Numerical Simulation And Optimization Research Of Vanadium Shale Agitation Leaching Tank

Vanadium extracting from shale-type vanadium ore(known as stone coal) is animportant way to obtain vanadium products in China, and it is also an important aspectof resources’ comprehensive utilization. Leaching process is an important link of vextraction from coal stone, the leaching rate of vanadium played a decisive role to theutilization of vanadium and vanadium extracting production efficiency. Mechanicalagitation leaching tank is a kind of widely used vanadium leaching equipment. Thispaper based on the predecessors’ research, through the simulation of the two phasesflow field in the mechanical agitation leaching tank, the flow field in the stirred tank’sinfluence on the leaching rate of vanadium was analysised.Using GAMBIT to establish flow field physical model and the k-ε turbulencemodel, Euler-Euler multiphase flow model and multiple reference frame method toprocess the flow field, so as to simulate the flow field in the leaching tank for thevanaduim extraction from the stone coal in Fluent. We compared the flow field understraight blade, propeller and double blades, and the same equipped with baffle or drafttube and in the leaching tank. The main research results were as follows:The resultshows that, for the leaching tank with single blade, the mixing effect of the propellerimpeller is better under the same condition, the axial velocity is120%higher than thatof the straight impeller, and setting baffle and draft tube in the leaching tank is good forimproving the mixing flow field and strengthening the mixing effect, but the effect ofthe baffle is more significant. The baffle can weaken the tangential flow, so as toenhance the axial flow and radial flow. The shearing action to destroy solid membraneon the surface of the particles, so as to enhance the solid-liquid reaction to raise leachingrate.The shearing action accompanied by can destroy the solid membrane on the surfaceof the particles, so as to enhance the solid-liquid reaction to raise leaching rate.For theleaching tank with double blades, the mixing effect of the double blade rotate indifferent directions is better under the same condition, the distribution of the turbulentkinetic energy under the double blade rotate in different directions is more uniform andreasonable, and can ease the sediment at the bottom.Guided by the simulation results, according to the requirements of shale- type vanadium ore leaching process, the continuous agitation leaching equipment whichcan realize constant temperature constant pH control was designed and relatedexperiments were did.The research results have certain reference value for the researchof the law of the internal flow field so as to optimize its structure in the stirred reactionvessel.