Characterization And Experimental Study Of Top-blowing-mechanical Compound Stirring Mixing Uniformity In The Purification Process Of Hydrometallurgical Zinc Smeltin

The wet zinc refining and purification process is a very important process in zinc smelting.With the passage of time,it is becoming increasingly difficult to obtain zinc concentrates with high grades and low impurity content in the zinc smelting industry in China.On the contrary,it is becoming more and more common for heavy metals such as copper,cadmium,cobalt,germanium and lead to be associated with zinc.Therefore,in the process of wet zinc smelting,if the cadmium slag containing metallic elements cannot be used effectively in a timely manner,it will waste a lot of resources and cause serious ecological pollution,which has significant advantages in terms of environmental protection and economic benefits,and therefore has received extensive attention and research.Firstly,this paper builds a top-blowing-mechanical compound stirring experimental platform,adopts a Betti quantification algorithm,through its top-blowing-mechanical compound stirring process,and uses mathematical analysis software to image processing of the original image,the original image through grayscale transformation,high hat transformation,filter transformation,binarization,open operation,and finally obtains the image used to calculate the Betti number.Secondly,a logistic regression model for the homogeneity of gas-liquid two-phase mixing of top-blowing-mechanical composite stirring was established to evaluate the mixing effect by quantifying the integral area of Betti number,and the change of Betti number during the experiment was in accordance with the logistic regression model,and a new index for evaluating the homogeneity of gas-liquid two-phase mixing by fitting the slope k and intercept b to the logistic integral area was proposed Under different working conditions,the mixing time T was negatively correlated with the slope k,intercept b and integrated area S of the fitted line.The experimental results show that the mixing time is shortest at a hollow shaft motor speed of 100 rpm and a submergence depth of 12 cm in the top-blowing-mechanical compound mixing mode.Finally,based on the previous study,the reaction rate of the ion and zinc replacement system was controlled by diffusion through reaction kinetic analysis in the wet zinc purification experiments,and the top-blowing-mechanical compound stirring increased the diffusion rate,which could improve the electrochemical reaction rate and accelerate the wet zinc purification efficiency.The head-blowing-mechanical combined stirring technology can effectively improve the mixing efficiency and purification rate of the stirred reactor.