Compound Hydrocyclone Carbide Slag Purification Method And CFD Simulation

Calcium carbide（CaC₂） is an important material for chemical production, produced by hydrolysis of carbide slag will seriously pollute the environment, China’s annual emissions carbide slag may reach 19 million tons, carbide slag treated is avery serious problem. Currently, the use of carbide slag produce lime as calcium carbide production materials are recognized as the best approach, but this method has a high demand of Ca（OH）₂ content requirements. In order to achieve carbide slag production of calcium carbide industry cycle, the Ca（OH）₂ purification links is crucial.The testing found that the content of Ca（OH）₂ in carbide slag is increases as the particle size decreasing. After the consideration, make the separating target particle size as 75μm, theoretically separated Ca（OH）₂ content can be achieved more than 92.4%, the recovery rate of carbide slag particles was 61.6%. According to the characteristics of the separation process and equipment, select the compound hydrocyclone to classify the carbide slag particles, to realize the purification of Ca（OH）₂.Based on the oil-liquid compound hydrocyclone, and according to the basic physical parameters of carbide slag particles, a new hydrocyclone suitable for fine particles classification and solid-liquid separation has been designed. Through the maximum tangential velocity locus method to establish mathematical model, and determined the shell structure parameters. By Fluent software build compound hydrocyclone flow field model, analyzed the influence of the rotating blade to the flow field, and make sure the design scheme.Make a test prototype, through quadratic orthogonal rotation combination test to verify the effect of compound hydrocyclone separation, determining themain factors to the separate indicators.The Optimizationoperating parameters: the feed speed 2.0m/s; the rotating blade speed 1921r/min; the feed concentration 24.2%. The separate indicators: cut size 58.4μm; separation efficiency 92%; treatment capacity 439.6Kg / h; separation accuracy coefficient 0.472; split ratio 0.707.Through the comparison with static hydrocyclone found that, under the best operating parameters, the flow field pressure of compound hydrocyclone is 6.5 times that of the static hydrocyclone, the tangential velocity is 3.3 times that of the static hydrocyclone, and having a large zero shaft speed envelope surface area. Thus, in the compound hydrocyclone, there are obvious advantages in the centrifugal force; the compensation of flow field energy and the separation efficiency. However, the compound hydrocyclone axial velocity and flow turbulent kinetic energy is larger, so the separation time and flow stability are relatively at a disadvantage.