System and method for regulating aluminum precipitation during high-pressure acid leaching of laterite nickel ore

A system for regulating aluminum precipitation during high-pressure acid leaching of laterite nickel ore, comprising:

• an autoclave, which comprises a kettle body, a first feeding pipe, a second feeding pipe, and a discharge pipe, wherein the kettle body is equipped with material inlets for adding materials;
• wherein the first feeding pipe and the second feeding pipe are respectively connected to an interior of the kettle body, and are capable of adding a promoter that enhances the hydrolysis and precipitation of aluminum elements and an inhibitor that suppresses the hydrolysis and precipitation of aluminum elements into the kettle body;
• the discharge pipe is connected to the kettle body and is capable of discharging reactants within the kettle body;
• a subsequent processing equipment comprising a flash evaporation mechanism and a leachate storage tank, wherein the subsequent processing equipment is connected to the discharge pipe and is capable of processing the reactants;
• and,
• a control device, which comprises a first valve, a second valve, a first pressure sensor, a second pressure sensor, an aluminum ion detection device, and a control unit;
• wherein the first valve is installed on the first feeding pipe, and the second valve is installed on the second feeding pipe;
• wherein the first pressure sensor is located inside an end of the discharge pipe connected to the kettle body, while the second pressure sensor is located inside an end of the discharge pipe connected to the subsequent processing equipment;
• wherein the aluminum ion detection device is connected to the subsequent processing equipment and is capable of detecting a concentration of aluminum ions within the subsequent processing equipment;
• wherein the control unit is connected to the first valve, the second valve, the first pressure sensor, the second pressure sensor, and the aluminum ion detection device;
• the control unit receives detection results from the first pressure sensor, the second pressure sensor, and the aluminum ion detection device, and determines a flow rate of the promoter or inhibitor based on the comparison between the pressure difference between the first pressure sensor and the second pressure sensor and a first preset range, as well as the comparison between the aluminum ion concentration and a second preset range;
• wherein if the pressure difference between the first pressure sensor and the second pressure sensor exceeds the first preset range, the control unit increases the flow rate of the inhibitor, and wherein if the aluminum ion concentration exceeds the second preset range, the control unit increases the flow rate of the promoter or inhibitor until the aluminum ion concentration falls within the second preset range.