Abstract: The lithium slag contains a certain amount of valuable metals,and desliming is an important way to obtain valuable metals from lithium slag.Based on the response surface method by the BoxBehnken Design (BBD),with the feed concentration,feed pressure and underflow port diameter of the hydrocyclone as the research objects,the influence of these three factors on the efficiency of lithium slag sludge removal and separation law was obtained,and a multivariate mathematical model for the separation quality efficiency was established.The accuracy of the mathematical model was verified through the analysis of variance on the experimental and simulated data,and the interaction between the parameters and the degree of influence on the separation quality efficiency were explored through the threedimensional surface graph.The results showed that the degree of influence of each factor on the separation quality efficiency is as follows:underflow orifice diameter,feed pressure and feed concentration,and the underflow orifice diameter has a strong interaction with the feed concentration.When the feed concentration is 10%,the feed pressure is 0.12 MPa,and the underflow orifice diameter is 8 mm,the separation quality efficiency of -20 μm particles can reach up to 67.37%,and the contents of -20 μm particles in the underflow is 5.67%,which is 28.6 percentage points lower than that in the feed.

Key words: lithium slag, desliming, response surface method, hydrocyclone, parameter optimization