the feed ore pulp density of thickener, a key hydrometallurgical equipment, cannot be accurately measured online. Therefore, aiming at the problem of accurately measuring the feed ore pulp density, we proposed a new intelligent model based on the long short-term memory (LSTM) and hybrid genetic algorithm (HGA). Specifically, the HGA refers to a novel optimization search algorithm model that can optimize the hyperparameters and improve the modeling performance of the LSTM. Finally, the proposed intelligent model was successfully applied to an actual thickener case in China. The intelligent model prediction results demonstrated that the hybrid model outperformed other models and satisfied the measurement accuracy requirements in the factory well. [ABSTRACT FROM AUTHOR]

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A high-strength pressure-resistant material and acid-resistant thickener are developed, and natural cores extracted from the Changqing Oilfield in China are wrapped in three dimensions to study the initiation, propagation, and characteristics of cracks. Conventional hydraulic fracturing, acid fluid fracturing, and thickener compound acid fluid fracturing were carried out through physical and numerical simulations. The results show that under the simulated environmental pressure, the fracture pressure in the core increases significantly. Ordinary hydraulic fracturing produces a fixed-direction fracture. The acid fluid effectively corroded the wellbore, thereby reducing the fracture pressure, but only some cracks were produced with pure acid pressure. Fracturing with the acid plus the thickener produced a single main fracture. The acidic fluid flowed in a fixed direction and effectively corroded the wellbore, thereby reducing the fracture pressure. A large number of microcracks are due to the thickener slowing down the acid nucleus reaction, which greatly increases the acid transmission distance. The shape of acid-etched cracks is significantly different from hydraulic fracturing because of the acid-rock reaction. Compared with other fracturing simulation studies, this study has the advantage of effectively reducing the initiation and propagation direction of fractures induced by acid fracturing in the presence of underground confining pressure. This experimental method restores the actual underground situation to the greatest extent. This paper combines physical simulation with numerical simulation to study acid erosion fracturing experiments, which provides guidance for optimizing the effect of acid fracturing. • Developed a simulation method and used large-scale 3D joint manufacturing equipment for physical simulation. • The large-scale three-dimensional physical simulation experiment of fracture creation has provided three sets to study the initiation and propagation direction of fractures. • A new type of high-strength coating cement-based material and a new type of acid and temperature resistant thickener are synthesized. • The combination of numerical and physical simulation experiments further verifies that the acid hydraulic cracking effect with thickener is the best. [ABSTRACT FROM AUTHOR]